Forwarded from Rik Strobbe: A software team from the Belgien amateur radio society UBA has developed a programme that can be used to register the fieldstrength measurements. All you need is a PC with
For some time I have been thinking of setting up a remote receiver in a quite location linked back to a more conveniently located transmitter location. This would be an interesting extension. There
There's a lot of discussion going on at the moment on the US "LowFER" mailing list about the relative merits of slow CW versus BPSK I think it is appropriate time to remind that some countries have
Hello all Yesterday I spent a while with shrinking WAV's in SoundForge and CoolEdit. In the original file (da0lf), there is nothing heard by ear, but when the file is open in the Gram, the signal tr
1) Take the off air signal recording at (say) 8000 Hz sampling rate 2) Digitally mix down to some arbitrarily low frequency 3) Filter to the necessary sub-Hz bandwidth centred on the signal 4) Decim
Why do the manufacturers still bother with S units. Why don't receivers just measure dBuV or dBm at the antenna? While it certainly would be nice to have a dependable dB scale on the meter, I do not
Is it a coincidence I wonder, that the 'standard' Soundcard / CD sampling rate is a multiple of the squares of the small prime numbers. ie: 44100 = 2 * 2 * 3 * 3 * 5 * 5 * 7 * 7 Spooky ! Certainly s
This needs to be carefully thought through - I for one am reluctant to bring up issues about 300 second data bits simply because I know that many of the participants on this reflector are not even h
Hi group, is there more you can do with that CW carrier-component than simply detect the presence of a signal without being able to decode it? Well, we could use it to guide a large adaptive array t
Sorry, I confused you all and remembered the wrong device. The valves are E55L Pentodes. (E88CC is a doube triode, sort of ECC88 then they ran out of numbers! ) I don't think running out of numbers
Hello Laurie, In most circumstances SNR will be determined by the 'band noise' (QRM - QRN), so the noise figure of a pre-amp won't matter too much (anything below 10dB should be fine). But, unless y
I found an interesting tutorial article about undersampling and ADC parameters at http://archives.e-insite.net/archives/ednmag/reg/1995/080395/16df1.htm Since the article is from 1995, the list of av
your thoughts about an undersampling LF receiver are very interesting! The "tunable crystal filter" solves the problem with multiple alias passbands associated with undersampling but there are other
The BFO at 456kHz is derived by extracting the 57th harmonic of the 10MHz divided down to 8kHz. This was actually extremely simple and the most satisfying part of the breadboarding process to get goi
Hi Alberto, we are all jumping on you for your over-enthusiasm........but it occurs to me that this is a 24bit card....than may be more significant. It has the potential to give the level of s/n we
I use my IC706 as signal source for the 180 KHz transmitter, dividing by 100 from the 18 Mhz band - and it works like a charm {our ZL band is 165-190 kHz}. At some stage I believe that our allocatio
