[Moon-net] REMEC RMX T 80 100 14 Amplifier for 23 cm

[Paul Chominski]

Hi All,
Most of high power transistors with inrternal matching have poor performance 
( low efficiency) on half of the designed frequency. Output matching circuit 
is designed to limit gain at half frequency in order to suppress subharmonic 
parametric oscillations. Old bipolar transistors BLV101 having 100W out at 
900 MHz does not work at 432 MHz. The best I could get was 40W out with very 
narrowband matching and low efficiency.
I suspect that transistors for WCDMA / UMTS designed for 2.1 GHz will 
probably have poor performance at 1.3 GHz.
I am interested in practical experience with modifications of 2 GHz SSPA's 
to 1.3 GHz band.

GL 73 Paul WA6PY



----- Original Message ----- 
From: "Andreas Haefner" <dj3jj at gmx.net>
To: <moon-net at list-serv.davidv.net>
Sent: Sunday, November 04, 2007 11:39 AM
Subject: [Moon-net] REMEC RMX T 80 100 14 Amplifier for 23 cm


>I did buy 2 CAT Amplifiers from Remec RMX / T 80 10014.
>
> They are using 2 x MRF 21125 LDMOS-Fets in the final stage.
>
> Has anybody modified this amplifier for 23cm ?
> I think this amp is usable without any changes on 13cm.
> Normally 2 x MRF21125 should deliver about 250 W out CW at 2.3 GHz.
>
> Amplifier is with build in DC/DC Converter and Heat Sink Housing
> as a 19 " rack unit and external ethernet control.
>
> Any hints including schematics are welcome.
>
> 73s Andreas DJ3JJ
>
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