RE: [Amps] 4CX1500 à la YU1AW lazy builder ?

[G0RUZ Conrad]

The YU1AW 'lazy builder' amplifiers are a bad idea at those sorts of power
levels in my opinion. They will be inefficient and the use of HF style
blocking caps for 2m amplifiers is a bad idea. Also the output spectrum is
so rich in harmonics that you will need a good low pass filter.

The easiest (and cheapest) way of getting 1.5 KW on 2m is to use a GS35B in
a 1/2 wl coax line type arrangement. There is no blocking cap to fail,
losses are very low, efficiency good and they always work first time.

See http://www.nd2x.net/PA3CSG-2.html for details. Of course a 4CX1500 could
be substituted, in this case ground the screen for the best stability. There
was a design for the 4CX1000 on 2m in the ARRL handbook which explains how
to do this. The GS35B is so cheap and reliable in this design that I would
use it!

73

Conrad G0RUZ

> -----Original Message-----
> From: amps-bounces at contesting.com 
> [mailto:amps-bounces at contesting.com] On Behalf Of Patrick Egloff
> Sent: 21 August 2005 15:33
> To: Amps at contesting.com
> Subject: [Amps] 4CX1500 à la YU1AW lazy builder ?
> 
> Hi All,
> 
> I plan to build a 2m amp with a 4CX1500 after the lazy 
> builder design by YU1AW. 
> <http://yu1aw.ba-karlsruhe.de/PA%20for%20lazy%20build.htm>
> 
> Anyone on this list who tried this before and/or has 
> experiences with it ??
> 
> 73, Patrick TK5EP
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