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Anybody Test the New Channel Master CM-7778HD Dual Input?

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Old 10-19-2018, 07:25 AM   #1  
Sev
High Definition is the definition of life.
Thread Starter
 

Join Date: Oct 2005
Posts: 161
Question Anybody Test the New Channel Master CM-7778HD Dual Input?

The noise figure is very attractive.
Along with the built in LTE filter.

Amplify+ Adjustable Gain Preamplifier for Professionals (New)




Adjustable Amplification
Amplify+ provides adjustable settings that allow the installer to select the appropriate gain required for a specific installation scenario, eliminating the potential issues encountered from either too much or too little gain. The internal switch can be placed at either a High or Low setting.
Adjustable FM Trap
Amplify+ provides a trap mechanism to block unwanted FM Radio signals from FM-enabled commercial TV antennas, which can cause interference with UHF and VHF television signals. Pass-through of FM signals can be enabled or disabled via an internal switch.
LTE Filtering
Like the consumer-ready Amplify product, Amplify+ provides LTE signal filtering. The proliferation of LTE signal towers and connected LTE devices are a growing cause of intermittent disruption of over-the-air broadcast television signals. These disruptions can result in weak signals, pixilation or even channel loss, and can be especially disruptive when an amplifier is used with a TV antenna.

What’s Included
AMPLIFY+ TV antenna amplifier
Power inserter
Power adapter
Mounting Ubolt
(2) Mounting Screws
Weather Boots
Installation Guide

Features
Improves signal quality
Dual Antenna Inputs (VHF & UHF)
Switchable FM Trap
Decreases pixilation
May increase number of channels
Ultra low noise
Adjustable gain
Blocks LTE interference from 3G/4G Smartphones and transmitters
EMI & FM Out of band filtering
Heavy duty rating for outdoor use
Mast mounted for close proximity to antenna

Technical Specifications
Impedance (Input and Output)
75 Ohm
Connector
F-type
Frequency range
54MHz~88MHz, 174MHz~260MHz, and 470MHz~685MHz
Gain VHF
23dB (High) / 16dB (Low)
Gain UHF
26dB (High) / 20dB (Low)
Gain Combined
23dB (High) / 16dB (Low)
Noise figure
1.5dB

UL listed
Yes
RoHS compliant
Yes
Return loss
13dB
Operating temperature
-40 C to +60 C
Size (product)
3.25 x 5.25 x 7.75 in
Size (packaging)
8.125 x 3 x 5.125 in
Weight (product)
1.5 lb
Weight (packaging)
2 lb

Last edited by Sev; 10-19-2018 at 09:01 AM..
Sev is offline   Reply With Quote
Old 10-19-2018, 08:57 AM   #2  
It's the Antenna!
 

Join Date: Apr 2010
Posts: 929
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I mentioned the CM7778HD on another forum (A*V*S), and Calaveras did some measurements that show the Noise Figure is higher than claimed.

The rules of this forum do not allow me to post an active link to another forum.

#17219 my post
#17232 Calaveras
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Old 10-19-2018, 09:02 AM   #3  
Sev
High Definition is the definition of life.
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Join Date: Oct 2005
Posts: 161
Default

Quote:
Originally Posted by rabbit73 View Post
I mentioned the CM7778HD on another forum (A*V*S), and Calaveras did some measurements that show the Noise Figure is higher than claimed.

The rules of this forum do not allow me to post an active link to another forum.

#17219 my post
#17232 Calaveras
As always.
Thanks Rabbit.

Hope all is well with you.
Sev is offline   Reply With Quote
Old 10-19-2018, 04:48 PM   #4  
High Definition is the definition of life.
 

Join Date: Oct 2009
Posts: 1,218
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From what I've seen, CM seems to make a habit of exaggerating the noise figure of their amps and have for a number of years.
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Old 10-22-2018, 10:34 AM   #5  
Sev
High Definition is the definition of life.
Thread Starter
 

Join Date: Oct 2005
Posts: 161
Default

Quote:
Originally Posted by rabbit73 View Post
I mentioned the CM7778HD on another forum (A*V*S), and Calaveras did some measurements that show the Noise Figure is higher than claimed.

The rules of this forum do not allow me to post an active link to another forum.

#17219 my post
#17232 Calaveras
According to his testing it's NF is still lower than the AP-8700 I was using.
It has me wondering about the NF of all the other Winegards I have.
Sev is offline   Reply With Quote
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