[1000mp] MkV and strong signals

Thu, 2 Jan 2003 09:19:07 -0700

You might try using AFSK instead of FSK, allowing you to use SSB or
PKT(LSB), where you can fool around with the edsp filters more. Go into menu
77 and turn off the ssb-r edsp filter if it's not already off. I think I
remember a recent post that said the manual says it defaults to off but that
it really doesn't. Experiment with the cw-r filter too, by the way. On cw,
that extra edsp processing seems to reduce the dynamic range. The ssb filter
may not be as dramatic, but give it a try. Not sure what effect it will have
on RTTY. You can also fool around with the VRF preselector (if on high or
low bands, but not 30-20-15 meters) and the shift/width controls to reduce
the effects from nearby strong signals.

73,

Brian, W0DZ

-----Original Message-----
From: [email protected]
[mailto:[email protected]]On Behalf Of Jim Martin
Sent: Thursday, January 02, 2003 2:49 AM
To: [email protected]
Subject: [1000mp] MkV and strong signals

Happy New Year everyone!
I am having severe problems with the MkV  and MMTTY on a busy band.  When a
strong signal starts up many KC/s away the trace on the display drops almost
to zero and I have problems decoding the station I am listening to.  All I
can hear is this off frequency station, everything else is obliterated! The
IC746 works much better so I assume I have messed up some settings.  I have
tried IPO on/off and AGC off, both help but not enough.
The MkV filters fitted are as follows
8.2 MHz   250Hz  and  2.0KHz  both Yaesu
455KHz   250 Hz(Yaesu) , 400Hz (Inrad), 1.8Khz (Inrad)
400Hz Inrad second RX
I am using FSK with the mode set to RTTY.
SSB and CW operation seems fine ( but maybe it should be better?)  How can I
check for myself how the rig is performing?
Any comments on menu set-up and filter selection would be appreciated.
Thanks
Jim  MM0BQI

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