[NLRS] 3.4 and 5.7 GHz Amps

[John Oehlenschlager]

I have 4 NEC 5.7 GHz TWTs with power supplies and 3 AT&T 3.4 Ghz Solid =
State amps for sale.  I also have a 3.4 GHz California Microwave =
amplifier with power supply for sale.

The NEC  amplifier uses a NEC LD 4513 TWT.  The TWT is approximately 2 x =
2 x 10 inches.  The entire assembly with power supply is approximately 4 =
x 12 x 22 inches.  The power supply requires -48 VDC  (anywhere between =
-36 and -72 works) at 3.4 Amps.  It also requires -18 VDC at less than =
100 ma.  The unit is from an NEC microwave system which included a dual =
redundant TR system.  Input and output connections are SMA.  I ran tests =
on all of the units and output power was 15-18 watts CW with less than =
10 milliwatts drive from a Down East transverter.  The units were =
designed for continuous duty and have a heavy aluminum heat sink.  There =
are no fans and the units are extremely quiet.  I have schematic for the =
power supply but no specific TWT information.  Some of the units were on =
5925 or 6125 GHz.  In doing the test, I did not attempt to tune the =
isolators to 5763 so retuning or removal might add a watt or two the =
reading.   ($50 plus shipping)

The AT&T amplifier is from telephone service also.  The unit is 10 x 8 x =
4.5 inches.  It requires +10 volts at 7 A, +5 volts at less than 100 ma, =
and -15 volts at less than 100 ma.  I have tested the units using a Down =
East 3.4 GHz transverter,  with two of the units showing 5.7 watts and =
the third showing 7.0 watts.  Power cable and connection info also =
provided.  ($75 plus shipping)

The California Microwave unit includes the external power supply (-24 =
VDC) and has an output of 7 watts.  It also has a waveguide to N =
adapter. ($50 plus shipping)

I will not be coming to Aurora but could possibly come down to Twin =
Cities area during the week to make a single delivery.  Pictures of the =
equipment are available via email upon request.  =20

        John O.   K0JO





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