KPA500

[P.B. Christensen]

> "I would also think it will be built around MRF-150 FET's?"

Four years ago, the prototype KPA800 used eight APT ARF 463 transistors
(four per RF board).  Each plug-in board would be field serviceable.  The
prototype KPA1500 in effect doubled the number of boards and transistors.

http://www.n6ie.com/Elecraft.html

I like "bolt-on" high-power transistors that use a small PC board slightly
larger than the transistor for the soldered leads, then that PC board bolts
down (e.g., using #10 machine screws) to the main RF board.  If a transistor
needs replacement, one simply unbolts the small PCB from the main board
without inflicting heat/shop tool damage onto the main board.

Paul, W9AC

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[Joe Planisky]

Nah.  It'll be 500 2N2222's.  Wayne had a bunch left over from some  
QRP projects and had to find a way to get rid of them.  :-)

33-1/3
------
Joe KB8AP



On Apr 16, 2010, at 2:28 PM, Paul Christensen wrote:

>> "I would also think it will be built around MRF-150 FET's?"
>
> Four years ago, the prototype KPA800 used eight APT ARF 463  
> transistors
> (four per RF board).  Each plug-in board would be field  
> serviceable.  The
> prototype KPA1500 in effect doubled the number of boards and  
> transistors.
>
> ...

> Paul, W9AC
>

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[k6dgw]

Joe Planisky wrote:
> Nah.  It'll be 500 2N2222's.  Wayne had a bunch left over from some  
> QRP projects and had to find a way to get rid of them.  :-)

Thank you Joe, a breath of humor

73,

Fred K6DGW
- Northern California Contest Club
- CU in the 2010 Cal QSO Party 2-3 Oct 2010
- www.cqp.org
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[Joe Subich, W4TV-4]

Joe,

You missed the news ... just a push-pull 2N2222 pair with
liquid nitrogen cooling.

73,

   ... Joe, W4TV
 

> -----Original Message-----
> From: [hidden email]
> [mailto:[hidden email]] On Behalf Of Joe Planisky
> Sent: Friday, April 16, 2010 7:05 PM
> To: Elecraft Elecraft
> Subject: Re: [Elecraft] KPA500
>
>
> Nah.  It'll be 500 2N2222's.  Wayne had a bunch left over from some  
> QRP projects and had to find a way to get rid of them.  :-)
>
> 33-1/3
> ------
> Joe KB8AP
>
>
>
> On Apr 16, 2010, at 2:28 PM, Paul Christensen wrote:
>
> >> "I would also think it will be built around MRF-150 FET's?"
> >
> > Four years ago, the prototype KPA800 used eight APT ARF 463
> > transistors
> > (four per RF board).  Each plug-in board would be field  
> > serviceable.  The
> > prototype KPA1500 in effect doubled the number of boards and  
> > transistors.
> >
> > ...
>
> > Paul, W9AC
> >
>
> ______________________________________________________________
> Elecraft mailing list
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>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>

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[juergen piezo]

Hi Joe

Whatever devices  it uses lets hope that the IMD performance is above average. The last  thing we need is another expensive amplifier that is no better than the average  cheap CB amp.

What devices does the KPA500 uses?

John
--- On Fri, 4/16/10, Joe Subich, W4TV <[hidden email]> wrote:

> From: Joe Subich, W4TV <[hidden email]>
> Subject: Re: [Elecraft] KPA500
> To: "'Joe Planisky'" <[hidden email]>, "'Elecraft Elecraft'" <[hidden email]>
> Date: Friday, April 16, 2010, 10:06 PM
>
> Joe,
>
> You missed the news ... just a push-pull 2N2222 pair with
> liquid nitrogen cooling.
>
> 73,
>
>    ... Joe, W4TV
>  
>
>
>
> > -----Original Message-----
> > From: [hidden email]
>
> > [mailto:[hidden email]]
> On Behalf Of Joe Planisky
> > Sent: Friday, April 16, 2010 7:05 PM
> > To: Elecraft Elecraft
> > Subject: Re: [Elecraft] KPA500
> >
> >
> > Nah.  It'll be 500 2N2222's.  Wayne had a
> bunch left over from some 
> > QRP projects and had to find a way to get rid of
> them.  :-)
> >
> > 33-1/3
> > ------
> > Joe KB8AP
> >
> >
> >
> > On Apr 16, 2010, at 2:28 PM, Paul Christensen wrote:
> >
> > >> "I would also think it will be built around
> MRF-150 FET's?"
> > >
> > > Four years ago, the prototype KPA800 used eight
> APT ARF 463
> > > transistors
> > > (four per RF board).  Each plug-in board
> would be field 
> > > serviceable.  The
> > > prototype KPA1500 in effect doubled the number of
> boards and 
> > > transistors.
> > >
> > > ...
> >
> > > Paul, W9AC
> > >
> >
> >
> ______________________________________________________________
> > Elecraft mailing list
> > Home: http://mailman.qth.net/mailman/listinfo/elecraft
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> > Post: mailto:[hidden email]
> >
> > This list hosted by: http://www.qsl.net
> > Please help support this email list: http://www.qsl.net/donate.html
> >
>
> ______________________________________________________________
> Elecraft mailing list
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