[Johnson] Several technical questions

[Ed Tanton]

At 03:42 PM 2002-07-12, kwylow zinjanthropus wrote:

>All:
>
>Still in the "design phase" of a 2-4 tube (not including rectifier) AM/CW 
>transmitter. I just need a few questions answered:
>
>1) Choke-cap or cap only filtering for the power supply. Which is better? 
>I do have a 10 Hy 250 mA choke available but I may end up using it on my 
>next question.

1) Cap-only filtering, with enough capacitance, is probably OK... if you 
don't want to buy another choke [for the modulation] and if 250mA answers 
your requirements.

>2) Heising modulation. May have to go the 6L6 route: 6L6 modulated by a 
>6L6. Of course, that 10 Hy choke may do the duty of the modulator. Any 
>problems with that?

2) Not a clue here.

>3) Should I retain the choke for filteration purposes, will there be a 
>problem putting the choke at the C.T. of the power xfmr's plate circuit? 
>I've seen it done with the EFJ Courier. I would like, quite frankly, to 
>get away from putting the choke in the B+ area if at all possible.

Absolutely not. That's just where you should put it. The one caveat being 
that if the choke were to open up, you get some serious floating potential.

>4) Where can I get lighted meters? Rare as hen's teeth. Ideally, I'd like 
>to get an amber colored unit to display my current/etc.

Good luck!!!

>Other than that, that's it! Thanks and let me know your thoughts.
>
>
>
>Cal, n6KYR.
>
>
>
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73 Ed Tanton N4XY <n4xy@earthlink.net>

Ed Tanton N4XY
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Marietta, GA 30068-3466

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