910mm (you said cm) should do the job but if you want more you might try curtain tracking: it's very flexible and fairly rigid once bent into position. You can join pieces together to get any length y

That's not to say that a number of US manufacturers haven't already moved over to metric. I worked with Caterpillar ~15 years ago and their drawings had metric equivalents in brackets, then latterly,

It might be of interest to some readers to have a look at this link by W8JI https://www.w8ji.com/magnetic_receiving_loops.htm In my limited experience a tuned loop will produce a higher signal on a pa

Hi Tom Alarm bells have just sounded upon hearing that your neighbours have a new kitchen extension. I've heard this so many times now. It is almost inevitable that they have some nice shiny lights in

I'm in the market for these. I have a K9AY in one corner of a field and a pair of flags at right angles in the other corner for diversity reception. This is in preparation for my remote station in a f

Over to you, Chris Is it Class II or III (Roman numerals, ie double insulated, SELV, et al)? What is the purpose of the mains connection to output negative and how does this impact electrical earthing

Thanks David and Martin The supply in question is in a plastic box, so there are no exposed metal parts (that I can see). Wouldn't that make it a Class 2 equipment? My other power supplies (apart from

Thanks to Martin and Chris and all. The leaflets and the regs could go further with more diagrams to explain the various combinations. I can see the point of the regulations but I'm missing why some p

Chris I've been puzzling over the electrical regs for tying antenna earth systems to mains earth and I see that the above psu has mains earth tied to the negative output. I haven't checked all my supp

Understood, perhaps I could bend the elements 45• towards each other? David

Thanks, Chris that sounds like an interesting approach: I could re-position one of the element holders onto an adjacent side of the box and use the original elements. It doesn't give me the noise prop

Hi Chris Is there a way to re-purpose the old Sentinel aerial to your bicycle rim idea? was this: http://www.crosscountrywireless.net/hf_active_antenna.html 73 David G3UNA

I'm guessing a bit that amateurs copied ship-board DF loops and the Bellini-Tosi variety all made to reject the ship's magnetic field, thinking this was the way to do it. W8JI wrote a bit about it and

There are microwave-rated relays that do a good job of 50 ohms and not really expensive if you are in to VHF+ I don't think these things matter much at HF and MF for receiving. It's not about maximum

I would call that a success and a half. Now to tackle that fading... David G3UNA

This site may help a few builders. I just came across it an hour ago and have had only a cursory look. It contains a lot of useful info on other topics as well. You need to scroll down to section 7. h

Simon Re sensitivity / signal strength v f/b ratio: if you have a good amplifier then sensitivity might not be an issue. I would rather reduce strength of other signals getting in to increase signal t

It's been around for a few years now and has undergone a little massaging. Need to take care of the mechanics of stringing wires and cords in the air but I'm told they work well, if quite expensive. S

Simon I'm staggered by your results and you must have some local magic going on to get a noise floor of -140dBm, don't change a thing, you're in a sweet spot. BTW if you can't hide your loops you coul

CCW have been using Cat5 for many years. It is also endorsed by Jim Brown K9YC, something of a guru. David G3UNA