[Elecraft] Need to select a dummy load for K3 TX calibration...(advice?)

[Lee Buller]

Jeff,

The MFJ will work just fine.  I use a similar one from Drake which is air cooled for 100 watts.  You should not put in a KW into the dummy load...but the MFJ would work OK.  MFJ-260C.  At 100 watts out...you can use it for 1.5 minutes.  Or 25 watts continuous.  This should work fine for what you need.

Lee - K0WA


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________________________________
From: "Jeff Hall, W6EZY" <w6ezy at arrl.net>
To: elecraft at mailman.qth.net
Sent: Tue, February 23, 2010 12:13:39 PM
Subject: [Elecraft] Need to select a dummy load for K3 TX calibration...(advice?)

Hello all,

I need help picking out a proper dummy load to use for calibrating my new
K3.  HRO is just up the road and they carry some of the less expensive MFJ
dummy loads -- would these be sufficient? Not looking to spend a lot of
money, but don't want to buy junk either.  What factors should I consider?
I'm assuming oil-cooled dummy loads are more robust, while air-cooled loads
are more compact, but you have to be more careful when operating or they can
burn up more easily.  The K3 manual says this is just a 5W test and I need a
load with low VSWR from 160 to 6.  What is considered "low" SWR? Anything
under 1:5?

If I can get by with the MFJ-260 for just $40, that sounds reasonable to me.

73 de Jeff, W6EZY
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