Question 1

With my hdb91x  antenna plus the cm-7777hd from savannah i do receive charelston and jacsonville. how do i keep them with no fading away.

Accepted Answer

1.factors  to consider: wooded area, valley, out door antenna....attic area....mine is in the attic
2. I have 2 units one at the antenna and  and another that connects to the cable outlets to the TVs ...very little problems prior to that I was having the same problem...also check on line for best  antenna direction(use compass for station signals) you'll  need two people ...one for antenna adjustment second person to view best reception for your channels use cell phone ---walkie talkies---loud voice...better known as a " big mouth"...its trial and error...you'll eventually set it right...its take time ....so be patient...once you locate the right spot you will know....if then the is some disturbance...then just tweak it....good luck
Just nto let you know my is working great...I have 5 tvs

Question 2

Can i use this preamplifier (cm-7777hd) and the ultra mini 2 distribution amplifier (cm-3412) same time?

Accepted Answer

Yes you can! That is what I had to do to get a strong signal to all of my TVs. I would buy an extended warranty with both items. The warranty sucks and mine died right after it was over. Now I have a new one with a Square Trade warranty just in case this one dies early too.

Question 3

Can I use this on a antenna that’s already amplified?

Accepted Answer

Yes, but you run the risk of overloading the front end of your TV receiver.  That could lead to damage or a poor picture.  If your TV can display the received signal strength from your antenna, check the signal strength before installing the CM-7777HD.  If you see two or three bars out of 5, you can try the CM=7777HD on low amplification and immediately test the received signal strength again.  If you see 3 or 4 bars you are good.  If you see 5 bars you may be ok.  I have my CM-7777HD installed at the antenna.  I use a splitter to serve two TVs and have a second amplifier installed on each leg after the splitter.  Hope this helps.

Question 4

This pre amp keeps loosing power green led shuts off no signal unplug power insertion plug back in works 10 to 20 minutes this is a new unit anyone ha

Accepted Answer

Return it. I purchased one along with a Channel Master 100 directional outdoor tv antenna long range CM3020, and struggled with it for a week all the while communicating with channel master. Still received only PBS station lost 29 channels. Finally removed it and plugged old radio shack preamp and tada! Recovered 29 channels.

ASIN	B01FTX7M26
AntennaDescription	Television
Best Sellers Rank	#120,144 in Electronics ( See Top 100 in Electronics ) #256 in Audio/Video Receivers & Amplifiers
Brand	Channel Master
Built-In Media	TV Antenna
Color	Charcoal
Customer Reviews	4.2 4.2 out of 5 stars (1,871)
Global Trade Identification Number	00020572177771
Impedance	75 Ohms
Item Dimensions L x W x H	5"L x 2.25"W x 1.25"H
Item Weight	12.5 Ounces
Manufacturer	Channel Master
UPC	020572177771
Warranty Description	120 days

Channel MasterCM-7777HD TV Antenna Amplifier with Adjustable Gain

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