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Old 25-May-2015, 2:47 PM   #6
rabbit73
Retired A/V Tech
 
Join Date: Aug 2012
Location: S.E. VA
Posts: 2,753
Quote:
Well darn, this has not been going nearly as well as I had hoped.
Sorry to hear that you are having problems. You have done a good job of trying different spots for your C2V.
Quote:
I have a balcony on the 2nd floor that may give me some mounting options for an outdoor antenna. I would lose some height though, and gain a tree in the way, so I am not certain if that would actually be a benefit.
I think the trees are messing with your signals, sort of like looking through lace or gauze.
http://www.avsforum.com/forum/25-hdt...-part-1-a.html
His trees in attachment 2

I'm having difficulty following your description of channels received, because they are listed in different ways on your tvfool report: by call sign, by real channel number, and by virtual channel number.

Quote:
most often channel 2, which I don't entirely even think makes sense if I'm understanding which frequencies are closer to each other.
The real channel number is what the transmitter uses, and determines the antenna needed. The virtual channel number is a holdover from the analog TV days, and the stations wanted to continue to use it for viewer identification. Sometimes they are the same, sometimes not.

VHF-Low, real channels 2-6 (not used much anymore)
VHF-High, real channels 7-13 (the "V" dipole attachment of the C2V)
UHF, real channels 14-51 (the double loops of the C2)

To avoid confusion just use the number for the real channel number, but add the decimal point or a dash for the virtual number. Some examples:
KGW NBC, real channel 8, virtual channel number 8.1 or 8-1

When you say 49 do you mean KWVT real channel 49, virtual channel 17.1, or do you mean KPDX real channel 30, virtual channel 49.1? My guess is you mean KPDX.

When you say channel 2, I don't see it listed on your report. Do you mean KATU ABC real channel 43, virtual channel 2.1?

In order to sort your channels out, I used this listing for your zip at rabbitears.info:
http://www.rabbitears.info/search.ph...pe=dBm&height=

Since you are having some trouble, I decided to dig a little deeper. When you were testing your first two antennas, you said a preamp helped. I wondered if you could use a preamp with the C2V, but according to the tvfool report your signals are already strong. The Noise Margin for KGW is +54.6 dB.



I then wondered about strong local FM signals that might cause interference to your TV reception, especially real channels 8, 10, and 12. I did an FM FOOL report using your zip code, and the strongest FM signal was +7.7 dBm, at 0.4 mi away!

I then did an FM FOOL report based on your estimated location derived from your tvfool report which gave -4.3 dBm at 1.1 mi; still extremely strong. I think an FM trap/filter, or 2 in series, between the antenna and the tuner would help, and they are not very expensive.
http://www.mcmelectronics.com/produc...-FM-88-/33-341

https://www.antennasdirect.com/store...on_filter.html

It seemed to help another Tivo user:
http://archive2.tivocommunity.com/ti...d.php?t=270549
Attached Images
File Type: jpg dovienyaTVF FM2.JPG (116.2 KB, 1074 views)
File Type: jpg ChuckTrees (2).jpg (187.0 KB, 1102 views)
File Type: jpg NMChartC.jpg (71.3 KB, 2036 views)
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Last edited by rabbit73; 25-May-2015 at 11:13 PM.
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