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F/B not to bad easy build

7K views 50 replies 6 participants last post by  wildwillie 
#1 · (Edited)
if you can get 1/4 copper tubing , 6- Ts , 4- 90 elbows
some 2x4 wire mesh
not to bad of antenna

Code:
CM Quadruple Quad,    wildwillie  march 20 2018
CM if you what to rescale (Frequance in feet /4 ) x12
CM A justing the wire mesh width of 2x4 will only reduce F/B and bring up gain a little
CM think out of the box if you want more gain "what if" lol
CM SWR seems not to bad
CE
GW	1	3	0	0.6	0	0	-0.9	0	0.05094856
GW	2	9	0	-2.88	5.4375	0	2.5575	5.4375	0.05094856
GW	3	9	0	-2.88	5.4375	0	-2.88	0	0.05094856
GW	4	9	0	-2.88	10.875	0	-2.88	5.4375	0.05094856
GW	5	9	0	-2.88	0	0	-2.88	-5.438	0.05094856
GW	6	9	0	-2.88	10.875	0	2.5575	10.875	0.05094856
GW	7	9	0	-2.88	-5.438	0	2.5575	-5.438	0.05094856
GW	8	9	0	-2.88	-5.438	0	-2.88	-10.88	0.05094856
GW	9	9	0	-2.88	-10.88	0	2.5575	-10.88	0.05094856
GW	10	9	0	2.5575	-5.438	0	2.5575	-10.88	0.05094856
GW	11	9	0	2.5575	3.e-15	0	2.5575	-5.438	0.05094856
GW	12	9	0	2.5575	5.4375	0	2.5575	3.e-15	0.05094856
GW	13	9	0	2.5575	10.875	0	2.5575	5.4375	0.05094856
GW	14	3	0	0.6	0	0	2.5575	3.e-15	0.05094856
GW	15	3	0	-0.9	0	0	-2.88	0	0.05094856
GW	17	7	-5.5	-8	10	-5.5	-4	10	0.05094856
GW	18	3	-5.5	-4	10	-5.5	-4	12	0.05094856
GW	19	7	-5.5	-4	12	-5.5	-8	12	0.05094856
GW	20	7	-5.5	-4	12	-5.5	0	12	0.05094856
GW	21	3	-5.5	0	12	-5.5	0	10	0.05094856
GW	22	7	-5.5	0	10	-5.5	-4	10	0.05094856
GW	23	7	-5.5	0	12	-5.5	4	12	0.05094856
GW	24	3	-5.5	4	12	-5.5	4	10	0.05094856
GW	25	7	-5.5	4	10	-5.5	0	10	0.05094856
GW	26	7	-5.5	4	10	-5.5	8	10	0.05094856
GW	28	7	-5.5	8	12	-5.5	4	12	0.05094856
GW	30	7	-5.5	-8	8	-5.5	-4	8	0.05094856
GW	31	3	-5.5	-4	8	-5.5	-4	10	0.05094856
GW	34	3	-5.5	0	10	-5.5	0	8	0.05094856
GW	35	7	-5.5	0	8	-5.5	-4	8	0.05094856
GW	37	3	-5.5	4	10	-5.5	4	8	0.05094856
GW	38	7	-5.5	4	8	-5.5	0	8	0.05094856
GW	39	7	-5.5	4	8	-5.5	8	8	0.05094856
GW	42	7	-5.5	-8	6	-5.5	-4	6	0.05094856
GW	43	3	-5.5	-4	6	-5.5	-4	8	0.05094856
GW	44	3	-5.5	0	8	-5.5	0	6	0.05094856
GW	45	7	-5.5	0	6	-5.5	-4	6	0.05094856
GW	46	3	-5.5	4	8	-5.5	4	6	0.05094856
GW	47	7	-5.5	4	6	-5.5	0	6	0.05094856
GW	48	7	-5.5	4	6	-5.5	8	6	0.05094856
GW	51	7	-5.5	-8	4	-5.5	-4	4	0.05094856
GW	52	3	-5.5	-4	4	-5.5	-4	6	0.05094856
GW	53	3	-5.5	0	6	-5.5	0	4	0.05094856
GW	54	7	-5.5	0	4	-5.5	-4	4	0.05094856
GW	55	3	-5.5	4	6	-5.5	4	4	0.05094856
GW	56	7	-5.5	4	4	-5.5	0	4	0.05094856
GW	57	7	-5.5	4	4	-5.5	8	4	0.05094856
GW	60	7	-5.5	-8	2	-5.5	-4	2	0.05094856
GW	61	3	-5.5	-4	2	-5.5	-4	4	0.05094856
GW	62	3	-5.5	0	4	-5.5	0	2	0.05094856
GW	63	7	-5.5	0	2	-5.5	-4	2	0.05094856
GW	64	3	-5.5	4	4	-5.5	4	2	0.05094856
GW	65	7	-5.5	4	2	-5.5	0	2	0.05094856
GW	66	7	-5.5	4	2	-5.5	8	2	0.05094856
GW	69	7	-5.5	-8	-5.464e-15	-5.5	-4	-5.464e-15	0.05094856
GW	70	3	-5.5	-4	-5.464e-15	-5.5	-4	2	0.05094856
GW	71	3	-5.5	0	2	-5.5	0	-5.464e-15	0.05094856
GW	72	7	-5.5	0	-5.464e-15	-5.5	-4	-5.464e-15	0.05094856
GW	73	3	-5.5	4	2	-5.5	4	-5.464e-15	0.05094856
GW	74	7	-5.5	4	-5.464e-15	-5.5	0	-5.464e-15	0.05094856
GW	75	7	-5.5	4	-5.464e-15	-5.5	8	-5.464e-15	0.05094856
GW	78	7	-5.5	-8	-2	-5.5	-4	-2	0.05094856
GW	79	3	-5.5	-4	-2	-5.5	-4	-5.464e-15	0.05094856
GW	80	3	-5.5	0	-5.464e-15	-5.5	0	-2	0.05094856
GW	81	7	-5.5	0	-2	-5.5	-4	-2	0.05094856
GW	82	3	-5.5	4	-5.464e-15	-5.5	4	-2	0.05094856
GW	83	7	-5.5	4	-2	-5.5	0	-2	0.05094856
GW	84	7	-5.5	4	-2	-5.5	8	-2	0.05094856
GW	87	7	-5.5	-8	-4	-5.5	-4	-4	0.05094856
GW	88	3	-5.5	-4	-4	-5.5	-4	-2	0.05094856
GW	89	3	-5.5	0	-2	-5.5	0	-4	0.05094856
GW	90	7	-5.5	0	-4	-5.5	-4	-4	0.05094856
GW	91	3	-5.5	4	-2	-5.5	4	-4	0.05094856
GW	92	7	-5.5	4	-4	-5.5	0	-4	0.05094856
GW	93	7	-5.5	4	-4	-5.5	8	-4	0.05094856
GW	96	7	-5.5	-8	-6	-5.5	-4	-6	0.05094856
GW	97	3	-5.5	-4	-6	-5.5	-4	-4	0.05094856
GW	98	3	-5.5	0	-4	-5.5	0	-6	0.05094856
GW	99	7	-5.5	0	-6	-5.5	-4	-6	0.05094856
GW	100	3	-5.5	4	-4	-5.5	4	-6	0.05094856
GW	101	7	-5.5	4	-6	-5.5	0	-6	0.05094856
GW	102	7	-5.5	4	-6	-5.5	8	-6	0.05094856
GW	105	7	-5.5	-8	-8	-5.5	-4	-8	0.05094856
GW	106	3	-5.5	-4	-8	-5.5	-4	-6	0.05094856
GW	107	3	-5.5	0	-6	-5.5	0	-8	0.05094856
GW	108	7	-5.5	0	-8	-5.5	-4	-8	0.05094856
GW	109	3	-5.5	4	-6	-5.5	4	-8	0.05094856
GW	110	7	-5.5	4	-8	-5.5	0	-8	0.05094856
GW	111	7	-5.5	4	-8	-5.5	8	-8	0.05094856
GW	114	7	-5.5	-8	-10	-5.5	-4	-10	0.05094856
GW	115	3	-5.5	-4	-10	-5.5	-4	-8	0.05094856
GW	116	3	-5.5	0	-8	-5.5	0	-10	0.05094856
GW	117	7	-5.5	0	-10	-5.5	-4	-10	0.05094856
GW	118	3	-5.5	4	-8	-5.5	4	-10	0.05094856
GW	119	7	-5.5	4	-10	-5.5	0	-10	0.05094856
GW	120	7	-5.5	4	-10	-5.5	8	-10	0.05094856
GW	123	7	-5.5	-8	-12	-5.5	-4	-12	0.05094856
GW	124	3	-5.5	-4	-12	-5.5	-4	-10	0.05094856
GW	125	3	-5.5	0	-10	-5.5	0	-12	0.05094856
GW	126	7	-5.5	0	-12	-5.5	-4	-12	0.05094856
GW	127	3	-5.5	4	-10	-5.5	4	-12	0.05094856
GW	128	7	-5.5	4	-12	-5.5	0	-12	0.05094856
GW	129	7	-5.5	4	-12	-5.5	8	-12	0.05094856
GW	204	3	-5.5	8	10	-5.5	8	12	0.05094856
GW	205	3	-5.5	8	8	-5.5	8	10	0.05094856
GW	206	3	-5.5	8	6	-5.5	8	8	0.05094856
GW	207	3	-5.5	8	4	-5.5	8	6	0.05094856
GW	208	3	-5.5	8	2	-5.5	8	4	0.05094856
GW	209	3	-5.5	8	-5.464e-15	-5.5	8	2	0.05094856
GW	210	3	-5.5	8	-2	-5.5	8	-5.464e-15	0.05094856
GW	211	3	-5.5	8	-4	-5.5	8	-2	0.05094856
GW	212	3	-5.5	8	-6	-5.5	8	-4	0.05094856
GW	213	3	-5.5	8	-8	-5.5	8	-6	0.05094856
GW	214	3	-5.5	8	-10	-5.5	8	-8	0.05094856
GW	215	3	-5.5	8	-12	-5.5	8	-10	0.05094856
GW	216	3	-5.5	-8	10	-5.5	-8	12	0.05094856
GW	217	3	-5.5	-8	8	-5.5	-8	10	0.05094856
GW	218	3	-5.5	-8	6	-5.5	-8	8	0.05094856
GW	219	3	-5.5	-8	4	-5.5	-8	6	0.05094856
GW	220	3	-5.5	-8	2	-5.5	-8	4	0.05094856
GW	221	3	-5.5	-8	-5.464e-15	-5.5	-8	2	0.05094856
GW	222	3	-5.5	-8	-2	-5.5	-8	-5.464e-15	0.05094856
GW	223	3	-5.5	-8	-4	-5.5	-8	-2	0.05094856
GW	224	3	-5.5	-8	-6	-5.5	-8	-4	0.05094856
GW	225	3	-5.5	-8	-8	-5.5	-8	-6	0.05094856
GW	226	3	-5.5	-8	-10	-5.5	-8	-8	0.05094856
GW	227	3	-5.5	-8	-12	-5.5	-8	-10	0.05094856
GS	0	0	0.0254		' All in in.
GE	0
EK
LD	5	0	0	0	5.8e7	0
EX	0	1	2	0	1	0
GN	-1
FR	0	1	0	0	500	0
 
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1
#3 · (Edited)
UHF_Quadruple_Quad_16x24_ScnGrid=2x4 by WildWillie

About 10 dBi Gain from 470-662 MHz...with notable Gain Roll-off to 7.8 dBi at 698 MHz...with good SWR and F/R=14.2-16.3 dB...very high F/R [directly opposite main beam]. High Freq Roll-off could be reduced to ~ 8.6 dBi, with slightly higher SWR on 470 MHz, by shifting Gain Curve by ~12 MHz [F = 0.982 Re-Scale].

EVAL RESULTS:

Code:
Input file : Z:\4nec2_PLUS\U\U - Quad-Quad - WW\
UHF_Quadruple_Quad_16x24_ScnGrid=2x4_WW.nec
Freq sweeps: [(278, 12, 61)]
Autosegmentation: NO

         --- Gain ---              -- Ratios -- -- Impedance --
   Freq    Raw    Net   SWR BeamW    F/R    F/B    Real    Imag  AGT  corr
==========================================================================
  350.0   9.41   1.22 24.31  70.7  14.81  14.81 3991.30-3624.71 1.00 -0.00
  362.0   9.49   2.58 17.57  71.0  16.30  16.30 1376.44-2301.26 1.00 -0.00
  374.0   9.57   3.82 12.95  71.1  17.86  17.86  775.70-1530.02 1.00 -0.00
  386.0   9.63   4.92  9.74  71.4  19.45  19.50  550.66-1110.43 1.00 -0.00
  398.0   9.69   5.88  7.48  71.5  18.80  21.33  442.12 -850.84 1.00  0.01
  410.0   9.75   6.73  5.86  71.8  18.22  23.43  381.91 -674.43 1.00  0.01
  422.0   9.80   7.44  4.68  72.0  17.70  25.98  345.53 -546.08 1.00  0.01
  434.0   9.84   8.03  3.81  72.2  17.23  29.26  322.33 -447.39 1.00  0.01
  446.0   9.84   8.49  3.15  72.4  16.77  32.76  307.50 -367.43 1.00  0.01
  458.0   9.83   8.86  2.61  72.4  16.42  32.83  299.72 -299.46 1.00  0.00

  470.0   9.78   9.13  2.19  72.4  16.26  30.42  299.64 -240.75 1.00  0.00
  482.0   9.75   9.33  1.86  72.3  16.22  29.21  306.65 -191.85 1.00  0.00
  494.0   9.77   9.50  1.64  72.3  16.20  29.35  317.88 -152.94 1.00  0.00
  506.0   9.83   9.66  1.49  72.3  16.12  30.36  330.75 -122.37 1.00  0.00
  518.0   9.89   9.77  1.40  72.4  15.97  31.89  344.22  -98.21 1.00  0.01
  530.0   9.96   9.86  1.35  72.6  15.78  33.71  358.12  -79.18 1.00  0.01
  542.0  10.04   9.95  1.34  72.7  15.58  35.62  372.47  -64.66 1.00  0.01
  554.0  10.11  10.01  1.35  72.9  15.37  37.25  387.19  -54.49 1.00  0.01
  566.0  10.17  10.06  1.38  73.1  15.17  38.08  402.04  -48.79 1.00  0.01
  578.0  10.25  10.12  1.43  73.3  14.98  37.93  416.51  -47.86 1.00 -0.01
  590.0  10.30  10.14  1.47  73.4  14.78  37.16  429.70  -52.09 1.00 -0.01
  602.0  10.32  10.13  1.52  73.6  14.58  36.21  440.19  -61.79 1.00 -0.01
  614.0  10.32  10.11  1.56  73.7  14.41  35.34  445.91  -76.78 1.00 -0.01
  626.0  10.28  10.04  1.60  73.7  14.26  34.60  444.28  -95.82 1.00 -0.01
  638.0  10.22   9.97  1.62  73.8  14.13  33.91  432.88 -116.01 0.98 -0.07
  650.0  10.02   9.77  1.63  73.6  14.04  33.15  410.84 -132.69 0.98 -0.07
  662.0   9.69   9.45  1.61  73.3  13.99  32.08  380.17 -140.69 0.98 -0.07
  674.0   9.21   9.00  1.56  73.0  14.00  30.50  345.83 -136.68 0.98 -0.07
  686.0   8.56   8.39  1.48  72.5  14.06  28.38  313.65 -120.82 0.98 -0.07
  698.0   7.82   7.70  1.39  71.9  14.21  25.99  287.82  -96.17 0.98 -0.09

  710.0   7.00   6.93  1.29  71.3  14.35  23.59  269.87  -66.73 0.98 -0.09
  722.0   6.23   6.19  1.21  70.6  14.45  21.40  259.29  -35.77 0.98 -0.09
  734.0   5.59   5.56  1.18  70.0  14.39  19.52  254.63   -5.25 0.98 -0.09
  746.0   5.12   5.08  1.20  69.0  14.11  17.96  254.36   23.96 0.98 -0.09
  758.0   4.76   4.70  1.27  68.8  13.75  16.65  257.21   51.61 0.99 -0.05
  770.0   4.54   4.44  1.36  68.8  13.30  15.49  262.05   78.05 0.99 -0.05
  782.0   4.39   4.23  1.46  69.6  12.93  14.47  268.45  104.20 0.99 -0.05
  794.0   4.27   4.05  1.58  71.1  12.50  13.65  277.17  130.39 0.99 -0.05
  806.0   4.13   3.83  1.69  72.2  11.91  12.90  287.88  155.90 0.99 -0.05
 
#4 ·
UHF_Quadruple_Quad_16x24_ScnGrid=1x2 Mod

What if change from 2"Hx4"W to 1"Hx2"W Grid Size??? NOT MUCH....

Negligible change to Gain and minor changes to SWR. Still see notable Gain Roll-off to 7.5 dBi at 698 MHz...with good SWR and about 1 dB increase in F/R...but significant reduction in F/R [directly opposite main beam]. And can no longer change High Freq Roll-off via Re-Scale due to slight increase in SWR on Low Freqs.

EVAL RESULTS:

Code:
  350.0   9.43   0.83 26.93  70.0  12.09  12.09 3987.94-4033.60 1.00 -0.01
  362.0   9.52   2.24 19.32  70.3  13.12  13.12 1281.39-2390.77 1.00 -0.01
  374.0   9.60   3.53 14.09  70.5  14.13  14.13  710.73-1556.68 1.00 -0.01
  386.0   9.68   4.71 10.44  70.7  15.13  15.13  503.12-1116.74 1.00 -0.01
  398.0   9.73   5.75  7.88  70.9  16.13  16.13  405.15 -847.68 1.00  0.01
  410.0   9.80   6.67  6.05  71.1  17.14  17.14  352.36 -665.77 1.00  0.01
  422.0   9.86   7.46  4.75  71.3  18.16  18.16  321.98 -533.89 1.00  0.01
  434.0   9.92   8.12  3.79  71.4  19.06  19.19  304.20 -433.21 1.00  0.01
  446.0   9.97   8.66  3.09  71.5  18.59  20.16  294.20 -353.06 1.00  0.01
  458.0  10.00   9.07  2.56  71.6  18.18  20.93  289.64 -286.81 1.00  0.01

  470.0  10.01   9.39  2.14  71.7  17.85  21.30  289.70 -230.21 1.00  0.01
  482.0  10.01   9.62  1.82  71.8  17.64  21.22  294.49 -180.98 1.00  0.01
  494.0  10.01   9.79  1.58  71.7  17.52  20.91  304.12 -138.47 1.00  0.01
  506.0  10.03   9.91  1.40  71.7  17.45  20.66  317.99 -102.78 1.00  0.01
  518.0  10.07  10.00  1.29  71.6  17.39  20.56  335.01  -73.89 1.00  0.01
  530.0  10.12  10.07  1.26  71.7  17.30  20.58  354.18  -51.45 1.00  0.01
  542.0  10.18  10.12  1.28  71.8  17.17  20.69  374.80  -35.14 1.00  0.01
  554.0  10.25  10.16  1.33  71.8  17.02  20.83  396.36  -24.88 1.00  0.01
  566.0  10.31  10.19  1.40  72.0  16.84  20.94  418.25  -20.92 1.00  0.01
  578.0  10.40  10.23  1.47  72.1  16.66  21.02  439.52  -23.77 1.00 -0.02
  590.0  10.45  10.24  1.54  72.2  16.48  21.02  458.64  -34.01 1.00 -0.02
  602.0  10.48  10.23  1.61  72.3  16.32  20.93  473.25  -51.90 1.00 -0.02
  614.0  10.47  10.19  1.67  72.4  16.15  20.73  480.08  -76.75 1.00 -0.02
  626.0  10.42  10.11  1.71  72.4  16.01  20.41  475.50 -105.91 1.00 -0.02
  638.0  10.35  10.02  1.73  72.4  15.88  19.94  456.91 -134.24 0.98 -0.08
  650.0  10.10   9.77  1.73  72.4  15.78  19.32  424.87 -154.77 0.98 -0.08
  662.0   9.71   9.41  1.70  72.2  15.74  18.56  384.29 -161.43 0.98 -0.08
  674.0   9.13   8.87  1.63  71.8  15.77  17.66  342.87 -152.12 0.98 -0.08
  686.0   8.37   8.17  1.53  71.2  15.92  16.67  307.50 -129.43 0.98 -0.08
  698.0   7.47   7.34  1.41  70.5  15.64  15.64  281.83  -98.51 0.98 -0.09

  710.0   6.53   6.45  1.29  69.8  14.70  14.70  266.14  -64.32 0.98 -0.09
  722.0   5.71   5.67  1.20  68.7  13.95  13.95  258.88  -30.26 0.98 -0.09
  734.0   5.11   5.08  1.16  67.6  13.44  13.44  257.93    1.97 0.98 -0.09
  746.0   4.76   4.72  1.19  67.7  13.18  13.18  261.51   31.64 0.98 -0.09
  758.0   4.58   4.52  1.27  67.7  13.10  13.10  268.08   58.84 0.99 -0.04
  770.0   4.57   4.47  1.35  68.0  13.08  13.08  276.69   83.96 0.99 -0.04
  782.0   4.61   4.46  1.44  68.6  13.06  13.06  286.74  107.44 0.99 -0.04
  794.0   4.67   4.47  1.54  69.1  12.99  12.99  297.90  129.81 0.99 -0.04
  806.0   4.71   4.44  1.64  69.5  12.84  12.84  309.99  151.53 0.99 -0.04
 
#5 · (Edited)
holl_ands on the 2"Hx4"W wire mesh as seen on some wifi antennas ,
I added another 2"Hx4"W 90 degree bend section on top and bottom
I lost some of the F/B ( have to readjust mesh spacing from elements to find sweat spot of better F/B)
brot up higher band near 698 end
I'm in the process of finding the sweat spot.
should beable to keep ohms near the 300 mark as it jumps up in the mid band just a little over 400 ( with some gain increase )

holl_ands RR material should be 16 W X 32 H or higher

holl_ands when you rescale you have to rescale RR mesh also . or try RR rods one behind each element. there is a sweat spot for them in length , your back spacing should be the distance of one element length or close to it , that's the starting point for RR material

RR material plays big part in swr and F/B

have to look at the VHF Hi to see were a good rescale factor would be for a good 10db across the band , I'm thinking of starting down in the 130mhz
 
#9 ·
well holl_ands I decided to stack the antenna for a 12 to 13 db its running on the computer now
phase lines 1 inch out front
same feed gap 1.5 inches
spacing between the stacks 0.50 inches and it likes it.
AGT test at
470 12.5 db
632 13.4 db
698 10.5 db

the vertical beam is shrinking
horizontal is getting wider, 698 its really wide

I will figure this puppy out lol
 
#10 · (Edited)
UHF Quadazoid Loop - No Refl

I immediately recognized that WildWillie's "Quad-Quad" [with all Dimensions Matchy-Matchy and NO GAPS other than the Feedpoint] had the SAME TOPOLOGY as the "Quad-Trap-Loop", except the latter has small GAPs at the Top and Bottom with OPTimized Free-Form Dimensions:
https://imageevent.com/holl_ands/loops/uhfquadtrapezoidloop
I also recognized that by adding a small GAP at the Top and Bottom of the "Twin-Loop" (aka Figure-8), the resultant "Chireix Loop" had significantly higher Gain....so I was curious to see whether or not the QTL outperformed a FREE-FORM "Quad-Quad"....which I have nicknamed the "Quadazoid-Loop (QZL)":
https://imageevent.com/holl_ands/loops

Hence, I decided to modify my FREE-FORM "Quad-Trap-Loop" Model with two more wires to close the Top and Bottom GAPs and ran it through nikiml's Optimizer to find the OPTimized Dimensions, resulting in the fol. 4nec2 Analysis of the "Quadazoid-Loop" [aka Gap-less Quadruple Trapezoid Loop]:
https://imageevent.com/holl_ands/loops/uhfquadazoidloopnorefl

UHF Raw Gain = 6.3 to 7.4 to 6.2 dBi & SWR (300-ohms) Under 1.7....a bit LESS than QTL.
UHF Beamwidth = 82 to 72 degrees, Bi-Directional, decreasing with Freq, TIED with TWIN-LOOP.



So Quadazoid without Reflector falls in the middle of the pack wrt Gain:




 
#11 · (Edited)
UHF Quadazoid Loop + Reflector
Screen Grid Reflector = 24"H x 16"W with Grid = 2"H x 4"W:

I then added the SAME Reflector used by WildWillie in above Post#1 and RE-Optimized the "Quadazoid-Loop" Dimensions:
https://imageevent.com/holl_ands/loops/uhfquadazoidlooprefl

Note that OPTimized Dimensions WITH Reflector are somewhat DIFFERENT than without.
Most of this is due to the High Standard Deviation (Y2 Sigma = 0.87-in) in the Length
of the [8.37"] Horizontal Wire. [REDACTED: My comment re. Y2...it was an extraneous SYmbol problem...corrected Typo in 4nec2 File.]

UHF Raw Gain = 9.8 to 10.4 to 9.8 dBi, F/B & F/R Gain Min. = 14.1 dB
and SWR (300-ohms) Under 1.3...with Beamwidth ~ 70-deg.
So performance is very comparable to A-D C2, sacrificing High Gain in
order to provide a VERY WIDE BEAMWIDTH Azimuthal Pattern.






 
#12 ·
You want to see that gain jump holl_ands
Add two 4 inch long 2x4 above and below to that reflector system , and ajust element spacing
Should run you up to the 750 MHz close to 9 db
470 to around 530 should hold 10 db
Then should raise to over 11 db then back down to around 10db at 698
F/b should drop at 470 and start to raise again mid band , stay stable then drop at 698
Well swr holds and you got a nice swr there sir
I'm just taking a wild what if , just looking at your data , that the above two pieces added to your RR system
Set element back one and half inches back from new RR ad on front opening of the new [
H Beam width should also widen and V beam width shrink

These types of antennas seem to love the top bottom coverage longer the better so far

I haven't even looked at your nec yet
 
#15 · (Edited)
Re. Antennas with Very High F/B [narrow angle directly opposite Forward Beam]
and [More Importantly] Very High F/R [Worst Case for entire Rear Hemisphere]:


Since Interference and Multipath can be coming from ANY Direction, an Antenna with a High F/R is MUCH more useful than one that has a Deep Null directly towards the Rear but with significant Lobes towards other directions....and hence a much higher F/B Ratio....which is why my Performance Summaries cite the Minimum F/B Ratio. And I am NOT all that impressed by Very High F/R Ratio numbers....sure, you COULD use a Rotator to steer a Deep Rear Null towards a (single) source of Interference, but then it is very likely that there would be much less Gain toward the Desired Direction(s)....

Designing an Antenna with good Rear Cancellation is MUCH easier when trying to cover a Narrow Bandwidth (e.g. 2-m Band). I suspect, but have NOT yet determined whether the 2-m M-Quad Gain claim is an inflated number due to assuming a Mounting Height above a Ground Plane [vice usual Free Space]...as is implied in the fol. article:
https://www.google.com/url?sa=t&rct...0ARTICLE.pdf&usg=AOvVaw39fyOd8LjDmVgiEKVE7KwZ

FYI: Although I wasn't TRYING to design an Antenna with a Very High F/B Ratio, the fol. Ch22 9-El FLF-Yagi [Flat Folded Loop] provided a 6 MHz Wide F/B Min = 40.2 dB....whereas for Full UHF Band Yagi's it takes many Directors and a Corner Reflector to barely reach F/B Min ~ 30 dB [although, again, I wasn't going out of my way to INTENTIONALLY Design a Very High F/B Antenna at the expense of some Forward Gain]:
https://imageevent.com/holl_ands/yagis/ch229flfyagi300ohm
https://imageevent.com/holl_ands/yagis

For a Full Band UHF Antenna, it took far fewer LPDA Element Pairs to provide F/B Min ~ 20 dB than Elements in a Yagi...but ONLY when using an OPTIMIZER....K7MEM and LPCAD** programs were well off the mark:
https://imageevent.com/holl_ands/zigzaglpa/uhflpda

Going the next step and using a FREE FORM FLAT LPDA design reached F/B = 24.5 dB with only 7-El Pairs:
https://imageevent.com/holl_ands/zigzaglpa/uhflpda/uhf7elflatlpdaopt

I also analyzed simple Twin-Boom Sigma-Tau LPDA Designs for (nearly) all number of ODD Element Pairs from 3 thru 23. With 7-El Pairs, F/B Min = 20 to 25 dB, for Element/Boom thickness between AWG10 and 1/4-in O.D. And with 11-El Pairs, F/B Min = 28 to 32 dB....approaching a LIMIT of about 40-45 dB for a MUCH LARGER Number of Element Pairs. Downloadable Spread Sheet contains detailed Performance and Dimension information:
https://imageevent.com/holl_ands/zigzaglpa/uhflpda/uhf7ellpdawedgelayered

If you want a simple M4 4-Bay Bowtie with Very High F/B (and hence ALSO Very High F/R), Spacings between (Many) Reflector Rods needs to be about 1-inch for F/B Min ~ 25+ dB LIMIT [for that size Reflector....likely higher for Wider, Folded Reflector]:
https://photos.imageevent.com/holl_ands/multibay/compare//M4 9-5x9 and xxRR - UHF FR.jpg

And F/B Min ~ 25 dB LIMIT [for that size Reflector] was also found for (old) CM4228 at 1-in Vertical Grid Spacing...although F/R [but NOT F/B] could be pushed significantly higher at 0.5-in Spacing. I believe that this is also roughly true for other Multi-Bay Bowtie Antennas:
https://photos.imageevent.com/holl_... Refl Grid Sizes - UHF F_R and F_B Ratios.jpg
 
#17 ·
Yurii Pylypenko, are sujest ing the RR also ? Then your taking away the main objective of this thread easy to build home brew, most parts bought at hardware store or scrap yard hunting,

And you should model that RR with a 4 inch of add on to the RR top and bottom so it looks like this [ ,

These elements like a horn type RR a big flat C ( [ ) and place the element as a starting point inwards from the end of the top bottom RR 2x4 , back in 1.5 inches in

Then fine tune from there
 
#20 ·
Your posted HFSS Results appear to be for the SAME Dimensions as I posted....which are about 0.4 dB higher Gain all across the Band.

In order to NOT disadvantage reception on any Channel, I intentionally TRY to Design an Antenna with SAME Gain on Lowest Freqs as on Highest Freqs...so that Max is somewhere in-between....usually quite close to High End of the Band. As is seen in both your HFSS Plots and my EVAL Performance Results (see posted File) BTW: EVAL differs from 4nec2 due to AGT Corr ONLY being calculated for 584 MHz vice ALL Freqs in EVAL.

Can I presume that your recommendation of a 9% Smaller Quadazoid would be to move the Max Gain to 698 MHz....at the expense of considerable LOSS on 470 MHz??? You COULD do that if you wanted....but I generally do NOT advise it. In N. America, Higher Freq Channels are GENERALLY allocated MORE Power [up to 1 MW] to compensate for Higher Line-of-Sight Loss....so ALL Channel Freqs have ABOUT the same performance advantage....assuming that the Antenna Gain is the SAME across the Band ["PLANNING FACTORS" in FCC OET-69]. But we all know that Antenna Gain on the Lower UHF Channels is "typically" several dB LESS than the Higher UHF Channels....I'm trying to reverse this trend....
 
#21 ·
holl_ands that is why I am looking at ham antennas to convert , so far most out of this pdf I'm reading and modelling seem to hold a gain across the band by 1db or so , depending on the rescale, most of the reflector systems have to be re done like the skeleton- slot-radiator , it just needs a better reflector system for better F/B , I'm modelling right now but looks like a > 75 ohm <200 ohms for now , 12 db ,I don't understand how to do log math
log 10 I assume is 1
skeleton- slot-radiator, is to have a greater band width

S= 6740/F inches
W=2259/F inches
D= diameter of wire
F=Frequency in Mhz
Z0=276 log10 W/D ,
 
#22 ·
going back to post ones model. I'm now modeling in some new impendence matching wires to hold the impedence close to 300- ohms , as it starts to rise in the upper bands, will also be running some off set , spacing in the upper and lower elements to see how it effects gain and swr.
first test model I build out of 14 guage wire , was a little tricky to weld up , I had a 36 x36 inch reflector with 0.50 x 0.50 inch screen mesh.
width of RR was to large to work effectively, this element likes tall narrow RR
 
#24 ·
3/8" tubing is easier to find in our area. Probably to expensive to run down to Home Depot and buy the parts. Our local Habitat Restore(used construction materials resale store) often has a bunch of used 3/8" copper that's pretty cheap. Let me know what you think of this design.

CM Adjusting the wire mesh width of 2x4 will only reduce F/B and bring up gain
CM 3/8" tubing (Easier to find than 1/4)
CM SWR seems not to bad
CM EN
CE
SY Eradius=0.1875
SY Gradius=0.0625
SY Sradius=0.155
SY Dist_back=-4.375
SY db=Dist_back
SY feed_gap=1.5625
SY feed=feed_gap/2
SY rect_width=5.50
SY rs=rect_width/2
SY z1=5.25
SY z2=8.375
GW 1 3 0 -feed 0 0 feed 0 Sradius
GW 2 1 0 -feed 0 0 -rs 0 Eradius
GW 3 1 0 feed 0 0 rs 0 Eradius
GW 4 4 0 -rs 0 0 -rs z1 Eradius
GW 5 4 0 rs 0 0 rs z1 Eradius
GW 6 4 0 -rs z1 0 rs z1 Eradius
GW 7 4 0 -rs z1 0 -rs z2 Eradius
GW 8 4 0 rs z1 0 rs z2 Eradius
GW 9 4 0 -rs z2 0 rs z2 Eradius
GW 10 4 0 -rs 0 0 -rs -z1 Eradius
GW 11 4 0 rs 0 0 rs -z1 Eradius
GW 12 4 0 -rs -z1 0 rs -z1 Eradius
GW 13 4 0 -rs -z1 0 -rs -z2 Eradius
GW 14 4 0 rs -z1 0 rs -z2 Eradius
GW 15 4 0 -rs -z2 0 rs -z2 Eradius
GW 17 7 db -8 10 db -4 10 Gradius
GW 18 3 db -4 10 db -4 12 Gradius
GW 19 7 db -4 12 db -8 12 Gradius
GW 20 7 db -4 12 db 0 12 Gradius
GW 21 3 db 0 12 db 0 10 Gradius
GW 22 7 db 0 10 db -4 10 Gradius
GW 23 7 db 0 12 db 4 12 Gradius
GW 24 3 db 4 12 db 4 10 Gradius
GW 25 7 db 4 10 db 0 10 Gradius
GW 26 7 db 4 10 db 8 10 Gradius
GW 28 7 db 8 12 db 4 12 Gradius
GW 30 7 db -8 8 db -4 8 Gradius
GW 31 3 db -4 8 db -4 10 Gradius
GW 34 3 db 0 10 db 0 8 Gradius
GW 35 7 db 0 8 db -4 8 Gradius
GW 37 3 db 4 10 db 4 8 Gradius
GW 38 7 db 4 8 db 0 8 Gradius
GW 39 7 db 4 8 db 8 8 Gradius
GW 42 7 db -8 6 db -4 6 Gradius
GW 43 3 db -4 6 db -4 8 Gradius
GW 44 3 db 0 8 db 0 6 Gradius
GW 45 7 db 0 6 db -4 6 Gradius
GW 46 3 db 4 8 db 4 6 Gradius
GW 47 7 db 4 6 db 0 6 Gradius
GW 48 7 db 4 6 db 8 6 Gradius
GW 51 7 db -8 4 db -4 4 Gradius
GW 52 3 db -4 4 db -4 6 Gradius
GW 53 3 db 0 6 db 0 4 Gradius
GW 54 7 db 0 4 db -4 4 Gradius
GW 55 3 db 4 6 db 4 4 Gradius
GW 56 7 db 4 4 db 0 4 Gradius
GW 57 7 db 4 4 db 8 4 Gradius
GW 60 7 db -8 2 db -4 2 Gradius
GW 61 3 db -4 2 db -4 4 Gradius
GW 62 3 db 0 4 db 0 2 Gradius
GW 63 7 db 0 2 db -4 2 Gradius
GW 64 3 db 4 4 db 4 2 Gradius
GW 65 7 db 4 2 db 0 2 Gradius
GW 66 7 db 4 2 db 8 2 Gradius
GW 69 7 db -8 -5.464e-15 db -4 -5.464e-15 Gradius
GW 70 3 db -4 -5.464e-15 db -4 2 Gradius
GW 71 3 db 0 2 db 0 -5.464e-15 Gradius
GW 72 7 db 0 -5.464e-15 db -4 -5.464e-15 Gradius
GW 73 3 db 4 2 db 4 -5.464e-15 Gradius
GW 74 7 db 4 -5.464e-15 db 0 -5.464e-15 Gradius
GW 75 7 db 4 -5.464e-15 db 8 -5.464e-15 Gradius
GW 78 7 db -8 -2 db -4 -2 Gradius
GW 79 3 db -4 -2 db -4 -5.464e-15 Gradius
GW 80 3 db 0 -5.464e-15 db 0 -2 Gradius
GW 81 7 db 0 -2 db -4 -2 Gradius
GW 82 3 db 4 -5.464e-15 db 4 -2 Gradius
GW 83 7 db 4 -2 db 0 -2 Gradius
GW 84 7 db 4 -2 db 8 -2 Gradius
GW 87 7 db -8 -4 db -4 -4 Gradius
GW 88 3 db -4 -4 db -4 -2 Gradius
GW 89 3 db 0 -2 db 0 -4 Gradius
GW 90 7 db 0 -4 db -4 -4 Gradius
GW 91 3 db 4 -2 db 4 -4 Gradius
GW 92 7 db 4 -4 db 0 -4 Gradius
GW 93 7 db 4 -4 db 8 -4 Gradius
GW 96 7 db -8 -6 db -4 -6 Gradius
GW 97 3 db -4 -6 db -4 -4 Gradius
GW 98 3 db 0 -4 db 0 -6 Gradius
GW 99 7 db 0 -6 db -4 -6 Gradius
GW 100 3 db 4 -4 db 4 -6 Gradius
GW 101 7 db 4 -6 db 0 -6 Gradius
GW 102 7 db 4 -6 db 8 -6 Gradius
GW 105 7 db -8 -8 db -4 -8 Gradius
GW 106 3 db -4 -8 db -4 -6 Gradius
GW 107 3 db 0 -6 db 0 -8 Gradius
GW 108 7 db 0 -8 db -4 -8 Gradius
GW 109 3 db 4 -6 db 4 -8 Gradius
GW 110 7 db 4 -8 db 0 -8 Gradius
GW 111 7 db 4 -8 db 8 -8 Gradius
GW 114 7 db -8 -10 db -4 -10 Gradius
GW 115 3 db -4 -10 db -4 -8 Gradius
GW 116 3 db 0 -8 db 0 -10 Gradius
GW 117 7 db 0 -10 db -4 -10 Gradius
GW 118 3 db 4 -8 db 4 -10 Gradius
GW 119 7 db 4 -10 db 0 -10 Gradius
GW 120 7 db 4 -10 db 8 -10 Gradius
GW 123 7 db -8 -12 db -4 -12 Gradius
GW 124 3 db -4 -12 db -4 -10 Gradius
GW 125 3 db 0 -10 db 0 -12 Gradius
GW 126 7 db 0 -12 db -4 -12 Gradius
GW 127 3 db 4 -10 db 4 -12 Gradius
GW 128 7 db 4 -12 db 0 -12 Gradius
GW 129 7 db 4 -12 db 8 -12 Gradius
GW 204 3 db 8 10 db 8 12 Gradius
GW 205 3 db 8 8 db 8 10 Gradius
GW 206 3 db 8 6 db 8 8 Gradius
GW 207 3 db 8 4 db 8 6 Gradius
GW 208 3 db 8 2 db 8 4 Gradius
GW 209 3 db 8 -5.464e-15 db 8 2 Gradius
GW 210 3 db 8 -2 db 8 -5.464e-15 Gradius
GW 211 3 db 8 -4 db 8 -2 Gradius
GW 212 3 db 8 -6 db 8 -4 Gradius
GW 213 3 db 8 -8 db 8 -6 Gradius
GW 214 3 db 8 -10 db 8 -8 Gradius
GW 215 3 db 8 -12 db 8 -10 Gradius
GW 216 3 db -8 10 db -8 12 Gradius
GW 217 3 db -8 8 db -8 10 Gradius
GW 218 3 db -8 6 db -8 8 Gradius
GW 219 3 db -8 4 db -8 6 Gradius
GW 220 3 db -8 2 db -8 4 Gradius
GW 221 3 db -8 -5.464e-15 db -8 2 Gradius
GW 222 3 db -8 -2 db -8 -5.464e-15 Gradius
GW 223 3 db -8 -4 db -8 -2 Gradius
GW 224 3 db -8 -6 db -8 -4 Gradius
GW 225 3 db -8 -8 db -8 -6 Gradius
GW 226 3 db -8 -10 db -8 -8 Gradius
GW 227 3 db -8 -12 db -8 -10 Gradius
GS 0 0 0.0254
GE 0
LD 5 0 0 0 58000000
GN -1
EK
EX 0 1 2 0 1 0 0
FR 0 25 0 0 470 10
RP 0 1 73 1510 90 0 1 5 0 0
EN

Looks like it would be an easy build and cheap, if you can find used copper.
 
#25 ·
QUAD-RECTANGLE with 24"Hx16"W Screen Grid (2"Hx4"W):

Very Flat Freq Response, but Excessive SWR on 470 MHz and drop in F/B & F/R on Upper Channels, see EVAL Summary. I also had to adjust SOURCE Radius for AGT=1.0:

Code:
Input file : Z:\4nec2_PLUS\U\U - Loops\U - Quad-Rect by jhavener\
UHF_Quadruple_Rectangles_24x16_ScnGrid=2x4_ljhavener.nec
Freq sweeps: [(278, 12, 61)]
Autosegmentation: NO

         --- Gain ---              -- Ratios -- -- Impedance --
   Freq    Raw    Net   SWR BeamW    F/R    F/B    Real    Imag  AGT  corr
==========================================================================
  470.0   9.70   8.41  3.06  69.8  17.87  35.04  227.04 -298.17 1.00 -0.00
  482.0   9.64   8.70  2.59  69.3  18.01  32.54  231.62 -250.89 1.00 -0.00
  494.0   9.64   8.95  2.25  68.9  18.13  31.13  240.19 -214.97 1.00 -0.00
  506.0   9.68   9.17  2.01  68.7  18.13  30.40  249.85 -188.22 1.00 -0.00
  518.0   9.74   9.34  1.84  68.5  18.03  29.89  259.27 -168.24 1.00 -0.00
  530.0   9.81   9.49  1.73  68.2  17.88  29.38  268.11 -153.29 1.00 -0.00
  542.0   9.87   9.61  1.64  68.1  17.70  28.82  276.27 -142.31 1.00 -0.00
  554.0   9.94   9.71  1.59  67.9  17.54  28.23  283.68 -134.60 1.00 -0.00
  566.0  10.01   9.81  1.55  67.7  17.38  27.63  290.20 -129.66 1.00 -0.00
  578.0  10.07   9.88  1.53  67.5  17.22  27.03  295.65 -127.06 1.00 -0.00
  590.0  10.13   9.94  1.52  67.2  17.07  26.46  299.85 -126.41 1.00 -0.00
  602.0  10.19  10.00  1.52  67.0  16.94  25.90  302.63 -127.28 1.00 -0.00
  614.0  10.24  10.05  1.53  66.8  16.81  25.36  303.88 -129.27 1.00 -0.00
  626.0  10.29  10.09  1.54  66.6  16.68  24.84  303.53 -131.96 1.00 -0.00
  638.0  10.35  10.13  1.56  66.4  16.54  24.35  301.58 -134.93 1.00 -0.01
  650.0  10.39  10.16  1.58  66.1  16.41  23.85  298.09 -137.77 1.00 -0.01
  662.0  10.43  10.19  1.60  65.8  16.29  23.36  293.19 -140.12 1.00 -0.01
  674.0  10.45  10.20  1.62  65.5  16.17  22.86  287.09 -141.63 1.00 -0.01
  686.0  10.46  10.20  1.63  65.2  16.06  22.35  280.02 -142.03 1.00 -0.01
  698.0  10.47  10.20  1.65  64.9  15.96  21.83  272.28 -141.08 1.00 -0.02

  710.0  10.45  10.18  1.65  64.5  15.86  21.28  264.22 -138.64 1.00 -0.02
  722.0  10.40  10.13  1.66  64.3  15.77  20.70  256.16 -134.59 1.00 -0.02
  734.0  10.33  10.06  1.65  63.9  15.69  20.09  248.47 -128.92 1.00 -0.02
  746.0  10.22   9.96  1.64  63.5  15.62  19.44  241.52 -121.66 1.00 -0.02
  758.0  10.11   9.86  1.62  63.1  15.57  18.75  235.65 -112.91 0.99 -0.05
  770.0   9.92   9.68  1.59  62.8  15.54  18.00  231.22 -102.80 0.99 -0.05
  782.0   9.69   9.48  1.55  62.6  15.54  17.22  228.78  -91.57 0.99 -0.05
  794.0   9.43   9.25  1.50  62.9  15.45  16.49  228.78  -80.09 0.99 -0.05
  806.0   9.19   9.04  1.45  62.8  15.20  15.84  230.56  -69.16 0.99 -0.05
Press any key to continue . . .
 
#26 ·
RE-SCALED QUAD-RECTANGLE with 24"Hx16"W Screen Grid (2"Hx4"W):

To improve SWR on 470 MHz, I initially tried adjusting Separation between Screen Grid and Quad-Rect, but to no avail.

So I Rescaled JUST the Quad-Rectangle to be 4% Larger. Here is the modified EVAL Summary and slightly modified 4nec2 File. I did NOT try to improve F/B & F/R Ratio on Upper Channels:

Code:
Input file : Z:\4nec2_PLUS\U\U - Loops\U - Quad-Rect by ljhavener/
UHF_Quad_Rectangles_24x16_ScnGrid=2x4_ljhavener_F=1-04.nec
Freq sweeps: [(470, 12, 29)]
Autosegmentation: NO

         --- Gain ---              -- Ratios -- -- Impedance --
   Freq    Raw    Net   SWR BeamW    F/R    F/B    Real    Imag  AGT  corr
==========================================================================
  470.0   9.75   8.89  2.48  69.8  17.84  36.27  218.52 -226.28 1.00 -0.00
  482.0   9.70   9.10  2.12  69.3  17.97  33.63  227.94 -188.08 1.00 -0.00
  494.0   9.70   9.29  1.86  68.9  18.07  32.24  240.66 -159.22 1.00 -0.00
  506.0   9.74   9.45  1.69  68.7  18.07  31.57  254.07 -138.34 1.00 -0.00
  518.0   9.81   9.59  1.57  68.4  17.99  31.09  266.90 -123.55 1.00 -0.00
  530.0   9.88   9.71  1.49  68.1  17.85  30.57  278.76 -113.42 1.00 -0.00
  542.0   9.95   9.81  1.44  68.0  17.69  29.97  289.52 -107.06 1.00 -0.00
  554.0  10.02   9.89  1.41  67.8  17.53  29.32  299.04 -103.85 1.00 -0.00
  566.0  10.09   9.97  1.40  67.6  17.38  28.66  307.11 -103.32 1.00 -0.00
  578.0  10.15  10.02  1.41  67.4  17.23  28.01  313.51 -105.02 1.00 -0.00
  590.0  10.22  10.09  1.42  67.1  17.10  27.40  318.02 -108.47 1.00 -0.00
  602.0  10.27  10.12  1.45  66.9  16.97  26.80  320.46 -113.17 1.00 -0.00
  614.0  10.33  10.17  1.47  66.6  16.86  26.25  320.74 -118.59 1.00 -0.00
  626.0  10.38  10.21  1.50  66.4  16.75  25.71  318.84 -124.18 1.00 -0.00
  638.0  10.43  10.24  1.52  66.1  16.62  25.19  314.87 -129.40 1.00 -0.01
  650.0  10.46  10.25  1.55  65.8  16.51  24.67  309.03 -133.75 1.00 -0.01
  662.0  10.48  10.26  1.57  65.5  16.41  24.15  301.60 -136.77 1.00 -0.01
  674.0  10.49  10.26  1.59  65.2  16.31  23.62  293.00 -138.09 1.00 -0.02
  686.0  10.46  10.22  1.60  65.0  16.22  23.05  283.67 -137.44 1.00 -0.02
  698.0  10.42  10.17  1.61  64.5  16.15  22.46  274.11 -134.63 1.00 -0.02

  710.0  10.34  10.10  1.60  64.3  16.07  21.82  264.88 -129.62 0.99 -0.03
  722.0  10.22   9.99  1.59  63.9  16.00  21.13  256.52 -122.48 0.99 -0.03
  734.0  10.06   9.84  1.57  63.4  15.95  20.40  249.52 -113.41 0.99 -0.03
  746.0   9.87   9.67  1.53  63.1  15.89  19.62  244.35 -102.75 0.99 -0.05
  758.0   9.62   9.45  1.49  62.6  15.86  18.79  241.32  -90.88 0.99 -0.05
  770.0   9.33   9.19  1.44  62.3  15.83  17.91  240.72  -78.21 0.99 -0.05
  782.0   9.02   8.91  1.38  62.2  15.82  17.01  242.87  -65.22 0.99 -0.06
  794.0   8.72   8.64  1.31  62.4  15.70  16.21  248.03  -52.95 0.99 -0.06
  806.0   8.48   8.43  1.25  62.4  15.39  15.54  255.29  -42.30 0.99 -0.06
Press any key to continue . . .

Code:
CM Quadruple Rectangles, 4nec2 by ljhavener, 5Apr2018
CM Adjusting the wire mesh width of 2x4 will only reduce F/B and bring up gain
CM 3/8" tubing (Easier to find than 1/4), SWR seems not to bad
CM
CM holl_ands mods: Tweak Sradius for AGT=1.0, Add CMD-EVAL's, Add FR/RP's, and
CM   add Rescale Factor to JUST Quad-Rect to avoid high SWR on 470 MHz, 5Apr2018.
CM
CMD--EVAL --auto-segmentation=0 --char-impedance=300 --num-cores=12
CMD--EVAL -s(470,12,29) --total-gain --publish
CE
SY Sradius=0.166	' Adjust for AGT=1.0, UHF=0.166 (Original was 0.155)
SY F=1.04		' Rescale Factor
'
SY Eradius=0.1875
SY Gradius=0.0625
SY Dist_back=-4.375
SY db=Dist_back
SY feed_gap=1.5625
SY feed=feed_gap/2
SY rect_width=5.50*F
SY rs=rect_width/2
SY z1=5.25*F
SY z2=8.375*F
'
GW 1 3 0 -feed 0 0 feed 0 Sradius
GW 2 1 0 -feed 0 0 -rs 0 Eradius
GW 3 1 0 feed 0 0 rs 0 Eradius
GW 4 4 0 -rs 0 0 -rs z1 Eradius
GW 5 4 0 rs 0 0 rs z1 Eradius
GW 6 4 0 -rs z1 0 rs z1 Eradius
GW 7 4 0 -rs z1 0 -rs z2 Eradius
GW 8 4 0 rs z1 0 rs z2 Eradius
GW 9 4 0 -rs z2 0 rs z2 Eradius
GW 10 4 0 -rs 0 0 -rs -z1 Eradius
GW 11 4 0 rs 0 0 rs -z1 Eradius
GW 12 4 0 -rs -z1 0 rs -z1 Eradius
GW 13 4 0 -rs -z1 0 -rs -z2 Eradius
GW 14 4 0 rs -z1 0 rs -z2 Eradius
GW 15 4 0 -rs -z2 0 rs -z2 Eradius
GW 17 7 db -8 10 db -4 10 Gradius
GW 18 3 db -4 10 db -4 12 Gradius
GW 19 7 db -4 12 db -8 12 Gradius
GW 20 7 db -4 12 db 0 12 Gradius
GW 21 3 db 0 12 db 0 10 Gradius
GW 22 7 db 0 10 db -4 10 Gradius
GW 23 7 db 0 12 db 4 12 Gradius
GW 24 3 db 4 12 db 4 10 Gradius
GW 25 7 db 4 10 db 0 10 Gradius
GW 26 7 db 4 10 db 8 10 Gradius
GW 28 7 db 8 12 db 4 12 Gradius
GW 30 7 db -8 8 db -4 8 Gradius
GW 31 3 db -4 8 db -4 10 Gradius
GW 34 3 db 0 10 db 0 8 Gradius
GW 35 7 db 0 8 db -4 8 Gradius
GW 37 3 db 4 10 db 4 8 Gradius
GW 38 7 db 4 8 db 0 8 Gradius
GW 39 7 db 4 8 db 8 8 Gradius
GW 42 7 db -8 6 db -4 6 Gradius
GW 43 3 db -4 6 db -4 8 Gradius
GW 44 3 db 0 8 db 0 6 Gradius
GW 45 7 db 0 6 db -4 6 Gradius
GW 46 3 db 4 8 db 4 6 Gradius
GW 47 7 db 4 6 db 0 6 Gradius
GW 48 7 db 4 6 db 8 6 Gradius
GW 51 7 db -8 4 db -4 4 Gradius
GW 52 3 db -4 4 db -4 6 Gradius
GW 53 3 db 0 6 db 0 4 Gradius
GW 54 7 db 0 4 db -4 4 Gradius
GW 55 3 db 4 6 db 4 4 Gradius
GW 56 7 db 4 4 db 0 4 Gradius
GW 57 7 db 4 4 db 8 4 Gradius
GW 60 7 db -8 2 db -4 2 Gradius
GW 61 3 db -4 2 db -4 4 Gradius
GW 62 3 db 0 4 db 0 2 Gradius
GW 63 7 db 0 2 db -4 2 Gradius
GW 64 3 db 4 4 db 4 2 Gradius
GW 65 7 db 4 2 db 0 2 Gradius
GW 66 7 db 4 2 db 8 2 Gradius
GW 69 7 db -8 -5.464e-15 db -4 -5.464e-15 Gradius
GW 70 3 db -4 -5.464e-15 db -4 2 Gradius
GW 71 3 db 0 2 db 0 -5.464e-15 Gradius
GW 72 7 db 0 -5.464e-15 db -4 -5.464e-15 Gradius
GW 73 3 db 4 2 db 4 -5.464e-15 Gradius
GW 74 7 db 4 -5.464e-15 db 0 -5.464e-15 Gradius
GW 75 7 db 4 -5.464e-15 db 8 -5.464e-15 Gradius
GW 78 7 db -8 -2 db -4 -2 Gradius
GW 79 3 db -4 -2 db -4 -5.464e-15 Gradius
GW 80 3 db 0 -5.464e-15 db 0 -2 Gradius
GW 81 7 db 0 -2 db -4 -2 Gradius
GW 82 3 db 4 -5.464e-15 db 4 -2 Gradius
GW 83 7 db 4 -2 db 0 -2 Gradius
GW 84 7 db 4 -2 db 8 -2 Gradius
GW 87 7 db -8 -4 db -4 -4 Gradius
GW 88 3 db -4 -4 db -4 -2 Gradius
GW 89 3 db 0 -2 db 0 -4 Gradius
GW 90 7 db 0 -4 db -4 -4 Gradius
GW 91 3 db 4 -2 db 4 -4 Gradius
GW 92 7 db 4 -4 db 0 -4 Gradius
GW 93 7 db 4 -4 db 8 -4 Gradius
GW 96 7 db -8 -6 db -4 -6 Gradius
GW 97 3 db -4 -6 db -4 -4 Gradius
GW 98 3 db 0 -4 db 0 -6 Gradius
GW 99 7 db 0 -6 db -4 -6 Gradius
GW 100 3 db 4 -4 db 4 -6 Gradius
GW 101 7 db 4 -6 db 0 -6 Gradius
GW 102 7 db 4 -6 db 8 -6 Gradius
GW 105 7 db -8 -8 db -4 -8 Gradius
GW 106 3 db -4 -8 db -4 -6 Gradius
GW 107 3 db 0 -6 db 0 -8 Gradius
GW 108 7 db 0 -8 db -4 -8 Gradius
GW 109 3 db 4 -6 db 4 -8 Gradius
GW 110 7 db 4 -8 db 0 -8 Gradius
GW 111 7 db 4 -8 db 8 -8 Gradius
GW 114 7 db -8 -10 db -4 -10 Gradius
GW 115 3 db -4 -10 db -4 -8 Gradius
GW 116 3 db 0 -8 db 0 -10 Gradius
GW 117 7 db 0 -10 db -4 -10 Gradius
GW 118 3 db 4 -8 db 4 -10 Gradius
GW 119 7 db 4 -10 db 0 -10 Gradius
GW 120 7 db 4 -10 db 8 -10 Gradius
GW 123 7 db -8 -12 db -4 -12 Gradius
GW 124 3 db -4 -12 db -4 -10 Gradius
GW 125 3 db 0 -10 db 0 -12 Gradius
GW 126 7 db 0 -12 db -4 -12 Gradius
GW 127 3 db 4 -10 db 4 -12 Gradius
GW 128 7 db 4 -12 db 0 -12 Gradius
GW 129 7 db 4 -12 db 8 -12 Gradius
GW 204 3 db 8 10 db 8 12 Gradius
GW 205 3 db 8 8 db 8 10 Gradius
GW 206 3 db 8 6 db 8 8 Gradius
GW 207 3 db 8 4 db 8 6 Gradius
GW 208 3 db 8 2 db 8 4 Gradius
GW 209 3 db 8 -5.464e-15 db 8 2 Gradius
GW 210 3 db 8 -2 db 8 -5.464e-15 Gradius
GW 211 3 db 8 -4 db 8 -2 Gradius
GW 212 3 db 8 -6 db 8 -4 Gradius
GW 213 3 db 8 -8 db 8 -6 Gradius
GW 214 3 db 8 -10 db 8 -8 Gradius
GW 215 3 db 8 -12 db 8 -10 Gradius
GW 216 3 db -8 10 db -8 12 Gradius
GW 217 3 db -8 8 db -8 10 Gradius
GW 218 3 db -8 6 db -8 8 Gradius
GW 219 3 db -8 4 db -8 6 Gradius
GW 220 3 db -8 2 db -8 4 Gradius
GW 221 3 db -8 -5.464e-15 db -8 2 Gradius
GW 222 3 db -8 -2 db -8 -5.464e-15 Gradius
GW 223 3 db -8 -4 db -8 -2 Gradius
GW 224 3 db -8 -6 db -8 -4 Gradius
GW 225 3 db -8 -8 db -8 -6 Gradius
GW 226 3 db -8 -10 db -8 -8 Gradius
GW 227 3 db -8 -12 db -8 -10 Gradius
'
GS 0 0 0.0254
GE 0
LD 5 0 0 0 58000000
GN -1
EK
EX 0 1 2 0 1 0 0
'
' FR 0 25 0 0 470 10		' Fm ljhavener
' RP 0 1 73 1510 90 0 1 5 0 0	' Fm ljhavener
'
' FR Freq Sweep choices in order of increasing calculation time (fm holl_ands):
' FR 0 0 0 0 470 0		' Fixed Freq
FR 0 29 0 0 470 12		' Freq Sweep 470-806 every 12 MHz - OLD UHF BAND
' FR 0 34 0 0 410 12		' Freq Sweep 410-806 every 12 MHz - Even Wider Sweep
' FR 0 39 0 0 470 6		' Freq Sweep 470-698 every 6 MHz - PREFERRED FOR UHF
' FR 0 77 0 0 470 3		' Freq Sweep 470-698 every 3 MHz
' FR 0 153 0 0 470 1.5		' Freq Sweep 470-698 every 1.5 MHz
' FR 0 61 0 0 400 10		' Freq Sweep 400-1000 every 10 MHz - WIDEBAND SWEEP
' FR 0 71 0 0 300 10		' Freq Sweep 300-1000 every 10 MHz - WIDEBAND SWEEP
' FR 0 61 0 0 278 12		' Freq Sweep 278-998 every 24 MHz - WIDEBAND SWEEP
' FR Hi-VHF choices:
' FR 0 15 0 0 174 3		' Freq Sweep 174-216 every 3 MHz
' FR 0 29 0 0 174 1.5		' Freq Sweep 174-216 every 1.5 MHz - PREFERRED
' FR 0 43 0 0 174 1		' Freq Sweep 174-216 every 1 MHz - Hi-Rez
' FR 0 26 0 0 150 6		' Freq Sweep 150-300 every 6 MHz - WIDEBAND SWEEP
' FR Lo-VHF choices:
' FR 0 35 0 0 54 1		' Frequency Sweep every 1 MHz for Ch2-6
' FR 0 36 0 0 75 1		' Frequency Sweep every 1 MHz for Ch5 + Ch6 + FM
' FR 0 28 0 0 54 6		' Wide Freq Sweep every 6 MHz for Ch2-13
' FR 0 64 0 0 54 12			' Super Wide Freq Sweep 54-810 every 12 MHz
' RP choices in order of increasing calculation time:
' RP 0 1 1 1510 90 90 1 1 0 0	' 1D Gain toward 0-deg Azimuth - SIDE GAIN
' RP 0 1 1 1510 90 0 1 1 0 0	' 1D Gain toward 90-deg Azimuth - FORWARD GAIN
' RP 0 1 1 1510 90 180 1 1 0 0	' 1D Gain toward 270-deg Azimuth - REVERSE GAIN
' RP 0 1 37 1510 90 0 1 5 0 0 	' 2D (Left only) Azimuthal Gain Slice
RP 0 1 73 1510 90 0 1 5 0 0	' 2D Azimuthal Gain Slice - PREFERRED
' RP 0 73 1 1510 90 0 5 1 0 0 	' 2D Elevation Gain Slice
' RP 0 73 73 1510 90 0 5 5 0 0 	' 3D Lower Hemisphere reveals antenna (Fixed Freq)
' RP 0 285 73 1510 90 0 5 5 0 0	' 3D Full Coverage obscures antenna (Fixed Freq)
EN
 
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