Surely a DDS runs off a 5V or 3.3V regulated power supply anyway so no 100Hz there from a power supply? With strong signals (over +10dB) I see the 1.465kHz sidebands but no other spurii. I have had
A few years ago I found an aluminium beer keg which had been used for mixing cement. As it was damaged it was no good returning it to the brewery so I have just moved my LF loading coil into it and p
Thank you Alan, the location inside makes your suggested spacing, suspended and spaced on fibreglass rods. It needs more Tx testing as a few brief reception reports were about 5dB down but that was p
It just sits on a corrugated steel roof which is grounded so a strap from keg to roof would also prevent any "diode" action when transmitting. I have just made s field strength device which will be i
There were two Powys Amateur radio Club 2m cavity resonators at a commercial transmitter location south of Newtown in Mid wales. They did have a tendency to drift off frequency, probably according to
I must thank Alex (R7NT) for his carefully collated, weekly reports, it helps to coordinate everyone's LF tests. For some reason I haven't been receiving him well or often though there are times when
For LF reception there's no great secret. A decent communications receiver tuning down to 30kHz combined with a wire aerial broadly (or sharply) tuned to 136kHz, a correct loading coil should do the
Of course, Mike reminded me, I assumed a receiver of choice will have things like agc fast, slow, on/off and so on plus a noise blanker. One reason for suggesting various tuned circuits depends on th
Hello Chris. I generally see a large number of sidebands when you are using WSPR but I lost the notes I made on frequency and levels from everyone's transmissions. The worst sideband was not the nea
Hello Luis. Medium and large paint containers are usually slightly tapered to maximise storage space when empty and the plastic is generally polypropylene, sometimes polyethylene. Using various sizes
Definitely the receiving station has not entered details correctly. I would hope this would be corrected promptly once the station operator has looked at the results (eventually). Hugh, M0DSZ Why do
I can't really help, for some years I've had 2 industrial 25A filters in the shack supply, one in the house and one in the shack to alleviate QRM from local, crappy power supplies coming through the
There was an extremely pronounced collapse in s/n for a specific time, I hadn't spotted anything quite so large before. It's a shame there weren't more stations transmitting on Opera or WSPR. Hugh, M
Same here, the shack is very small plus the forecast of electrical storms which missed us completely. Hugh, M0DSZ. On 21/07/2016 14:50, Mike Dennison wrote: Ordinarily I transmit (and receive) Op32 o
I had a QRSS signal from about 0042-0300 early this morning but the saved screen had very poor definition so I'll rectify that tonight (if anyone is on). Hugh M0DSZ
I'm pleased someone was monitoring, I suspect conditions were not too good. This is a new linear amplifier but, in spite of having more input power, doesn't produce much more antenna current. Hugh, M
Effectively linear amplifiers, class AB2, one 300W and one 500W dc input with very low output impedance. The antenna current difference is less than 5% so the expense of a new PSU, case and so on is
Home-constructed, originally mixing 2 Philips crystals (fine for QRSS) but now with an alternative plug-in digital oscillator. 3 modulation setups are available, straight (keyed for QRS or Opera), ph
G3XDV received with good signals, my Opera (1.5.8) has stopped uploading and therefore reporting in spite of having the correct port connections. Hugh, M0DSZ On 31/07/2016 15:25, Graham wrote: 24Hr 1
Thank you Alex, it seems both my Opera and WSPR are not uploading properly as I had several good incoming signals. Hugh, M0DSZ On 31/07/2016 17:05, Alex R7NT wrote: Jul 30-31 Best QRB/reports WSPR15
