Discussion in 'Amateur Radio News' started by NN2X, Oct 7, 2018.
So much thread drift; so few pages!
It's a modern miracle!
Brevity is the soul of wit ...
Much like any conversation with a room full of people. The likelihood the topics amongst us will drift is high. Particularly if the original subject is already well-covered early.
Here is why I am a big fan of JS8CALL
It simply allows the ability to have a QSO at 20wpm at -24dB below the noise floor
Lets look at other means of working DX
1. BPSK31 requires at least 6dB above the noise floor to close the link (Along with RTTY)
Lets say you are using 1,000 watts to close the link, with JS8CALL only required 1 watt to close the link (30DB difference)
Yes, BPSK31 can work at 50wpm, but now JS8CALL can work at 20wpm. Not bad
Now lets look at CW
At very best CW works about -10dB below the noise floor at 20wpm.
Lets say you are using 200 watts for CW to close a link, all you need you need is 8 watts with JS8CALL (All at 20wpm) (Delta 14DB)
And we all know the program (And digital modes in general) will continue to advance, this is where the innovation will be for years to come.
Io.groups is a good spot as I believe it offers chat, message and archive resources in one place The instant sign up, easy download of fast coming versions seems to provide easy development for fast coming versions. The downloads are painless, install quickly and easily while providing instant radio interface with no hassles. I think this mode is terrific as it is similar to FSQ, another fav but with ten db more sensitivity. Oh, Girthub has been scooped up by Microsoft I believe.... what could go wrong here?
Very cool innovation. Thank you Jordan.
Here's the info file..
A calculated value of -24dB SNR means that the real effective SNR is closer to -18dB. Half the signal is provided out-of-band (the clock). That changes the real SNR value that was achieved by the modem by half, as well.
If the SNR is being calculated the same way WSJT-X is calculated, it has a number of additional skewed terms added to the SNR (or rather subtracted), as well.
I have never been a fan of the way WSJT calculates the signal. I fully understand WHY it was done the way it was. Yet when people start using other SW to try and compare the pros & cons of one vs. another, the numbers become skewed.
>>>Nerd mode = ON<<<
What I dearly wish people would start to do is to reference the 99% BW of the transmitted signal
and start using positive SNR values for a given BER %. That's the way I/we talkabout digital comms in the commercial world. We don't reference things to the noise power is some almost arbitrary SSB filter BW. For SSB, sometimes I like 1.8kHz and others 2.9kHz, but somebody else picked 2.2kHz. When/where do you stop?
kTB = -174dBm/Hz
SNR = xdB above kTB for a given BER.
>>>Nerd mode = OFF<<<
both FT8 Call, and this new mode require people to create a new login, and forcing you to give them your email address! This is ham radio software, not some email gathering scam... or is it maybe both? I am not going to download either of these until I can download it without having to hand out my email! This seems excruciatingly LAME to me!