Hi Ron,
I'm pretty much done with my testing on decoding PSK31. Using the method I
tried, now I don't have to use the CW mode to help spot the right frequency
to tune to in data mode. I trained my ear to recognize the 1010 Hz spotting
tone that Lyle, KK7P, pointed out. And it's been much more
Lyle and Ron,
Lyle, thanks on the PITCH freq for PSK mode. That would explain why that
macro has the IF shifted to 1100. I've spent last two days using W1AW twice
per day data transmissions as a reference and have now developed an approach
to more quickly gain success as PSK decodes and reduce
All that really matters is the shift (170 Hz) and rate (45 bps/60WPM,
or 75bps/100WPM). The radio takes care of the rest, so you can use the
ptich that you prefer.
I've heard lots of stories about why the 2125/2295 Hz tone pair was
used. Some of the stroies make sesne, but I haven't taken
On Aug 14, 2010, at 8/149:57 AM, Dennis KB7ST wrote:
KB7ST: What is the advantage of choosing a MARK tone other than 2125?
Many RTTY ops don't like to listen to such a high pitched tone pair in
their headphones. If you are tuning by ear, it is also easier to
figure out how far and
How does one tune PSK31 on the K3 such that the built in decoder can
read it. Tuning seems to be very selective and without a waterfall
nearly impossible to tune. The capture range of the AFC doesn't seem
to be very wide. The CWT spotting function sometimes helps but only
on stronger signals.
1) Use CWT.
2) Use a narrow filter. Once you find the station you want to copy,
tighten the filter and retune as necessary. 50 Hz is not too tight.
300 Hz is too wide. If you are hearing two stations, then the
selectivity is not tight enough.
3) Use auto-spot. You may have to hit it
On Aug 12, 2010, at 8/129:09 AM, Lyle Johnson wrote:
... Tuning is critical and an error of more than 5 Hz changes from
solid copy to no copy.
With a binary PSK demodulator, you can be off tuned up to an amount of
plus or minus 90 degrees of perfect phase coherency between bit
Ron,
I share the same challenges with PSK and RTTY decoding. My baseline is to
operate my K3 while RV camping and to explore as much as I can without using
a computer. I don't have full answers and folks like Lyle have been most
helpful. I was last on HF 25 years ago so my K3, SN 4335, is
One thing that is important to remember is to make sure the threshold setting
is
set so that the signal indicator on the CWT meter is set to beat with the
signal.
If you have it set for copying moderately strong signals and you try to copy a
weak
one you may need to adjust the threshold a
The K3's PSK encoder and decoder (used in DATA: PSK D mode) uses a
pitch just above 1,000 Hz.
If you narrow the badnwidth and use the CWT feature, you'll get the PSK
signal. YOU can use the SPOT function in conjunction with the CWT
indicator in this mode as described in the K3 manual.
For
Thanks to all that replied. I guess the problem is not with me... I
expected PSK31 operation to be less critical after playing with
Digipan. I also had hoped to use the computer interface to
incorporate PSK/RTTY operation into my home brew logger/station
control. But between tuning
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