[Yaesu] FT-897D transmitted noise

[Paul]

Mike and the rest of the reflector,
I tried your suggestion about activating the DBF in receive and then 
transmitting. As you stated the noise was greatly reduced. I also went a 
step further and activated the DNF along with the DBF in receive and the 
noise was just about completely eliminated. In testing with my local 
friend and his 897 on 70 centimeter SSB we had "S" meter readings of 
about S6 on each other with the mic gain turned all the way down thereby 
eliminating all background room noise. After turning on the DBF the 
readings dropped to S3 to S4. Turning on both the DBF and DNF dropped 
the reading to below S1. I don't know what is going on but obviously 
this is a great work around for the noise. If you don't want to alter 
the receive bandwidth when you kick in the DBF you can leave it in it's 
widest settings. This does compromise the usefulness of the DBF as an 
auxiliary filter but it may be the only way to have clean SSB 
transmissions with this rig. I spoke with Ron at Yaesu and he had not 
heard of this problem even though the yahoo posting you referenced was 
from 2004. I would have thought Yaesu would have heard of this complaint 
by now. Anyway, he said he was going to mention it to some of the other 
guys including Chip. I told him I'd call back in a week or two and find 
out what they may have come up with as a fix. Hopefully he wasn't just 
paying me lip service and they really will look into this.
Paul, N5PS

  
----- Original Message ----- 
From: "Mike Miller" <mike.kc9doa at sbcglobal.net>
To: "Paul" <pss at tecinfo.com>; <yaesu at mailman.qth.net>
Sent: Tuesday, September 12, 2006 11:07 PM
Subject: Re: [Yaesu] FT-897D transmitted noise


I just read something about that on one of the lists and I
thought I'd saved it because it applies to the 857 as well.
Anyway the gist of the post was that turning on the  receive
digital band-pass filter noticeably reduced the  transmitted
noise. It went on to describe setting the HPF and LPF
frequencies to minimize the BPF effects on receive.

I don't know if it works, but it doesn't cost anything and can't
or shouldn't hurt anything so give it a try. I'll see if I can
find the original post so they can receive the credit.

Mike kc9doa