I have a new 'breadboard' programme running now that shows a real time waterfall and spectrum display. It is excrutiatingly painful to watch as the display is only updated every 18 minutes !! A defin
After finishing tonight's test with a carrier from Marco, I'd like to try some other signals from Eu land. What strong signals with a definite carrier component are out there to monitor. . Does not m
There has been a strong carrier on 137.7446 kHz for at least a week. No modulation and strength doesn't seem to vary. Can anyone else hear this ? If not and it turns out to be local interference, I'l
The IK1ODO beacon was much stronger last night (Saturday) when it appeared at around 2000z than it was the day before at the same time. Averaging at least 20dB above noise in 0.03 Hz bandwidth unitl
Unfortunately Magellan appear to be the odd ones out on GPS receivers. I have a Magellan Trailblazer, circa 1993-4 which is almost certainly similar to yours, and there is no trace of a 1 PPS signal
My problem with Morse (I did use it once upon a time) is getting the words down onto paper these days. After 15 years of using word processors for everything, I've forgotton how to hand write fast en
A really good headband binocular magifier helps. Such devices are available from RS ref no. 606-989 at x2.7 magnification (£52 ish) with alternative lenses for x1.8 to x3.5. Somewhat cheaper is 290-1
I have the Magellan Trailblazer, oldish GPS handheld circa 1994. There are no 1s pulses anywhere to be found on it, and the unit only displays NGR, Lat/Long or UTM. Look at the TAPR website for their
One PPS output on the Garmin GPS25 is specified at 1us accuracy. This ought to be adequate if the PLL has a long enough time constant. I use mine to drive the B input of a counter timer and using teh
In that case, use vertical scrolling and turn your head sideways, that gives the proper mirror image doesn't it ? I'm not turning it upside down ! Andy Hi all the only trouble is that a lot of us use
Peter has asked me for a write up for the LF Book, so full details will appear there. But basically it was a bit of fun to show how something can be done with a DDS in real time other than just using
The signal is now running using a 5 Hz bandwidth on 137.6kHz. Change Spectran settings to 0.06 Hz resolution and adjust the speed control for best looking copy. Be patient.... Each pixel is timed for
Tomorrow, I may run much lower power on 5Hz or 2.5Hz span. So if the signal appears much weaker than today's it will be because I'm using a 10 Watt amplifier module instead of the usual 250W job (thr
For information, I am transmitting a 2.5 Hz wide SMT Hell signal continuously on 137.6kHz with pixel duration 2s. Use Spectran at 0.031 Hz resolution and about 40 - 50% speed, averaging off. Power ou
