[Boatanchors] VFO's??

[Flowertime01 at wmconnect.com]

Stephen,

In the Osc the crystal acts as a tuned circuit in an amplifier stage with 
feed back. One side of the crystal goes to the grid of the tube. The other side 
of the crystal gets feed back (through an isolation cap from the B+) from the 
plate. Some crystal oscillators operate with ground on one side of the crystal. 
Believe that you can have feed back through the ground path.

If the oscillator crystal is grounded on one side, you just plug the VFO into 
the crystal socket points. This can be with a connector into the crystal 
socket or through an accessory plug. 

If the oscillator crystal is not grounded on one side, then the hot lead from 
the VFO goes to the crystal pin that feeds the OSC grid and the ground lead 
from the VFO goes to ground. If the transmitter has an accessory plug the plug 
may be wired to the OSC circuit to allow the VFO to plug in with the hot lead 
to the tube grid and the ground is made at the accessory plug.

Crystal OSC have some large voltage gains. Put a scope on the output of the 
OSC with a crystal in the circuit and see how large the signal is. Then plug in 
the VFO and check the same point for signal size. The VFO may not provide as 
much output as the crystal does. If you cannot live with the reduced signal 
output from the VFO and OSC lashup, you can add a voltage buffer amp between the 
VFO and OSC to boost the OSC output up to the same level you get from the OSC 
with a crystal in the circuit.

If you need some more specific help send me some mail.

Roger KC6TRU