Fw: [TMC] TMC MMX-2B

Fri, 9 May 2003 07:46:26 -0500

----- Original Message -----
From: "Jim Hyde" <[email protected]>
To: "JIM OLDS" <[email protected]>
Sent: Friday, May 09, 2003 7:44 AM
Subject: Re: [TMC] TMC MMX-2B


> Jim - While going back through some emails, I saw yours about the MMX-2B.
If
> that is a piece of tube-type equipment, I would say that the problem is
> almost certainly a "soft" tube. Such tubes may light up OK, but take a
very
> long time to build up emission. You probably know this already, but no
harm
> in mentioning it. I have actually had this problem with the TMC VFO.
>
> I am new to TMC, and am about to try to put an SBT-1K-S on the air (looks
> like a daunting task), fix a non-functional GPR-90 when it gets here and
> connect it to the military version of the Sideband Slicer, whatever the
> nomenclature is. So I may be crying for help soon. Almost exactly 10 years
> ago I ordered manuals for the SBT1K from TMC ($75.), and received a full
> set, but my exciter is the SBE-2. For what it's worth, the address I used
> is: Technical Materiel Corp.,
> 700 Fenimore Rd., Mamaroneck, New York, 10543-2301.
>
> By now you probably have everything working. If not,  good luck!
>
> 73,
>
> Jim Hyde, W5JGI
>
>
>
> ----- Original Message -----
> From: "JIM OLDS" <[email protected]>
> To: <[email protected]>
> Sent: Thursday, May 01, 2003 5:33 PM
> Subject: [TMC] TMC MMX-2B
>
>
> I have been using the following TMC equipment in my HAM SHACK for 20 yrs.
A
> GPT 750 TRANSMITTER AND a MMX-2B EXITER.  Has anyone got a SCHEMATIC and
or
> Maintenance MANUAL for the MMX-2B. I will gladly pay for copying and
mailing
> .  I have a really severe warmup up problem that is I don,t get any RF
> output for about 2 hrs after A.C. power is applied. I have checked the
> various oscillator and multiplier chains and it looks like it may be
> capacitors in the tuned ccts. changing value as they heat up ( Only a
guess)
> What makes me say this is I can retune the ccts from a cold start and get
> output on individual chains but they go out of tune as the unit warms up.
So
> as a stop gap measure I tuned the ccts after the unit had heat stabalized
> after 3hrs.
> Doing trouble shooting on this unit without a schematic is a real BUMMER
so
> would appreciate any help/suggestions that you can give
>
> Yours truly
> Jim
> VE1ALN
>
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