Greetings Christoph,
I also experienced the problem you have described when I obtained my
SDR-ATU and installed it in the SDR-1000 in May 2005. My version of the
ATU did not contain the red and green LED's which indicate the status of
the ATU. After several exchanges with Gerald Youngblood, he advised that
several of the early ATU Z-100's obtained from LDG were assembled without
the addition of these LED's. This I corrected by obtaining the LED's from
Gerald at Flex-Radio and installing them on my ATU unit.
In order for the ATU to function correctly, you must be using PowerSDR
verion 1.4.5 Beta 6 or later due to a software bug discovered in the
earlier versions of software. What indication on the RED and GREEN LED's
are you observing when you tune the SDR?
The problem that I eventually discovered was a solder bridge short on the
bottom of the 100W Amp board at the point of the ATU jumper pads. I read a
.2 ohm short with the jumper cut and should have read infinity on my
digital ohmmeter. I discussed this discovery with Gerald from Flex-Radio
and we concluded that a short must exist, Gerald advised the procedure for
removing the 100W amp from the SDR case and removal of the printed circuit
board from the Amps heat-sink. Upon performing this disassembly I found a
blob of solder bridging the jumper pads on the bottom of the 100W Amp
circuit board. I removed the solder bridge and reassembled the AMP circuit
board with the heat-sink and remounted the Amp in the SDR radio
cabinet. The ATU then performed flawlessly when tested subsequent to this
troubleshooting and correction.
I am presently on Holiday at my future retirement home in Florida until
after Christmas, after which my spouse and I return to the U.K. and resume
work.
Advise if I can be of additional assistance in troubleshooting your ATU unit?
73's, Wally - M0ZAZ.
At 09:12 PM 12/4/2005 +0100, you wrote:
My ATU is not working properly: I hear the relays but when finished, there
was
no tuning. Is there a way to test the ATU manually or is there a
toubleshooting
procedure? I am using the sdr-100O with 100W and ATU installed, purchased in
September 05, Delta44, v1.4.5 Beta7. Actually it never worked until now,
was not
sure from the readings if I still should wait for updates(?).
Chris, HB9AJP
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