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HB9BLF Switzerland flag Switzerland

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Ham Member Lookups: 3627



All QSL cards through the buro are welcome, and I will respond also through the buro.

My main activity as radio-amateur is building radio equipment and antennas. Radio operation from home mostly on 144MHz, 50MHz and (in winter) on 7MHz using home-made equipment.

The base station is a 144MHz transceiver having 9MHz IF and "KVG" XTAL-filters. The receiver has an analog VFO delivering 4-6MHz, that is upconverted to 135-137MHz through a mixer and a XTAL oscillator. the 135-137MHz LO signal is injected at high level (+27dBm) in the down-converter mixer. The TX part have power mosfets at output delivering up to +43dBm, with power control in 1dB steps.

Operation on short waves is via a converter that up-converts in RX the band of interest (80M to 6M) to 144MHz, and in TX down-converts the 144MHz to short waves. The LO is made by a switchable bank of XTAL oscillators (141 - 94MHz, one oscillator per band).

No memories, no microprocessors inside; an "old-fashioned" radio...

The power amplifiers use a pair of good old tubes 4CX350A; in push-pull on 144MHz, in parallel for the short wave TX (from 3-30MHz).

Antennas: I like the designs of G0KSC; for 144MHz, I have built a 13EL LFA (8m boom length) and for 50MHz a 6EL LFA (about 7m length).

On 7MHz, a "Delta-Loop" for TX and a small 2m diameter loop for RX with a broadband current preamplifier (on the same rotator than the 2m beam)

Club affiliation: USKA and SUNE. See the website www.hb9ww.org for technical articles, our club activities and the journals "SUNE-Telegraph"

Best 73 and enjoy HAM radio in good HAM Spirit

François, HB9BLF


6301234 Last modified: 2015-07-16 00:29:13, 2313 bytes

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