On the IC-746PRO mailing list, a fellow posted:
I was having problems using packet last night on my 746PRO, and after determining the issue, felt that others in this group may be interested in this little pearl of wisdom.
I was attempting to connect to a telpac node from my KAM+, but could not establish a link. I was getting signal back from the telpac node, but no connection. I checked all the usual suspects (d-mode, xmit power, frequency, etc) to no avail. At first I thought my KAM+ had failed, but it worked OK with a different radio.
Then I noticed the small ‘nr’ icon on the front panel indicating that I still had noise reduction engaged from when I was down on 20 meters. After turning off NR, packet worked like a charm.
So if folks are having trouble with not being able to establish a
packet connection, check to make sure that noise reduction is off.
I did something similar while operating PSK31 a couple of weeks ago. I heard someone calling CQ, and called him, but noticed that when he came back to me, he was about 50 or 60 Hz off from where he was calling previously. I clicked on his signal, copied his transmission, sent my first transmission, and when he came back again, I noticed that again he was off about 50 or 60 Hz.
Then, it hit me. He wasn’t off, I was. I had forgotten to turn off receiver incremental tuning before switching to PSK. I was the one sending off frequency, not him.
So, the moral of the story is to make sure to change all of the settings when changing modes.
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