K9AY LOOP SWITCH AND PREAMP
Description: Two board set consist of a loop antenn switch and switch impedance load board and a bandpass filter/preamp board. The chip capacitors are furnishedwith theboard. To see the boards click, to see the schematic click, to see the parts list click, tto see chip part locations click.
432-435
GaAsFET 70CM PREAMP, 15db, .55dbNF
ARRL HB CHP 32 FIG 1
Description: This preamp offers good noise performance and gain and is suitable for terrestrial, EME, and satellite applications at 432 to 435 MHz. Gain is approximately 15db, with a noise figure of .55db. The GaAsFET is a Mitsubishi MGF1402
QST Nov97
Description: DC to Daylight, not quite!.The circuit uses a Mini-Circuits Lab MAR-6 that has a gain bandwidth from dc to approximately 2000Mhz with 20Db gain. The author's notes give examples of using the circuit at 432 and how to add a bandpass filter to the board. The board comes on G-10 but is available on Teflon for an increased price
QST SEPT'01
Description: This is a two board set consisting of a power supply board and a pre amp board. The amp is designed for 136 kHz but works from 10 kHz to 30 Mhz. The amp consists of a CP666 JFET with variable gate bias. The amp board is 7" x .75" and the PS board is 4.25" x 2.6"
QEX 6/04
Description: The circuit is based on Mar-6 device and 78L07 regulator The parts are all surface mounted. The price includes the chip capacitors and the chip resistor, the preamp board and the 6 boards for the housing.
updated: OCT 9, 2006