[Amps] Sad State of the Hobby

[John Simmons]

No

> Frank Kirschner <mailto:frank.kirschner at 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 at 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 at 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 at contesting.com] On Behalf Of Lee Bahr
> Sent: Thursday, January 18, 2018 7:08 PM
> To: amps at 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 at 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 at 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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