On Wed, 2006-04-05 at 18:27 -1000, Ken Brown wrote:
> No reason you cannot use a good stable Ten-Tec transceiver in CW mode as
> a VFO to have some degree of frequency agility. You're going to have to
> work on the tank circuit a bit to get it to 160 or 75 meters anyway, so
> why not make it tunable.
>
> I'm thinking an RCA BT1K. Push Pull 833s modulated by Push Pull 833s.
> It's only a kW. Since it is a 50s vintage TX, 50's vintage ham power
> limits should be appropriate way to maintain purity and stability to a
> level the state of the art permits. And it will fit in a one car garage.
>
> DE N6KB
>
Gates and Collins all made a pair of 833s modulated by a pair of 833s.
More likely paralleled in the PA.
50's vintage ham limit were PA plate input power ignoring the peaks from
modulation. A pair off 833s ought to run 1800 watts PA input to get 1 KW
RF carrier with a peak power output of 2 KW. Today with the peak power
output limited to 1.5 KW, its still not legal. I'm sure it can be backed
off a bit though that wasn't type approved. It would be easier to back
off the power of a tetrode or pentode PA by lowering the PA screen
voltage.
These rigs are all tunable from outside the box, probably hidden behind
a door.
--
73, Jerry, K0CQ,
All content copyright Dr. Gerald N. Johnson, electrical engineer
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