[ARC5] ARC-5 T-20 Freq and recent eBay idiocy

[Kenneth G. Gordon]

On 31 Jul 2014 at 23:54, john rose wrote:

> Yes, I saw that `alleged T22´.
> 
> I drooled over that `alleged T22´
> 
> I opened my wallet. Empty.
> 
> I checked the credit card. Maxxed to the MaxMax.
> 
> I cried over that `alleged T22´
> 

Same here: all of the above...
 
> I put it on my watch list.

So did I...then promptly forgot about it....

> After it sold BIN for $49, I was able to look at it again.

Sigh...I wasn't: I deleted the reference to it...

> My memory bell got
> rung. Many decades ago (drat, am I really old enough to say that?)

Aren't we all...well...at least **I** sure am...

> I was
> successful in purchasing a T16 of dubious quality and a low price to match. I
> pulled it out of cold storage and found my memory had served and not sieved.
> C67, the oscillator pad, was modified in exactly the same manner as this one
> right down to the same rotors left in the same slots. I wonder if the same guy
> modded both. That brings up the question of the hour. That padder has the same
> number of plates as the HF rigs, that my ruler says are the same size as the HF
> rigs, and in a frame which is the same size as the HF rigs. Does anyone have any
> reason the two part numbers cannot be interchanged?

Not **I** "said the Little Red Hen". I would most certainly try it.

>  Or why I couldn´t replace
> this rotor with one from an HF rig to keep the original part number?

Well, according to the AN/ARC-5 Navy maintenance manual, all of the T-15, 
T-16, and T-17 use the same oscillator "tuning" capacitor, the ARC-9251, 
while all the others use the ARC-5032. This is C-63 on the schematics.

For ALL transmitters, the oscillator padder, i.e., the one in the can on top, is 
identical, ARC-4990

I have, so far, not found exact specifications on either one of these.

One clue might possibly be the tuning ranges: 300 Kc in the T-15, etc.

Ken W7EKB