[TMC] TMC CU-70 Directional Coupler Alignment Procedure???

[John Vendely]

Bruce,

The alignment procedure is shown in the manual for the SWR-1K.  I recall 
the procedure is the same for 50 and 70 ohm versions, except for 
termination impedance and load voltage, and includes the procedure for 
setting the equalizer and null capacitors, plus pots in the metering 
circuitry external to the coupler.  There's adequate service information 
in the manual for you to deduce all that's needed for internal repair of 
the coupler.  I've repaired several of these couplers over the years, 
and it's fairly simple, except for the aggravation of dealing with a few 
components inconveniently haywired inside the tubular film-on-glass 
resistor.

73,

John K9WT

On 4/16/2011 7:42 PM, triodes at optonline.net wrote:
> Is anyone here on the reflector aware of the procedure for aligning the CU-70 Directional Coupler unit, as typically used with the TMC ATS-2 or SWR-1K, etc?
>
> I have a CU-70 (the 70 ohm variant) that I would like to realign for use with a 50 ohm transmission line. The CU-50 (the 50 ohm version) and the CU-70 are of identical configuration; the only difference is in the test and alignment procedure. Unfortunately, the TMC maintenance philosophy for the CU-50 and the CU-70 was they were factory-repairable only, and as such, and to the best of my knowledge, TMC never published the alignment information for these units in any of their technical manuals.
>
> The CU-series are very simple units with only two adjustments ("equalizer" and "null") on them, but before I touch the unit, I figured I would inquire here first.
>
> Thanks&  73,
>
> Bruce, W2XR
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