After a bit of 'codebreaking' to identify the character boundaries I managed to get perfect copy of Brian's 1 Bit per Second GPS locked PSK transmission. Starting at the two minute marker the text re
It is CT1DRP sending 1 B/S BPSK. See my other posting Andy G4JNT Hi all: Does anybody else receive a continuos and strange signal on 135923,6 Hz. 73 de José, EA1PX
Hear Hear Andy G4JNT Worked VE3ZJ last nite but this time on 7 mhz CW in the BERU contest. He was a big signal. It looks like most of the LF ops have moved HF. I have worked quite a number of ex LF o
Looks interesting. Can you generate a .WAV file next time you hear it - then we can try analysing it. Andy G4JNT << File: ATT00000.txt; charset = Windows-1252 >>
I hope his claims are backed up by serious properly calibrated range measurements - not just an "I worked Chile on 14MHz so it must be good" (or Scotland on 80m etc) Andy G4JNT Another link is : http
Can anyone who has programmed this module from first principles help?? I'm trying to write some code to communicate with the Connexant Jupiter T GPS module, as used in the simple GPS Disciplined Osci
The new one (...i2phd.com) is quicker. Andy G4JNT Could you please all of you do me a favour ? As you may know, my Web site http://www.weaksignals.com is physically hosted by qsl.net, which more ofte
Does anyone have to instructions for using the "Tin Plating Crystals" as sold by RS in the past. Their stock number is 567-812. The only writing on the jar keeps saying how dangerous it is, how it wi
Ok Thanks Alan. I'll make up a solution in that proportion and give it a try. Being able to tin plate home made PCBs may solve the not too major problem of them becoming oxidised and not so nice to l
Having now made up two DDS boards that worked first time, the kit is ready to go... Andy G4JNT. AD9852 Direct Digital Synthesiser Module This DDS unit is capable of being clocked at up to 300M Sample
I view of the continuing arguments about this issue, is there anyone who knows, or knows someone, with the mathmatical understanding of antenna theory as well as the common sense, to come up with a p
Well... That may not always be the case. If experimentation disagrees with theory you need to check that everything is accounted for, before assuming the theory is wrong and reworking it. It is too e
Do you have any interest in pics of the 700 Watt Switch mode Tx I published in QEX a couple of years ago? Andy G4JNT I have asked a few questions recently on the reflector and have received some good
I've received nothing from either the LF or Microwave reflectors in the last 18 hours. Are things working ? Or has everyone given up radio in the hot weather? Andy G4JNT
I have used to SRA-8 in an LF receiver and found no problems whatsoever with signal handling. It is a standard level 7 mixer, (optimised for 7dBm Lo drive) so will have a 3rd order output intercept a
For a dot lasting an hour, followed by a space lasting an hour and then repeated, the total power is 50 Watts, with 25W in the carrier, and the rest in the entire set of sidebands stretching out to i
Its not just young electronics engineers who know nothing about inductors. I work with a number of middle aged ones (well, 30 - 50 anyway) who also know next to nothing about inductors, wire antennas
When it comes to calculations, the most useful ability is not to be able to caculate it exactly, caculator or no, but to quickly be able to estimate a ball park answer or approximation. Who needs to
I used to use a variation of an early version of it on 73kHz. Wasn't very efficient on 137kHz while keeping good linearity for PSK31 and similar, so I built the 700W Switch Mode instead of trying to
Has anyone got anywhere with developing soundcard based MSK ? Surely that is the next obvious move on LF where switch mode PAs rule and a linear PA isn't a realistic option for high powers, knocking
