In anticipation of it appearing on this reflector, there is a hoax virus alert doing the rounds. If anyone gets a message saying the file in the windows system directory called JDBGMGR.EXE is a virus
Recently someone asked for any details about the Plessey Figaro radio as used by fire brigades etc. for communications within buildings. I have been supplied with a copy of the brocure on it by G3YGF
Sorry if this is somewhat off topic, but I am looking for the design equations for spiral inductors printed on PCB material, with or without a groundplane. I vaguely remember seeing some equations in
You have a small box whose internal workings you can't see, but the box has two terminals. You measure these two terminals with a voltmeter, and it measures precisely 1V. You short the two terminals
This simple puzzle caused more discussion in my office this morning than it had any right to. Have a ponder while waiting for next QRSS symbol to come through. Andy G4JNT -- From Circuit Cellar magaz
Did anyone take part in the ARRL Frequency Measurement tests early this morning ? The 3.5 and 7 MHz transmissions were clearly audible at my QTH, but unfortunately not the 14MHz or 21MHz ones. Manage
Rik - You may have a virus. This message was sent to my work account, which does not get LF reflector messages. The firewall detected and removed the attachment. Andy G4JNT --Original Message-- From:
We thrashed out this solution on Friday afternoon, it explains why the maths appears to fail but the concept doesn't. Judging by relies on Friday evening and Saturday, several readers of the reflecte
I wonder if some of the LFers work on the efficiencies of small antennas might qualify. Andy G4JNT Do you know someone who has carried out novel or outstanding work in the field of electrical or elec
Sorry all - its farcical I did just the same thing! Andy 'JNT Sorry, group. I meant to send my request directly to Andy. John "This e-mail is intended for the recipient only. If you are not the inten
Re your original pst to the group - Glad its of some use, yes print in the Lowdown with pleasure. I can let you have the original source material if its any easier than taking it from Alberto's page
1) Since transferring this reflector to my works computer and cancelling the old home EMail address most spam has stopped. However, I now get the occasional one to work which gets through the firewal
Well... If you really want to play on the cheap and your ETrax has no PPS output, I suppose it is remotely feasible the leading edge of the NMEA string is probably consistent from second to second to
Well, I was really thinking of GPS locked PSK rather than any incoherent mode. WIthout the need for clock and frame timing recovery we could scrape every possible advantage for coherent signalling. W
Judging by the lack of replies to this thread - there seems little interest here. A very great pity, as accurate GPS locked timing is the next great improvement we could make to LF signalling. I have
What is the output configuration from the Iout pin(s), 20/21, on the AD9850 to any anti alias filter? Secondly, what is the value of the Rset resistor on pin 12 - this sets the full scale current fro
Usually these radio controlled clocks only check the time every few hours or when they are turned on. Normally the 1 pulse per second is just derived from the internal oscillator and I would expectyo
After some detailed measuremetns on eight GPS receivers from different manufacturers, I've found that the modern ones mostly exhibit around 100ns jitter from second to second. Older units like the Ga
Both stations would have been using locked sources - to GPS I presume - so getting the few Hz accuracy wouldn't have been any problem. "Up there", the issue becomes more one of getting the phase nois
Think you're right. On my other non-firewall protected machine it tried to keep downloading even after I disconnected. Only stopped once I'd gone through task manager. File deleted untouched. I got a
