Hi John, I can receive with good sensitivity down to 30 KHz. What European commercial could I try for and what is their transmission format? When we were at the recent LF mini-convention at Flight Re
Wolf, DL4YHF, said: ".......the system does receive below 10kHz but I don't know how good. I don't have a commercial receiver which goes below 10kHz, so I cannot compare my RX system to a professiona
FWIW, we had most problems with Decca skywave interference at sunspot minimum. There is this thing called LUF (Lowest Usable Frequency). Not much in ham literature about it but from Bill Orr's Radio
I shall make a big effort to be there. 73s Laurie. I expect to be going. Laurie, if you are going could I come along with you? My Tel 01903 770804 or e-mail I will be bringing the Frank Gentges acti
"Radio Engineer's Handbook" by Terman (1943): http://home5.swipnet.se/~w-54761/terman1.jpg http://home5.swipnet.se/~w-54761/terman2.jpg There seems to be a close correlation between sunspot numbers a
A long thin wire tied to a cluster of helium filled Durex units will dramatically increase the effective height of the transmitting antenna! I didn't find these type of balloons very successful and
Hi John, I am updating the Cave Radio & Electronics Group website at http://www.bcra.org.uk/creg/ and would like to include a link to a site which deals with conventional (!) LF amateur radio. May I
When not in the shack I leave the aerial floating in the hope that it will be charged to the voltage potential of its surrounding so that lightning won't "see" it. Or is that a misconception? In a d
Thanks Ko for the report.glad you saw us. Yes, Ko's report was very useful. From his field strength readings we should be able to make some good estimates of relative transmitted power. Laurie and I
Hi Laurie, and any 73kHz watchers. Laurie said I think things are against us but its worth a try,and I want to see if the fuses will hold >out. The TX runs more power on 71.9 so gets hotter,but the r
I have dusted the cobwebs off my old BK amplifier and am transmitting on 71.85kHz QRSS 20 sec dots Relatively low power at 200W. Regards, Peter, G3LDO Web <http://web.ukonline.co.uk/g3ldo>
Hi Ian Your e-mail regarding the CFA antenna got through the reflector OK. Maybe a bit "old hat" - no pun intended - but I see GM3HAT has a bit on the CFA in the July issue of RSARS mag, "Mercury".(
It seems a long time since I wrote to this reflector. I have been reading the mail but have been rather busy. I have just sent off all the chapter of a new book on Mobile radio. This turned out to be
Some time ago I obtained a Decca loading coil on one of my visits to the Crawley radio club. The Decca coil on page 64 of the LF Handbook illustrates the general construction of one of these coils an
Hi Rik L = inductance (nH) N = windings D = average coil diameter (cm) H = coil length (cm) C = thickness of the wirelayers (all together, in cm) K = correction factor depending on H/C ratio : L/C K
I am dismantling a Decca loading coil with the objective of rebuilding it to load my 16m high antenna. It will be converted so that it is a multi-layer coil. Does anyone know of a formula for multila
There is a silent majority about that knows exactly what is going on and one of these days the bubble could >burst, when the majority point out to the RA what is really happening, and it is certainly
Hi Bob I noticed in RF DESIGN a note on 'antenna coils' designed for RFID applications at 125 kHz, and made of ferrite laminated on to a ceramic base, with values to 8.1 mH. They are very small, 12 x
Nice signal received at 1400UTC (went off at 1408) on 137.704kHz, using 3 second dots and sending DJ1FK. sorry - sending DJ1YFK Regards, Peter, G3LDO Web <http://web.ukonline.co.uk/g3ldo>
Hi Fabian, I will again make a qrss-test transmission today. the transission on wednesday was not heard by anyone, but I think I have found the reason.. there was a little arcing at the antenna-isula
