"Dave White" <[EMAIL PROTECTED]> made an utterance to the drakelist gang
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I've rebuilt a couple of the C Line VFOs using the article referenced by
Garey - excellent information. Something that I found affects the
"freeness" of the tuning mechanism is the tension on the spring that holds
the idler gears against primary shaft. Too much tension causes the gears to
force their engagement and consequently causes more friction and increases
overall drag on the mechanism. You can experiment with lower tension
springs (or stretching the original), but proceed at your own risk!
Dave
VE6DRW
Garey Barrell <[EMAIL PROTECTED]> made an utterance to the drakelist
gang
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Wade -
I have owned / worked on a LOT of 4 Series units since about 1964, and
I've never come across one that would 'spin' the way the old Hammarlund
and Hallicrafters flywheel driven dials would.
They should however be easily tuned by resting your finger on the side of
the knob (or in the button on the C Line) and moving your finger in a
circle.
The PTO is driven directly by the lead screw and follower within the
"gearbox" at the front of the PTO. All the gears are there solely to
drive the dial disc(s).
An excellent article on the foibles of this arrangement is at:
<http://www.wb4hfn.com/DRAKE/DrakeArticles/PTO/Drake_PTO.htm>
The article is based on the C Line, but is applicable to all the 4 units
that use the nylon gears. The big "secret" is that nylon gears are
designed to run _DRY_ , i.e., no lubrication at all, especially
petroleum based lubricants.
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 4-B, C-Line & TR-4/C Service Supplement CDs
<www.k4oah.com>
H D MAC LEOD wrote:
"H D MAC LEOD" <[EMAIL PROTECTED]> made an utterance to the
drakelist gang
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Hi Drakelist.
I am interested in understanding how smooth the Drake C Line dial
mechanisms were when the product was originally shipped from the factory.
Perhaps some of you are original owners of C Line equipment and would
comment?
I have read that "The dial mechanism should offer only slight resistance
to the tuning knob. You should be able to fast spin the tuning knob by
placing your index finger on the outside of the knob and rotating your
hand."
Is this technically correct? I have a couple of C-Line units from
different sources where the dial mechanisms are identical and smooth but
definitely not free finger spinning as described above.
Wade VA3HM
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