[TenTec] Corsair II LPF-TR Board

[Barry N1EU]

Thanks Rick!  Please send what all you have to me at the return email
address of this posting or my QRZ.com email address.

I'm going to start to upload some of the info you shared in these posts to
the tentec wiki.

The circuit changes that don't match the schematics is not surprising.
Ten-Tec was never very good at publicizing evolutionary changes to radios.

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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