Hello Wally,
when hiting TUN the carrier gets on (10W), then comes the red led and after abt
1s the red goes off. After a fraction of a second the red geos on again while
the relays start clicking. After abt 1s the green led starts to flicker. Then
the relays stop clicking and at the same time the red gets off and the green
stays on permanently. Then the carrier gets off and after a fraction of a second
the green led gets off. During the whole time the VSWR stays unchanged (e.g.
1:3) and the power meter moves a little bit. So I guess the behaviour of the
tuning cycle seems to be ok but still it does not tune. (I also located and
checked the jp1 jumper pads: the resistance reads infinity). Any suggestions?
73 Chris, HB9AJP
Wallace Watson schrieb:
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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