[Heath] SB102 Main Tuning Knob And Friction Wheel

[Rich Sahlender]

Very helpful guys. An excellent bunch as usual. Now if I could just get
the smaller friction wheel for adjusting the cal pointer to also keep
the dial indicator from moving when the VFO is tuned I'll be all set!

tnx es 73 de Rich WA3WLH

On Thu, May 31, 2018 at 12:27:06PM -0400, Rich Sahlender wrote:
> Hopefully the following will make sense to those of you familiar with
> the SB102 VFO and the curious "friction?" method used by the main tuning
> knob to actually tune the VFO.
> 
> I acquired a SB102 on which the VFO main tuning knob was spinning without
> moving the VFO. The old ragedy manual that was provided with it is useless
> as the pages related to how the mechanism works are badly worn and / or
> missing. So until I can get a usable copy of the manual I am winging it.
> 
> I pulled off the main tuning knob and found that the "friction?" wheel on
> the stud that the knob installs on was not making contact with the
> "ring?" on the VFO mechanism itself. Curious design. Anyway it looks
> like there are remains of an old disintegrated o-ring originally on that
> wheel. Is there supposed to be such a ring to provide the friction with
> the VFO?
> 
> The two "plates?" that make up the friction wheel are snug but not so
> much that they cannot simply be pushed down onto the ring attached to
> the VFO mechanism so that the ring slips in between the two plates. So I
> went ahead and did that and it now tunes the VFO just fine but... should
> it be left this way to operate or should I be looking for an
> appropriately sized o-ring to slip on the wheel to provide friction with
> the ring in the VFO mechanism?
> 
> tnx es 73 de Rich WA3WLH
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