Frank Kirschner <mailto:frank.kirschner@gmail.com>
Friday, January 19, 2018 11:57 AM
John,
Do the kits include finished sheet metal? I no longer have facilities
for producing cabinets and chassis.
73,
Frank
KF6E
John Simmons <mailto:jasimmons@pinewooddata.com>
Friday, January 19, 2018 11:13 AM
I am in the process of building an amp from Jim's kits. The boards and
kitting are very good, and he replys to emails right away. I am happy
to correspond with anyone also building Jim's stuff.
73,
-John NI0K
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David Smith <mailto:w6te@msn.com>
Friday, January 19, 2018 10:31 AM
Hi Lee,
Go to Jim's website. State of the art designs and kits available.
www.w6pql.com
73,
Dave W6TE
-----Original Message-----
From: Amps [mailto:amps-bounces@contesting.com] On Behalf Of Lee Bahr
Sent: Thursday, January 18, 2018 7:08 PM
To: amps@contesting.com
Subject: [Amps] Sad State of the Hobby
A friend of mine has been getting himself interested in building a
super Full legal limit solid state amplifier. What is catching his
attention are the relatively low cost high power FETs available out
there. I know he is looking at the modules available from some
Russian on eBay. He has started to get me interested but I am no
design engineer. This evening I started researching this topic on the
internet and was amazed at the lack of good info on the subject.
Stuff there is 10 to 15 years old. I did a search at the ARRL web
site and they have a 1000 watt amp article in their QEX magazine but
that was way back around 2002 or so. OLD TECHNOLOGY! What is this?
Nothing for 15 years? I knew the ARRL was falling behind in their
technical articles but 15 years with no amp construction article?
Man, this is truly sad! I suspect there are no decent articles on
building one anywhere. This hobby has truly sunk to a new low. Guys
can't even build their own dipoles anymore. I admit I am no design
engineer but I can still build stuff. Even on this reflector I can't
remember any talk about modern day amps and how to build one using the
newly offered high powered FETs.
Lee, w0vt
---
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Lee Bahr <mailto:L@w0vt.us>
Thursday, January 18, 2018 9:08 PM
A friend of mine has been getting himself interested in building a
super Full legal limit solid state amplifier. What is catching his
attention are the relatively low cost high power FETs available out
there. I know he is looking at the modules available from some
Russian on eBay. He has started to get me interested but I am no
design engineer. This evening I started researching this topic on the
internet and was amazed at the lack of good info on the subject.
Stuff there is 10 to 15 years old. I did a search at the ARRL web
site and they have a 1000 watt amp article in their QEX magazine but
that was way back around 2002 or so. OLD TECHNOLOGY! What is this?
Nothing for 15 years? I knew the ARRL was falling behind in their
technical articles but 15 years with no amp construction article?
Man, this is truly sad! I suspect there are no decent articles on
building one anywhere. This hobby has truly sunk to a new low. Guys
can't even build their own dipoles anymore. I admit I am no design
engineer but I can still build stuff. Even on this reflector I can't
remember any talk about modern day amps and how to build one using the
newly offered high powered FETs.
Lee, w0vt
---
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John Lyles <mailto:jtml@losalamos.com>
Thursday, January 18, 2018 1:38 AM
Polyfet has a 2014 technical bulletin on their website, TB239. It uses
their LY942 LDMOS transistor to make a flat 2-30 MHz 400 watt linear
amplifier with 20 dB gain, using 50 volt parts. Its a compact layout
and there is a full parts list along with plots. Has anyone built one
of these? Its not 1200 or 1800 watts, but has decent 3rd order IMD
results listed.
73
John
K5PRO
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