Measurements: The CM-7777 has only one input. I used an OTA signal, no t on the same day. I measured before the pre-amp one day and after the power injector (about 3
0') on another day. Cable is copper clad RG6QS. Measured with a Sencore SLM
1453i
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These measurements were don e before the re-assignment of channels.
The measurement is problematic because of 1) Tilt and 2) different days.
"Evaluation of a Winegard HD8200U Antenna with a Channel Master CM-7777 30 dB mast mounted Preamp" FM trap is enabled in the antenna pre-amp. May 2019 Voltages in Columns C and F are in dBuV Gain is just Column F minus Column C @antenna (N3) @In Attic (N4) Gain(N5) 2 53.6 73.5 19.9 3 42.4 58.0 15.6 4 47.5 67.5 20.0 5 29.9 54.1 24.2 6 59.5 80.6 21.1 7 Fail 37.4 Fail 8 16.1 Fail 41.6 Fail 9 22 Fail 38.1 Fail 10 * * 46.5 Fail 11 * 39.4 Fail 12 36.7 58.4 21.7 13 * * 35.0 Fail 14 * * 28.5 Fail 15 * * 29.2 Fail 16 * * 31.6 Fail 17 * * N5 49.2 18 * * 27.7 Fail 19 * * 39.5 Fail 20 * * 28.9 Fail 21 27.6 Fail 27.6 22 43.4 63.6 20.2 23 * * 25.9 Fail 24 * * 28.4 Fail 25 * * 34.3 Fail 26 32.2 55.2 23.0 27 * * 29.2 Fail 28 * * 27.6 Fail 29 * * 25.8 Fail 30 * * 26.8 Fail 31 21.2 48.7 27.5 32 32.3 56.7 24.4 33 * * 30.1 Fail 34 34.4 * 56.0 21.6 35 * * 27.4 36 * * 30.2 37 * * 30.7 38 * * 39.0 39 * * 28.7 40 * * 33.1 41 * * N1 31.2 42 U U N6 55.5 43 * * 31.3 44 U U N7 Missed a few here, "I think the reason for the * @antenna is that the Sencore didn't find any thing Using 8VSB modulation. Not sure."
TVFool data from Highest to lowest NF
6 (6.1) ABC NM: 42.6db Pwr -48.2dbm 2Edge, 28.8 miles ...
42 (29.1) Fox NM: 21.5 Pwr: -69.4 2Edge, 28.9 miles
On one TV using a converter box, it shows 29/100 for signal strength on it' s internal meter for 29.1 and 91 for channel 6.1. This includes another am p at 35 feet (unknown gain) from the 7777, then 65 feet to a 2-way splitter and about 35' to the TV.
The "stupid" Samsung "Smart TV" only shows s/n ratio. I do have a "tuner" that will show both in real units.
The system is/will be: Mast amp (currently CM-7777, plan to change to a Kitz lower NF amplifier)
30'; RG-6QS copper clad Power injector in attic Variable 0-18db gain amplifier using an attenuator
65'; RG-6QS copper clad to basement; About 40' to each TV location (some le ss, some more)
Currently: A 2-way splitter to two TV's about 40' away.
Planned: Blonder Tongue BIDA 75-43a (30-45 db Gain with tilt compensation cards and variable) that replaces a Tin Lee amplifier four 24 db 4-way taps to 12 locations (existing, but not currently used bec ause of a broken amplifier) Locations are around 40' away.
The gain is unknown because the AMP and attenuator WAS prior to the 2-way s plitter and it was recently moved to the attic as is. performance is defin itely better.
My main distribution amp died and I'm planning to replace it with a Blonder
-tongue BID 75a-43 for 12 locations fed by four 4-way 24 db taps.
This has available various "tilt cards", but might consider a custom VHF at tenuator. I think the CM-7777 might overload with cellular signals.
Why copper clad? Friends that were in the satellite TV industry gave me 10
00 feet.