Interesting. I have build 600W amp with four Motorola MRF150 transistors and I
can easily
get 600W output with 7W input. This was tested with input attenuator removed.
Are those Mosfets in KPA500 that much different?
I also would like to purchase the KPA500 but only if I could get 15 dB gain.
It
On 3/16/2012 9:59 AM, mark roz wrote:
Interesting. I have build 600W amp with four Motorola MRF150
transistors and I can easily get 600W output with 7W input.
Well, after a little more research (finding the KPA-500 schematics on
the FCC web site) ... there is a fixed attenuator between the
Olli,
Would adding a low gain broadband linear amplifier between the KPA500's
input and the 10 watt driver be a useful alternative to modifying the
KPA500?
I assume that during receive this amplifier would have to be bypassed.
73,
Geoff
LX2AO
On March 15, 2012 at 23:32 +0100, Oliver Dröse
Removing this part of the circuit will definitely void the warranty. It
is part of both the input overdrive protection for the amp and also
stabilizes the input SWR as seen by the driving radio. It's also
important for amplifier stability.
We also check for excessive gain in the amplifier's
16, 2012 5:09 PM
Subject: Re: [Elecraft] KPA-500 high gain modification?
Olli,
Would adding a low gain broadband linear amplifier between the KPA500's
input and the 10 watt driver be a useful alternative to modifying the
KPA500?
I assume that during receive this amplifier would have
Thanks for the inside view, Eric! Much appreciated.
73, Olli - DH8BQA
- Original Message -
From: Eric Swartz - WA6HHQ, Elecraft e...@elecraft.com
To: Joe Subich, W4TV li...@subich.com
Cc: elecraft@mailman.qth.net
Sent: Friday, March 16, 2012 6:09 PM
Subject: Re: [Elecraft] KPA-500
Hi,
Is it any simple way to modify KPA to drive full power
with KX3? I see VRF2933 have minimum 20 dB gain.
Looks like killer combination.
I know there is some PA gain rectrictions in US, but
many of us are not covered by it ;)
73
Arunas LY2IJ
responsibilities and tighting ourselves to non-disclosure to get the
schematics. ;-))
Vy 73, Olli - DH8BQA
http://www.dh8bqa.de/
- Original Message -
From: Arunas LY2IJ ly...@qrz.lt
To: elecraft@mailman.qth.net
Sent: Thursday, March 15, 2012 7:42 PM
Subject: [Elecraft] KPA-500 high gain
On Thu, 2012-03-15 at 21:54 +0100, Oliver Dröse wrote:
...
Three big reasons I can think of that Elecraft does not want to release the
schematics:
a.) To keep them hidden for the competition (quite understandable).
b.) It would probably put down sales of the KPA3 a bit (hmmm).
c.) If
it for 10 watts drive for full output!
73, Olli
- Original Message -
From: Alan Bloom n...@sonic.net
To: Oliver Dröse dro...@necg.de
Cc: elecraft@mailman.qth.net
Sent: Thursday, March 15, 2012 10:58 PM
Subject: Re: [Elecraft] KPA-500 high gain modification?
On Thu, 2012-03-15 at 21:54
...@necg.de
Cc: elecraft@mailman.qth.net
Sent: Thursday, March 15, 2012 10:58 PM
Subject: Re: [Elecraft] KPA-500 high gain modification?
On Thu, 2012-03-15 at 21:54 +0100, Oliver Dröse wrote:
...
Three big reasons I can think of that Elecraft does not want to release
the
schematics
in a heartbeat if I knew I could modify
it for 10 watts drive for full output!
73, Olli
- Original Message -
From: Alan Bloomn...@sonic.net
To: Oliver Drösedro...@necg.de
Cc:elecraft@mailman.qth.net
Sent: Thursday, March 15, 2012 10:58 PM
Subject: Re: [Elecraft] KPA-500 high gain
12 matches
Mail list logo
