[AMRadio] Transformer


rbethman rbethman at comcast.net
Sun Jun 8 15:53:12 EDT 2014


The actual VFO for the DX-60 series is the HG-10.

It has its own VR tube.

That particular pairing is pretty darn stable.  It didn't matter whether 
you used Controlled Carrier AM or CW.

Bob - N0DGN

On 6/8/2014 3:07 PM, Rob Atkinson wrote:
> Unless I am mistaken, the problem I see with powering the VFO from the
> transmitter is that the B+ swings a lot from no-load to transmit.
> Maybe in the better rigs it is okay but in a cheap novice CW rig like
> my Knight T-50, it goes from around 550 or 600 v. down to around 450
> when the rig is keyed.  it seems to me that's a recipe for chirp if
> you let the VFO free-run in transmit.   I think the EFJ 122 needs
> around 300 v. + filament supply.   I have a nice one here but I plan
> to run it off a separate regulated supply with a couple of 0A2 in
> series.
>
> Rob
> K5UJ
>
> On Sun, Jun 8, 2014 at 7:28 AM, Mike Sprenger <mikesprenger at gmail.com> wrote:
>> Yes, The VF-1 is powered from the transmitter.
>>
>> However, on a DX-60 the B+ is switched on/off...on the octal connector.
>>
>> The Opportunity I see is to keep VF-1 powered  up always up for stability. (It's on my to-do list)
>>
>> Thanks,
>> Mike
>> W4UOO



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