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Latest Posts

Topic Author Posted On
Experimental QRM triangulation tool. W7KKX 6 days, 5 hours ago
Nice idea! Alas, my beamwidth on 20M is many degrees, so it would be hard to determine a target bearing very accurately. You need receivers located on a wide range of bearings, etc. Antenna arrays (4 squares?) that can be accurately nulled might give better results than simple beams. (But how do you calibrate them?)

It will be interesting to see what you can do with ordinary equipment -- and ordinary hams!

73 Martin AA6E
virtual radar WB4URP 4 weeks ago
I agree it's not there. You would need to contact the author or the sdrsharp project.

73 Martin AA6E
What is an accepted range for a DX contact? WN6WJN on 17/4/14
For the HF bands (below 30 MHz), usually called "short wave", we have long-distance propagation thanks to bouncing signals off the ionosphere. On these frequencies, the usual idea of "DX" is contacting someone in another country. So US-Canada is "DX" by this measure, even if the distance can be very short. And Maine to California would not be DX.

ARRL has the concept of a "DXCC entity" and people try to contact as many of them as possible. They are generally countries, but some non-countries, like Alaska and Hawaii, are considered separate entities. Check out

73 Martin AA6E
WiFi Remote Control KS5KIP on 15/4/14
The "Internet" is just a bunch of connected networks, and each one is like your own local wi-fi network. Any remote control system that works over the Internet is presumably using TCP/IP (or UDP) protocols that would work equally well on your local network. So that shouldn't be a problem. The easiest remote arrangement for the radio would be to get a radio that directly supports Ethernet remote operation - for control and audio in/out. But that's only part of the problem. You may need other functions for antenna switching, rotators, etc.
Distance two antennas should be apart WV0L on 13/4/14
The antennas will interact if they run parallel, but maybe not too badly. Spacing shouldn't matter very much. You may have to adjust the length of the 6M dipole to get it to resonate where you want. The interaction is much less if the wires are at right angles, and you would get an intermediate case with 45 degrees.

You could try just tying the 6M dipole across the existing G5RV feed point, making a fan dipole of sorts. The ladder-line matching section will probably be wrong for 6M, but it might still be worth a shot. It would save you the duplexer and additional coax.

This can all be modeled with EZ-NEC, if you want to get into that (fairly tricky) software.

73 Martin AA6E

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