- 2.3 - 2.4 GHz low noise converter for Phase 3D. Listen to the DOVEsatellite, converter + LNA + 2 turn helix ! ( 200 k )
- 3.4 GHz transverter ( 12 W SSPA, Nf 0.7 dB ) for 9cm EME ( First ever EME QSO from Finland on 05.01.98 ! )
- 2.1 - 2.8 GHz miniature low phase noise synthesizer ( photo here, 60k )
- reworking ( 52k ) Matjaz Vidmar's ( YT3MV ) GPS Quadrature Backfire Helix for 2.3 GHz. Proto by OH2BEA - tnx !
- low noise figure, three stage P-HEMT/GaAs-FET/MMIC LNA ( 38k ) for 2.3 - 2.4 GHz
- BIG file: notes on modifying a C-band feed to 3.4 GHz ( in Finnish )
- BIG file: notes on modifying a C-band LNC to a 3.4 GHz LNA ( in Finnish )
- BIG file: notes on a METEOSAT preamp for 1.7 GHz ( in Finnish )
- designing a 2.4 GHz low ellipticity dish feed for 0.55 f/d dish ( a closer view and the return loss ). Proto by OH2BEA - tnx !
- retuning 1.8 and 2.7 GHz linear microwave radios to the 2.3 GHz ham band
- modifying several Drake PLL downconverters for the 2304/2320/2400 MHz bands
- a CW beacon for 2320 MHz, 2 W out, not QRV yet. Something on the antenna
- a CW beacon for 3400 MHz, 100 mW out, not QRV yet ( photo, 69k, of LO using Bessel Zero method for modulation )
- spread spectrum experiments
- FMATV and AMATV experiments
- broadband linear repeater/beacon under construction, 10 W out, not QRV yet
- a 2.3 GHz transverter based on a design of S53MV
- working on a 2.3 GHz ATV repeater ( 12 W out ), not QRV yet
- 2.3 GHz low f/D dish feed using a Paulig Cafe Parisienne (77k) coffee can ( comes with radome ! )
- 3.4 GHz low f/D dish feed using a Heinz Baked Beans tin can
- 2.3 and 3.4 GHz coaxial subharmonic mixers ( photo of 9 cm mixer here, 113k )
- getting ready for some serious 9 cm QRO stuff, testing a 9 kW avg. water cooled load ( 84k )
- emergency field operations feed (53k) for AO-40, 2.4 GHz, RHCP with dish
- rear detail of the candle can fixture (61k) to the electricians tubing :-)
- copper tape helix (88k) on the electricians tube (LHCP winding)
- out in the field with no test instruments, the matching appears good (sky/ground noise)
- ditto, the ellipticity is terrible, discovered using a fluorescent light as a polarised noise source...
- new feed system reduced ellipticity considerably
- cold sky/ground/inside building noise measurement of the experimental LHCP helix (83k) feed
- cold sky/ground/inside building noise measurement of an experimental linear pol. coffee can (77k) feed
- cold sky/ground/inside building noise measurement of a 2.5 turn RHCP helix (81k) feed
- cold sky/ground/inside building noise measurement of an experimental 3 turn RHCP helix (82k) feed
- cold sky/ground/inside building noise measurement of my 21 t AO-40 RHCP helix (75k)
- cold sky/ground/inside building noise measurement of my 28 cm offset dish mounted converter for 10451 MHz
- outside temp. +12 degrees C, clear sky, inside temperature +21 degrees C, spectrum analyser at 1 dB/division
