please note, that with the optional CW- Filter installed and using
PSK31-U with NAR filter on, you are most likely NOT TRANSCEIVE !
I mean, that bandpass is offset by about -200Hz, when switching NAR
on or off, but your transmitter is always on the USB-Wide passband
and so you transmitt on a different QRG than you receive, with the CW
filter on!
the only workaound I found is to use DIGITAL MODE SETTING: USER-U
instead of PSK-U
Any other comments?
vy 73 de oe3mzc@...
Mike
--- In FT817@y..., "Dr Thomas A Clark" <w3iwi@y...> wrote:
Hey Gang,What would be best 300 or500hz filter for CW if one was
going to do PSK-231??Len
With PSK31, the real bandwidth you use is set by the DSP filters in
the soundblaster-based PSK31 software you use. The reaso for using
a
narrower bandwidth filter is to reduce the clutter & intermod & AGC
pumping & SoundBlaster dynamic range problems.
Here I'm using the INRAD 500 Hz filter (which seems closer to 600
Hz
in practice) and it works well. As a hint when you use such a
filter.
Push the CLAR button for 1+ seconds, and the SEL knob becomes a
passband tuning control. This can be used to select the stations
that
are in the passband. Often I can push an offending "bad-guy" off
the
edge by using this PBT control.
Here I found that if you set #26 DIG=PSK31-U, toggling the filter
on/off causes a ~30 Hz frequency shift. Instead, set #26 DIG=USER-U
and this annoying bug goes away.
73 de Tom, W3IWI
