[TenTec] Solving PTO drift

[Steve Hunt]

Steve,

I think I've done 4 re-builds now. On each one I've needed to carefully 
select the number of washers which space off the plastic spring housing 
at the back of the PTO; they determine how much pressure is applied to 
the shaft assembly : too few washers and it all feels very stiff, too 
many and the vernier slips. I don't always get it right first time - 
what "feels right" when the PTO is out of the radio never seems quite 
the same when it's back in the radio and been used for a bit! In one 
case I used combinations of TT's washers and some thinner ones to get it 
just how I wanted.

I keep meaning to see if I can make that spacing "screwdriver adjustable".

It's not an easy adjustment to make with the PTO in the radio ..... and 
of course this may not be your problem anyway :)

73,
Steve G3TXQ


On 06/09/2011 03:05, Steve Berg wrote:
> I had the factory rebuild both PTOs in my Corsair II and the external
> VFO last year.  The one in the rig has settled down, but the one in the
> external VFO is acting up.  It is still stiff, and has a lot of slop
> when trying to tune it slowly. I noticed this weekend, that the dial
> skirt moves at the same rate as the tuning knob.  So, apparently there
> is minimal vernier reduction going on.  Before I send it back, is there
> a fix for this that I can do myself without disassembling the PTO itself?
>
> Thanks!
>
> Steve WA9JML
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