Signal Amplifiers (Amps, Preamps, Distro Amps) - Page 291 - Canadian TV, Computing and Home Theatre Forums

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post #4351 of 4354 (permalink) Old 2019-11-19, 02:33 PM
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Join Date: May 2011
Location: Mont-St-Hilaire
Posts: 29
Mont-St-Hilaire : Replacement preamp needed ? If yes, which one?

Dear All,

I have an Antennas Direct DB8 with a Channel Master CM-7777 30 dB, 1 input, 15V
Inside the condo, the signal is split to three receivers through an Extreme Broadband BDS103HB -5.5dB

Problem
I believe the preamp has died on me because I can't get any signal as of a few days ago.
I checked the PSU and it is reading 14,6V
I checked the current draw and it is reading around 185 mA.




https://www.rabbitears.info/searchma...study_id=29107


I am not the one who installed the rig on the roof. A professionnal (???) did it as membrane roof, side flashing and bricks were involved.

The antenna is pointed toward 165° (true azimuth) for maximum signals for the channels at about 75 miles from my location (Burlington's towers). Also, the closest channels are at about 20 miles (Montreal's Mont-Royal's towers) and located at 259° (true azimuth).

I used to get those channels: 2.1, 10.1, 6.1, 12.1, 17.1, 15.1, 3.1 (real 20 WCAX), 62.1, 5.1, 33.1, 44.1
I never got WVNY (22.1) but would be happy to.

First
Apart from the PSU voltage reading and the current draw reading, should I do anything else to confirm the CM7777 is dead?

Second
If the CM7777 is dead indeed, can anyone point me at a replacement?

Thanks

Last edited by Burette; 2019-11-20 at 12:23 AM. Reason: better image
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post #4352 of 4354 (permalink) Old 2019-11-20, 10:11 PM
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Join Date: Apr 2019
Location: Sherbrooke, Qc
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I have both CM7777, the old beige brick power supply model with separate VHF/UHF inputs and RCA TVPRAMP1E. They are very similar. For the price, the TVPRAMP1E is not a mistake.
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post #4353 of 4354 (permalink) Old 2019-11-26, 04:00 PM
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Location: Kitchener, ON
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If these preamps fail or aren't receiving power, they effectively become a strong signal attenuator. Check all of your connections and connectors. The preamp requires continuity on both the centre conductor and the braid which covers the dielectric and runs below the coaxial outer skin. Ensure this braid is making good contact with all F connectors.

Roof-top mounted Antennas Direct DB8e & C5, Channel Master 7777 preamp, Siemens surge protection. TiVo Roamio DVR
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post #4354 of 4354 (permalink) Old 2019-11-26, 04:09 PM
 
Join Date: Mar 2007
Location: Windsor
Posts: 81
At this point Channel Master Preamps are backlogged into the new year due to the production move and the release of the V3

An alternate might be the Winegard ANLNA200 if you need something immediate
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amplifier , dtv , ota , preamp , signal strength

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