Pete, there is an article in the September issue of QST called
"Amplifier Care and Maintenance" (pages 33-37). You can obtain a PDF
from the ARRL web site if you're a member.
73, de Mike, K9UW
Amherst, WI
On 12/6/2011 4:57 PM, N6QW wrote:
I am new to this list and did check the archives to see if perhaps this was
specifically covered by others. While there were references to drift
correction in the Corsair's, I did not see this cure mentioned.
Earlier this year I purchased a Corsair one that I would call in "medium" shape and was
generally pleased with the purchase save for the drift problem that would take about 2 hours to
finally stop drifting. But it was the the drift in the first half hour that was a killer. Keeping
the rig powered on all of the time was not optimal. There are several manufacturers of "vfo
stabilizers" including rolling your own.
I decided to try a product from the UK called the X-Lock 2 which will be
discontinued this month to make way for X-Lock 3. Now I can turn on the Corsair
and after about 2 seconds it will lock on frequency and stay there. The kit
price depends on the exchange rate but typically is around $40. I have no
affiliation with the company but have included a link on my website so you can
see how it was installed.
5 wires are used for the interface with two of those being power which is
tapped into the Corsair rear apron aux power. 2 connections for the coax that
samples the RF output and a 1 connection to the Offset pin on the PTO. There is
a tri color led that shows the lock / unlock status and that I simply routed
out the bottom of the Corsair Case and taped it to the bottom of the case. The
range of the Offset is somewhat less with this fix but I am happy to forego a
smaller range to gain the frequency stability. YMMV but I am only sharing what
I experienced.
see: http://www.jessystems.com/X-Lock%20(rev%201).pdf
The manufacturer is Cumbria Designs, Ron Taylor G4GXO
http://www.cumbriadesigns.co.uk/x-lock.htm
73's
Pete N6QW
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