Hi Jim, I also saw SM6LKM's 80m signals, about 5-6 Hz above the nominal frequency, thanks for the report! the lines were quite fuzzy, whether due to propagation or TX I don't know. The TX is not fuzz
Walter, Interesting! Is that RADIATED power or DC input? It is output power. The beacon TX feeds 1mW into the coax. The output voltage from the signal generator is 1Vp-p and there is a -4dB attenuato
There is likely to be several Hz of Doppler shift on that frequency at night time. Right. It is interesting to look at the carriers from various broadcasting powerhouses on HF. Sometimes they spread
Mike, Is QRSS10 a way of saying QRSS with 10s dots? Yes. It is not my idea. I got it from the Lowfer mail reflector a week or two ago. I think Les Rayburn, N1LF, "invented" it but I am not sure. (I l
The beacon went off the air "for maintenance" this morning at 0810 UTC. Thanks to DJ8WX, G3JKV and DL4YHF for the encouraging reports! G3JKV in IO91UF holds the record, 1120km/mW or 700000 miles/watt
Hi Uwe, *many!!!* thanks for the report! The screen shot speaks for itself! Where are you located? Multipath fading, Doppler shift and other ionospheric evilness works against us but nevertheless, QR
Hi All, there is a QRSS10 beacon on 3593.539 kHz (give or take a Hz or two). What does it say? Power is 1 mW into a dipole 8m above GND. 73 Johan SM6LKM
Andy, A serially loaded high-sided driver several outputs, with outpult voltage rating greater than 15V and current > 100mA. such creatures exist! For example UCN5895A. MOS input, bipolar output, 50V
Dear LF group Does anyone have an idea how to design an electronic goniometer? Imagine a "black box" that is fed with two signals from a pair of orthogonal (for example N/S and E/W) untuned loop ante
Rich, It's possible to save this calibration in EEPROM ? Anybody knows how to do it ? Yes, I wrote the firmware... 1. If the CAL switch is held down at power-on, the default calibration value (corres
Andy, it sounds like you are preparing to receive UTC synchronized BPSK QRPppp... LF signals from Sweden? :-) I'm in the midde of some low power, coherent, GPS locked signalling tests on LF at the mo
Thanks for the nice comments Marco. Instead of preventing my receivers from drifting, the Austron 2000C will now prevent my fishing boat from drifting. No big difference. I wonder if the design engin
Hi Wolf and All Thanks for the report! Ten milliwatts are more than enough for 700km on 80 meters, or -in other words- [QRSS "MICRO" picture] - power gave solid copy. A picture says more than a thous
Walter, Marco, thanks for the information regarding the Austron 2000C. I did not get the manual but, although it is an early 70's design, there was a test protocol from Austron taped onto the box and
Hi All Yesterday, I bought an Austron model 2000C Loran-C receiver for about $10 on an electronic junk auction. I also got an Austron model 2082 Loran-C TRF receiver. The 2082 seems to be some kind o
Dear Jim & the LF group Jim wrote: It would take a little care to implement though; if the drive to only one of the totem poles was varied in phase, changing the output amplitude would also change th
Dear Jim and the Group I tried some experiments with a scheme similar to that suggested by Johan - The problem with this is that, while the square wave output contains essentially no even harmonics,
Interesting idea, Johan, but I believe you'll find that if you drive the amplifiers with a sinewave, there is an efficiency penalty; whereas, if you drive them with a square wave, you actually have m
I think the PA supply voltage is variable, but where does the "envelope" signal come from ? Another way to control the output power is to vary the phase of the driving signal to one of the sides of a
