The amplified OTA antenna that's on my RV is pretty much useless unless I'm camping in Walmart parking lot..I currently have a 30ft flagpole mounted on the rear that I'm upgrading to a Rohn 9h50 telescopic mast and want to add a decent lightweight antenna with a Pre-Amp..I would like to use the current booster power switch that's in the camper but I'm not sure what pre-amps will work with 12volt power..I know the CM-7777and 78 use 15volt..Winegard is 5volt power supply..Will the Channel Master work with 12.8 volts?Any ideas?
Here is a link to an old troubleshooting page for the CM7777 from the Channel Master site that has been saved on the Wayback Machine.
Verify all connections are correct and tight Antenna output goes to the INPUT port on the preamplifier Connect the coaxial cable going into the house to the OUTPUT/POWER port on the preamplifie...
web.archive.org
Step 8 states that as long as the voltage is
above 12VDC it should work. Of course there are many variables such as length of coax run, lower input voltage may reduce efficiency, etc.
And here is a link to the current page from their site which states the CM7777s are now shipping with 12 VDC power supplies.
Preamplifier Connections and Voltages for the CM-7777v3, CM-7778v3 & CM-7778HD The following is the sequence to connect the CM-7777v3, CM-7778v3 or CM-7778HD into your system. Your Antenna>S...
support.channelmaster.com
So it really depends on how old your unit is. I guess the only way to know for sure is to try it in your situation and see. If it is the older model you could also try stepping up the voltage to the expected 15 VDC with something like this if it won't work properly with straight vehicle power.
Amazon product ASIN B00J03PBW0