[MRCA] T-195 Auto-NoTune

[DSP3]

Corollary to the current discussion, I've been thinking (dangerous 
activity!) about building an external  KV DC supply for the T-195( ) 
transmitters.  The original dynamotor requires about 68 amps of inrush 
current.  The running current is maybe 35-40 amps, key down.  The HV 
dynamotor is the killer for the PP-4763 and the 7333.  Also poor old K2 
takes beating in the straight T-195.  I figure one would need 4 wires 
for the interconnect; ground, "start", control, and B+.  The T-195B 
(with the Victoreen solid-state supply) requires a straight 32 amps to 
start and run.  Now, the rotary unit that makes the 400 Hz voltage would 
have to stay, of course as it produces multiple voltages. Some units are 
mobile, of course, but many are at home and permanently ensconced.  A 
hidden power supply might be an idea and DC  current might be reduced to 
as low as maybe 20 amps, total? Any interest?

Jeep - K3HVG


On 7/15/2015 6:31 AM, DSP3 wrote:
> Chris,
>
> But that I was the guru for the GRC-19, but that's not the case, of 
> course.  An area of concern for the servo system are the matched sets 
> of discriminator diodes.  The manual admonishes to change these diodes 
> on a VERY regular basis, something like every 60 hours of use!. To 
> even mention those specific components is a clue.  I think the 
> requirement for a higher DC bus voltage is not a design issue but one 
> where other components in the servo loop are deteriorating.  I'd, of 
> course, check the tubes in the servo chain and then replace the 
> diodes.  The a.c. chopper could also be going bad.  Its the same part 
> as in the ARC-38.  They're available and not too expensive, either.  
> The last time I found them, they were about $20 each.  I may still 
> have one or two here and someone on the group will surely have some.
>
> Jeep - K3HVG
>

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