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Author Topic: Dual (multiple) frequency beacon  (Read 825 times)

Offline Quinta

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Dual (multiple) frequency beacon
« on: July 25, 2023, 1955 UTC »
Because propagation changing from day to night i try to make dual frequency and simple transmitter for qrp beacon. I try diode commutator and it works.
Beacon powered from 5v 350 ma solar panel and 3V 6A/H lifepo accumulator. Because my controller know voltage on solar panel he will switch frequency on twilight and dawn, it even can be done by primitive voltage comparator, without any programming

« Last Edit: July 25, 2023, 2000 UTC by Quinta »
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Offline Teotwaki

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Re: Dual (multiple) frequency beacon
« Reply #1 on: September 09, 2023, 1535 UTC »
Possibly use a half wave end fed that could resonate at a few frequencies. Also try a simple AD9833 DDS board instead of crystals to allow for multiple frequencies to be controlled by the ATtiny chip
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Jim
NRD-525, Elecraft KX3 and Elecraft PX3 Spectrum Display
76' end fed long wire & 66' off-center fed dipole for 10/20/40 meters
Orange County, SoCal, The better half
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