[TMC] TMC CV-1722 SSB Converter

[triodes at optonline.net]

Hi Robert,

Many thanks for the informative message concerning my CV-1722.

Yes, I just looked at the schematic for my CV-591A, and I see what you are referring to with regard to the LC oscilator network for the 2nd conversion oscillator being deleted in the CV-1722; in the CV-591A, this is contained within Z4; in the CV-1722, this is replaced by the XTAL oscillator and XTAL oven.

Why the need for such extreme frequency stability be ovenizing the 1st conversion XTAL oscillator, and by the ovenized XTAL oscillator for the 2nd conversion oscillator?

I understand that very few of these CV-1722 units where produced. Do you or anyone else here have any idea as to how many were produced by TMC, and when? Mine is serno. 41.

I will contact you off-line about ordering the reprint of the CV-1722 manual.

Many thanks again!

With Best 73,

Bruce, W2XR

----- Original Message -----
From: WA5CAB at cs.com
Date: Sunday, October 12, 2008 10:36 am
Subject: Re: [TMC] TMC CV-1722 SSB Converter
To: triodes at optonline.net

> Bruce,
> 
> CV-591A is TMC Model MSR-4. CV-1722 is MSR-5. Both are covered 
> in TMC 
> IN-196. Hard copy reprint $15.00 plus shipping. It might be 
> available on-line 
> somewhere if you have a printer that will handle 11x17.
> 
> There are several differences between the MSR-4 and MSR-5, but 
> only in two 
> areas. The MSR-5 has an oven for the first conversion 
> oscillator crystals. The 
> second conversion oscillator is tunable in the MSR-4. The 
> second conversion 
> oscillator tube is 1/2 of V5 (12AT7). The other half is the 
> first audio amp. 
> In the MSR-5 the second coversion oscillator is crystal 
> controlled and the 
> xtal is in an oven. The oscillator uses both halves of V5. The 
> first audio amp 
> is 1/2 of V12 (12AT7). And a 17 KC test point, J5, is added.
> 
> In a message dated 10/12/2008 9:09:49 AM Central Daylight Time, 
> triodes at optonline.net writes: 
> > I just acquired a nice TMC CV-1722 SSB Converter, serial no. 41.
> > 
> > Does anyone know the difference between this unit and the 
> more common 
> > CV-591A?
> > 
> > Also, does anyone have a copy or know the whereabouts of the 
> complete TMC 
> > technical manual for this unit that I can purchase?
> > 
> > Any help would be greatly appreciated!
> > 
> > Thanks &73,
> > 
> 
> Robert Downs - Houston
> wa5cab dot com (Web Store)
> MVPA 9480
> 
> 
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