[Elecraft] High Altitude Solder

[EricJ]

I was impressed with the added performance from using HA solder on my K1 SN
1976 at altitude, but I thought the advantages were quickly lost from having
to store the K1 in an altitude chamber when I got home. I'm not seeing the
full 22% increase that some are seeing since the mountains around here are
limited to around 11,000+'.

I built my chamber from an old Pelican case and a C&H dry vane vacuum pump.
I stick a pocket altimeter inside to monitor "vacuum" and maintain it at the
18,000' specified for HA solder in long-term storage. I have a quick
disconnect fitting so I can unplug the Pelican case from the pump and it
maintains "altitude" long enough for me to get back to the mountains.
Details on my web site.

Eric
KE6US
www.ke6us.com 

-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Lynn Burlingame
Sent: Saturday, April 01, 2006 9:58 AM
To: Elecraft at mailman.qth.net
Subject: [Elecraft] High Altitude Solder

I plan to do a lot of mountaintopping in the next few years and will be
assembling a K1 for this specific use.  I need to locate a good source for
MILSPEC high altitude solder that meets Elecraft's specifications and will
not void the warranty.  The reported 22% increase in equipment efficiency
will make the extra expense worthwhile.  Does anybody know of a vendor that
still sells it?  Are there any special precautions or procedures for using
this solder?

Lynn
N7CFO
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