MY MAIN HOBBY

Português




The owl, a radio listener symbol.



Ham since 1958, with technical area and electronics and telecommunications development interests, till now few times I had my ham activity interrupted. I've executed many designs and assemblies of several ham equipment, from morse telegraphy to radio packet.
I've also experimented many antennæ types specially for HF and VHF bands, one of those is a Discone antenna with about 13MHz cutoff frequency that operated with high efficiency from 20 to 6m with no adjustment.

In 1964, with another ham, I built an ATV transmitter 'without camera', that is, the camera was designed and home built with no image tube (vidicon, orthicon, etc), only using an ancient projection TV tube (a home made flying spot scanner) and, fortunately, things worked very well.
So, I had always my technical activity operational and, when possible, updated with modern technologies.

The former figure is a TRIO model TR2500 (very ancient) FM HT transceiver photo.

This shows a common simple keyer, also very old.









This other presents an IC board of a VFO frequency (up to 7 MHz) stabilizer. It is one of my successfull electronic design because, with this board, a not synthesized commercial HF transceiver can operate even on packet radio where frequency stability is a must.





My station, now a days, is formed by:

- an HF Kenwood modelo TS-140S transceiver

- a Yaesu modelo FC-301 antenna coupler

- an end fed 160m 1/2 wavelength for 160 and 80m operation

- a 1/2 wavelength inverted-V for 40m

- an all mode Yaesu model FT-480R transceiver for 2m

- an ICOM model IC-229H FM transceiver for 2m

- an 18 elements cross-yagi (9 for each yagi) with 4 polarizations for 2m

- a desktop PC home made computer and an HP laptop

- an MFJ model 1278BT TNC with 2400 e 9600Baud

- a home made 13.8V/30A power supply

More equipment:

- vector impedance meter model AIM-4170 from Array Solutions

- antenna analyser model MFJ-259

- dual channel 20MHz oscilloscope from Hitachi

- spectrum analyser model 411T from HP with tracking generator up to 110MHz

- an RLC Smart Tweezers meter model ST-AD from AdvanceDevices for SMD components

- other meters like frequencymeter, multimeters, etc

- several homebrew devices



               

1