continued ... The black trace gives it away. If there is extended QRM that spans the noise measurement period (which is the WHOLE minute before) and the 5s Tx period it will show up on both. T
The effect of AGC is even worse than amplitude modulation, it can add a non linear element to the signal processing. The amplitude of the receiver output is proportional to the input power multiplied
Easily, all you need is a five second transmission of carrier at xx:05:25 xx:20:25 etc But accurate timing to at least one second accuracy is essential, so the PC clock will have to be set continuous
Hi Graham - I'm not bothered about log files myself as I don't have the time to collate massses of data but if someone else feels they'd like to do it... Haven't hought about how long it will go f
I'll run my WSPR beacon again tonight on 503.870kHz (USB Dial 502.4kHz, tone 1470Hz) unless there are any big Eu / US stations going to be operational elsewhere in the band. Andy G4JNT www.g4jnt.com
Mine is still running. Every 15 minute interval at 4, 19, 34, 49 past the hour. CW + power steps + carrier + PSK31 + carrier for one minute. 503.700kHz Andy G4JNT www.g4jnt.com 2009/3/31 dave
Don't destroy your noise figure though. But at HF you can probably get away with 20 dB at least. Andy G4JNT www.g4jnt.com 2009/3/16 Gary - G4WGT <[email protected]> Andy, OK, I will insert an a
I've got another monitoring prog that works on similar signal detection principles but a bit more rigorously and was designed for monitoring a continuous signal such as beacons. That S/W is a bit
There is not really any such thing as a hit with this "monitoring software" - it is not a logger as such, just an estimate of the frequency of a peak stable in a narrow bandwidth when measured over t
By installing a second copy of GB3RAL in another directory (folder) it is possible to run both instances at once from the same soundcard. Offsetting the timing differently on each allows six time s
Thanks to John G3WKL and to Rod Wilkinson of OFCOM, I now have Official Sanction to run the 'Multi Function' beacon (Well, can you think of a better name for it !) beacon on 503.7kHz in continuous
BIg signal showed up at http://myweb.tiscali.co.uk/wgtaylor/grabber3.html Big one-off peak in the blue slot, then it moved into the green one. Wot's going on ;-) Andy G4JNT www.g4jnt.com 2009/4
You've had several replies! Surely you should be looking at more than 100km for daylight range, Richard. See if you can hear my beacon on 503.7kHz, transmitting every 15 minutes at 04/19/34 and
There's my I/Q design for souncards and narrow band phase shifter as published in April's Radcom (Data Column) and at www.g4jnt.com/LFUpconv.pdf Andy G4JNT wobbleU cubed .g4jnt.kom 2009/5/18 Ric
Ansoft Designer came up with this solution. http://www.g4jnt.com/518kHz_BandStop.gif The component values aren't particulalrly nice, and there is almost certainly a nicer design with transformer
G3GNR is not far from Dartmoor - a well known microwavge operator, as is G8BKE. They're all moving to MF! Andy G4JNT wobbleU cubed .g4jnt.kom 2009/5/10 dave <[email protected]> Richard, A
Answers to all comments. It was modelled with lossless components. I didn't have to time to do any mofre than a basic cesign.. But its a relativlely benign filter so inductors with Qu of 40 plus
A full quarter wave inverted L with sloping end is starting to become a loop with the ground path forming part of the loop conductor, rather than a vertical. ANY antenna that approaches more than a
