G3XBM's VLF 5W Earth Mode Beacon |
4 Aug 2011
VLF beacon transmitter schematic
Labels:
earth mode,
qrp,
vlf
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Simple QRP projects, 10m, 8m, 6m, 4m, FT8, 160m, WSPR, LF/MF, sub-9kHz, nanowaves and other random stuff, some not related to amateur radio.
G3XBM's VLF 5W Earth Mode Beacon |
In the last few weeks the F2 MUF has exceeded 50MHz "across the pond" on a few occasions. I would expect this at times at the heig...
7 comments:
Hello Roger
Haver you any plans for the high power amplifier.
I have some TDA2030 IC's , do you know what the maximum output power is for that device.
Tony
Roger
Have you got the winding details for the output matching transformer.
Tony
Tony
The toroid used in mine was an ex-PMR one (used in the Pye M206 audio I think) but a 3C90 toroid should be suitable. Mine has about 10 turns on the primary and around 50 turns on the secondary tapped around every 10 turns. The toroid is about 50mm diameter. I will replace the ex-PMR one with a 3C90 when I next rebuild the unit.
Thanks for the info Roger
Tony
Roger
The TDA2030 is rated for 14 Watts output.
I will try and print the data sheet tomorrow.
Tony
to Roger G3XBM
i have made the VLF Beacon and I just receive from Amidon T200-3 ferrite for VLF , I just wanted to know what is the diameter of the wire of 10 primary and 50 secondary you used.
thanks in advange
Panos sv2mch
Panos, I would use reasonably thick wire (1mm or more) if possible, although at QRP levels it is not too important.
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