[Heath] SB102 Main Tuning Knob And Friction Wheel

[Guy Giacopuzzi]

Never knew about an o-ring; that could have been added.  To make contact 
with the dial, the friction wheel is mounted on an /adjustable /slot.  
So the amount of pressure is something /you/ set...getting it to the 
right spot isn't easy, but once it's there, /assuming the dial turns the 
LMO freely/, it works rather well and is reasonably reliable.  As I 
recall, the two plates of the friction wheel mount on the shaft with a 
screw; make sure that's tight...

Guy,

WA6OQQ

On 5/31/2018 9:27 AM, 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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>

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