Power Amplifier for K2

[Richard Haendel]

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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[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 <[hidden email]>
To: [hidden email] <[hidden email]>
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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[Douglas Westover]

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

Doug
W6JD

----- Original Message -----
From: "Tom Mc" <[hidden email]>
To: "Richard Haendel" <[hidden email]>; "Elecraft List"
<[hidden email]>
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 <[hidden email]>
> To: [hidden email] <[hidden email]>
> 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
>
>
> _______________________________________________
> Elecraft mailing list
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> You must be a subscriber to post to the list.
> Subscriber Info (Addr. Change, sub, unsub etc.):
> http://mailman.qth.net/mailman/listinfo/elecraft
>
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>
> _______________________________________________
> Elecraft mailing list
> Post to: [hidden email]
> You must be a subscriber to post to the list.
> Subscriber Info (Addr. Change, sub, unsub etc.):
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>
> Help: http://mailman.qth.net/subscribers.htm
> Elecraft web page: http://www.elecraft.com

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