[Milsurplus] Whatizit? CU-168/FRR?

[David Ross]

Ken & the gang -

  Ken asks about the CU-168...

"Kenneth G. Gordon" wrote:
> 
> Antenna coupler. For general radio use. Has 5 "N" connectors
> coming out of 5 separate boxes and a built-in power supply.
> 
> What is the frequency range? Would it work well at VLF or is it only
> for HF? Are there pre-amps in it? How good is the separation
> between receiver outputs? Where is the antenna input? Is it worth
> anything? It is NIB, but no manual.
> 
> I would like to use it with my MF and VLF receivers on a single,
> low-noise, active antenna for receiving.
> 

  It is rated for 2-30 MCs, 70 ohm ins & outs.  Mine is pretty flat from
5-30, but is about 3db down at 2 MCs and falls off pretty bad at .5 MCs.

  Unique circuitry, all push-pull amps inside the unit.  Each of the
five channels has a push-pull cathode follower stage driving a push-pull
grounded grid stage -  all four grids at DC ground and all four cathodes
at the same DC potential.
  (Oops, make that eight grids & eight cathodes -  all tubes are doubled
up with each of the two stages having a parallel push-pull arrangement. 
Each of the five amplifier modules contains 4 dual triodes.)

73
Dave Ross    N7EPI    ross@hypertools.com