View Single Post
Old 14-Jul-2017, 1:20 PM   #12
rabbit73
Retired A/V Tech
 
Join Date: Aug 2012
Location: S.E. VA
Posts: 2,747
You have a problem location with channels in different directions, trees in the signal paths, and a very strong local signal that is already in the overload category. The ideal solution would require multiple antennas and filters, but a simple solution might work with a little experimentation.

I suggest an Antennas Direct C2V, aimed at about 270 degrees magnetic to favor NBC and CBS. Fox is in a different direction, but it might come in. The VHF dipole for the C2V should be able to pick up PBS.

My biggest concern is with WICD that is so strong it will prevent the reception of the weaker channels, as you have already experienced with your indoor antenna. It is, unfortunately in the same general direction as your other channels, so a directional antenna probably will not help, unless you are willing to experiment further, to place WICD in a null in the antenna pattern to make it weaker.

If you are not willing to do that type of experiment, then you will probably need a custom filter from Tin Lee Electronics to make WICD on real channel 41 weaker. WICD will be moving to channel 32 in a few years, so you would have to order another custom filter.
http://www.rabbitears.info/market.ph...&callsign=wicd

WICD has a Noise Margin of 77.3 dB, even before adding antenna gain.



Interpreting Noise Margin in the TV Fool Report
http://www.aa6g.org/DTV/Reception/tvfool_nm.html

This might work:



The narrow beamwidth of the 91XG will make WICD a lot weaker, but it has more gain than necessary. Insert an attenuator in the coax of about 10 or 15 dB to keep WICD weak without making NBC too weak.

If you need WILL PBS, add an MCM 30-2475 VHF antenna aimed at 272 degrees magnetic. Combine the two antennas with a UVSJ.
Attached Images
File Type: jpg corson6TVF91XGpattern.jpg (172.7 KB, 2931 views)
__________________
If you can not measure it, you can not improve it.
Lord Kelvin, 1883
http://www.megalithia.com/elect/aeri...ttpoorman.html

Last edited by rabbit73; 14-Jul-2017 at 6:01 PM.
rabbit73 is offline   Reply With Quote