Actually, for your communication purposes, do you need a stable frequency? If Tx and Rx both lock to BBC Radio 4 or MSF or whatever, it doesn't matter if it drifts. Both amateur Tx and Rx drift toge
Yes, but they disappear between 8970.03 Hz and 9876.57 Hz - that's a very small band for anything to knock them out. It's 0.00105 of an octave. If something is acting like a low-pass filter, at 6dB/o
More info here, including a nice coverage map. 100w goes a loooong way... At least, when one realises that 120 nm means nautical miles, not nanometres ;-) Many of those long distances are at aircraft
Dear All, When a scientist builds a bridge it will collapse, but the scientist can perfectly explain why it collapsed. When an engineer builds a bridge it will not collapse, but the engineer will not
Mal and others, ... as did cheap-and-nasty push-button car radios. (Well, they probably weren't nasty by the standards of the day, and certainly not cheap.) You pulled out the push-button (which I th
Hi Mal and others, It would be interesting to know if their reports of other Txs have changed over the same time. In other words, is it a change in their sensitivity (whether due to Ae change, pre-am
Hi Mal, 'Is', but not always 'was' ;-) There used to be 'live chassis' radios and TVs with the single-pole mains on/off switch between the chassis and the neutral lead. Turn it off and the chassis wo
Hi Alan, Thanks for your thoughts. I seem to recall that both MF and LF stations had been at 9 kHz spacing long before that. The change was to shift the frequencies to integer multiples of 9 kHz. The
Hi Chris, Thanks for your post. A couple of thoughts: To some extent, as get older we may know more of the basic and intermediate stuff which we learnt years ago from magazines. Also, it may be that
Hi Mal, It certainly is! Can you put us in contact? Email is good; my mobile is 07710 721584. Mni tnx, Chris -- Dr Chris Trayner School of Electronic & Electrical Engineering, The University of Leeds
Dear All, I'm having a clearout and have decided to get rid of my old RSGB Bulletins and RadComs. They are a nearly complete run from sometime in the mid 1960s to the present (though I may keep the l
Hi Mal, Can you give me his contact details? I'd like to get them to him soon. 73, Chris G4OKW -- Dr Chris Trayner School of Electronic & Electrical Engineering, The University of Leeds, Leeds LS2 9J
Hi Steve, I assume you're satisfied that the problem is with the meter, not the circuit sending it a naughty current. I'm also assuming it's a moving coil meter. Three suggestions. Apologies if you'r
Dear John, I have some photos of Anthorn, where the Rugby Loran is moving to. I've already sent them to the editor of the Cave Radio & Electronics Journal so, if it was him asking you, he's got them
Hey, I've got this great idea. Rather than compress speech, why not render the message simpler? Rather than the sounds you could just send the text, encoding the letters in some way. You could turn t
