In article ,
"Lynn Coffelt" wrote:

That's what I get for letting my mouth overrun my holeridden memory.
The Konel that I was remembering did have a Klystron, and came in an "up" or
"down" transceiver model. The one on the yacht/halibut boat had the "up"
version and I had to make a test cable to run the transceiver in the pilot
house. It would see a mile or two with the waveguide coupler pointed out the
window. Boss insisted on a dummy load when he was around, but that made the
NE-2 on a stick, or echoes from down the bay unavailable. (I think you
mentioned once that "real" technicians didn't bother with the stick)
I guess I didn't get Furuno tech bulletins farmed out to me in
Anacortes until maybe 1979....... isn't that about the time the "toilet
bowl" went from KRA112 to KRA124? (and about the same time as the phenolic
based boards in the display started burning between lands all over the
place? Best troubleshooting was in a dark room, turning off and on, watching
for glow or sparks. Of course it was hard to see smoke then, but you could
smell it pretty quickly.

Old Chief Lynn



Your confusing the KRA-124/248/448 Series, KRA1121 which preceeded it,
with the KRA-116 (ToiletBowl) and it's later cousins, the KRA-240 and
360. The Toilet Bowls all had HV Breakdown problems on the Main Display
boards, up untill the 240MKII's, when they redesigned the Trace paths
for the HV Section. The KRA-121's had 2K25 Klystrons, and were First
Generation, Marine Radars. KRA-124 Series were the first of the Second
Generation Radars, that had Gunn Diode LO's and the MKII versions had
Ring Circulators, instead of TR Cells. Third Generation Radars had
MMIC's, and Ring Circulators like the 1600's, 2400's and 701/1001 Series.
I put one of the first KRA-116's on the little Harbor Tug Western Towboat
had called the Wasp. It was a preproduction unit and ran for 6 hours
before the Inverter Board in the Powersupply went up in smoke. Old
Man Shrewsbury, wasn't so sure that these Jap Radars were any good after
that fiasco, cause it took a week to get a new board out of the factory
in Japan. Now if you look on any of the Western Towboat Tugs you will
see 100% Furuno Radars everywhere in their Fleet.

Bruce in alaska
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