I've been plagued for some years now by a "water softener" that puts up drifting jaggies every few kHz all the way up the HF spectrum to at least 30 MHz. The only redeeming factor is that they drift
Sorry to be the bearer of bad news but John Rabson sent me the flg today from BT house magazine : BEACON AIDS SAFETY AT SEA BT is playing a key role in an initiative to deploy a navigational safety b
We have 136 only on a "non-interference" basis so complaints of QRM from Loran would get us absolutely nowhere. Bit more information - it's only there until BT finally closes the site totally in 2007
Stewart, Re : Loran Blankers : It is not too difficult to build a blanker for Loran. I made one in the early days of the 136khz band to try it in comparison with antenna nulling techniques and it di
The coilhouse for the Decca coils used wooden platforms and the spec was mahogany, kiln-dried for (I think) a month, then coated with water-repellent gunge. One day a new set were put in and when the
It's a bit late for Christmas puzzles but try this one: Circuit A is the usual antenna tuning cct for a short highly reactive whip. It has the advantage that the antenna tuning inductor can be a long
Laurie, I've been using an LF preselector with an EF37 amp for some years - otherwise known as the R107 LF unit! I did a little article for RADCOM sometime in 1964 about the theory of those 807 distr
In 1968 I had a long-running correspondence with the RSGB over the IARU adoption of what was then the "QRA Locator"; later to become the "Maidenhead" locator. QRA was first proposed for amateur use b
That is an interesting historical account but you fail to tell us the reasons advanced for not using Lat. Long. ie trigonometrical definitions on a true curved surface rather than draughtsman drawn s
The definitive lat/lon to NGR and back converter for the UK is on this site : www.gps.gov.uk It's free and on-line. You can also get a stand-alone converter file free but you need to log on as a user
Roger, As long as it's you that has the soft spot and not the 807's! Walter G3JKV. I still have a few 807s from the mid 1940s, They were a grreat boon at the time and I have a very soft spot for them
The performance of a modern rx with a good infinitely-variable DSP filter at very narrow bandwidths is better than older rxs because they don't ring at the edges as xtal-based filters do. I had an Ic
For some months I've been hearing what sounds at first like very slow Morse on 137.203. It's there 24/7 but it isn't Morse, it's just random long and short dashes. Looks like this on Spectran ("800"
Markus, Yes, saw it myself this time. It only added about 4 dB amplitude in a 10 kHz bw and I couldn't see much difference in sidebands at 137 kHz. Rugby and Lessay are very roughly the same distance
