[Heath] SB102 Main Tuning Knob And Friction Wheel

[Guy Giacopuzzi]

The little ones are a pain....I've managed to salvage mine by carefully 
peening them using a variety of punches...but their far more delicate 
than the main dial ones and need to be treated gently....

Guy

WA6OQQ

On 5/31/2018 12:57 PM, Rich Sahlender wrote:
> 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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