[Heath] SB102 Main Tuning Knob And Friction Wheel

[Guy Giacopuzzi]

Amen to everything Glen says below....


On 5/31/2018 10:24 AM, Glen Zook via Heath wrote:
> No "O" ring on the mechanism that turns the LMO in any of the Heath 
> SB-Line equipment.  The friction ring sits so that there is one 
> portion on each side of the inner ring of the dial.  This is adjusted 
> by moving the assembly up, or down, on the inner ring.  The adjustment 
> is correct when the dial can be turned through a full 360-degrees 
> without slipping or binding.
>
>
> It sounds like someone tried to use an "O" ring to provide friction 
> instead of properly aligning the drive.
>
> Glen, K9STH
>
> Website: http://k9sth.net
>
>
> ------------------------------------------------------------------------
> *From:* Rich Sahlender <wa3wlh at comcast.net>
> *To:* heath at puck.nether.net
> *Sent:* Thursday, May 31, 2018 11:33 AM
> *Subject:* [Heath] SB102 Main Tuning Knob And Friction Wheel
>
> 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?
>
>
>
>
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