[Racal] Ra6790 repairs

[Ed Tanton]

Wow Tom!!! Nice work!!!

At 03:31 PM 2006-03-12, tfrobase wrote:
>I have had an intermittent problem with my 6790 for a while.  Poor sync and
>a lot of noise on anything that required cw including SSB and then last week
>the tuning encoder quit.
>
>I found a bad LM339 in the encoder circuit, took the front panel apart
>replaced the chip, put all back together and it still didn't work.  Tore it
>apart again and then I triggered the scope from the encoder buffer to the
>processor buss and found the cmos buffer was also bad.  Once I had that
>fixed my intermittent problem kicked it, I found it was a noisy pot on the
>723 regulator on the A7 board, go figure.  Back in the console working like
>a champ.  Food for though for others ... 73, tom N3LLL
>
>
>
>Thomas L. Frobase
>League City Texas 77573
>
>
>_______________________________________________
>RACAL mailing list
>RACAL at mailman.qth.net
>http://mailman.qth.net/mailman/listinfo/racal

72/73 Ed Tanton N4XY <n4xy at earthlink.net>
----------------------------------------------------------
Reflector Manager For:

[NoGaQRP]          [Argonaut Users Group]
[CW] [EICO] [JPS] [JRC] [MIZUHO] [SBE]
[JOHNSON] [RACAL] [TMC]  [WINRADIO]
[TMI-RFI-EMI]  [Ham ELMER]   [PACTOR]
----------------------------------------------------------
Ed Tanton N4XY
189 Pioneer Trail
Marietta, GA 30068-3466

website: http://www.n4xy.com

All emails <IN> & <OUT> checked by
Norton AntiVirus with AutoProtect

LM: ARRL QCWA AMSAT & INDEXA;
SEDXC NCDXA GACW QRP-ARCI
OK-QRP   K2 (Field Tester) #00057

--------------------------------------------------
"Right is right, even if everyone is
against it; and wrong is wrong, even
if everyone is for it."

William Penn
--------------------------------------------------