Conrad.. I’m just about to test an ASUS PN40 with 256GB SSD and 8GB of DDR4 RAM The PN40 was £97, SSD £27 and £32 for the RAM; Windows 10 x64 Pro FOC Not a great spec but how will it perform with my S

That brings back memories of the early 60s when we were operating G3OUL in the Students Union at Liverpool University. We kept breaking through into the Tannoy system. It turned out to be diode-like c

I suspect you're right about a ground loop Jim If your motor uses a ground wire some motor current will leak into other ground connections. Ideally use completely separate isolated plus and minus powe

Thanks Sigi That works perfectly. Now all I need is a downconverter for transmit. Really fine software. 73 Allan G3PIY From: main@SDR-Radio.groups.io [mailto:main@SDR-Radio.groups.io] On Behalf Of Sie

I had some spare cash from volunteering for a Covid study so cashed a couple of e-cheques and bought an upconverter (Ham-it-Up) which arrived today. Buying the board and case separately you save £8 wh

Hi Jon and Jean Marc Worth mentioning the Andrus SDR, now rather dated but fitted with an Ethernet port and is therefore my only SDR that gets no interference from my computer and is located close to

Any chance of adding aerial selection to the Andrus if you have a few minutes Simon? I’d like to be able to select one of two aerials. There are possibly a few users out here in the ether… 73 Allan G3

With modern graphics cards with say VGA + HDMI and the latest DVI socket you can run 3 monitors displaying different pictures. Years ago you needed one card per monitor unless the card was described f

That’s more or less what I expected. The SDR meter provides a jolly useful measure of change and not anything absolute. I began to get interested in this topic when discussing the Tiny 2.8 Spectrum An

Not really Allan G3PIY

Hi Willi I tried lots of settings, visual gain and receiver gain, bandwidth etc but the meter consistently read 6dB or more too high compared with the trace.. I then set the receiver to 500KHz scan wi

That does seem to make sense Willi. If I measure the noise source with a wideband power meter it tells me it is 0dBm so the noise within the selected bandwidth of the SDR at 190KHz is summed over the

I notice my SDR-Play when fed with a home brew noise source gives signal strength readings that do not match the display. Generally the meter indicates some 6 to 10dBm higher than the display. This al

Before you place your bets, there are a few clues here.. the words New, Research and Predicts. Much the same as Modelling …or Modeling depending on where you live, Guesswork and Stochastic and worst o

A few comments to all that responded. There are not many varicap diodes with enough swing to tune the VLF band. Using two back-to-back 1SV149 diodes would give me only 250pF so I’d need 8 to arrive at

Interesting, but do the advantages outweigh the disadvantages? The fact that you’re tuning a specific signal with a significant degree of selectivity means that you’re unlikely to notice the effects o

Hi Paul Try a varicap and a ferrite rod. A lot easier to handle and you do not need a ladder to adjust it when on top of a pole. http://www.radiomuseum.co.uk/active.html Allan G3PIY From: main@SDR-Rad

Ah Southern Germany… memories of Oktoberfest Marco. Here’s a similar range of frequencies South Coast of England on my random wire not my tuneable ferrite rod aerial as before. I had to wait until a l

Thanks for the information Marco. Maybe you can verify the signals on the attached picture (not 20m but nearer 20KHz)? I think one is JXN on 16.4KHz, but the others are possibly solar panel radiation

I spotted this just under 40m. It sounds like a jammer with those vertical lines measuring 80Hz apart and covering a little under 1.5KHz bandwidth so presumably aimed at one specific broadcast? Maybe