Yes, the circuitry is different. The 81401 IC complement is 2-MC1350P's and
1-LM358N, and it has 6 transistors and 3 diodes. Interface to the NB level and
NB width pots (connectors #7 and 22 respectively) are both 2-pin connectors.
.
----- Original Message -----
From: Doug Reid<mailto:n1068d@aol.com>
To: tentec@contesting.com<mailto:tentec@contesting.com>
Sent: Thursday, March 27, 2014 6:01 AM
Subject: Re: [TenTec] Corsair II noise blanker
Have you confirmed that the newer board is a completely different design from
your old board ? Are the components different ? I have an Argonaut 505 and the
power amp board is a different number from what is shown in the 505 manual. It
is identical to the newer boards built for the 509. But the number on the board
is not the same. Back in the day, I have a feeling new boards were tried and
superseded without much documentation.
Doug WD4LNW
Sent from AOL Mobile Mail
-----Original Message-----
From: A R <raf_3@msn.com<mailto:raf_3@msn.com>>
To: tentec <TenTec@contesting.com<mailto:TenTec@contesting.com>>
Sent: Wed, Mar 26, 2014 10:04 PM
Subject: [TenTec] Corsair II noise blanker
<div id="AOLMsgPart_1_0b3d700d-3241-4930-aedb-e5f57f74355a" style="margin:
0px;font-family: Tahoma, Verdana, Arial, Sans-Serif;font-size: 12px;color:
#000;background-color: #fff;">
<pre style="font-size: 9pt;"><tt>Of my two Corsair II's, one has a NB board
p/n 80977, which correspond to the NB called out in the manual. The other
Corsair II has a NB board p/n 81401, for which I've not been able to find any
documentation. TenTec has been unable to find documentation for this NB,
despite the fact that it appears to be of production quality (not one-off lab
bench quality). Does anyone else have a Corsair II with the 81401 NB, or any
information (schem and interface interconnect) for this NB? The 81401 NB has
roughly 2/3 the component count of the 80977, and has no unpopulated holes or
device hole patterns. S/N of the Corsair II with the "rogue" NB is 561-02258.
Thanks,
Allen---W7GIF
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