[amsat-bb] Re: Drake 2880

[John Mock]

Scott, i saved a link to this message just in case this happened to me.  But
that's the output transistor, not the front-end FET, so that this might not
help.  73's
				-- KD6PAG

http://www.amsat.org/amsat/archive/amsat-bb/200306/msg00159.html
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Subject: [amsat-bb] Fried Drake Downconverter Fixed!!
From: "Ken Swaggart" <k.swaggart@xxxxxxxxxxx>
Date: Thu, 5 Jun 2003 09:27:16 -0700

Thanks to those who provided the needed information, my fried Drake
downconverter has been repaired. I replaced the final IF transistor pair,
NEC 2SC3357, Mouser part# 551-85634 which are a 1.20 each plus shipping. (I
ordered a few spares in case this happens again! The unit is working fine
and is currently copying AO-40 telemetry. Now need to order one of those
Protector or Safety Bias Tee devices...

Interestingly, when I removed the old transistors the center pins on both of
them (collector)had physically separated from the case, apparently occurring
when I transmitted into it. Guess this protected the other devices upstream.

73,
Ken, W7KKE
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