FOR SALE: Skywalker 500 HF Amplifier This is their later model amplifier...
* 500W output 160-10M 12 VDC power required - but really likes 13.8 V DC * Power output: SSB 500W PEP * CW/FM 500W (at 50% duty cycle) * Drive power for rated output: 20-40 W typical, 35 watts is the sweet spot. * Frequency range: 1.6-30 MHz continuous * Max. input current: 75A * Efficiency: 50-55% avg * Duty cycle:SSB Continuous voice modulation; CW/RTTY 50% * Keying: PTT line, 10 mA sinking to ground via RCA jack, RF sensing. Works FB with all adjustable 100 watt class rigs. * T/R switching time: 20 mS * Operating class: AB with separate regulated bias circuits for each module * Modes supported: SSB/CW/RTTY/AM/FM * Thermal protection: 130 F limit switch, auto reset * Cooling: Two 120 mm muffin fans on heatsink and one 60mm muffin fan internal * Metering: Collector current for each module. * Transistors: 4-2SC2879 * Input/Output Impedance: 50 ohm unbalanced, VSWR 2:1 max * RF connections: SO-239 sockets on rear * Power connections: 3/8" Dia. bolts for + and - * Dimensions: 6.5"H x 12"W x 7"D Looks to be new and unused, but will sell as used. Covers the HF amateur bands in two switchable ranges. The circuit is the same as AN-762 from Motorola and is very similar to the 500 watt amp by MFJ using the same 2SC2879 transistors. New price was around $600.00 for this powerful amplifier. Used ones have sold in the range of $385.00 - $550.00 - this one is far less. I know this is not for everyone, and it could use some extra RF filtering, but it does work and is a nice heavy duty 500 watt ouput HF amlifier at a great price. Available for $250.00 FIRM plus shipping. ALSO available - ASTRON RS50M power spply in excellent working condition. 13.8V DC at 50 amps! Ideal for this amplifier. Will sell for $189.00 FIRM plus shipping. Pictures and details available at: http://af4k.com/radios.htm 73 - Bry Carling, AF4K _______________________________________________ Boatanchors mailing list Boatanchors@puck.nether.net https://puck.nether.net/mailman/listinfo/boatanchors