[Elecraft] Power Amplifier for K2

[Douglas Westover]

It's that 50 volt 20 amp supply that's a killer!

Doug
W6JD

----- Original Message -----
From: "Tom Mc" <redmen1969 at optonline.net>
To: "Richard Haendel" <rhaendel1030 at inabc.net>; "Elecraft List"
<elecraft at mailman.qth.net>
Sent: Thursday, January 06, 2005 6:58 PM
Subject: Re: [Elecraft] Power Amplifier for K2


>
> 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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