Sorry Steve Belay my last please., I read the wrong receiver spec and apologise for any inconvenience Best Wishes Paul

Hi Steve I am in the UK. I would be keen to buy your SDR 4+ if it's still available. It's just what I was looking for. Best Wishes Paul

http://www.crosscountrywireless.net/sdr_receiver_old.htm Regards, Chris

Hi Steve, I have found info online about the first item, but not the second one. Any links? Tempted. Paul G0VKT

I hope an advert is allowed here? If not please delete and accept my apologies. For Sale: CCW SDR 4+ HF Receiver £60 posted to the UK CCW Experimenters special SDR receiver £30 posted to the UK I

I hope that you find one, Nick. As well as the LF version of the SDR-4 you could also look for the Sentinel 4 receiver. That receiver covered the full frequency range of the standard and LF versions

Hi, If anyone (preferrably in the UK) has the LF version of the SDR4+ they wish to sell would they please contact me direct? Even better, if there's any chance of one direct from CCW please let me

Hi Chris! Thank you :-) I answered…

Hi Fabien, PM sent. Regards, Chris

Good morning from France! I bought a second hand loop amplifier v4. Everything was ok until I test it with 12V. Worked a minute then no more reception. Any ideas? Q1 transistor on the bias-tee

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

Not necessarily, it depends upon what the certification mark indicates it as being. Regards, Martin

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

“but I'm missing why some power supplies have negative output and mains earth connected inside the supply” Hi - afaik - if the appliance has an external conductive part (ie a battery charger in

It's simply a design choice, depending upon what it's intended to power, and how it's designated in terms of electrical safety regulations. For example double insulated power supplies generally have

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

Hi Roger, An 80 cm diameter hula hoop is ideal for a simple loop but it's probably a bit small for a cardioid loop. The cardioid loop has a terminating resistor that reduces the efficiency of the loop

Very interested in constructing the loop. Have had difficulty in obtaining the plastic loop locally but thanks to my granddaughter I have obtained a sturdy loop BUT it is only 80cms in

Hi All, Station earthing is endlessly debated but it is a serious issue, and If you have an outside antenna, it's one thing that you really can't skimp on Beware as regulations vary around the world

This concern comes up at repeater sites, a lot of people disconnect the mains grounding wire inside the rack mounted Astron power supplies as the power supply is metal and is secured to the metal