What is needed is a suitable very narrow bandwidth receiver design to go with the DDS effort we are making over here with the AD9835 DDS device. I am also prepared to share in the Transmitter effort
Phone message from Mike, GW3XDV/P. He hopes to be QRV on around 71.7kHz from 1800 hrs local (1700UTC). If no activity then he will QSY to 136kHz. Rugby is on again as strong as ever at S9 +45dB here
Mike, GW3XDV and myself tried a QSO on 71.63kHz without success. It is interesting that, in spite of both of us being to able to feed 2amps into reasonable antennas, nothing was seen or heard both wa
Hello all, I had a 72kHz contact with M0BMU at 1200UTC The GI3PDN and MI0AYZ operation from a disused Decca site came on the air at around 1300UTC. When I first heard them they were in contact with G
Marco My QRP DFCW beacon is active again for the weekend. Power is 10W to the aerial, so about 10 mW radiated (0.55A into 32 mOhm). Excellent 'O' signals from your beacon tonight 2230UTC; very stable
Yesterday, Monday, I operated from GB2CPM, not on LF but at the HF permanent amateur station that forms part of the radio section of the museum. At the Electricity Hall a group of Telso Coil builders
Hello Stewart Nice article. Would it be OK to put an edited version (with credits) in the Crawley Club newsletter? Yes, by all means. Note that I spelt Tesla wrong in the mailing -- Regards, Peter, G
Walter The UK Decca Navigator transmitters shut down for public use this weekend. Most sites have already been sold for other purposes but a few will remain in working order for a few months. I have
Tell me Rik, why is there no qrss(LMCW) when the band is noisy like lots of qrn/static about. It should not be a problem if you can read signals 20 db below the noise. My ANSWER after monitoring and
Dear All, First of all I wish to thank all those who sent in material for the LF book and also for those who have given permission for me to use material from their websites. It is interesting that w
I am working on the Receiver chapter for the LF book. I have a good introduction written by John 4GVC (with a description of the TS850, which caused many of us, including myself, to go this route) bu
I feel cheated - everyone else seems to have 1 Hz steps The TS-850 readout resolution is 10Hz. However the tuning appears 'smooth' between the digits. When I set the receiver for slow CW the receiver
What happens when you press the 'Fine' button on the numeric keypad ? Doesn't the tuning step go down to 1 Hz ? Time to dig out again the manual... I think the tuning step is 1Hz all the time. All t
Alberto di Bene wrote I made a simple test. Using the Up-Down pushbuttons on the mike, the step for each pression is 10 Hz or 1 Hz depending on the 'Fine' setting. The display has the resolution fixe
On the 10th of March I received an e-mail from Alan Melia saying that Brian Rogerson, CT1DRP, was in a position to receive 73kHz signals; although all he had heard to that date was Rugby. Brian was k
I have obtained some Litz wire from Derek at the Crawley radio club. I also borrowed a 800W solder pot but did not have any information regarding working with Litz wire. The sample of Litz wire that
Measurement of Antenna System Impedance at LF Although a suitable matching transformer can be arrived at empirically the design can be simplified if the antenna feed impedance is known. An impedance
Yesterday evening I suggested that you all try and look for the mystery signal on 137.60kHz There were a couple of reports but no one guessed what it was. How about trying again tonight Use Spectran
Hi all the only trouble is that a lot of us use LSB on 136 to drop DCF39 over the edge of the filter.......this results in and upside down message....literally. How do you use the Spectran frequency
