[Milsurplus] GRC-106 DC power supply problems from Mike W7NPA

Fri, 10 May 2002 23:55:11 -0500

Mike,

I would try Fair Radio for the parts.  You may be able to pick up the
complete power supply module for the AM-3349 there.

73s  John  WD5ENU/A45XV

-----Original Message-----
From: Greg Werstiuk [mailto:[email protected]]
Sent: Thursday, May 09, 2002 10:20 AM
To: Michael A Heltborg; [email protected]
Subject: RE: [Milsurplus] GRC-106 DC power supply problems from Mike
W7NPA

With the "STC" prefix, the "STC-2114" may be a component that was
manufactured by Silicon Transistor Corp.  They specialize in military and
high-reliability power semiconductors.  If the component itself is not
available, perhaps they can provide a spec so you can take a shot at a
sufficiently close alternate.

- greg

-----Original Message-----
From: [email protected]
[mailto:[email protected]]On Behalf Of Michael A Heltborg
Sent: Wednesday, May 08, 2002 8:28 PM
To: [email protected]
Subject: [Milsurplus] GRC-106 DC power supply problems from Mike W7NPA

Hi Everyone,

I had the misfortune of shorting the switching transistors in my GRC-106's
Amp the AM-3349  DC to DC power supply...
They are either the MHT-9801's or STC-2114...  I need a pair of one or the
other type...  Also gone is the base resistors R-1 and R-2 for these
transistors...  They are 1 ohm at 33 watts...
Any help that anyone could give would be great.... Spec's, places to look,
or even the parts!
Thanks from Mike W7NPA
e-mail is [email protected]
 Also here what happened that caused the switching transistors to short...
I was using the GRC-106 with the MD-522A on 850 shift RTTY.   The other
station send me some CW because of poor band conditions, in order to tune
him in better I changed Modes to CW from FSK on the GRC-106, the 522 was
still in the 850 shift mode (or FSK mode ) ...  As I changed modes in
receive the Amp was keyed ( I think ) by the 522 somehow shorting the
transistors in The DC supply...  So from now on I will make sure that I have
the 522 on voice or turned off before going the CW mode on the GRC-106...
Mike W7NPA

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