Date: 13 Mar 89 16:07:03 GMT
From: oliveb!pyramid!prls!philabs!briar.philips.com!rfc
Casey;6282;3.57;$0201)
Subject: tiny-2 tnc fix
copied from packet:
Msg# TSP Size Read To
25853 BN 1240 0 ALL N2EZG 8903/1617
Subject: Paccomm Tiny-2 Factory Mod
Here is the "Factory" fix for Pac-Comm Tiny-2's & Micro-Power 2's
that have become hard of hearing. It seems that Pac-Comm has some
boards out that work fine when new, but with age the tnc requires
a huge amount of Audio input from the speaker jack or it won't
decode properly. They are lost as to what is deterioating in the
boards but offer this fix to its customers.
It is quite simple and very neat, all parts are mounted on the
under-
side of a 16 pin IC socket, the Modem chip TCM3105 (U16) is
removed,
the modified socket is inserted into existing socket on TNC's
board,
and the modem chip is re-installed.
Parts Needed:
1 - 16 pin IC socket
1 - 2222 Transistor NPN (EGC 123AP)
2 - 10000 ohm 5% resistors (brown-black-orange-gold)
Instructions:
Solder 1 resistor to Emitter, other end of resistor to pin 12
Solder 1 resistor to Base, other end to pin 2
Solder collector to pin 5
>EndFile<
SOURCE: The QRZ Windows Ham Radio CDROM |
