Sometime in the '70s I recall going on a tour
of the Drake factory with one of the Dayton area radio clubs. I
distinctly remember seeing a room with a rack full of
newly-assembled R-4Cs powered up and was told they were being
burned in and checked for drift. So there was definitely some sort
of factory check for PTO stability.
73...
Randy, W8FN
On 2/9/2023 12:31 PM, VE7PS wrote:
toggle quoted message
Show quoted text
Paul:
I have never read of any QC tests for PTO drift
post-full-assembly, but wouldn't be surprised if someone at
Drake did this.? It's a good question for Steve Koogler.? Have
seen him in the past at the Drake Radio Club outside "booth"
near the race track viewing stands at Xenia. That gang often
has some Drake goodies there for sale too.
Many of us have installed small fans on the top or rear of
our transceivers and transmitters....curious now to see what
that does to the warm-up and long-term drift too.? Good
project for the summer.
73
Peter
VE7PS
On Wed, Feb 8, 2023 at 8:19 AM
Paul Christensen <
w9ac@...>
wrote:
While
working on a TR-4Cw RIT model, I noticed that with
the covers in place, PTO drift is very small, about
200 Hz from start to being fully warmed up after an
hour.? However, with the covers off, total drift is
about 1,200 Hz over an hour then stops.?
?
Obviously,
I don¡¯t operate the radio with the covers off and
I¡¯m quite happy with the small amount of drift with
the covers in place.?
?
Still,
I¡¯m curious if Drake¡¯s final QC tests included
inspection of PTO drift in a completely assembled
radio.? I had always assumed that Drake only
completed PTO end-to-end tracking adjustments and
temperature compensation on a bench test jig, but
not inside a warmed-up radio.?
?
Paul,
W9AC
