[Elecraft] Power Amplifier for K2

[Tom Mc]

Hi Rich and all,

This is an very impressive and reasonably priced project...unfortunately my
neighbors seem to like the fact that I'm qrp...but I'm thinking about it.
Only needs 6 watts to drive, too and the low pass filters are also available
quite reasonably.

Is about $60.00 a pop (poor choice of words?) about right for the MRF-150's?

Tom
WB2QDG
K2 1103
-----Original Message-----
From: Richard Haendel <rhaendel1030 at inabc.net>
To: elecraft at mailman.qth.net <elecraft at mailman.qth.net>
Date: Thursday, January 06, 2005 9:53 AM
Subject: [Elecraft] Power Amplifier for K2


For those who think life is too short to do QRP all the time, here is what I
did.  I made an amplifier similar to the amp in Communication Concepts web
page, specifically the Motorola EB-104 Amplifier (kit!) that uses 4 MRF-150
transistors.
See www.communication-concepts.com/eb104.htm.  I use 48 volts supply voltage
and keep the 48 volts on all the time. I use the 8R line of  the K2 with the
keying circuit mentioned several times in this reflector.  I built a set of
low pass filters for the bands I operate, that is 40M, 20M and 17 M.  I get
about 500 watts out of the amplifier after the low pass filters and the
relays.  I use a 2 element wire beam up 35 feet so I don't have a huge
signal but the audio compression in the K2 really helps a lot.  It sure is
nice to break a pileup on 20M phone with one call when the band is open to
Africa!!

If anyone needs more info, please e-mail me for more details.

73 Rich, W3ACO


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