[Milsurplus] RF Communications Antenna Coupler

[Normiehall@aol.com]

Hi listers,

I picked up an interesting antenna coupler a couple of days ago.  It is an RF 
Communications Model SB-6CMA, serial No. 191.  

It has an SO-239 UHF chassis mount coax fitting "52 Ohm input from 
transmitter," an SWR/Power meter, two E. F. Johnson roller coils with very 
nice dials and a very heavy duty ceramic switch that switches in ceramic caps 
in series with an antenna post or shorts them out and switches caps from the 
antenna post to ground.  The coil with higher inductance (#229-201) is in 
series with the lead to the caps and antenna and the lower inductance 
(#229-201-5) shunts the output of the SWR sensor to ground.  The coil dials 
are marked "Tune" and "Load" and the switch is marked "Megacycles" and has 
ten positions "A" through "J."  A previous owner included a paper with coil 
and switch settings for 3885 KC and 7250 KC.  

Does anyone have a manual or schematic for this unit or know what equipment 
it was used with, power level, frequency range, expected antenna (whip or 
long wire)?

It is a very nicely built unit.  Any help appreciated.

73,

Norm Hall, W6JOD


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