[Heathkit] AT-1 VFO to xtal input comments needed

[Bwana Bob]

Cal: 

 I don't think that hum will be a problem. However, the coax will
introduce some capacitance in parallel with the crystal which  may shift
its frequency slightly and may affect stability (i.e.: chirp). You'll
have to try it an listen for any ill effects on a receiver. You may want
to try a low capacitance coax like RG-62/U.

You should have received the crystal socket and octal socket from me by
now. I hope they  arrived this time!


			73,

			Bob WB2VUF

kwylow zinjanthropus wrote:
> 
> Hi:
> During the process of rebuilding Heathkit's AT-1 transmitter, I noticed that one can power the VF-1 VFO from a power socket at the back of the xmtr. However, there exist no VFO input to the transmitter except by plugging in an FT-243 type plug into the xtal socket. While this is all fine, I really like a "cleaner" method of VFO input to the AT-1 without punching any extra holes.
> 
> I propose to input the VF-1's rf output to the AT-1 in the followiing manner:
> 
> -Connect a 4" piece of RG-174 from the AT-1's vfo socket empty pins directly to the crystal socket solder tabs.
> -Running another piece of RF-174 from the VF-1's power plug through the shell and on the RF output connector of the VF-1.
> 
> Here are my concerns:
> -What are the problems associated with leaving the inboard RG-174 and going back to xtal control? This is a 4" piece of coax and I think I may experience some frequency shift of the xtal
> -Should I be concerned about hum pick-up?
> 
> Let me know your thoughts and thanks. Cal, N6KYR.
> 
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