John, Wish we did have access, though; 15625 being 1MHz divided by 64 is a beautiful thing! In the American system, our sync-to-standard-frequency ratios are a little messier. The color burst frequen
Alberto, for In Italy, the state-owned TV broadcaster RAI has all its timings locked to a central Caesium standard, in Rome. Or at least so I have been told by a former RAI employee. I'm wondering if
John, << I am also having a sniff at locking to off-air TV which has Rubidium accuracy in the pulse TIMING. >> Are you able to verify the use of a rubidium source there? Hardly any TV stations here u
Andy, Thanks for the comments on frequency stability. Much appreciated. My personal situation is that I am arranging for my TS-850 (built with a 4 channel DDS lineup) to have a better timebase than c
Andy, 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
James MB0BMU and others I agree with your comments that impedance bridges are up against it for directly measuring electrically short antennas, and that prior resonating with a loading coil (and corr
Dick PA0SE, Thanks for the information on your shack being in the attic. Down this way there are very few houses that are more than single storey, so my "suggestions" did not suit your QTH environmen
Dick PA0SE, Regarding your observed losses being higher in damp conditions: It amazes me that the resistance is lower in summer than in winter. I had expected the opposite. There are no trees near th
Jim M0BMU, Some further comments on selected points: I am confident that there was a slight increase in FS, and that it was near 0.9dB A decrease in current from 2.7 to 2.2A would result in FS decrea
Mike, I am happy to clarify various points: Can you explain this concept, please. It is foreign to me. It could be a term from MF broadcast antenna practice, and it means adding together all the seri
Hi all, I too support the idea of having a reflector site with the principle objective of discussing "high tech" modes for LF. It is not that I do not support other facets of amateur activity, but I
Mike and others, OK on the elevated loading coil. I'm not convinced that hard results support your claims: Yesterday, I reported that I had increased my mast-head inductance so that the antennna was
Johan SM6LKM, What dot length is Larry using? Larry advised me to use 60 second dot setting. I'll be trying with Argo to look for Larry when he is next transmitting. 73, Bob ZL2CA
Why not use the signal from one of the LF time clocks, and correct by offsetting the distance. That assumes there is available coverage from a terrestrial transmitter with time information. GPS is g
readers. I agree entirely that 100% accuracy should always be the aim, and I believe that RadCom and QST both have a high hit rate, but the point I was making was that a story with some errors in it
Mike, It has been pointed out, quite correctly, that the ARRL story about LF operating has errors in it. In defense of my fellow journalists, I will say that given limited resources it is inevitable
I need a help: I have an SWR bridge - 2 X 1:40 transformers on a conventional circuit and from this bridge I have two rectified voltages: forward and reflected. On the other side, if I have any reac
Mal, I think you are getting stuffed up between real-time modes and non-real-time modes. Contacts can be made in non-real-time modes, just like on this reflector site. I'm interested in LF DX communi
Hi all, While PLL systems are in service for systems having quite good signal to noise ratio (such as telephone modems) it is quite another thing to try and decode the wanted signal when it is a nois
Rik and other readers, For those who want to calibrate the soundcard there is also a simple hardware solution : Take a CMOS4060 (14-stage divider with internal oscillator) and let it run with a xtal
