[RTTY] RTTY spectrum analysis article

[iw1ayd - Salvatore Irato]

As Bill wrote and I perfectly agree: clever!
I would also like to somewhat rephrase Bill, trowing in my short 
experience: clever and effective notes, FB, TU!
As usual, IMHO, a picture make much more clever than a tons of words.

I already made my tests with my FLEX 3000. Having my feedback on various 
scenarios, like FLEX to ICOM and ICOM to FLEX.
The best TX configuration I find out is the FLEX in TX with the MMTTY 
tightened TX BPF, 512 tap and a FLEX TX filter of 400 Hz  (no more than 
500 Hz).
I would test 2Tone, but not for now. By now I use it like a II RX 
windows together with MMTTY FIR having great results at any time.

Empirically I could say: WOW! It's easy to get rid of those large M/S 
with the proper AFSK tones configuration and also they could becomes 
more better than those FSK generated tones!
Remember that MMTTY is somewhat aged even if well maintained.

Then I switched back using 7600 for contesting, when not at home, not 
too easy to check Pout and ALC for peoples not acquainted to it. 
Contesting means M/S or M/2 for me, some 2 or more operators have to 
share the same setups. Two at least of each of those, operators and 
setups. But after even after tens of minutes of steady RUN with a good 
rate somebody get into my <500Hz filters. So, my signals aren't quite 
offending statistically speaking.
They don't get the same noise I get from theirs signals or they wouldn't 
come so near to me. I know that there are several other facts about, but 
just to summarize this may sound.

At home my FLEX run this way, TX BPF & tight TX filter,  since then, 
almost 2 years ago.
So, to who was telling here about ... there aren't transceivers that 
could do the right job even transmitting FSK ... may I answer: no sir 
there are already those radio, such as FLEX and, maybe, others SDR TXing 
boxes with.
Still taking care that I whistle inside my SDR, but in the right way.

BTW one of the fact is that each of the brands that work for ours market 
doesn't find so appealing to have great features like variable and tight 
TX filters.
For brands that made DSP tone generation in the TX MF this add on would 
be quite just a matter of some and several line of code to be added. 
Some lines for the filtering and several lines to give us the control 
about all the parameters on the menu: set and forget or use external CAT 
cmds with some more lines of code. Bat you know the marketing versus 
engineering is anytime a win win by the first group. I already read 
something like that here, so ...
Anyway there is a well known radio brand  that had make newest BF 
filters worse than the oldest and kindly refuse to add useful CAT commands .

Hope my poor English and my short experience could be sounding here.

         73 de iw1ayd, Salvo