The self contained TV reference I mentioned yesterday appeared originally, by DK2DB in a German publication and was translated by G7LEE for the RSGB Microwave Newsletter January 1996. According to th
Wherever did you find them at that price ? Mine cost nearly 100 pounds, and that was from the TAPR special deal on GPS25s. Not all handhelds have a 1pps output - before getting the GPS25 I searched t
Yes, there is a published design for a TV frequency standard, need to search for it at home before saying where !. There was a German article published several years ago for a 10MHz frequency standar
Can you get German satellite TV over there ? If so, my understanding is that in D land TV sync is used to disseminate the official time and frequency standard, and this extends to the ZDF satellite t
Consider the (alleged) negative altitude and rather wet destination of many transmissions at low frequencies and the effort+encryption put into sending these. They don't need to use ancient stop star
If you can manage it, how about BPSK reception on 1000MS (1 bit / second) with suitable frequency stability. I reckon this, possibly with Grab enabled as well, may allow reception of those with less
If the error correction circuitry only trys for a best guess this will always be the result - random noise in, random characters out. If the error checking routine measures the amount of error, for e
John - I've just looked at the spreadshet I sent you. Don't take too much notice of the figures in it - I was playing about with Litz wire loops obviously at the time that was saved. A Qu of 10000 ce
Try to get hold of a copy of the original Mk1 LF Source Book - I covered transmitting loops in there in some detail - before realising they are not the way to go on LF ! Unless you can erect a loop w
--Hi. I am nearing the end of writing my column in the local amateur radio journal and I am a bit thin on frequency stability guidelines for working QRSS and BPSK on LF. Nobody in ZL has yet got goin
I don't know those particular mods, but my IC746 was supplied (quite intentionally) with all band transmit capability. However, the transmitter is still inhibited when trying to operate below 1.5MHz
Oh -- that explains a lot -- Particularly, why, during testing yesterday of SMT Hell bandwidths and pixel durations, the optimum settings for decoding with Argo seemed to come out with ratios that di
We also use the term "Meetings Engineers" for those who spend their time in conferences and talking rather than getting things done. 'JNT First I have to correct my spelling. It's View Graph, which i
From G3XDV I contend that, although I may have my theory incorrect, using elevated inductance can be worthwhile (even with the increased resistive losses caused by the total inductance having to incr
Not strictly true..... Some data modes invented by amateurs with characteristics that were designed solely for use in crowded bands have found their way into commercial and military useage. But you'l
Remember to terminate the IF low freqeuncy port and a least one of the others with something close to 50 ohms at BOTH wanted and image frequencies if you want to preserve the full dynamic range and s
I think it rather sad and a sorry state of affairs for amateur radio that there are people out there who may not be interested in the technical side and presumably just want to be appliance operators
Mike's comments still seem to make the assumption that a human brain can do better than software. Why ? It doesn't matter how good your eyes are at perceiving subtle differences of tone or colour int
Has anyone looked at what Signal to Noise is realistically viewable on a spectrogram display ? Assuming bandwidth equal to FFT bin size, my few tests suggest around 10dB but it would be nice to have
That may not work too well, if the openings are 'only' a few hours long. The channel bandwidth is being spread to 1/(few hours) Hz and going slower will not help. Nice to try though. Better coding wi
