[linrad] Re: Linrad focus: .............

[<leif@xxxxxxxxxx>]

There was one thing in your posting:

> I do not think that one saves very much by implementing
> the old 486-series, as cheap boards and capable CPU's
> are available (new) in the range of 40-60 euros.
It is quite clear that 486 machines are a bit too small
but the early Pentium machines are adequate.

> Another issue is the signal delay that will grow with slow CPU's.
Not really. The signal delay is determined essentially by the filter.
Even on a 100MHz machine the processing time is negligible.
Of course it is possible to get some CPU-induced delay by selecting
inappropriate processing parameters, but when using Linrad to
process the output of an ordinary radio, the input bandwidth
is only about 3kHz and the mode is CW. By setting a reasonably large
first mixer conversion ratio, the sampling rate in the baseband
becomes so low that even a 386 would be mighty fast:-)
The limited maximum bandwidth one can set the filter to should
be of no concern in this case.

> If you buy a used PC, make sure that it works.
Oooh! Do not buy any. People have them and you can pick them up
for free - but they are 486-machines now. Very soon people will be
happy when you carry away old Pentiums for them so they do not
have to transport them to the recirculation junk-yard themselves:-)


73

Leif / SM5BSZ




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