[TMC] ATS-2 problem

[John Vendely]

Hi Hal,

Yes, those components are inside R301.  R301 is a film on glass type 
resistor, and the internal components can be accessed by removing the 
resistor assembly, and carefully pulling off the end caps.  The caps have 
fingers which engage the plated ends on the resistor.  The components are 
simply "haywired" together inside, and it's a bit of a pain to work on.

There's not much to go wrong with these units, so I'd recommend simply 
ohming out the RF chokes, checking the diodes (be careful about forward 
current), and carefully inspecting everything.  They're simple to work on, 
though getting at the parts inside R301 is a chore...

73,

John K9WT


----- Original Message ----- 
From: "H.L." <hl at sfsu.edu>
To: <TMC at mailman.qth.net>
Sent: Monday, September 07, 2009 7:25 PM
Subject: [TMC] ATS-2 problem


>
> 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
> ______________________________________________________________
> TMC mailing list
> Home: http://mailman.qth.net/mailman/listinfo/tmc
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:TMC at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>