[TMC] ATS-2 problem

H.L. hl at sfsu.edu
Mon Sep 7 19:25:37 EDT 2009


Hello All:

Help!  I just acquired a very nice ATS-2 unit, consisting of the 
SWR/Wattmeter monitor/meter (Model MCU-2), the antenna coupler 
(CU-2/70) and the matching vertical antenna tuner.  I think parts are 
missing from the antenna coupler, but am not sure. If anyone has the 
coupler handy for inspection, I would appreciate if you would compare 
your coupler with the photo of mine on webpage:

http://online.sfsu.edu/~hl/ATS2.AntCoupler.html

As shown, I cannot find the two diodes, CR301 and CR302, two RF 
chokes, L301 and L303, and two capacitors, C303 and C306. Are they 
all hidden inside R301? The meter's two needles operate fine when 
tested (carefully) with a VTVM set at high scale. The coupler seems 
to work properly with the meter in providing a FORWARD Watts reading, 
but it does not give any REFLECTED reading at all. I know my SWR is 
not THAT good!

When I reverse the hookup--as recommended in the manual for zero 
adjustments, neither needle indicates a reading as if the transmitter 
has no output.

Any suggestions will be appreciated.

73 Hal KK6HY
email: kk6hy at arrl.net


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