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1- 900MHz 150 Watt Linear Power Amplifier This is a linear power amplifier used in an AMPS (or CDMA ?) cellular telephone system. Unit is built by Motorola and is their P/N STF2520A and is listed as FINAL AMP LOW POWER. But, would make a great amateur 902 or 903 MHz linear for moonbounce, repeater use, etc. Has two stages of gain, first is MRF897, the final stage is a MOT MRF899. The final is rated at 150 watt (PEP) output in class AB service. Supply voltage is 26 volts. Connector panel is just a drop-in plate and is easily replaced with a customized unit. The circulator on the output is spec'd to 904 MHz, so should work for 902 or 903 OK. Layout of the RF section is quite straight forward with just Vcc, bias, and I/O connections. Reports indicate that you can get 100 watts out with just a couple of watts input. Check out the VHFSouth website for their modification of this amplifier. Unit weighs 8.5 pounds and is almost all cast aluminum. The transistors are soldered to a copper heat spreader (that is the same size as the white substrate) that is screwed to the heat sink. Click on any image for a more detailed view. Click on any image for a more detailed view. Click on any image for a more detailed view. Click on any image for a more detailed view. Click on any image for a more detailed view. Click on any image for a more detailed view. Click on any image for a more detailed view. * Our hours of operation are M-F 8-5 except 11-12:30 closed for lunch MST (STF2520 900MHZ 150 watt linear power amplifier MRF899 was posted and is owned by: Jaime Farmer) |
JaimeFarmer@chicagopartsnetwork.com (Jaime Farmer) for more information.
