[GreenKeys] Military TUs

[Roy Morgan]

At 02:16 PM 3/7/2007, David Freeman wrote:
>Gentlemen,
>
>In general, of the military demodulators, which is deemed the best?
>Do any of them hold a candle to a HAL or a Dovetron?
>And specifically, is the CV-116C/URR a "good" one?
>(see eBay item #250090826922)


Ah, our friend RadioMart again!

It appears that the ears or rails that allow for rack mounting are missing.

These things are two-channel terminal units from an era duriing or before 
the R-390A.. (The CV-115 is one channel.) This thing may well weigh close 
to a hundred pounds.

They operate on the IF output from two receivers, and are slope-detecting 
systems. That is, they have a discriminator circuit that puts out a voltage 
that varies with frequency. Here is a message from my notes file on them:

>From: wjneill at lcc.net wjneill at lcc.net
>Date: Thu, 23 Jun 2005 11:32:02 -0400
>To: RLucch2098 at aol.com
>Subject: RE: [R-390] Anyone Know about this FSK device & Value?
>
>The CV-116( ) came in three versions:  original, "B", and "C".  It is a
>dual-diversity device that operates from the IF output of the R-390( )
>and is used to convert radio-teletypewriter signals from two receivers
>into a teletypewriter signal (with required loop current) that will operate
>a conventional teletypewriter.
>
>Dual-diversity refers to a radio signal received by two separate
>receivers and the exact same signal is transmitted either on two
>separate frequencies or on the same frequency and the two separate
>receivers also use two separate antennae, spaced at least 600 feet
>apart, to receive the same signal.
>
>For the military, the CV-116( ) was used variously as a component of
>radio sets AN/GRC-26D, AN/MRR-8, or AN/FRR-38.
>
>I am currently running three CV-116( )'s.
>
>If you have additional questions, please ask.


I would expect this thing to operate moderately well if twiddled enough and 
with strong signals, but a Dovetron can be expected to run rings around it 
in difficult situations.

Roy
who has a CV-115 but no manual for same



- Roy Morgan, K1LKY since 1959 - Keep 'em Glowing
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