The point is that 3 kHz bandwidths may not be appropriate to achieve the best performance. As pointed out in other messages, the phase delays are worst at the edges of the bandwidth. This means with a typical amateur radio, you may only want to use 1.8 or 2.0 kHz to achieve the best group delays. Jim WA0LYK --- In [email protected], Mark Miller <[EMAIL PROTECTED]> wrote: > > I agree and this concern has been considered in this thread. The modem > used in the MIL STD 188-110 MARS ALE implementation was modified to > accommodate amateur rigs. With the exception of SDR radios, COTS radios > will typically have a 2.4 to 2.7 KHz transmit bandwidth. I agree that if > these radios are to be used, then this bandwidth limitation needs to be > taken into consideration. This is why we test these sort of things. I > think for HF bandwidths of 3 KHz are most appropriate. That is just my > opinion. > > > >My main concern is that as higher performance modems > >are discussed you can't just forget the RADIOs they are connected > >to. In the end, we are talking about a total system being required > >to maximize throughput. Not just wider bandwidths, and more tones. >
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