[1000mp] Re: filter identification on the mkv field

[Rick Moskovits]

Hi Mike, thanks for the comments on the analog vs digital detector. my question
is, I am confused with the explanation in the manuel on normal & narow 1 when
you don't have the optional filters instaled. you indicated with setting of
8.2-455 that 2nd if is through and 3rd if is 6khz. on nar1 setting is 2nd and
3rd if set to 2.4-2.4 khz cascaded? also what are the actual filter results with
setting 8.2 or 455? any help with clarification would be greatly appreciated-
thanks rick ve1rnm
Mike Schatzberg wrote:

> Hello Dale:
>
> If you want to check the difference between the digital product detector,
> and the analog detector in the Mark V, it can be turned on and off in menu
> 7-7.  If you select off, you will be using the analog detector.  I like to
> use the 100-3100 setting, with the digital detector on SSB.  This works very
> well for weak stations, and seems to improve the signal to noise ratio.
>
> If the band conditions permit, and you want to improve the signal to noise
> ratio further, I like to use menu 5-0, and set it to the 8.2-455 position,
> to remove the filter from the 2nd IF, and use only the 6.0 filter in the 3rd
> IF.  If you do the comparison between the two detectors as above, with the
> normal filter selection button lit, you will see a rather dramatic
> difference.  I like to use this set up generally, as it also produces the
> best fidelity with stronger SSB stations.  If the QRM becomes a problem, you
> can either push the IDBT button, and superimpose the digital filters over
> the analog positions, or push the NAR1 filter selection, and have the 2.4
> khz filters cascaded in place the single 3rd IF filter.
>
> I also have noted that the best signal to noise ratio seems to come with
> about a negative 0.180 setting in menu 8-9, r-usbcar.  This also seems to
> improve the noise floor noticeably.
>
> Regardless, later this summer, following some other projects, and despite
> some criticism that it may not work well, I intend to change all the
> switching diodes in both the preamps and front end.  I will finally find out
> what PIN diodes do, or don't do for the Mark V.
>
> As long as the new roofing filter is switchable, it certainly looks like it
> is a worthwhile change if you suffer from intermod issues.  Even out here in
> the country I have one or two signals I would like to see removed, probably
> from strong broadcast station mixes.  I also intend to enable the antenna
> tuner to work during receive when desired, to improve the Q of the front
> end.  I wonder what the reason is that Yaesu doesn't offer that option, I
> want to give it a try.
>
> Regards,
>
> Mike Schatzberg
> WB2AJI
> ----- Original Message -----
> From: "D. J." <dalej2 at mac.com>
> To: "All Things Pertaining To The 1000mp Series" <1000mp at mailman.qth.net>
> Sent: Tuesday, May 18, 2004 1:14 PM
> Subject: Re: [1000mp] MP Roofing Filter from INRAD -- hiss reduction needed?
>
> > I just tried turning of the EDSP in menu 0-9 and I could tell no
> > difference in receiver noise, the tone changed slightly but the output
> > from the speaker did not, I had a sound level meter on the speaker.
> > The antenna input was on a dummy load.  Am I doing it right?
> >
> > Also, could you provide details about disconnecting the manual notch,
> > where did you do it?
> >
> > tnx
> > Dale, K9VUJ
> >
> > On May 18, 2004, at 9:31, Harry Yingst wrote:
> >
> > > if you turn off the DSP in the Menus you should hear the hiss quite
> > > well
> > >
> > >
> > >
> > >
> > > --- Pete Smith <n4zr at contesting.com> wrote:
> > >> At 10:25 AM 5/18/2004, you wrote:
> > >>> Harry Yingst <ab2pn at yahoo.com>
> > >>
> > >>
> > >> Sorry, Harry, I don't understand -- turning *what* off?
> > >>
> > >>
> > >> 73, Pete N4ZR
> > >> The World HF Contest Station Database
> > >> was updated on April 26, 2004
> > >> 2706 contest stations at
> > >> www.pvrc.org/WCSD/WCSDsearch.htm
> > >>
> > >> _______________________________________________
> > >> 1000mp mailing list
> > >> 1000mp at mailman.qth.net
> > >> http://mailman.qth.net/mailman/listinfo/1000mp
> > >
> > >
> > > =====
> > > Harry - AB2PN
> > >
> > > -
> > >
> > >
> > >
> > >
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