28 November 2012

Keyer "in crosta di sale"

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CQWW CW contest is one of those events that can be tackled with a simple 2- memory keyer : callign in one, "CFM 599 TU " in the ot...
27 November 2012

Troubleshooting the biquad

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F irst thing I checked on the biquad was the continuity of the coax+antenna setup. Electrically the quad is a short circuit, so meas...
21 November 2012

Nothing beats the good ol' dipole(?)

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L ast night I monitored 1296 MHz with the RTLSDR receiver and the homebuilt biquad antenna, fixed in one direction. Apart from a strong stat...
16 November 2012

23cm biquad simulation

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B efore assembling my 23 cm biquad antenna I wanted to know what happens when loop-to-reflector spacing is reduced . In theory, at least. ...
14 November 2012

23cm biquad spacing

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As 1296 MHz receive only antenna I have chosen to try a biquad (or dual-quad). It is composed of two full-size quadriangular loops (23cm pe...
12 November 2012

10m and 30m are not harmonically related

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S ince a week I have switched my antenna from 10m to 30m, to be able to use some after-sunset propagation. On 30m it is composed of a 3.8m l...
05 November 2012

RTLSDR as a (cheap) lab spectrum analyzer

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W hile listening to a local repeater with RTLSDR (sdr# software) I spotted a strange oscillation in the output carrier. I didn't me...
30 October 2012

Bluetooth CAT for Yaesu FT1000 mark V

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A HAM contacted me to have one of my CAT-to-bluetooth dongles for his Yaesu FT1000 mark V. Well, that's a transceiver I have only heard...