Attempting to track down a bothersome very intermittant noise and looking for some ideas. Don't have a decent way to record it, but may need to set something up if I cannot make headway. Noise is pul
I would use a handheld shortwave receiver (Grundig E5 or equivalent) and take a walk around the house and neighborhood when the interference is occurring with some regularity. The receiver would be t
I have a Grundig SW rig, but I find the HT (wideband receive w/ AM) with a step attenuator and a small shielded loop to be more useful. Also have a simple coax faraday pickup for in close. The issue
Chris: The random nature of your pulsing interference means you will have to invest more time to find the source. It's not going to be easy and will likely be very time consuming because of its inter
How about building up one of those "doppler shift" antennas? I've seen them used on 2-meters and for close in work I'd think it could be adapted to 20. For years I've chased what at times can be an o
Your description of the sound is similar to the propagation static I got years ago mobile (until I went to a DC grounded matching circuit) on 80 CW. There would be a CLICK ... CLICK... CLICK ... CLIC
Those Doppler shift antennas won't work on noise. They require a carrier, preferably unmodulated, to detect the Doppler shift on while they rotate the array. David Robbins K1TTT e-mail: mailto:k1ttt@
I've never seen the circuitry, but how did the old ADF equipment work? Might it be adaptable with a computer and display to display and overlay on a GPS moving map? 73 Roger (K8RI) __________________
Which one?? old rdf stuff used a loop or ferrite antenna to find a null in strength, Doppler df uses electronically rotated vertical array to generate a synthetic doppler shift and determine directio
I'm referring to ADF, the old set of VHF, vertically polarized dipoles on a pole that you'd see at most major airports. No loop was involved. When you keyed your radio the ADF display would show a li