[UK-CONTEST] DUMP PSK use AMTOR

[cris at gm4fam.plus.com]

Puzzled why the much faster PSK 65 is not used more often.

The very few DXpeditions that have used that mode in preference to PSK 31
have at least doubled their rate of QSOs; so this aspect should appeal to
contesters too - especially the mixed digi CCs!  Admittedly it occupies a
wider bandwidth than 31 but its still less than RTTY.

73 Cris
GM4FAM


>> BTW, If anyone has bothered to read this far and is having trouble
>> decoding,
>> try the 'Signalink USB' external soundcard interface available from
>> ML&S.
>> Works brilliantly with MMTTY, Digipan and MIXW, even with Vista!!!  You
>> do
>> need to adjust the signal levels correctly - but you get physical
>> controls
>> on the box to do it!
> And a similar couple of hints, for those not using interfaces with built
> in audio interfaces:
>
> 1) If you're using a laptop, the built-in soundcard's input is almost
> certainly very poor. However, even the very cheap ~£2.50 USB audio
> modules that can be found on eBay are usually much superior, and
> entirely suitable. Combining one of these with a homebrew interface for
> isolation works well, and is substantially cheaper than a MicroHam or
> similar if you're experimenting for the first time. I've not yet done a
> side-by-side comparison of performance, but it would be interesting to
> try!
>
> For those who enjoy construction, Gavin, M1BXF has combined his version
> of the above with another USB-RS232 adaptor in a single box to give CIV
> control; it's quite a nice project: <http://bit.ly/huiLCc>. Total cost
> ~£25, I think.
>
> 2) If you're using a sound card, ensure that any driver-type DSP is
> turned off: this is variously labelled in different models, but noise
> reduction, echo cancellation, or anything that claimed to improve the
> sound is almost certainly unwanted when using the sound card for
> datamodes! This has reared its head on a number of machines I've seen
> where people were struggling to get successful decodes on DSSTV, with no
> initially obvious cause.
>
> Cheers,
> Rob, M0VFC
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