[ARC5] ARC-5 T-20 Frequency coverage and other questions

[J Mcvey via ARC5]

I have one of those transmitters in pristine condition. I knew that resetting the MO and final bandset caps was possible, but by how much? I was thinking if I could bring it down exactly 1 MHZ then that would be an easy interpolation on the original dial. Will it go down that far ?



On Wednesday, July 30, 2014 10:22 PM, AKLDGUY . <neilb0627 at gmail.com> wrote:
 


Many decades ago I shifted a T-20 (4-5.3 Mc/s) to the 80m band simply by
unlocking and resetting the VFO and PA bandset capacitors.

I'm almost certain that allowed coverage of the entire CW portion, because
IIRC that was my first ARC-5 transmitter and I had it ready to go on the
day my ticket arrived in the mail and worked Russ ZL4JW on CW the same
night (27 October 1967). I was at North Shore, Auckland and he was at
Omarama near Dunedin. Still have the original log book.

Can only suggest you try resetting those bandset capacitors before
attempting any "recommended" mods.

73 de Neil ZL1ANM


On Thu, Jul 31, 2014 at 9:10 AM, Andrew Kopke <andrewkopke at rocketmail.com>
wrote:

> Hello all, I'm new to the group and a new owner of a ARC-5 T-20
>
> After doing some reading on line ,It appears as though this model could
> cover the 80 meter band mentioned in one of the conversion manuals ( I
> think it was "Command Sets" published by CQ ) Anyway, That mod mentions
> adding a capacitor somewhere . There is another modification that involves
> C-60 and, making the plates of that capacitor fully meshed. I took the
> cover off and sure enough the paint seals were broken and the capacitor was
> closed.
>
> I haven't even begun building the power supply as of yet . I do have  a
> 24v dc 2.5 amp supply.
> I have alot of questions to follow ,but my first question is :does anyone
> know if this transmitter will cover the bottom CW portion of the 80 meter
> band with the plates of C-60 closed?  I don't see any other modifications
> done. I washed the set in the sink with dawn and rinsed with distilled
> water  unfortuately, I washed off the white ink behind the plastic window
> of the roller inductor scale ,but can still see the number scale engraved
> in the plastic. I suppose I could just get a white paint marker and re- do
> it . Any thoughts?
>
> Thanks for any insight,
>
> Andrew Kopke
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