Hello Jim.
No, you are right, PSK31 signals are inherently narrow, unless the
modulation stage of the radio is been overdriven, PSK31 signals width will
be only about 100 Hz, when properly adjusted a good quality transceivers
will usually show an IMD readings of better than -30 or -32 dB when signals
are strong (S7 to S9+10) at the receiving end; under such circustance, IMD
of -30 dB or better, PSK31 signal width will be under 100 Hz; for signals
above S9+20 dB signal width will tpically be about 100 to 120 Hz.
73/DX Joe, YV5LIX
-----Original Message-----
From: topband-bounces@contesting.com [mailto:topband-bounces@contesting.com]
On Behalf Of Jim Brown
Sent: Monday, April 26, 2004 12:30
To: topband@contesting.com
Subject: Topband: PSK-31
In the recent discussion of allocations and band segmentation, someone
seemed to be suggesting that PSK31 was a broadband mode. When I look at
signals on my PSK31 software, they seem rather narrow band -- typically
under 100 Hz -- unless the transmitter audio stage is being overdriven to
produce IMD and HD, in which case the signals can easily get 1 kHz wide. Am
I missing something?
Jim K9YC
_______________________________________________
Topband mailing list
Topband@contesting.com
http://lists.contesting.com/mailman/listinfo/topband
|