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Thanks for your work!

BTW, I don't know if this answer from a Silicondust tech to me in Feb is of any help to you:

For the HDHR3, you'll want the levels in between -24dBmV (60%) and +15dBmV (would be 125%). Might be OK a little higher too. For the HDHR4, you'd probably be OK down to -30dBmV (50%) but I wouldn't go above +12. The scale is 3dB=5%, and 0dBmV is 100%.
 

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Right on... Let me know if the values you see seem to make sense on your hdhr3.
 

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Excellent. Thanks, majortom.

I've updated the script and cleaned up the GetDebugData function a little.

Edit 1) replaced the "while" loop with a simpler "for" loop
Edit 2) added in the grep "seq 100" line so that it only shows channels with Symbol Quality of 100, but that can be removed if needed.
Edit 3) You hard coded your Device and Tuner into the RESULTS variable. It now uses the auto detected or user supplied ones.

Code:
$ ./channel_scan.sh -D
debug mode

Beginning scan on 105281ED, tuner 0 at 04/08/15 21:24:23

20 channels found
RF	Strngth	dBmV	dBm	Quality	SNR	Symbol	dbg	Calc_dBmV	Calc_dBm
--------------------------------------------------------------------------------------------
9	100	0	-48.75	98	32.34	100	-3425	-420.7		-469.45
14	95	-3	-51.75	85	28.05	100	-4850	-620.2		-668.95
15	81	-11.4	-60.15	51	16.83	100	-5700	-739.2		-787.95
19	98	-1.2	-49.95	76	25.08	100	-4700	-599.2		-647.95
20	100	0	-48.75	85	28.05	100	-4000	-501.2		-549.95
25	100	0	-48.75	100	33	100	-2675	-315.7		-364.45
29	53	-28.2	-76.95	41	13.53	100	-7425	-980.7		-1029.45
30	47	-31.8	-80.55	41	13.53	100	-7775	-1029.7		-1078.45
32	100	0	-48.75	100	33	100	-3050	-368.2		-416.95
33	91	-5.4	-54.15	77	25.41	100	-5175	-665.7		-714.45
35	52	-28.8	-77.55	42	13.86	100	-7525	-994.7		-1043.45
36	98	-1.2	-49.95	67	22.11	100	-4800	-613.2		-661.95
38	100	0	-48.75	100	33	100	-4475	-567.7		-616.45
39	100	0	-48.75	100	33	100	-4675	-595.7		-644.45
40	100	0	-48.75	100	33	100	-3350	-410.2		-458.95
41	100	0	-48.75	98	32.34	100	-2625	-308.7		-357.45
43	100	0	-48.75	100	33	100	-3850	-480.2		-528.95
44	100	0	-48.75	100	33	100	-3200	-389.2		-437.95
47	100	0	-48.75	98	32.34	100	-3325	-406.7		-455.45
49	100	0	-48.75	98	32.34	100	-4725	-602.7		-651.45
 

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awesome, yeah was just a quick hack job to get what I wanted out of it...
Thanks for taking the time to clean it up.

Like I said, it's calibrated against my hdhomerun3, so it won't look right using an hdhr4.
However, if someone wants to take the time to collect some debug data from an hdhr4, and post it I'd be willing
to do some more hackin to come up with a formula suitable for an hdhr4's 'dbg=' values.

Really just would need recorded SS values vs dbg = values throughout as much of the 0-100 SS range as possible.
Can even do this by just moving your antenna around, taking care to record as many unique values as possible within the range...
May be a little time consuming, but is probably worth the effort to confirm or deny how linear the hdhr4 is.

Edit: the only reason I didn't use the grep on lockable signals was in case ya wanted to look for rogue strong signals that are outside
of your normal stations, or stations on the hairy edge for whatever reason. Maybe stick a comment in there so the user knows where they
can comment out the grep on seq 100 to see all???
 

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Here's a run from my HDHR3. The numbers are quite close to the values in my TV fool and the two positive values for 25 and 32 I'd say are representative of how strong those signals are for me. They never waver. Even in the worst conditions they're rock steady. BTW, anyone have an idea why CBLT and CBLFT don't show up in TVFOool? Just noticed that.

RF Strngth dBmV dBm Quality SNR Symbol dbg Calc_dBmV
--------------------------------------------------------------------------------
14 74 -15.6 -64.35 75 24.75 100 -533 -15.82
15 94 -3.6 -52.35 70 23.1 100 -435 -2.1
20 91 -5.4 -54.15 57 18.81 100 -452 -4.48
22 87 -7.8 -56.55 78 25.74 100 -471 -7.14
25 100 0 -48.75 73 24.09 100 -377 6.02
32 100 0 -48.75 85 28.05 100 -388 4.48
33 76 -14.4 -63.15 75 24.75 100 -528 -15.12
36 98 -1.2 -49.95 69 22.77 100 -421 -0.14
38 84 -9.6 -58.35 85 28.05 100 -490 -9.8
39 81 -11.4 -60.15 74 24.42 100 -504 -11.76
40 77 -13.8 -62.55 64 21.12 100 -525 -14.7
41 92 -4.8 -53.55 73 24.09 100 -450 -4.2
43 80 -12 -60.75 77 25.41 100 -508 -12.32
44 85 -9 -57.75 65 21.45 100 -486 -9.24
47 82 -10.8 -59.55 63 20.79 100 -503 -11.62
49 69 -18.6 -67.35 60 19.8 100 -564 -20.16

Really just would need recorded SS values vs dbg = values throughout as much of the 0-100 SS range as possible.
I suck at bash scripts but if someone wants to write one that goes through all the channels with your "hdhomerun_config device_id get /tuner0/debug etc" lines, I'll run it against my hdhr4 and post the results. I'm assuming you'd like that run done without the amp?
 

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I've added a new -A option which does a debug output, showing all channels ( 2 through 51 )
 

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I'll do a quick run on the HDHR4 (amplified) now in case that info is useful and then do a run in a day or so once I get the amp off.

Code:
RF      Strngth dBmV    dBm     Quality SNR     Symbol  dbg     Calc_dBmV       Calc_dBm
-------------------------------------------------------------------------------------
2       66      -20.4   -69.15  0       0       0       -6450   -844.2          -892.95
3       70      -18     -66.75  0       0       0       -6175   -805.7          -854.45
4       69      -18.6   -67.35  0       0       0       -6275   -819.7          -868.45
5       59      -24.6   -73.35  0       0       0       -6875   -903.7          -952.45
6       57      -25.8   -74.55  0       0       0       -6925   -910.7          -959.45
7       0       -60     -108.75 0       0       0       -12800  -1733.2         -1781.95
8       51      -29.4   -78.15  0       0       0       -7425   -980.7          -1029.45
9       100     0       -48.75  67      22.11   100     -2975   -357.7          -406.45
10      80      -12     -60.75  0       0       0       -5700   -739.2          -787.95
11      83      -10.2   -58.95  0       0       0       -5475   -707.7          -756.45
12      78      -13.2   -61.95  0       0       0       -5775   -749.7          -798.45
13      71      -17.4   -66.15  0       0       0       -6150   -802.2          -850.95
14      100     0       -48.75  66      21.78   100     -4375   -553.7          -602.45
15      100     0       -48.75  55      18.15   100     -3975   -497.7          -546.45
16      69      -18.6   -67.35  0       0       0       -6375   -833.7          -882.45
17      63      -22.2   -70.95  41      13.53   100     -6725   -882.7          -931.45
18      44      -33.6   -82.35  0       0       0       -7900   -1047.2         -1095.95
19      100     0       -48.75  76      25.08   100     -4025   -504.7          -553.45
20      100     0       -48.75  56      18.48   100     -4100   -515.2          -563.95
21      58      -25.2   -73.95  0       0       0       -7075   -931.7          -980.45
22      100     0       -48.75  98      32.34   100     -3650   -452.2          -500.95
23      81      -11.4   -60.15  57      18.81   100     -5700   -739.2          -787.95
24      50      -30     -78.75  0       0       0       -7550   -998.2          -1046.95
25      100     0       -48.75  78      25.74   100     -3250   -396.2          -444.95
26      52      -28.8   -77.55  41      13.53   0       -7450   -984.2          -1032.95
27      64      -21.6   -70.35  41      13.53   0       -6725   -882.7          -931.45
28      47      -31.8   -80.55  41      13.53   0       -7775   -1029.7         -1078.45
29      49      -30.6   -79.35  0       0       0       -7650   -1012.2         -1060.95
30      51      -29.4   -78.15  0       0       0       -7550   -998.2          -1046.95
31      57      -25.8   -74.55  0       0       0       -7200   -949.2          -997.95
32      100     0       -48.75  100     33      100     -2450   -284.2          -332.95
33      100     0       -48.75  90      29.7    100     -3925   -490.7          -539.45
34      52      -28.8   -77.55  0       0       0       -7525   -994.7          -1043.45
35      78      -13.2   -61.95  41      13.53   0       -5950   -774.2          -822.95
36      100     0       -48.75  42      13.86   100     -4525   -574.7          -623.45
37      48      -31.2   -79.95  0       0       0       -7750   -1026.2         -1074.95
38      100     0       -48.75  98      32.34   100     -3925   -490.7          -539.45
39      100     0       -48.75  98      32.34   100     -4000   -501.2          -549.95
40      100     0       -48.75  69      22.77   100     -4450   -564.2          -612.95
41      100     0       -48.75  68      22.44   100     -3900   -487.2          -535.95
42      58      -25.2   -73.95  0       0       0       -7225   -952.7          -1001.45
43      96      -2.4    -51.15  65      21.45   100     -4975   -637.7          -686.45
44      100     0       -48.75  57      18.81   100     -4725   -602.7          -651.45
45      0       -60     -108.75 0       0       0       -12800  -1733.2         -1781.95
46      0       -60     -108.75 0       0       0       -12800  -1733.2         -1781.95
47      100     0       -48.75  78      25.74   100     -4575   -581.7          -630.45
48      70      -18     -66.75  0       0       0       -6575   -861.7          -910.45
49      87      -7.8    -56.55  41      13.53   0       -5575   -721.7          -770.45
50      63      -22.2   -70.95  0       0       0       -7000   -921.2          -969.95
51      0       -60     -108.75 0       0       0       -12800  -1733.2         -1781.95
 

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apparently MythTV does not "lock" the tuner.
Interesting, I dug a bit deeper into this and found ticket #10043 dated for years ago. It was closed with the following comment:

We don't support sharing tuners with other applications at the same time and thus the locking API is unneeded for supported use cases. If you want to submit a patch to add locking, we are happy to look at it.
Given your findings (and the this post), obviously either no patch was ever submitted or it wasn't approved.

I can understand the rationale behind this in that they wan't MythTV to manage the priorities of tuner access, since they don't want a third party application to hijack a tuner and prevent an important programme from recording.

Having said that, not locking the tuner could inadvertently cause a tuner they are using from accidentally being hijacked. A better option might be to have the backend lock all configured tuners when it starts up and unlock them when it shuts down.
 

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The only time the locking is really an issue for me is during tropo season when I'm "hunting" for distant catches. Sometime I forget that Myth is recording some movie and I go ahead and run 905shmick's script.
 

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Any ideas why the Buffalo-aimed setup and HDHR4 a struggling with some signals?
It looks like the same thing is happening that I see here. The HDHR4 seems to be sensitive to overload, multipath or some other type of interference. When that happens, signal quality drops to 41-42 and the signal lock fails.

1. I see this situation with the HDHR4 and one channel that is known to have a lot of multipath. The HDHR3 works fine with this channel.
2. I have a 6dB attenuator to reduce signal strength and prevent overload. If I remove the attenuator (increase overall signal strength) the same thing to several more channels (signal quality drops to 41-42 and the lock fails.) I have a very strong VHF channel plus am FM station just 3.5 km away that are known to cause issues. Before the digital transition, the harmonic interference cause by these stations was quite visible on the UHF band which is why the attenuator was added.

I haven't yet been able to determine exactly what is causing this issue or if it is caused by several factors. The only suggestion I can make is to remove the preamp with the HDHR4 and see what happens.
 

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It looks like the same thing is happening that I see here. The HDHR4 seems to be sensitive to overload, multipath or some other type of interference. When that happens, signal quality drops to 41-42 and the signal lock fails.
I just did a manual scan with the config GUI and you're right, the signal quality on the unwatchable stations always flickers between 41-42%. It's like it's a "hard fail" because it never seems to drop below that. As I was scanning, even Buffalo's low-powered WBXZ-LP was at 63% strength, 41-42% quality and a symbol that shot between 0-100. It'll be interesting to see what happens if I drop the amp from the Buffalo-aimed setup.

Should I keep the variable attenuator in the mix or try it without?
 

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I'm assuming you'd like that run done without the amp?
Just as many unique points between 0-100 as possible.
You can run it several times at diff times of the day to get diff values, or preferabably
while moving your antenna around. Which may bring some of the 100 s down, so on.
You'll know which ones are really high vs ones which are just above 100.
 

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I think the dbg value just might be 10x the value for the newer units.

If I divide $15 by 10 on the output, the results look relatively sane.

(.14 * $15/10 + 58.8),"\t"(.14 * $15/10 + 58.8 - 48.75 )

Code:
RF	Strngth	dBmV	dBm	Quality	SNR	Symbol	dbg	Calc_dBmV	Calc_dBm
--------------------------------------------------------------------------------------------
2	96	-2.4	-51.15	0	0	0	-4675	-6.65		-55.4
3	100	0	-48.75	0	0	0	-3675	7.35		-41.4
4	80	-12	-60.75	0	0	0	-5650	-20.3		-69.05
5	63	-22.2	-70.95	0	0	0	-6625	-33.95		-82.7
6	59	-24.6	-73.35	0	0	0	-6825	-36.75		-85.5
7	54	-27.6	-76.35	0	0	0	-7350	-44.1		-92.85
8	49	-30.6	-79.35	0	0	0	-7600	-47.6		-96.35
9	100	0	-48.75	98	32.34	100	-3450	10.5		-38.25
10	53	-28.2	-76.95	0	0	0	-7350	-44.1		-92.85
11	49	-30.6	-79.35	0	0	0	-7550	-46.9		-95.65
12	70	-18	-66.75	45	14.85	0	-6250	-28.7		-77.45
13	37	-37.8	-86.55	0	0	0	-8250	-56.7		-105.45
14	94	-3.6	-52.35	85	28.05	100	-4900	-9.8		-58.55
15	82	-10.8	-59.55	52	17.16	100	-5625	-19.95		-68.7
16	40	-36	-84.75	0	0	0	-8125	-54.95		-103.7
17	56	-26.4	-75.15	41	13.53	0	-7200	-42		-90.75
18	35	-39	-87.75	0	0	0	-8475	-59.85		-108.6
19	99	-0.6	-49.35	78	25.74	100	-4650	-6.3		-55.05
20	100	0	-48.75	98	32.34	100	-3825	5.25		-43.5
21	58	-25.2	-73.95	0	0	0	-7075	-40.25		-89
22	63	-22.2	-70.95	0	0	0	-6800	-36.4		-85.15
23	55	-27	-75.75	0	0	0	-7300	-43.4		-92.15
24	0	-60	-108.75	0	0	0	-12800	-120.4		-169.15
25	100	0	-48.75	100	33	100	-2600	22.4		-26.35
26	52	-28.8	-77.55	42	13.86	0	-7450	-45.5		-94.25
27	52	-28.8	-77.55	41	13.53	0	-7475	-45.85		-94.6
28	39	-36.6	-85.35	0	0	0	-8250	-56.7		-105.45
29	55	-27	-75.75	41	13.53	100	-7300	-43.4		-92.15
30	46	-32.4	-81.15	0	0	0	-7875	-51.45		-100.2
31	46	-32.4	-81.15	0	0	0	-7850	-51.1		-99.85
32	100	0	-48.75	100	33	100	-3125	15.05		-33.7
33	85	-9	-57.75	69	22.77	100	-5550	-18.9		-67.65
34	38	-37.2	-85.95	0	0	0	-8375	-58.45		-107.2
35	53	-28.2	-76.95	43	14.19	100	-7500	-46.2		-94.95
36	99	-0.6	-49.35	64	21.12	100	-4750	-7.7		-56.45
37	37	-37.8	-86.55	0	0	0	-8450	-59.5		-108.25
38	97	-1.8	-50.55	98	32.34	100	-4900	-9.8		-58.55
39	94	-3.6	-52.35	98	32.34	100	-5050	-11.9		-60.65
40	100	0	-48.75	100	33	100	-3300	12.6		-36.15
41	100	0	-48.75	98	32.34	100	-2575	22.75		-26
42	53	-28.2	-76.95	0	0	0	-7550	-46.9		-95.65
43	100	0	-48.75	100	33	100	-3925	3.85		-44.9
44	100	0	-48.75	100	33	100	-3150	14.7		-34.05
45	0	-60	-108.75	0	0	0	-12800	-120.4		-169.15
46	44	-33.6	-82.35	0	0	0	-8100	-54.6		-103.35
47	100	0	-48.75	98	32.34	100	-3350	11.9		-36.85
48	59	-24.6	-73.35	0	0	0	-7225	-42.35		-91.1
49	96	-2.4	-51.15	94	31.02	100	-5025	-11.55		-60.3
50	42	-34.8	-83.55	0	0	0	-8300	-57.4		-106.15
51	48	-31.2	-79.95	0	0	0	-7950	-52.5		-101.25
 

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Should I keep the variable attenuator in the mix or try it without?
Without the preamp I wouldn't use it. The signal values on the chart look high enough to maybe cause problems with an amp but none are high enough to cause issues without one.

I also see the brief 100% symbol quality value that drops to zero almost instantly with these stations. It's got to be some sort of failure condition in the HDHR4. I haven't looked into it very much but it would be nice to have it resolved. I see it happen with a lot of weak signals that should be coming in during tropo events.
 

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Just did two runs with the HDHR4. With the amp and then after.

Looking at the symbol qualities, you can see many had quite a good increase. Back to the balcony to do some aiming and see if I can make WNYO a bit better.

And, dang, wish I nab RF17 WBXZ...bunch of subchannels there. OTA trophies. :)

Code:
With AMP:

20 channels found
RF      Strngth dBmV    dBm     Quality Symbol  Virt#1  Name            Virt#2  Name            Virt#3  Name            Virt#4  Name            Virt#5  Name
------------------------------------------------------------------------
9       100     0       -48.75  68      100     9.1     CFTO
14      95      -3      -51.75  57      100     29.1    WUTV-HD         29.2    TCN             29.3    GritTV
15      100     0       -48.75  61      100     11.1    CHCH-DT
17      57      -25.8   -74.55  41      100
19      100     0       -48.75  71      100     19.1    TVO
20      100     0       -48.75  55      100     5.1     CBLT-DT
22      100     0       -48.75  98      100     15.1    StarRay
23      85      -9      -57.75  68      100     51.1    ION             51.2    qubo            51.3    IONLife         51.4    Shop            51.5    QVC             51.6    HSN
25      100     0       -48.75  68      100     25.1    CBLFTDT
32      100     0       -48.75  100     100     23.1    WNLO-HD         23.2    Bounce
33      100     0       -48.75  85      100     2.1     WGRZ-HD         2.2     WGRZ2.2         2.3     WGRZ2.3
35      79      -12.6   -61.35  41      100
38      100     0       -48.75  81      100     7.1     WKBW-HD
39      100     0       -48.75  85      100     4.1     WIVB-HD
40      100     0       -48.75  70      100     40.1    CJMT
41      100     0       -48.75  69      100     41.1    CIII-HD         41.2    CIII-SD
43      100     0       -48.75  69      100     17.1    WNED-HD         17.2    Think           0
44      100     0       -48.75  64      100     57.1    CITYTV
47      100     0       -48.75  74      100     47.1    CFMT
49      79      -12.6   -61.35  41      100

without AMP:

24 channels found
RF      Strngth dBmV    dBm     Quality Symbol  Virt#1  Name            Virt#2  Name            Virt#3  Name            Virt#4  Name            Virt#5  Name
------------------------------------------------------------------------
9       100     0       -48.75  78      100     9.1     CFTO
14      84      -9.6    -58.35  90      100     29.1    WUTV-HD         29.2    TCN             29.3    GritTV
15      92      -4.8    -53.55  67      100     11.1    CHCH-DT
17      45      -33     -81.75  41      100
19      97      -1.8    -50.55  63      100     19.1    TVO
20      97      -1.8    -50.55  57      100     5.1     CBLT-DT
22      100     0       -48.75  98      100     15.1    StarRay
23      77      -13.8   -62.55  85      100     51.1    ION             51.2    qubo            51.3    IONLife         51.4    Shop            51.5    QVC             51.6    HSN
25      100     0       -48.75  74      100     25.1    CBLFTDT
27      55      -27     -75.75  44      100     27.1    CIII-HD         27.2    CIII-SD
28      34      -39.6   -88.35  41      100
29      33      -40.2   -88.95  41      100
32      100     0       -48.75  99      100     23.1    WNLO-HD         23.2    Bounce
33      86      -8.4    -57.15  85      100     2.1     WGRZ-HD         2.2     WGRZ2.2         2.3     WGRZ2.3
35      72      -16.8   -65.55  42      100
36      90      -6      -54.75  57      100     36.1    CITS-HD
38      85      -9      -57.75  90      100     7.1     WKBW-HD
39      82      -10.8   -59.55  85      100     4.1     WIVB-HD
40      86      -8.4    -57.15  64      100     40.1    CJMT
41      98      -1.2    -49.95  71      100     41.1    CIII-HD         41.2    CIII-SD
43      96      -2.4    -51.15  98      100     17.1    WNED-HD         17.2    Think           0
44      88      -7.2    -55.95  77      100     57.1    CITYTV
47      92      -4.8    -53.55  78      100     47.1    CFMT
49      67      -19.8   -68.55  46      100     49.1    WNYO-HD         49.2    GetTV
 

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I think the dbg value just might be 10x the value for the newer units.

If I divide $15 by 10 on the output, the results look relatively sane.

(.14 * $15/10 + 58.8),"\t"(.14 * $15/10 + 58.8 - 48.75 )
see how this works out on ur hdhr4... Keep in mind I only had 77 samples to work with, but it does look pretty linear.

Code:
(0.00991 * [B]$15[/B] + 45.3),"\t"(.00991 *[B] $15[/B] + 45.3 - 48.75 )
Slope	0.0099156414
Intercept	45.2737590943
You could do this command to detect the hw version to decide which flavor of dbg= output to expect... and thus use that to
determine which formula to use...

~/src/TV_Stuff > hdhomerun_config 103AB6AA get /sys/model
hdhomerun3_atsc
 

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My model is hdhomeruntc_atsc, I replaced my 2 hdhr3 units with the transcode units.

Using those calcs, I get:

Code:
17 channels found
RF	Strngth	dBmV	dBm	Quality	SNR	Symbol	dbg	Calc_dBmV	Calc_dBm
--------------------------------------------------------------------------------------------
9	100	0	-48.75	98	32.34	100	-3475	10.8627		-37.8873
12	60	-24	-72.75	42	13.86	100	-6825	-22.3358		-71.0858
14	87	-7.8	-56.55	78	25.74	100	-5325	-7.47075		-56.2208
15	78	-13.2	-61.95	55	18.15	100	-5875	-12.9213		-61.6713
19	100	0	-48.75	85	28.05	100	-4525	0.45725		-48.2928
20	100	0	-48.75	98	32.34	100	-3725	8.38525		-40.3648
25	100	0	-48.75	100	33	100	-2775	17.7997		-30.9503
32	100	0	-48.75	100	33	100	-3375	11.8537		-36.8963
36	92	-4.8	-53.55	78	25.74	100	-5125	-5.48875		-54.2388
38	91	-5.4	-54.15	98	32.34	100	-5200	-6.232		-54.982
39	92	-4.8	-53.55	98	32.34	100	-5175	-5.98425		-54.7343
40	100	0	-48.75	100	33	100	-3550	10.1195		-38.6305
41	100	0	-48.75	98	32.34	100	-2775	17.7997		-30.9503
43	99	-0.6	-49.35	90	29.7	100	-4800	-2.268		-51.018
44	100	0	-48.75	100	33	100	-3350	12.1015		-36.6485
47	100	0	-48.75	98	32.34	100	-3450	11.1105		-37.6395
49	80	-12	-60.75	71	23.43	100	-5975	-13.9123		-62.6623
 

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looks pretty good to me, for the signals within 0-100 range.
How bout the strongest ones above 100% SS, are they looking about right relative to ur tvfool prediction, so on??

whats this output on urs??
hdhomerun_config 103AB6AA get /sys/hwmodel
HDHR3-US
 

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hdhomerun_config 105281ED get /sys/hwmodel
HDTC-2US

Some are close, some are off by as much as 10dB

ie:
channel_scan.sh reports:

Ch 19: Calc_dBmV = 0.45725, Calc_dBm = - 48.3

tvfool.com reports it as -37.8 dBm
 
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