My aerial temporarily lost half the wire so signals are generally weaker now but I noticed two similar signals to the one at 16KHz. These are roughly centred around 8.37KHz and 10.6KHz and have crysta

I looked at JXN Martin from your Cornwall receiver but no sign of my 16KHz signal, just JXN. Here is my mystery signal very much stronger and now sitting at S9 and I wonder if this example is fairly l

A customer supplied an unopened Windows 10 Home DVD on Friday asking me to update his laptop from a Windows 7 x32. Everything went normally, but at no time did I scrape away the grey material masking

I lowered the Ventian blind just in case Kriss. Oddly I was at GCHQ just 50 years ago in January 1970. The site is now a Sainsbury supermarket. JXN is present all the time, but the wide signal just be

I checked at 11pm and the signal was present at 16.4KHz. The wide signal around 16.1KHz was off more than on around 5pm. I wonder if it is operating only during the working day? Benefits of having sev

I raised my wire antenna with the aid of a home made bow and arrow and some trees so its now 50 feet high and about 500 feet long. Apart from various noisy power supplies I can see quite a few real si

My Win 7 x64 does the same Simon. The audio continues but the program isn't shown in Task Manager applications. The Wait box changes to a crash dump window after a few minutes and closing this kills t

An SDR is pretty good as a substitute spectrum analyser for making filters. Allan G3PIY

If you get 30 to 40dB skirts from a tuneable bandpass filter wouldn't that do the job re 100W versus 120KW? You may need a 3-gang tuning 500pF capacitor and a set of carefully matched coils. Allan G3P

Back in the 1920s and 30s a common problem was reception of weak signals in the presence of strong local broadcasts (not that I remember.. I just read about it). The answer was to design a proper RF f

My SDR is brought back from the dead. I was using a scalpel on a circuit board from a label printer earlier today but alas I’m not licensed to do actual brains. I’ll ask around if it is not too urgent

You are right Simon. I updated Vipre and it turned a firewall on in place of the Windows firewall. I was just about to unscrew the lid and start brain surgery on the circuit board Many thanks Allan Fr

Here it is Simon It’s like going to the dentist L Allan G3PIY From: main@SDR-Radio.groups.io [mailto:main@SDR-Radio.groups.io] On Behalf Of Simon Brown Sent: 29 January 2020 16:31 To: main@...

One day everything was OK but the next day I could see no activity from my SDR which is an Andrus Mk1.5 I can ping its address 192.168.0.87 and it responds.. but it seems dead. Screen shot attached. M

Snap… I use my Andrus over my LAN to an Atom 230 with the latest Windows 10 and Simon’s SDR Console into a 40 inch TV. No problems, but the SDR runs only 400KHz bandwidth. I was a bit surprised when W

The Andrus SDR Mk1.5 has two antenna sockets and it would be useful to be able to select the second Simon; in the same way one can select Lime inputs, and perhaps couple this feature to the stations s

I might try a 49:1 unun Vince. I carried out tests on my smaller 9-turn home brew 9:1 unun and its response was virtually dead flat from 10KHz to 100MHz. Allan From: main@SDR-Radio.groups.io [mailto:m

Scroll down this page and you can see my Moonraker discone here. I scanned it some time ago and it did appear to work down to well below the specified 25MHz although I only checked it down to 1MHz, bu

Thanks for the explanation Gert. I had an idea to test the UNUNs to see how they perform on the bench. The plan is to feed each with a tracking generator, perhaps via a resistor roughly equivalent to

Hi Kriss That version is the same as mine but I read that they are best at HF. Have you seen details for an LF or MF version? Because I use it for receive not transmit I wonder if I can use say three