Hits
50MHz to 28MHz RX Converter
The concept of the rx converter is quite simple and nothing really new. the local oscillator is a standard colpitts crystal oscillator producing the 22mhz lo signal
post 01 Sep 2024
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Variometer Loading Coils for LP AM operation
LPAM antennas are more difficult to construct than their LPFM cousins. Firstly, they have to be longer. Secondly, they have to be vertical to work well which becomes an issue if the antenna is longer) Thirdly, they need to have rather long ground radials for the same reason
Voice Keyer vacile da usare e da costruire
Decisi quindi di costruirne uno semplice
Yaesu FT-817 abilitazione alla trasmissione continua
Puo' essere modificata per abilitarla a trasmettere sull'intero spettro delle HF
The Skew-Planar Wheel Antenna
This antenna, constructed by VE3BYT, was built for the beacon VE3WCC on 903.370 MHz in Ottawa, Canada
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LPAM antennas are more difficult to construct than their LPFM cousins. Firstly, they have to be longer. Secondly, they have to be vertical to work well which becomes an issue if the antenna is longer) Thirdly, they need to have rather long ground radials for the same reason
Decisi quindi di costruirne uno semplice
Puo' essere modificata per abilitarla a trasmettere sull'intero spettro delle HF
This antenna, constructed by VE3BYT, was built for the beacon VE3WCC on 903.370 MHz in Ottawa, Canada
23cm Yagi Antenna building Finished antenna at 1275 MHz SWR under 1:1.5 at resonant frequency
50 MHz preamp Gain 26dB with the BFG135 Preamps for 144 and 430 MHz, for 50 MHz, the BFG135a is a cheap transistor and in my view rather strong. It is not easily damaged by static discharge or RF power. FG connection
30 Volt Computer Power Supply Stack A bonus was that i discovered that these did not need a standby load connected to the supply to keep them running just apply mains power and close the Start lead to ground