Yes, the diodes are used to program counter presets for the various
bands. Also, I had a leaky bypass capacitor on the counter board that
caused erroneous readings.
Dr. Gerald N. Johnson wrote:
> -------- Forwarded Message --------
>> From: firstname.lastname@example.org
>> To: email@example.com
>> Cc: firstname.lastname@example.org
>> Subject: Ten Tec archives
>> Date: Thu, 11 Jun 2009 11:47:28 +0100
>> Good morning Doc from the UK.
>> I have a request for help/advice that I would like to post onto the
>> Ten Tec archives but cant seem to post it.
>> If tell you my tale of woe can you be so kind as to post it for me or
>> advise how I can do it for myself.
>> I have a Corsair 1 that now has some erroneous frequency readings on
>> 10, 17, 21.
>> When I purchased it there were no readings at all (all 'E's), the
>> circuit diagram and component layout pictures in the manual are
>> different to what is fitted to the radio.
>> I purchased at great expense the 'prom' for the counter display, that
>> made no difference.
>> I then replaced all of the 'ic,s' in the counter and it started
>> working on some bands.
>> I subsequently found out from the seller that he had changed all the
>> diodes on the counter board, on checking the circuit diagram some of
>> the diodes look to be the wrong way round, maybe this is what is
>> causing the erroneous readings!!
> I have only Corsair II data and there are no diodes on the counter
> board, but a gang of diodes could have been used in the Corsair to
> convert band data to binary for the processor. Diodes backwards will
> upset that logic.
>> My question is 'Has anybody got a digital picture or can take one of
>> the diodes so I can compare their picture to my PCB'.
>> Is the frequency display the same as the Corsair 2, I have 1 of those
>> radios as well that I can refer to.
> Apparently not since there are no diodes on the 2's counter board. There
> is a single wire band input but I've not been able to trace it. Probably
> the BFO, and injection frequency inputs are enough to count the band
>> If you please pick out the relevant points and post that for me
>> Snowy Howell BCRE25
>> BT OPENREACH
>> Tel (01733) 816251
>> Fax (01733) 331886
>> E mail email@example.com
> 73, Jerry, K0CQ
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