[AMPS] N conn

[John T. M. Lyles]

Last century I came upon a system where type N connectors were 
constantly failing. They were used on the output connectors on RCA 
Y-1086 and Y-1070 cavities, which use 7651 tetrodes at 200 MHz. The 
highest power was about 5 kW peak, and 12% duty factor. This is about 
600 watts average power. Being the drivers for another stage, they 
were subjected to VSWR during tuning of the grid input tuner for that 
state - and no isolator was present. The original cavities were rated 
for the peak but not the average (only 6% DF), and someone TURNED 
THEM UP.  The input to the next stage also had N. We removed the N 
and replaced with Shuner 7/16 DIN connectors and mating cables. We 
replaced the Jones micromatch Directional couplers (having N 
connectors) with Weralatone couplers having the 7/16 DIN connnector. 
We got rid of the 7651 and went MOSFET for the 5500 watt stage 
(MRF151Gs). End of problem. Never had another connector failure since 
1995 changeover.

john
K5PRO

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