On Mar 19, 2007, at 5:36 AM, Dohn wrote:
If one centers their filters at 2210 Hz in RTTY mode for use in
RTTY, then
is RTTY no longer the mode of choice for PSK31? Would you just use
USB for
PSK31 and adjust your speech compression? Are RTTY and PSK31 both
useable
with RTTY mode with filters centered around 2210 Hz?
PSK31 can be used at any center frequency, so 2210 Hz won't be a
problem.
I use Cocoamodem and MMTTY for RTTY, and have adjusted them for
frequencies of 1415 and 1585 for Mark and Space, respectively. This
gives me a 1500 Hz center frequency, which is perfect for using the
DSP filters as well.
One problem with using 2210 Hz as a center frequency with the K2 is
that you may not have sufficient BFO range to center your filters for
both sidebands. You may have to modify the BFO to get greater range.
Having both sidebands centered is important. Even though you might
only use the LSB sideband for RTTY, remember the sidebands are
swapped on 15m and above due to the inversion.
Bill Coleman, AA4LR, PP-ASEL Mail: [EMAIL PROTECTED]
Quote: "Not within a thousand years will man ever fly!"
-- Wilbur Wright, 1901
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