Apparently HF Instruments have just sold their last unit. They said the same to me, but they added that they have the AD9851 model, which is an AD9850 plus an internal clock multiplier. And goes to 1
20 LOG (V1/V2)= 20dB down About 10 Watts - but still a lot. We all fall into that dB trap from time to time I bet !!!!!!! Andy An interesting number: If Jim's measurement of MM0ALM's field strength i
That's neat! But I make it 0.0083333 Hz resolution, (still OK nice value though) and can't be locked to a 1PPS signal. Better still, use it with an AD9851 chip using the x6 PLL multiplier for 50mHz s
OK. It looks like we already have a standard. Andy, can you describe your protocol? I'll send it out under separate cover. If we all clock our DDS chips with 5 or 10MHz from frequency standards, we w
From John Bodin It would be very nice if we could agree on a simple serial protocol that would allow any PC program, be it DOS or Windoze, to take total control over the DDS (I know that Andy G4JNT h
My last posting on this subject fell on deaf ears so here is a direct appeal Would it be possible for one of the highly expereinced Soundcard / Win95+ programmers outhy there to produce a SB compatib
Interesting that there appears to be no sign of the callsign ident..... This was sent every 15.1 minutes approx (the .1 was the callsign itself) 24 WPM as on-off keying, completely independent of the
- From: boffin1 [mailto:[email protected]] Subject: LF: Phase meter? I have belatedly seen your queery about phase. In the abstract their is no answer to your question for phase reqires a refere
Oh yes, forgot to say it was 30 bits long this time :-( Transmitted from 1800z through to 0745z The sequence I sent was 010100010110101001010101011101 Which is not what you received, but : Inverting
Who's using high power, I'm certainly not ! 3-4 Watts of RF to a 7m high Tee gives about 0dBm ERP Or -30dBW, or 1mW, in other money. Andy 'JNT I hardly think a sub 0dBm ERP transmission is going to c
Well done, you even spotted the c__k up, that period at 2250 is rather embarassing - I hit the master switch on the test equipment rack intending to leave just the radio equippment bench powered. Tro
Yes, but if you'd seen previous EMails you would have realised I must use this frequency for other reasons. G3PLX, who prompted these PSK transmissions, is developing a very simple cheap and cheerful
A request for anyone out there who was receiving RadCom or any other magazine, before I joined in 1975...... I'm looking for the reference to the Huff-Puff stabilisation scheme, and in particular the
I think the soundcard stability is too poor to be able to rely on for phase measurements. Instead, how about a phase meter that works by comparing the phase of a signal on the left channel input with
There has been quite a lot of comment recently about 7FSK and the bandwidth it takes up. The only transmissions (other than my initial tests) were by Jim who seemed to be using quite a wide spacing r
Firstly, Jim, can you send me a copy of your vectorscope circuit please - it may be a case of "Coals to Newcastle" but I'm intrigued ! Now, how about the next version, a direct conversion receiver ge
No, DCF39 is an FSK transmission, so after a burst of data the resulting carrier phase will settle to some random new value. Look at the DCF 77.5kHz transmission for a phase stable signal, or try for
I was going to make a GPS locked PSK-CW transmission tonight, but will postpone for the Hell tests. Tomorrow (Friday) look for PSK-CW on 137.450000 kHz starting at 1900.00 UTC. 'Dot' period will be 1
A difficult one, if you are after software that automatically decodes the message. But the beauty of GPS locked signalling is that the need for carrier and clock recovery has been removed. Provided t
