[TenTec] The Delta External VFO

[John L Merrill]

Steve Ellington wrote:
> I just got a nice looking external VFO for my beloved 580 Delta. It appears
> to be in mint condition but like just about all old TT equipment I've ever
> bought, the PTO needs a grease replacement. In fact, this pto is totally
> frozen. So much for truth in advertising. I gave up on that a long time ago!
> Now here's the cool thing about this VFO....The frequency read out isn't a
> dial pointer using a string and elastic as I expected, instead, it's a bar
> graph with each square representing a 50khz range. This must be the only
> TenTec product like this. Does anyone know of another?
> They accomplished this by installing a worm gear on the back end of the pto
> shaft which turns another gear on a pot. The pot's resistance causes the
> display to change.
> The external vfo on these old rigs is really state of the art. You can
> listen to two different frequencies at once and with the various switches,
> make the ext. vfo either xmt or rx or both or reverse the whole thing.
> So now I've got a project and the part I'm not sure about is how to remove
> that little worm gear's pin from the pto shaft. I'ts very very tiny. Maybe a
> paper clip, needle...? Any suggestions?
> 
> Steve
> N4LQ
> 
> 
> 
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I think the CorsairI/II ext VFO's were like that. However the bar graph 
readout( not the ext vfo) drifted dramatically.

John N1JM