OTA Clone, Coat Hanger, and Junk Antennas - Page 17 - Canadian TV, Computing and Home Theatre Forums

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post #241 of 243 (permalink) Old 2016-04-12, 04:13 PM
Join Date: Nov 2008
Location: San Diego, CA
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YUP, your Engineer is realizing that it only possible to slightly attenuate the CELLPHONE to TOWER signals on 704-716 MHz, cuz they're too close to Ch51 top band-edge (698 MHz), which should NOT be attenuated more than say 1 dB. The BEST that can be done with an LTE Filter is to get rid of the TOWER Broadcast signals on 734-746 MHz (and another higher band) in North America:
Severe OTA Interference From New Digital Services Tower

Max Output Level: 118 dBuV
Need to ALSO specify TEST CONDITIONS, such as either per DIN45004 (A or B or C?) Test Procedures or whatever alternative test is used. Typically the reported OUTPUT voltage value is for either TWO EQUAL Strong Signals [or one x dB stronger than the other] while adjusting the input level so that the 3rd Order Intermod Frequency (for example 2F1-F2) is y dB [46 dB or 60 dB are typically used] below the Strongest Output Signal.

Antenna Simulations, Overload Calculations, etc: http://imageevent.com/holl_ands
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post #242 of 243 (permalink) Old 2017-02-19, 06:54 PM
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Seen this commercial on TV a few times: https://www.youtube.com/watch?v=A9K3kQeji4E

Might be an okay solution for someone living in NYC or Los Angeles, but anywhere else? lol
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post #243 of 243 (permalink) Old 2017-02-20, 02:12 PM
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Location: San Diego, CA
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I've seen numerous TVFool Reports [perhaps 1 in 5] where $28 Clear TV Key's Vertical Monopole Antenna mounted directly to DTV's Coax Connector would pick up STRONG, LOCAL Stations....some only need an "UNFOLDED PAPER CLIP ANTENNA"...which might even be BETTER than the Clear TV Key, as discussed below:
Watch broadcast TV FREE with Clear TV Key HD Digital Antenna | Clear TV? Key


1) Although Clear TV Key Antenna may pick up Stations with either Circular [Vertical = Horizontal Power] or Elliptical Polarization [typically LESS Power in Vertical Component], it is VERTICALLY Polarized, while MOST DTV Stations [out of 1797 in RabbitEars Database] are ONLY Horizontally Polarized and will probably NOT be received unless significant De-Polarization occurs during SOME Reflections [unlikely in most cases]:
RabbitEars.Info[List of 159 Circularly Polarized DTV Stations]
RabbitEars.Info[List of 374 Elliptically Polarized DTV Stations]

2) It only provides 0 dBi Gain on SOME UHF Channels which is insufficient to pick up even moderate Range Stations,

3) With much less Gain and Excessive SWR on VHF Channels,

4) It's HIDDEN behind all of that conductive Metal in the DTV which acts as a Reflector, blocking signals from a very wide Angle [more than 180-deg]...although it provides some Gain Enhancement for Stations located on the Backside of the DTV.

Even an Inexpensive 1-Bay Bowtie would make a MUCH better UHF and even Hi-VHF Antenna for Strong, Local Station Reception of HORIZONTALLY Polarized Signals......although I know of several BETTER Bi-Directional [for signals from nearly ALL Directions] Indoor Antennas [incl. UHF-Loop + VHF-Rabbit-Ears]:
UHF Bowties - NO Reflector
Product Reviews Archives - HDTVexpert

More INDOOR Antenna Comparison Tests are found here:

Antenna Simulations, Overload Calculations, etc: http://imageevent.com/holl_ands

Last edited by holl_ands; 2017-02-20 at 02:59 PM.
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