Has F6CNI managed some sort of magic noise reduction system, or is it a just a case of being in a very quiet location... These are pretty impressive S/N values 2010-01-27 20:14 G4JNT 0.50387
In its plain text mode which you have used, it can cope with just 13 characters. See http://www.g4jnt.com/Coding/JT4_Coding_Process.pdf and the WSJT documantation Andy www.g4jnt.com 2010/1/19 Gar
Overlapping emails :-) Think this was answered in the one just sent. JT4 and JT65 have similar input message formats, its just the to-air coding and FEC technique that is very different They do
-24dB S/N (2.5kHz ) is usually guaranteed Andy www.g4jnt.com This email has been scanned for damaging side-effects by the health and safety police, is guaranteed to contain no substances hazardous t
Ah... I wonder. Jim's DT setting for your sigs is around +2 seconds. Which means in the opposite direction it would be -2s. This is a bit marginal. The WSJT modes were designed originally fo
Download WSJT from http://physics.princeton.edu/pulsar/K1JT/wsjt.html and have a go !!!!! Then when you decoded Gary's signal, fire up your 10GHz and 2.3GHz receivers, adjust the mode to JT4G a
Good.... Confirms exactly what I assumed. 5dB in 24Hz (which is about the same effective bandwidth of a good pair of ears) is -15dB S/N in 2500Hz Its interesting, too, that SSB is readable at fa
My thoughts precisely. The phrase attributed originally to Solon the Lawmaker of Athens in 437 BCE (or thereabouts) and subsequently Douglas Bader As mentioned recently, I tried to apply for a
The transmitters likely will be. We did well enough when Decca closed. Andy www.g4jnt.com On 8 February 2010 21:41, <[email protected]> wrote: Wonder if the loran sights will be up for sale. Sh
I don't use a Bird wattmeter. Don't trust any directional type of meter for proper power measurements. I have a 1GHz specified 30dB rated 1kW Bird attenuator (calibrated) plus HP 432 power meter
BINGO - Tnx Rik, thats it, convincing. Sorted So my thing IS 1:4 turns ratio, (1:16 Z ratio) just as the calculations said it needed to be, and is indeed, effectively, an auto transformer. Oth
An experimental system I tested for work a few years ago used the low cost optical components from RS, the HBR2404 and 1404 devices with polymer cable. This was for a remote wide band antenna with f
Yes. Odd that. Increased spectrogram noise reading when it ought to be filtered out I suspect the spectrogram is not a simple power level indication. SpecJT appears to be more of a CFAR indicatio
To try to get to grips with the falsely high values of S/N reported by some stations recently, I made a set of controlled measurements over a direct link using a range of Rx bandwidths and input sig
Jean - Pierre... Is the circuit diagram correct ? Your two final op-amps used as differential amplifiers both have their inputs taken from teh same ndes, yet are labelled to deliver I and Q. Th
Yes, unbelievable isn't it! Been going gon for abt 4 weeks now. Andy www.g4jnt.com On 26 February 2010 13:46, Graham <[email protected]> wrote: Warren , If you think this is bad, you should t
Has anyone got practical experience of the output matching transformers used on MOSFET PAs - I've got a confusing one here? I recently acquired some big HF PA modules, each rated at over 1kW out, a
From a curve in an old 1981 copy of "Reference Data for Radio Engineers" , at 10kHz (lowest value shown) atmospheric noise is given as being in the in the range 155 to 175 dB kToB. This will have r
