[TenTec] Corsair II LPF-TR Board

[Barry N1EU]

Rick, what is the serial number of your Corsair II?

Thanks,
Barry

On Wed, Jun 8, 2016 at 9:19 AM, Barry N1EU <barry.n1eu at gmail.com> wrote:

> Please send all Corsair II manual discrepancies to me as well.  I've tried
> to compile a list of Corsair manual errata at
> http://corsair.wikidot.com/corsair-errata
>
> 73, Barry N1EU
>
> On Wed, Jun 8, 2016 at 8:49 AM, Reeve Family <reevefamily at cogeco.ca>
> wrote:
>
>> Yes Barry, I feel badly that I did not take photos to document that whole
>> LPF-TR board removal process. I would normally do that but was too heavily
>> involved in the trouble shooting process and not sure at the time where it
>> was leading.
>>
>>
>>
>> I did however make some notes and drawings at the time while I was
>> disassembling the Band Switch in order to get the LPF-TR board out of the
>> chassis. If you want I could try to scan and submit those.
>>
>>
>>
>> I must admit, I am not great with navigating and posting with online user
>> groups. Can you give me an email address that I should send .jpg or .pdf
>> files to in order to have them posted?
>>
>>
>>
>> While trouble shooting my problem I also discovered some changes on the
>> LPF-TR board regarding biasing resistors for the PIN diodes. I bought my
>> Corsair II new from a dealer at the Dayton Hamfest so presumably these
>> changes were done at the TEN TEC factory. I recall reading somewhere about
>> improvements to performance in PIN diode biasing, however I did not make
>> these changes to my Corsair and so can only presume they were made at the
>> factory but not documented by TEN TEC on the schematic.
>>
>>
>>
>> Regardless of who did the modification, here is what I found on the LPF-TR
>> board in my radio:
>>
>>
>>
>> 1.       470 ohm resistors were installed in series with D1 and D2
>>
>> 2.       R3 had been changed from 330 ohms to a 100 ohm resistor
>>
>> 3.       R6 had been changed from 150 ohms to a 47ohm resistor.
>>
>>
>>
>>
>>
>> It was a bit discouraging to find that the more  details I looked into,
>> the
>> more discrepancies I found with the schematics in my manual. Having said
>> that, I still love my Corsair II and will not likely ever part with it.
>> Accordingly, I have kept careful notes on every modification or repair
>> ever
>> made to my Corsair in the 28 years that I have owned it.
>>
>>
>>
>> 73,
>>
>> Rick VE3ORY
>>
>>
>>
>>
>>
>>
>>
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>
>