Jim , Great !!!!!!! I didn't think anyone would actually build one ! Now you need a way to do the arctan function in hardware. Or, thinking laterally, a servo loop off the Q channel driving a phase s
I made three complete transmissions of the sequence "G4JNT PSK CW " and most of a forth one until 2022z This sequence had 124 dot intervals, including end of text spaces, so repeated every 20.67 minu
The 137450 signa was me - soak testing the transmitter after a minor mod - did you miss the 1Meg WPM CW ID :-) Andy Hi All, I am recieving two strong carriers today, on 137.450 S9+20db, and 137.745 S
Does ZDF still make use of TV sync to distribute standard time and frequency in Germany ? This signal received from Astra could be relied on as being highly accurate when this was the case and severa
Thought it felt a bit dubious, but I hadn't got the core loss information available so couldn't justify the feeling. Anyway, isn't 2 mix - the red coloured one - the wrong material for this frequency
Re Tank coil components in LF Transmitters: Use the equation V = 4.44 . F.N.A.B to determine the number of turns needed on a ferrite or iron dust core. The T200 core Mal mentioned, if it is the norma
I've had one or two of these recently, often from unknown sources. I have always assumed it was caused by an incorrect HTML conversion setting, and deleted them without thinking any more. If the mesa
If WWVB is 2800km from us, then the signal takes 9ms to get here. Assuming the shape of the pulses is the same as for MSF ie a carrier break for 100 - 300ms timed to start exactly at the UTC second ,
Certainly hope not ! Putting a windows interface around anything usually damages it. Andy G4JNT Is WOLF going to operate as a Windows program this year??? http://www.we0h.us/lf.html What hapenned to
OK then, so we need a waveform that is immune to high level broadband spikes. Narrow filtering will remove the spike energy, but in turn will spread it out over the period of the filter response so w
is over 100 km away, so it does not cause the same trouble you might have in areas such as the U.K. but helps to fill the band at least with some signals .... ;-) But scaled down Amtor (divide by 10
For a bit more programming practice, allow the user to enter the units as part of the values. eg. type '10u' and '100p' instead of just numbers. Hint, use the INSTR...ANY and MID$ functions in Basic
Isn't AMTOR / RTTY a rather wide and dirty mode to be using on LF ? 170 Hz shift transmitting 100 Baud is at least 300 Hz wide......... Andy G4JNT version of MixW2. Olaf on the other side used a G3PL
According to this month's RadCom there is to be an LF Roundtable at Crawley on July 21 and readers are referred to the CARC Website www.carc.org.uk for details. I couldn't find anything there, or was
That should, of course, have read every two months !!!!!!!1 An excellent technical magazine, the "Forum for Communications Experimenters", produced every six months by ARRL. See WWW.ARRL.ORG for more
An excellent technical magazine, the "Forum for Communications Experimenters", produced every six months by ARRL. See WWW.ARRL.ORG for more details. Andy What's 'QEX' Andy? Full details of this Tx wi
For my 700 Watt transmitter I use an ETD49 core (approx 200mm^2 core area) of 3C85 material as the output transformer. This matches the 28 ohms output impedance from 12 turns on the primary, to a ran
These Piezo modules work OK off a 12 Volt supply. The heater takes several tens of minutes to reach operating temperature (can be even up to an hour in cold weather) but it gets there eventually. The
