Eddy -
I'm having trouble describing the amount of effort required to hook that spring. You really don't
have to brace your feet against the chassis to pull it (!), but it should not just sort of fall into
place either. A little common sense is required, pulling on the yoke and letting it snap back into
place is the best test. The bottom of the yoke is on the drive screw, the spring is on the top, and
the slug attaches to the middle, so there is a certain amount of lever effect.
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line
and TR-4/C Service Supplement CDs
<www.k4oah.com>
Eddy Swynar wrote:
Hi Garey,
Well, it definitely does NOT take a heckuva lot of effort to pull that spring on my
PTO. To-day I disconnected the spring entirely& had to apply pressure to the
OTHER side of the yoke to make the frequency jiggle---so I guess it's doing its
job, alright, maintaining some modicum of pressure on the yoke...
Yes, the more I get "into" this thing, the more I can see where even one weak link in the
MECHANICAL chain of things can cause no end of electronic vexation! I think Ill give the
"sliders& riders" on mine a good bath in isopropyl rubbing alcohol next---that'd be far
easier to do than dis-mantling the works, and as I said before, the solution is probably just
oh-so-easy that it's staring me in the face...
~73~ de Eddy VE3CUI - VE3XZ
************************************************************************************************************************
On 2011-08-01, at 9:59 AM, Garey Barrell wrote:
Eddy -
Yes, the yoke is directly connected to the slug, and therefore very susceptible
to ANY movement. This is the reason for the spring to the shield can, i.e.,
keep everything 'solidly' engaged. Maybe just a weak spring? It should take a
definite effort to stretch the spring to hook it. Also any dirt or corrosion
on the rider bar can cause 'bumps'. It should be 'clean and dry'..........
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line
and TR-4/C Service Supplement CDs
<www.k4oah.com>
Eddy Swynar wrote:
Hi Guys,
To-day I had occasion to take the top cover off of my T-4X transmitter,&
examine the PTO mechanics a bit...
Question: how "normal" is it for the frequency to "jump& jiggle" whenever even the
lightest of physical force is applied to the yoke...? Is this expected, or should the frequency stay put no
matter what, i.e. there should be no "slack / sloppiness" in the assembly...?
I noticed a bit of "play" in the yoke of my PTO---enough that if I applied even just a
modicum of pressure from a wooden chopstick, I could "jiggle" the frequency. Does this
indicate that something is, indeed, loose in mine& in need of tightening, or all they all like
this...?
The jiggle in my PTO sounds a LOT like the jiggle than I can induce with manual
pressure---maybe the key to our woes in this regard has a MECHANICAL solution,
rather than an electronic one...?
I'm gonna remove the PTO cover,& the circuit board itself, as my next step. Maybe I'll
be able to see something therein that requires "tightening"...I don't know.
~73~ de Eddy VE3CUI - VE3XZ
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