[1000mp] Fw: audio distortion with amplifier.

[Marc Wullaert]

Peter,
i!m remebering when contesting at Lier OTxA station and at home I used
also the mfj voice keyer and goth rf picking up via the mfj.I modified
the microcables inside with short wire beads (in onze taal varkensneusje
genoemd)
these are small beads where you can pull a wire tru.Also on all connections
some 0.1 uf capacititor
to the earth.This helped for me.

About the 1000mp dc version ,I have one also and I have also bad noise in
the mon.The first moment
off PTT'ing make a "CLACK" noise .I think it is coming from the long wire
running to the ps under my desk!
If I lower the power to 10-20watts all is ok.Pse see last page in the manual
!!

IF someone have a Yaesu ft1000mp on sale .I'm looking for a second one to
start some Multisingle and SO2R at my
home.

73

Marc ON4MA

----- Original Message -----
From: "Peter" <deypet at pandora.be>
To: "All about Yaesu 1000mp" <1000mp at mailman.qth.net>
Sent: Friday, October 29, 2004 10:40 PM
Subject: Re: [1000mp] Fw: audio distortion with amplifier.


> Hi all,
>
> thanks already for the fine comments.....
>
> one idea being picked up trough my microphone cables is possible,
> i'm using a mfj-voice 432 between microphone MD-100.
> But i placed already several clamps on my microphone cables.
> 3pieces on the cable going into the rig,and 3pieces on the
> microcable going into the mfj voice keyer.
> I will do some tests with just my handmike.
>
> The other idea only picked up with the monitoring system,
> sounds also fair to me.....i will test it out in the cqww.
> As i said before i'm using my amplifier very occasionally.....
>
> It's certainly not band related,as we know the diffuculties with mostly
> 1000mp's occur on 21mhz.....
>
>
> Thanks for the input,gd test,73's Peter ON7BJ.
>
>
> ----- Original Message -----
> From: "Mike Schatzberg" <cherokeehillfarm at earthlink.net>
> To: "All about Yaesu 1000mp" <1000mp at mailman.qth.net>
> Sent: Friday, October 29, 2004 7:43 PM
> Subject: Re: [1000mp] Fw: audio distortion with amplifier.
>
>
> > Hello Peter:
> >
> > Some things need to be checked first, before you go further with your MP
> > changes.
> >
> > Carefully check your signal with another station rather than thru your
> > monitor.  Very often RF is picked up on the headphone cables themselves,
> or
> > the speaker leads coming to the speaker, such as the SP-8 console, and
you
> > will think that your radio is distorted.
> >
> > In fact, your signal is not distorted, just your monitoring of the
signal
> > internally is overloaded with RF.
> >
> > Sometimes wrapping the headphone cable four or five times thru a larger
> > ferrite block will remove most of the distortion, or likewise for the
> > speaker leads.  Sometimes an inline RF choke may be necessary, depending
> on
> > the problem's severity.
> >
> > Check that the problem isn't the monitor system itself.
> >
> > Good luck, and happy DXing,
> >
> > Mike Schatzberg
> > WB2AJI
> > ----- Original Message -----
> > From: "Peter" <deypet at pandora.be>
> > To: <1000mp at mailman.qth.net>
> > Sent: Friday, October 29, 2004 11:42 AM
> > Subject: [1000mp] Fw: audio distortion with amplifier.
> >
> >
> >
> >
> > Hi there,
> >
> > my setup is a FT-1000mp DC (from 1996) with an Ameritron AL-80B.
> > In a special occasion i'm using my amplifier,perhaps once or twice in
year
> > mostly in a contest.....
> >
> > I'm still suffering from probably RF feedback in to 1000mp.
> > When monitoring in SSB the audio is distorted.
> > it's difficult to explain,it's like sqeezing my audio with ups and
downs.
> > Even in CW there's a raw tone on my signal.
> >
> > Running my 1000mp barefoot everething is excellent,but with the amplfier
> > on,it's increasing as the output power increases,the higher ALC level
the
> > more
> > distorted,even on 200w out it occurs.
> > I'm not overdriving the amplifier mostly the rig output is around 30-50w
> > controlled with the ALC on the amp.
> >
> > I grounded amp and radio seperately,so no ground loops.
> > I put the 12V-dc cable several times through a large Amidon core.
> > The ALC and PTT cable,also several times through a Ami. core.
> > Ferrite clip on beads at the back with my cw key input.
> > Coax feed used also several ferrite clamps and also a line isolator,
> > between my coax doesn't helped at all.
> > Every bead en and core is closest  placed to my chassisrig.
> >
> > Has somebody any idea or experience through which way the RF
> > is getting in my rig.(coax,12V-dc cable,ALC-PTT calbe....??).
> > So in can focus my self  on one item......???
> >
> > Any suggestions or experencies very mutch welcome.
> >
> >
> > Kind regards,73's Peter ON7BJ.
> >
> >
> >
> >
> > _______________________________________________
> > 1000mp mailing list
> > 1000mp at mailman.qth.net
> > http://mailman.qth.net/mailman/listinfo/1000mp
> >
> > _______________________________________________
> > 1000mp mailing list
> > 1000mp at mailman.qth.net
> > http://mailman.qth.net/mailman/listinfo/1000mp
> >
> >
>
>
> _______________________________________________
> 1000mp mailing list
> 1000mp at mailman.qth.net
> http://mailman.qth.net/mailman/listinfo/1000mp
>