NO Think again, the high order bit of a DDS output is very definitely not a squared up version of the fundamental ! Used on its own it would have a spectrum not totally unlike noise. Before the DDS o
PowerBasic (the language I use) does incorporate a "microtimer" instruction for measuring time to 1us so something has always been available in the underlying hardware in the PC, via the same timer c
I've just been reading throught the documentation for Wolf and it all seems rather over complicated for an enhanced BPSK system - having to loop-play .WAV files through some kind of audio-RF interfac
Congrats both. That is impressive, and bears out the value of spread spectrum communications - which is what this mode really amounts to. Andy G4JNT In my haste to get to bed last night, I neglected
How about stations in the 40mW range, even less than Mike ? We do have the advantage of absolute frequency accuracy. Andy Hi all, I haven't said I have quit transatlantic testing. In fact I would lik
Winzip is only an envelope for PKZIP and UNZIP so these two progs are still perfectly valid. Packaged with these should be a utility called ZIP2EXE. Just type ZIP2EXE XXXXXX where XXXXXX is your ZIP
In the early 1980s the VMP4 was going to answer both our VHF power amplifier and wide dynamic range receiver problems, so I scrounged some freebies; couldn't afford to buy any, they were too expensiv
Could that be because the Navy used E55F (presumably = EF55). The active antenna whose description started this thread does use three of these devices. Amongst the mine of nostalgia out there, I ther
Sorry, I confused you all and remembered the wrong device. The valves are E55L Pentodes. (E88CC is a doube triode, sort of ECC88 then they ran out of numbers! ) The E55L presumably belongs to the EL5
I think you have later versions of the 1792. My one only tunes in 10Hz steps and I know others mentioned on this reflector have 1Hz tuning. Wonder if the later version is specified down to a lower fr
Well, my manual shows it in the parts list as 1uF 50V but since the highest voltage in the RA1792 anywhere is 28V, and only 15V on the RF AMP then I would have thought 25V would do. However, the circ
I have access to a RA1792 manual, is there any particualr area / info you need ? Farnell do a radial 1uF ceramic capacitor - part no. 287-064. Andy G4JNT -- The Information contained in this E-Mail a
www.hf-inst.co.uk has all the documentation and can supply the modules. It was also written up in the RSGB's Dec 2000 Radio Communication. With a 5MHz clock source, it will allow steps as low as 1.1m
I was thinking of this aspect as well, for SMT Hell modesl. Most stations do not transvert, so soundcard output gives a problem. The parallel port is difficult, though not impossible, to utilise in t
HF Instruments now have a limited number of AD9851 DDS Chips. These are functionally similar to and have the same connections as the AD9850 as used in my DDS module, and are backward compatible with
Yes please ......... Andy 'JNT The attached JPEG file shows the variable phase and BPSK spectra generated by the circuits with 100ms and 50ms transitions. If anyone is interested, I can send them the
Tnx Jim, I have managed to work out how the coding works (finally !) and can go into that side of things if anyone is interested. Andy G4JNT Dear LF Group, Since somehow or another I seem to have gai
I'm glad the 1000 Hz line is accounted for ! Thinking about this last night there should not be any IM Products at all, as an AM detector will just give the envelope of the pulses as a series of spik
An AM detector will recover the envelope of each of the chains passing through the receiver, and generate audio lines at harmonics of each of the four repetition frequencies. Here are the frequencies
If Jim is coming, perhaps you would be able to give a demo of Wolf ? I can demo standard BPSK with the VE2IQ software and interface. Hopefully a version of WOLF for use with this will appear eventual
