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Discussion Starter · #21 ·
Installation Results

Here are the results of the installation of the new antennas. I replaced the stack of YA 1713's with a single Antennacraft Y10-7-13. At the 15 foot height off the roof a single Y10-7-13 has better gain and than either a single or stacked and phased YA 1713 setup. I added another five feet of height for a total of 20 feet off the roof which added another half db of gain. The Antennacraft antenna is also rejecting interference better as well.

After installing the Hollands FM filter I am still seeing interference though it is not as frequent as it was before with the YA 1713's stacked. After installing the Y10-7-13 I've found this antenna to be superior to the Winegard antennas. A single YA 1713 could not fully lock onto Ch. 7 while a single Y10-7-13 does and also rejects the offending interference better. I am no longer having any kind of complete dropouts of the signal either like before.

So, I don't know if that FM signal is the problem though or even a co channel 7. I am actually starting to think it might be something in the local area because the interference is generally not long lived and does not occur when skip on VHF channels is present. It would make sense if a co channel 7 was causing problems at a time when other VHF skip is present but that is not the case. It also seems to occur at nearly the same intervals of time during the day. This is not a constant problem. The signal drops a few DB and the interference kicks in and then it vanishes the signal is back to its normal strength here.

At this point I can live with the current quality of the picture. The signal is fine during the time of day when I do watch Ch. 7. The only time the interference is happening now is when is a few minutes here and there during the mid day when I am not going to be watching.
 

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The only time the interference is happening now is when is a few minutes here and there during the mid day when I am not going to be watching.
Yeah, that sounds like mid day fading and the only solution for that is raising or lowering the antenna to compensate.

Is the Y10-7-13 at the same height as were the YA 1713s ?
 

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Discussion Starter · #23 ·
300ohm. Initially I mounted the Y10-7-13 at 15 feet just like I had initially with a single YA1713. At that height the Antennacraft was able to lock onto the signal with a watchable signal with less interference. I then added another five feet for a total of around 37 feet off the ground or 20 feet above the roof and this improved the signal by another half DB or so.

The stack of YA1713's were at 11 feet and 15 feet respectively minus a few inches per the advice of a Tech at Winegard. While this did improve the gain the interference was still pretty bad a lot of the time and I would have at least a couple of complete dropouts of the picture every day since this problem started to rear its ugly head in April.
 

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There are only a few DTV stations broadcasting either Circularly (CP) or Elliptically (EP) Polarized signals:
http://www.rabbitears.info/oddsandends.php?request=polarization&type=C
http://www.rabbitears.info/oddsandends.php?request=polarization&type=E

Rotating an antenna to take advantage of the Vertically Polarized component is only viable for these stations,
and will, of course, probably lose the remaining stations still broadcasting Horizontal ONLY signals.

The best for BOTH would be a Circularly Polarized Antenna: suggest you use the SEARCH feature....
 
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