Fw: [Yaesu] FT 8100 Feed back probs
Mills, Chuck
millscl@msx.upmc.edu
Mon, 3 Nov 1997 08:45:37 -0500
Yet another 8100 with the same problem...for all of you that are
wrestling with this...here's what I've found with mine:
1> High SWR Seems to make it more suseptable. I threw an SWR Meter and
a Bird WATT Meter on it and both were showing over a 2:1 SWR...this
seemed to cause the lock almost every time. The wattmeter was showing
only 24 watts out (out of the max on high) at the feedpoint. The radio
was cutting down power but still not doing it.
2> On a frequency of around 147.480 Mhz, I was getting interference from
somewhere at certain times. It seems that when the interference
(probabaly from my vehicle - 1993 Ford Explorer) is present, it is very
likely to do a lock into Tx mode. Also, to eliminate the possibility
that it wasn't my vehicle, I check ed for the the interference at
different locations...I was always able to reproduce it.
3> Putting the squelch knob all the way clockwise helps cut down on the
locking too.
All of these are obviously just work arounds but I would advise checking
the SWR. I had a very bad ground and didn't know it. I now run about
1.3:1 SWR and it doesn't lock anymore. I agree that Yaesu needs to look
at this problem, however.
73,
Chuck / W3YNI
> ----------
> From: Thomas Johnson[SMTP:ThomasJ@shbank.com]
> Sent: Sunday, November 02, 1997 20:54 PM
> To: yaesu@contesting.com; ne1h@tornado.ne1h.radio.org
> Subject: Re: Fw: [Yaesu] FT 8100 Feed back probs
>
> Its interesting that I bought 2 of them (one for car and one for base)
> and BOTH do it...
>
> I can duplicate it using different antennas, power supplys, mic's, In
> my car...
> It does it every where and since it does it on both radios... I am led
> to believe that is actually a radio problem...
> What to do?
>
> T.
>
>
> >>> "Alan K. Adamson" <ne1h@tornado.ne1h.radio.org> 11/01/97 01:42PM
> >>>
> I sent this the author, and then realized that there may be others
> that are
> curious.
>
> Alan
> -----Original Message-----
> From: Alan K. Adamson <ne1h@ne1h.radio.org>
> To: Thomas Johnson <ThomasJ@shbank.com>
> Date: Saturday, November 01, 1997 2:41 PM
> Subject: Re: [Yaesu] FT 8100 Feed back probs
>
>
> >None on mine. I did the following.
> >
> >Tuned up 147.075 (local repeater) on the left side, left the volume
> about
> >10:00 oclock. Tuned up the same freq on the right side, and set the
> volume
> >at 12:00. Then tuned the left to another 2mtr freq and then listened
> to
> the
> >activity on the repeater on the right side. No feedback. I did
> notice
> that
> >when listening to the same freq on both side, there is a little
> interaction
> >between the volume levels, but no feedback.
> >
> >I'll tell you there, are 3 problems that I know about on this radio.
> >
> >I have the service bulletin on one of them, and for some reason Yaesu
> will
> >not give out the bulletins on the others even thought they know they
> exist!
> >
> >1) Poor deviation on xband repeat (the one that I have)
> >2) Radio Hears inself on the 2mtr side when transmitting on 440!
> >3) The radio will get stuck in TX mode and you have to move the mic
> around
> >to get it unstuck. Has to do with RF getting back into the radio and
> there
> >is a fix, but Yaesu won't release it. I'm really frustrated with
> this last
> >one, and Yaesu's poor attitude about releasing the fix. I may never
> buy
> >another Yaesu because of this.
> >
> >I'm tring to find the 800mhz mod, but no luck todate, if you know
> it's
> >whereabouts please advise. I do have the MARS/CAP mod but only
> faxable.
> >
> >Thanks,
> >Alan Adamson
> >NE1H
> >ne1h@ne1h.radio.org
> >-----Original Message-----
> >From: Thomas Johnson <ThomasJ@shbank.com>
> >To: yaesu@contesting.com <yaesu@contesting.com>
> >Date: Saturday, November 01, 1997 2:19 PM
> >Subject: [Yaesu] FT 8100 Feed back probs
> >
> >
> >>
> >>If you have an FT8100r, let me know if your radio has feed back type
> of a
> >problem...
> >>
> >>And let me know if there is a fix for this...
> >>
> >>This is what it is doing..
> >>
> >>Put The radio in VHF/VHF mode... Put first VFO (left side) on any 2
> meter
> >frequency.
> >>Put second VFO on "ANY" 2 Meter Frequency...
> >>The volume on the left can be at any volume... now turn the volume
> on the
> >right to 12:00.
> >>
> >>Now, Key up the repeater (or have someone talk on that freq) on the
> Right
> >VFO..
> >>
> >>Do you get Audio feed back??
> >>
> >>Thanks,
> >>Tom
> >>K9KJ
> >>
> >>
> >>
> >>--
> >>FAQ on WWW: http://www.qsl.net/k7on/yaesu.html
> >>Submissions: yaesu@contesting.com
> >>Administrative requests: yaesu-REQUEST@contesting.com
> >>Problems: owner-yaesu@contesting.com
> >>Search: http://www.contesting.com/km9p/search.htm
> >
>
>
> --
> FAQ on WWW: http://www.qsl.net/k7on/yaesu.html
> Submissions: yaesu@contesting.com
> Administrative requests: yaesu-REQUEST@contesting.com
> Problems: owner-yaesu@contesting.com
> Search: http://www.contesting.com/km9p/search.htm
>
> !
>
> !
>
> !
>
> !
>
> !
>
>
>
> --
> FAQ on WWW: http://www.qsl.net/k7on/yaesu.html
> Submissions: yaesu@contesting.com
> Administrative requests: yaesu-REQUEST@contesting.com
> Problems: owner-yaesu@contesting.com
> Search: http://www.contesting.com/km9p/search.htm
>
--
FAQ on WWW: http://www.qsl.net/k7on/yaesu.html
Submissions: yaesu@contesting.com
Administrative requests: yaesu-REQUEST@contesting.com
Problems: owner-yaesu@contesting.com
Search: http://www.contesting.com/km9p/search.htm