[Elecraft] XV432 - No intermediate pwr output

[M Cresap]

I had a similar problem with my XV432. I was able to chase the problem to the tx 
driver stage. The fix was to add ground vias from the top to the bottom of the 
board in a few judicious places. I passed this info back to Gary at Elecraft. I 
know of at least one other XV432 that has been stabilized by this method. I 
don't see those mods in the latest XV432 errata sheet, perhaps they vias have 
been added to the latest circuit board or they have found other ways to cure 
the problem.73, Mike, W3IP


--- On Mon, 2/4/13, Tom Warren <mtnest at hartcom.net> wrote:


From: Tom Warren <mtnest at hartcom.net>
Subject: [Elecraft] XV432 - No intermediate pwr output
To: elecraft at mailman.qth.net
Date: Monday, February 4, 2013, 8:15 PM



    I purchased this unit used ( nice workmanship) and it seems to work well in all respects 
except as noted below. I must add that the prior owner told me up front that there
was an issue with its power. However, when I first put it online line it seemed to work ok.

   Originally I used it with my K2/100 to drive a Mirage D1010 (100w) in ssb mode.  As
time passed, the unit started to show signs of loss of power similar to a high swr turn back
or high heat shutoff and I attributed it to a failing relay in the Mirage, which I cleaned and the 
system seemed to again work ok for a while.  After a reoccurrence, I switched to another rig 
for my 432 activities and let the XV432 sit on the shelf while I mulled the issue.

I now have a Flex 5000 online and in the process of interfacing the XV432 with good results
except for the old issue again and I'm determined to figure out the problem since it really seems 
to be the transverter and not the K2 or Mirage.

  The setup;

Flex 5000
Single coax interface
RCA keyline
XV432
Bird 43 (25W slug)
Bird dummy load

Here's what I've found;

1)  As I start the Flexs' drive, the XV432 output turns on at 0w then continues to increase to 2.5w 
       then 'shuts off' and power drops to 0.
2) As I continue to increase the drive, the output power again turns on at about 15w and increases to 20w +.   

I've looked all over the internet for a similar problem but don't find anything. Maybe someone out there 
can point me in the right direction before really hitting the books and at my age gray matter is in short supply ;0).

Thanks in advance for any help.
73
Tom
W4TMW






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