[AMRadio] Modulator for DX60 available

W5OMR/Geoff w5omr at satx.rr.com
Fri Apr 14 10:27:50 EDT 2006

Alan Beck wrote:

> I am sorry, did we work out how it could be interfaces with a DX 60?
> Normally there is a transformer in parallel with the output plate I 
> think and modulation is applied to the other side to "squish" the RF 
> at Audio frequencies.
> Is this what you mean by output iron?
> John Lyles wrote:
>> I have a self contained, commercial looking modulator chassis that 
>> would work well with a DX60 sized rig. It uses a pair of 807s and has 
>> the input and output iron and driver tubes. It came from a SK's pile 
>> this summer. If there is interest, I would part with it to help out a 
>> DX60 conversion to high level plate modulation. Its a small thang. 
>> Technical details available upon request.

Alan, I'm pretty sure John's statement was meant to say that the 
external modulator he had, would work with a rig that was around the 
same size (ie: power output of around 50w) as a DX-60.

Of course, we all know that typical high-level plate modulated AM 
requires a modulation transformer that is connected in series with the 
B+ supply from the power-supply of the final, to the final stage 
itself.  The audio generated by a typical push-pull Class B modulator is 
coupled via the modulation transformer to the B+ line.

I might be mistaken, but I don't think I've ever seen an 'external' 
modulator deck that was built with the intention of  screen/grid 
modulating an RF final.

Hope that helps clear up some confusion.

73 = Best Regards,

A: Yes.

> Q: Are you sure?

>> A: Because it reverses the logical flow of conversation.

>>> Q: Why is top-posting annoying in email?

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