Re: [digitalradio] Re: Bandwidth v Shift in RTTY ?

2009-03-27 Thread Jose A. Amador
Not exactly. You must add the upper and lower keying sidebands spacing to the upper and lower tones to get an aproximate idea of the occupied bandwidth. The sidebands lie at half the signalling speed around the carriers, and the keying harmonics, whose level and width depends on the

[digitalradio] Re: Bandwidth v Shift in RTTY ?

2009-03-27 Thread Dave Bernstein
I understand, Jose. My question is whether the inner tones -- the ones between the ensemble's highest and lowest tones -- contribute to the bandwidth if their magnitudes are identical to those of the lowest and highest tones. Asked another way, is the bandwidth of 300 baud 1 khz 4-tone FSK

Re: [digitalradio] Re: Bandwidth v Shift in RTTY ?

2009-03-27 Thread José A. Amador
Dave Bernstein escribió: I understand, Jose. My question is whether the inner tones -- the ones between the ensemble's highest and lowest tones -- contribute to the bandwidth if their magnitudes are identical to those of the lowest and highest tones. I expect little contribution from

[digitalradio] Re: Bandwidth v Shift in RTTY ?

2009-03-26 Thread Dave Bernstein
In n-ary FSK, if all tones in the ensemble have identical maximum magnitudes, then isn't it true that the maximum bandwidth will be identical that of binary (2-tone) FSK with a shift whose value is difference in frequency between the highest and lowest tones in the ensemble? 73,

[digitalradio] Re: Bandwidth v Shift in RTTY ?

2009-03-26 Thread jhaynesatalumni
--- In digitalradio@yahoogroups.com, expeditionradio expeditionra...@... wrote: Hi Andy, There is no simple universal relationship between the shift and the transmitted signal bandwidth, However, for the particular case of binary FSK where the shift is wide compared to the bit rate, you

[digitalradio] Re: Bandwidth v Shift in RTTY ?

2009-03-25 Thread expeditionradio
Hi Andy, There is no simple universal relationship between the shift and the transmitted signal bandwidth, because there are so many factors other than shift that contribute to the bandwidth of an FSK signal: 1. Symbol rate 2. Shape of waveform 3. Symbol transition point 4. Filtering 5.