Dave,
I have 200 Hz and 400 Hz filters in my K3. My K3 copies RTTY fine through the
200 Hz filter. That being said, I normally use the 400 Hz filter unless the
band is crammed with signals during a contest. The 200 Hz filter also reduces
a the apparent signal to noise ratio between my ears
My K3 copies RTTY fine through the 200 Hz filter.
This is much like the old ads I worked 150 countries with my
Gotham vertical ... When one tries to pass a FSK signal through
a too narrow filter it doesn't just stop working. However, the
tight skirts of the filter cause the energy in the
On 11/29/2013 6:25 AM, Joe Subich, W4TV wrote:
My K3 copies RTTY fine through the 200 Hz filter.
This is much like the old ads I worked 150 countries with my
Gotham vertical ... When one tries to pass a FSK signal through
a too narrow filter it doesn't just stop working. However, the
tight
My first thought on seeing that was If that filter is such a great idea,
wouldn't it be built into the RTTY demodulator to begin with?
73, Carl WS7L
On Friday, November 29, 2013, Jim Brown wrote:
Thus, I was quite wary of using the double humped response provided by
the K3.
Which two of the 200/250/400 and 500 hz filters are best for digital
use, primarily RTTY, both contests and dx. I understand that for JT-65
and PSK the standard ssb filter, or even the AM filter is useable. I am
concerned that the 200 hz might be too narrow for RTTY. I work some CW
but
I am concerned that the 200 hz might be too narrow for RTTY.
The 200 Hz filter is too narrow (mine measure about 190 Hz at -6dB).
The 250 Hz filter - nominally 370 Hz at -6dB - is a good match to
the minimum necessary bandwidth for MMTTY, 2-Tone, etc. to function
well (particularly if the DSP
I have a 250 Hz filter I use for PSK and RTTY. It helps when
there is a strong nearby station that overloads the AtoD
converter between the K3 and my computer. During a RTTY contest,
I found it helped, but the dual frequency DSP RTTY filter was
more than enough for most contacts.
When I use
I work quite a bit of RTTY and have 223 DXCC using only the stock 2k7Hz
filter squeezed down to 2k0 with DSP for general tuning and running the
split channel on a DXped. The 500hz five pole is used for the DX
station and if I'm handing out a few points in an RTTY contest and need
to suppress
IMHO, RTTY is like AM -- a classic mode which uses more bandwidth
than necessary, but is nice to keep around for nostalgia and to
relive history.
RTTY is not like AM in using more bandwidth than necessary. *ANY*
FSK signal will have a minimum bandwidth (as defined by ITU) of
(1.2 * shift +
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