[MRCA] T-195 Auto-NoTune

[Dennis DuVall]

There was a transistorized version of the chopper, see page 1-51, TM 11-5820-335-35.  Not much to it, should be possible to replicate.  I have also replaced diodes in the antenna tuning discriminator without any kind of “matching” and worked fine.  Blew the originals accidentally trying to load up into an open antenna circuit.  DON’T DO THIS…..

Dennis D.  W7QHO
Glendale, CA

*********

> On Jul 15, 2015, at 11:02 AM, Ray Fantini <RAFANTINI at salisbury.edu> wrote:
> 
> Don’t know what would happen to the chopper motor in the can at 60 HZ but the issue I was running into is that the thing would go but the contacts were not working. Have thought of drilling small hole and squirting contact cleaner in but don’t know the wisdom of that. The only true test I have found is substituting  in a working servo system, easy on an ARC-38 or a 180L antenna tuner but looks like a huge issue doing anything with a T-195 out of its case.
> If I did not have ten thousand other things going on maybe it would be an idea to try using a 4066 bilateral switch and working up a small circuit that uses two of the internal gates and works as a virtual chopper. The 4066 has four gates and they magically appear as an analog contact closure to the outside world although it’s all on one little chip.
>  
> Ray F
>  
> From: MRCA [mailto:mrca-bounces at mailman.qth.net] On Behalf Of DSP3
> Sent: Wednesday, July 15, 2015 10:53 AM
> To: mrca at mailman.qth.net
> Subject: Re: [MRCA] T-195 Auto-NoTune
>  
> Ray,  
> 
> Question for you.... Do you suppose I can test these choppers using 6.3v at 60HZ?  I found a small larder of them and should test each one.  Interestingly enough, there are several mfgrs indicated with multiple p/n on each one?
> 
> Jeep - K3HVG
> 
> 
> 
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