[1000mp] UPGRADE BY OE3HKL

[Rick Moskovits]

Hi Mike, the company i work for employs a german national who is also a good
friend of mine. if you need this article translated he can do this. also, i
really enjoyed our qso some weeks ago and you mentioned that you had some photos
of the roofing mod that you could possibly make available. this would be great
if you can. please let me know on the translation issue-vy 73 rick ve1rnm

Mike Schatzberg wrote:

> Hello Amp Fans:
>
> I spoke with Kurt, OE3HKL, on June 21, 2005, and he is on vacation right
> now, away from home.
>
> Kurt says that he did not find an improvement in IMD following the
> installation of his new roofing filter in his Mark V Field, and he set about
> trying to discover the cause and cure.
>
> He believes from his tests that his 12 Khz factory roofing filter is
> different from those filters found in the Mark V (200 Watt) models, and that
> the intermod problem already exists by the time the signal passes thru the
> original filter.  He does not think that the problem exists within the Mark
> V radio because of all the testing done by the ARRL and the RSGB on the 200
> Watt version.
>
> Thus, it is necessary to relocate the Inrad filter to just after the first
> mixer, rather than just place it in series following the original 1st IF
> Filter.
>
> I wondered myself after thinking about this if indeed the part numbers for
> the two original filters are indeed different in the two versions of the
> Mark V?  Maybe rather than his modification, one could replace the Field's
> 1st IF filter with the one from the original Mark V, and just add the Inrad
> filter in series?  Or perhaps there is some other issue here, beyond a
> difference in filters?  Perhaps there is some difference in the quality of
> all of the 1st IF filters used by Yaesu?
>
> Kurt's article will be available only in German, and will need to be
> translated, as there is no English version at this time.
>
> His measurements following the mod are most impressive, and his modification
> does apparently improve the IMD numbers and dynamic range, following
> hundreds of experimental hours by Kurt.
>
> I hope to correspond via mail with Kurt and obtain some more information, as
> he currently does not have email capabilities.
>
> Regards,
>
> Mike Schatzberg
> WB2AJI
> ----- Original Message -----
> From: "ON4ADZ" <on4adz at pro.tiscali.be>
> To: "All about Yaesu 1000mp" <1000mp at mailman.qth.net>
> Sent: Sunday, July 03, 2005 4:52 AM
> Subject: RE: [1000mp] UPGRADE BY OE3HKL
>
> > Dear Uwe,
> >
> > With tanks !!
> > Keep me informed of your improved board.
> >
> >
> > Dirk
> >
> >
> > -----Oorspronkelijk bericht-----
> > Van: 1000mp-bounces at mailman.qth.net
> > [mailto:1000mp-bounces at mailman.qth.net]Namens Uwe Egen
> > Verzonden: zondag 3 juli 2005 9:50
> > Aan: All about Yaesu 1000mp
> > Onderwerp: RE: [1000mp] UPGRADE BY OE3HKL
> >
> >
> > Hi Dirk,
> > BTW the modification is not easy to do.
> > Mainly putting the Inrad Roofing Set direct
> > after the first mixer and decoupling it.
> > If I have time, I will make a better PCB
> > for me.
> > Will scan both issues. Wait two days.
> > 73, Uwe, DL9NC
> >
> >
> >
> > "ON4ADZ" <on4adz at pro.tiscali.be> schrieb:
> > > Dear Uwe,
> > >
> > > Can you scan the articles ?
> > >
> > >
> > > With thanks
> > >
> > > DIRK on4adz
> > >
> > > -----Oorspronkelijk bericht-----
> > > Van: 1000mp-bounces at mailman.qth.net
> > > [mailto:1000mp-bounces at mailman.qth.net]Namens Uwe Egen
> > > Verzonden: zaterdag 2 juli 2005 9:58
> > > Aan: All about Yaesu 1000mp
> > > Onderwerp: Re: [1000mp] UPGRADE BY OE3HKL
> > >
> > >
> > > "ON4ADZ" <on4adz at pro.tiscali.be> schrieb:
> > > > Dear
> > > >
> > > > In the june issue of FUNKAMATEUR is the first part of an article by
> > OE3HKL
> > > > wich describes
> > > > a modification for improve the imd performance of the Mark v receiver.
> > > > The second part will be published in july.
> > > > In this case a Field model.
> > > >
> > > > The improvement is several db added to the roofing upgrade @2khz
> > > >
> > > > Has someone more info on modification e.g. the email adres of oe3hkl ,
> > > Kurt
> > >
> > > Dirk,
> > > I own both issues of Funkamateur. May I can help you.
> > > Uwe, DL9NC
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