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The filters are homemade but are definitely working. The RCA converter can't detect the weak stations at all without one. I made one more 5-pole just to try it. I am limited in location options but I have moved it all around the area shown. It is about 3 ft. closer to the metal pipe. Quote:
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When I was looking around, I came across this In-line amplifier. Could this be used as a preamp if the antenna is much better than what I have? |
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http://www.tvfool.com/?option=com_wr...f1f05778a90214 Quote:
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-27.5 dBm = 21.5 dBmV Max input of the Tru-Spec LA-10 10 dB Coaxial IN-Line Amplifier = 14 dBmV http://www.atvresearch.com/specinfo/la-10.pdf |
I just wanted to post a quick update. I ordered a USB software defined radio so I can compare all of the signals at once. I'll also see if there's anything else I may not know about that could cause interference. I am also going to try a coat hanger antenna without a reflector just to see what happens. In the meantime, we have been watching WLPX-ION, CH39 which is 46th on my TV fool report at NM -39dB. Go figure.
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Well, since I have multiple threads going, I'm not sure where to post this. I got the SDR configured with RTLSDR scanner and found a surprise, but not a good one. It's a land mobile radio service on the same tower. Note, the FM stations are attenuated by 2 filters and a small amplifier is inline. I think I have to rethink my high pass filter. The calculated cutoff is 160MHz. I'm also including the FM band with no filters for comparison.
http://forum.tvfool.com/attachment.p...1&d=1464368311 http://forum.tvfool.com/attachment.p...1&d=1464368749 |
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I'm back with an update. I now have a 4-bay M4 10x9.5 with a flat reflector. I have monitored my reception for a few days and it is much better with this antenna. One thing that still puzzles me is the fact that traffic and parked cars affect my reception. That means part of my signal is reflected from the street surface, right? I also have the huge hill that prevents LOS reception. I'm wondering if a slight tilt toward the top of the hill would help? By the way, here is what I am receiving on UHF. Note that CH26 is not the strongest channel because the antenna is not pointed that direction but that is constantly varying.
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Thanks for the updates, Chris. Your SDR is almost as good as a spectrum analyzer at finding interference to your TV reception. Is that signal at 152.48 MHz the land mobile? You do need to rethink a high pass filter, because a HLSJ isn't going to take it out. Maybe a coax stub and a "T" adapter can attenuate it enough.
I think you should also post your images on your AVS thread: http://www.avsforum.com/forum/25-hdt...nton-ohio.html Quote:
http://forum.tvfool.com/attachment.p...0&d=1465172701 |
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I was looking at this site and the section on Ground Reflection explains a lot. Sometimes the ground reflections help and sometimes they hurt. They also vary with frequency. This graph shows what CH 41 (red arrow) looks like when I can't receive it.
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