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Digital modes producing less splatter?
2010-01-02 19:52
Registered: 15 years ago
Posts: 34
Hello,
I know we should avoid to use SSTV as it splatter across the band; is because SSTV need a big bandwith? Am I right?

If I'm right, are all digital modes asking too much bandwith?

I've been using FLDIGI on my Sangean ATS909 receiver and I was looking at the waterfall window: some mode, like TRHOB have a tuning window even smaller than CW.

So my question to more expert HamSphere users is: if those digital modes would really use less bandwith than CW, could we use them in HamSphere, of course still paying attantion to modulate max S2-3 on the scale to avoid splatter?

Thank you for your answers and Happy New Year !

73 + 51
--
1HS104 Stefano - IZ3XNJ
HamSphere Admin
HamSphere Italia Frequenza Monitor 21.380
Re: Digital modes producing less splatter?
2010-01-02 20:10
Moderator
Registered: 14 years ago
Posts: 437
Hello Stefano
I too would like to see more digital modes on HS. Regarding the bandwidth and splatter, I'll leave this question for Kelly to answer when he sees this post.... and I know he will.
Stand by
73
Jerry - n1TKO
Re: Digital modes producing less splatter?
2010-01-02 20:33
Registered: 14 years ago
Posts: 122
Also I am very interested this theme, especially on SSTV transmissions.
Re: Digital modes producing less splatter?
2010-01-03 15:03
Registered: 15 years ago
Posts: 34
I have found this comparaison table about digital modes and bandwidth needed. Here are bandwith requirements for THORB modes, not included in the first link.

It seems that BPSK (31.5Hz or 63Hz) or THROB (72Hz or 94Hz) are the less bandwith asking, so this modes should be less prone to splatter than SSTV, which requires, for what I know, 1,100 Hz.

Maybe there is a threshold value to be under to avoid splatter...

73 + 51
--
1HS104 Stefano - IZ3XNJ
HamSphere Admin
HamSphere Italia Frequenza Monitor 21.380
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