[1000mp] Re: Mark V Field Power Output Mod
Tod - Idaho
tod at k0to.us
Fri Aug 6 10:45:59 EDT 2004
Tom:
Since you apparently have the necessary equipment to make valid tests, could
you please share with us the IMD numbers of your Field for 100,150 and 175
watts?
Tod, KØTO
> -----Original Message-----
> From: 1000mp-bounces at mailman.qth.net
> [mailto:1000mp-bounces at mailman.qth.net] On Behalf Of Thomas
> Giella KN4LF
> Sent: Friday, August 06, 2004 8:17 AM
> To: All about Yaesu 1000mp
> Subject: [1000mp] Re: Mark V Field Power Output Mod
>
> Morris et all,
>
> I used an HP8563E spectrum analyzer and some other equipment
> to measure spectral purity at 100 watts, 150 watts and then
> at 200 watts on the V Field.
>
> There was no discernable spectral purity degradation at 150
> watts and a very minimal amount of degradation at 200 watts
> and still well within FCC requirements.
>
> 73,
> Thomas F. Giella, KN4LF
> Plant City, FL, USA
> Grid Square EL87WX
> Lat & Long 27 58 31 44N 82 09 51 98W
>
> PODXS 070 PSK31 Club Member #349
>
> KN4LF Solar Space Weather & Geomagnetic Data Archive:
> http://www.kn4lf.com/kn4lf5.htm
>
> ----- Original Message -----
> From: morris wideman
> To: All about Yaesu 1000mp
> Sent: Friday, August 06, 2004 7:49 AM
> Subject: Re: [1000mp] Re: Mark V Field Power Output Mod
>
>
> Hello
> Im curious as to how you checked the spectral purity of
> your modified radio?.
> Finals that are operating at 12v not 30 are going to be
> much more likely to generate spurious emissions if they are
> overdriven.
> WA4MIT Morris
>
> ----- Original Message -----
> From: "Thomas Giella KN4LF" <kn4lf at tampabay.rr.com>
> Date: Thu, 5 Aug 2004 23:45:07 -0400
> To: "a Yaesu E-Group" <yaesu at contesting.com>,"a FT-1000MP
> eGroup" <FT-1000MP at yahoogroups.com>,"a 1000MP QTH e-List"
> <1000mp at mailman.qth.net>
> Subject: [1000mp] Re: Mark V Field Power Output Mod
>
> > My original post below has stimulated allot of
> controversy and posts. I stand by what I already said:
> >
> > .....I've tested the rig extensively at 175 watts on CW
> and RTTY and have suffered no component failures,
> overheating, etc. and no transmit spectral degradation. Of
> course like all mods. make it at your own risk.....
> >
> > I look at it this way. In the original spirit of ham
> radio I'm not afraid to open up my modern expensive rice box,
> to experiment and modify. In my original post I never
> mentioned operating my V Field at 200 watts but it did hold
> up very well with no overheating etc. at 175 watts on CW and
> RTTY, as an experiment. Why did it hold up so well? It's
> because the rig is better engineered and has better specs.
> then advertised and a certain amount of "appliance operator"
> headroom is built in.
> >
> > Am I stressing the rig? Maybe so but if it blows up I'll
> fix it and/or buy another one. One ham posted in response to
> my original post, to paraphrase, "Real Ham's understand how
> electronics work and don't turn up the power on their rig". I
> say "Real Ham's" are not afraid to experiment.
> >
> > In any event, in my day to day operations I never run my
> V Field above 125 watts. I originally tweaked up the power
> output because from the factory my V Field only put out 90
> watts on 160 meters and I needed 125 watts to drive my old
> linear to 800 watts.
> >
> > 73,
> > Thomas F. Giella, KN4LF
> > Plant City, FL, USA
> > Grid Square EL87WX
> > Lat & Long 27 58 31 44N 82 09 51 98W
> >
> > PODXS 070 PSK31 Club Member #349
> >
> > KN4LF Solar Space Weather & Geomagnetic Data Archive:
> http://www.kn4lf.com/kn4lf5.htm
> > ----- Original Message -----
> > From: Thomas Giella KN4LF
> > To: a Yaesu E-Group ; a 1000MP QTH e-List ;
> FT-1000MP at yahoogroups.com
> > Sent: Monday, August 02, 2004 6:28 PM
> > Subject: Mark V Field Power Output Mod
> >
> >
> > Justin et all,
> >
> > The Mark V Field power modification is simple but it
> will attract naysayers that will warn of power supply
> damage/failure, finals failure, degraded transmitted spectral
> purity, etc.
> >
> > Pop the top and bottom covers. Gently turn the rig
> upside down on a hard surface with the front of the rig
> facing you. There are three boards visible. One is the
> "Control" board on the left side, the "AF" board on the back
> right side and the "IF/Filter" board on the front right side.
> Go to VR3003 on the AF board and turn it clockwise. It's
> marked "RF Power" (I think it was). Fully clockwise gives you
> 190 watts in the CW mode on 14200 kc, 200 watts on 1845 kc
> and 180 watts on 28400 kc. Of course connect an antenna with
> low VSWR or a good dummy load.
> >
> > I've tested the rig extensively at 175 watts on CW and
> RTTY and have suffered no component failures, overheating,
> etc. and no transmit spectral degradation. Of course like all
> mods. make it at your own risk.
> >
> >
> >
> >
> > ---
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