[Central-Electronics] CE20A VFO drive level

[Ed - K9EW]

Hi Jon,

The crystal oscillator stage in most tube rigs is also used as a
buffer for an external VFO.  This stage usually requires about 9Vpk-pk
for adequate drive.  You can use a toroidal transformer (5t pri and
30t sec twisted together on a T50-2) to boost your signal generator up
to that level, or you can use an active stage or two.  If the active
amplifier isn't broadband, it will require tuning to peak it at the
desired operating frequency.  A CATV integrated circuit amplifier
(both stages of an LT1253) can be used without tuning.

Hope this helps.

73,
ed - k9ew
www.k9ew.us


On Tue, Apr 12, 2011 at 2:52 PM, k6jek <k6jek at comcast.net> wrote:
> How much signal does a 20a need from the VFO?
>
> I have the 20A working with a crystal but the 458 VFO is a mess.  I thought, what the heck, use a signal generator to get on the air.  The 1V my signal generator delivers isn't doing it.  Should it?
>
> Thanks,
>
> Jon
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