[NLRS] 400 W RCA 220 MHz Amplifiers

[Rex Greenwell]

Hello NLRS -

Due to the number of requests for more information I'll post some specs for
the final transistors here.

The 400 W PEP amplifier is composed of three each 150 W modules.  Each
module contains two RF power transistors.  Therefore a total of six RF
transistors to make up the 400 W amplifier.  Here are the specs for a single
transistor, one each of the six.

Acrian type C2M100-28A.  (Per my contact at RCA I'm told they used as a
substitute CTC type CD4344-2 or RFG type CD3849-MP.  The Acrian transistor
was by far the most common.)
C2M100-28ABipolar NPN UHF-Microwave Transisitor
V(BR)CBO (V)=60
I(C) Abs.(A) Collector Current=12
Absolute Max. Power Diss. (W)=250
RF Output (W) = 100 Minimum
Semiconductor Material=Silicon
MHz: 400 MHz
Amps: 12A
Volts: 60V
Package=RFMOD
Military=N

RCA began producing the "G-Line" transmitter in (about) 1976, they were in
production through 1986 at which time RCA discontinued it's broadcast
transmitter product line.  RCA continues to provide technical support and
parts for this transmitter series as a few are still in use in Canada,
Central, and South America.  http://www.rcatransmitters.com


73 for now ...

Rex K0KP EN36vw

PS  In the original G-Line TTG50H transmitter four 400 W amplifiers were
combined to provide 1600 W PEP output to drive the 8984 final tube at 55 KW
PEP output.  A 1600 W circulator was attached to the solid state output
prior to the tube input, with the third port of the circulator terminated to
a Bird 1 KW dummy load.  In that configuration the solid state arrays saw a
50 ohm load irregardless of what was happening to the tube final amplifier.