On Tue, 13 Apr 1999 17:13:46 -0600 "John T. M. Lyles" <jtml@lanl.gov>
writes:
>
>Istok, distributed by Svetlana here in the states, has a 200 and 600
>watt
>magnetron to generate RF at 915 MHz, +/- 5. Not like traditional S
>band
>magnetrons used in home microwave ovens, these parts have a 7/16 mm
>DIN
>output connector on the tube. Makes circuiting about as easy as
>unpacking
>it, applying cooling, magnetic field, and HV. While magnetrons are
>not
>known for generating coherent RF with low sideband noise, these
>'might' be
>injection locked to a source, to make high power on this band very
>simple.
>Not sure if anyone has done this. I have tried it at 30 KW once, using
>a
>VSWR of a particular phase to 'clean up' the spectrum. Solid state at
>this
>level is still costly. These tubes are 70% efficient, and use about 3
>KV at
><250 mA. The filament power is around 40 watts. Both tubes will push
>in
>frequency as the anode current and power output increase. They are
>specified to handle 3:1 VSWR. The 200 Watt tube has a built in cooling
>fan
>on the electromagnet, and the magnetic field can be tuned to adjust
>the
>output power smoothly.
>
>John
>K5PRO
How would these be applicable to ham use?
Activity on that band is weak signal CW/SSB, ATV and some FM. I run 350W
on 903 and would object strenuously to a magnetron oscillator!
73 Carl KM1H
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