[1000mp] Re: FT-1000mp S-Meter Service Manual and Archive Info
RCARIELLO
RCARIELLO at si.rr.com
Sat Oct 9 07:44:48 EDT 2004
Bill,
A really big thanks for your help.
See you in the pile-ups.
Rich AA2MF
----- Original Message -----
From: "WD8ARZ" <wd8arz at ix.netcom.com>
To: <1000mp at mailman.qth.net>
Cc: <RCARIELLO at si.rr.com>
Sent: Saturday, October 09, 2004 10:41 AM
Subject: FT-1000mp S-Meter Service Manual and Archive Info
> Please note that the following post's from past 1000mp archives are old.
> Thus many of the url's for the list and the users are no longer valid. I
> have left them there for nostalgic reasons I guess.... hi hi
>
> In essence, the S meter issue generated a lot of good traffic.
>
> To specifically answer your question on zeroing the S Meter Rich, the
> FT-1000MP Service Manual (Copyright 1995 E03939000 9508C-0Y release)
> details the following:
>
> Page 3-1
> A 50 ohm dummy load and in-line wattmeter must be connected to the antenna
> jack in all procedures that call for transmission, expect where specified
> otherwise. Correct alignment is not possible with an antenna. Except where
> specified otherwise, the transceiver should be tuned to 14.2000 MHz, USB
> mode, and these controls set as indicated: MOX, VOX, AGC, PROC, IPO, ATT
all
> off. MIC & RF POWER fully CCW (minimum). AF as required. SQL fully CCW
> (minimum). NOTCH & SHIFT to 12-o'clock.
>
> Note: Signal levels in dB referred to in alignment are based on 0
> dBu=0.5uv.
>
> Sections between 3-1 and 3-7 did peaking adjustments for RF and IF stages
> using the S Meter and setting some S meter read points. That is lengthy
and
> detailed. Would recommend having the Service Manual so nothing is missed
or
> mis-understood for that material
>
> Page 3-7 S-Meter Coarse Alignment
> Preset VR20003 fully counter-clockwise, and adjust VR20003 so that all
> S-meter segments are just off. Preset the RF GAIN control fully
> counter-clockwise, and adjust VR2002 so that all S-meter segments are just
> on.
>
> Adjustments are on the IF Unit.
> VR2002 S-Meter Full Scale Adj
> VR2003 S-Meter (no other description provided)
>
> It would seem that this "set's up" the zeroing your asking about for non
FM
> S-meter adjustments.
>
> I suspect this topic will generate a flurry of interesting contributions,
> and I am looking forward to following them. Unfortunately with my long
> working hours, I don't have time to contribute to this group at the level
I
> used to years ago. Hopefully many others will continue the thread and work
> out the details as needed. It became obvious a long time ago that it is
> unfortunate that the S-meters between the two receivers in the 1000 series
> do not track each other for a variety of reasons, and the S meter values
do
> not track well from S value to S value on the same rig, much less compared
> to multiple rigs.
>
> Good Luck.
>
> 73 to all from Bill - WD8ARZ
>
> =========================
>
> ----- Original Message -----
> From: "WD8ARZ" <wd8arz at null.net>
> To: <1000mp-list at jehosophat.com>
> Sent: Sunday, November 09, 1997 12:49 PM
> Subject: [1000MP] FT-1000MP S-meter Service Manual Info
>
> After reviewing the FT1000MP Service manual, I can provide the following
> information about what Yaesu calibration procedure directs.
>
> On page 3-1 in a note it says: Signal levels in dB referred to in
alignment
> are based on 0 dBu=0.5uv.
>
> On page 3-8 it says for S-meter full scale: Connect the RF signal
generator
> to the antenna jack, and inject a +100dBu signal. Tune for peak indication
> on the S-meter. Adjust VR2002 for S9+60dB on the S-meter.
>
> There are earlier steps for setting the S-meter segments to just being
off,
> and just being full scale for minimum and maximum settings of the rf gain
> control. Rf and if stages have also been calibrated prior to the S-meter.
>
> If this information is valid (main manual is dated august of 95, but I am
> sure some updates have occured on some of the pages), then unless I am
> missing something, full scale is 100dB for +60dB over S9.
>
> With just a 40 foot peice of wire, I have seen +60dB over S9 on some
> shortware stations. Such as on 5.070 Mhz out of Nashville Tn. If a
FT1000MP
> is always reading too low on the S-meter, and there is not a rig problem,
> then it needs to be calabrated. Also note that some of the calibration for
> this radio is part of the hidden 9-x menu options. Making changes to those
> settings will affect calibration and must be done correctly with elaborate
> calibrated test equipment.
>
> Band noise on 80 meters most nights routinely hold the s-meter over S9. If
> anything on my rig, I find the receivers to be hot and quite often have
the
> IPO off and a attenuater value switched in. (this improves audio quality
on
> strong signals and the signal to noise ratio)
>
> Hope this helps.
>
> 73 from Bill Stamps - WD8ARZ
>
> ----- Original Message -----
> From: "Morel Grunberg" <morel.grunberg at telrad.co.il>
> To: <1000mp-list at jehosophat.com>; "'WD8ARZ'" <wd8arz at null.net>
> Sent: Monday, November 10, 1997 12:24 AM
> Subject: RE: [1000MP] FT-1000MP S-meter Service Manual Info
>
> Bill,
> Many thanks for reply and info.
> Anyway, it must be a mistake: 50uV is needed for an
> S-9 reading and not S-9 +60. The old service manual I saw
> used 250uV for S-9 reading.
>
> 73 de Morel, 4X1AD
>
> ----- Original Message -----
> From: "Joe Oliver" <joliver at northlink.com>
> To: <1000mp-list at jehosophat.com>
> Sent: Tuesday, November 11, 1997 7:45 PM
> Subject: [1000MP] S-Meter Calibration
>
> April 1996 issue of QST- Product Review on the Yaesu FT-1000MP showed
> an S9 signal at 14 MHz, with the preamp on, to be 100uV. Up until
> now, I have been using that information as a guide. Thanks to the
> discussion on this List I realize that 50 uV should be the required
> voltage for an S9 signal.
>
> Joe Oliver AC6AA
>
> ----- Original Message -----
> From: "VR97BrettGraham" <vr2bg at harts.org.hk>
> To: <yaesu at contesting.com>; <1000mp-list at jehosophat.com>
> Sent: Wednesday, November 12, 1997 1:32 AM
> Subject: Re: [Yaesu] FT-1000(X) S-meter calibration
>
> At 16:21 97.11.10 +0100, YT1ZKB asked:
>
> > Could someone please explain this ????
> >It is my job to know things about dBu, dBm, uV, etc, but this conversion
> >is totally unclear to me!
> >
> >Isn't it dBu = 20log(U/1uV) ?
> >where:
> >U is expressed in volts,
> >1uV is what it looks like it is:) and
> >'log' is a base ten logarythm.
> >
> >So, 50uV/1uV = 50 -> 20log(50) = 33.979dBuV
> >And +40dBuV would be: 10^(40dBuV/20)*(1uV) = 10^2 = 100uV
> >If you write it down on paper it's much more clear.
> >And for power it's dBmW = 10log(P/1mW)
> >
> >Hmm...unless you mean dBuW when you say dBu ? (which almost sure doesn't
> >fit into my definition, too :)
>
> I don't recall, but I think somebody had previously posted to 1000MP what
> Yaesu calls a dBu - I think it was something other than a dBuV & then
> somebody else then showed how this equates to something we can all relate
> to.
>
> Quite simply, a dBu is a dBu, not a dBuV. As well all know, a dB is an
> expression of the relationship between two numbers. In order to be
> specific, it must to referred to something & if that reference is not
> given, then one can only guess.
>
> Personally, RF means power & power means watts, not volts. At work, I
even
> go out of my way to talk watts, even when crossing over to a 75-ohm
> environment where voltage seems to dominate, just to keep folks on their
> toes (or to be obnoxious, according to some).
>
> Now would anyone like to take a stab at why manufacturers give sensitivity
> figures in voltage but noise floor, minimum discernable signal & others in
> power?
>
> 73, VR97BrettGraham
>
> ----- Original Message -----
> From: <Rainer.Arndt at era.ericsson.se>
> To: <yaesu at contesting.com>
> Sent: Friday, January 23, 1998 10:29 AM
> Subject: [Yaesu] FT-1000MP S-METER ACCURACY
>
> Having become inspired by a friend who just claimed that he finally
> managed to get good accuracy on the S-meter of his FT-1000, I started to
> look into this problem on my 1000MP. My observation so far had been that
> the main receiver S-meter seems to show too low values, whilst the
> subreceiver seems to be more realistic.
> So, armed with my radio measurement equipment (Stabilock 4040) and the
> service manual I yesterday started to look into this. And here's what I
> found:
>
> Stipulated Values S-meter RX 1
> RX2
>
> S-units Level in microvolts
> =================================================
> 1 0.2 No deflection
> No deflection
> 2 0.4 "
> "
> 3 0.8 One LCD bar "
> 4 1.6 "
> "
> 5 3.1 S 3+
> S 4
> 6 6.3 S 5+
> S 6
> 7 12.5 S 7
> S 7
> 8 25 S 8
> S 8
> 9 50 S 9
> S 9
> 9+10 150 S 9 + 10 S
> 9+10
> 9+20 450 S 9+25 S 9
> +15
> 9+30 1350 S 9+35 S
> 9+25
> 9+40 4050 S 9+50 S
> 9+45
> 9+50 12150 S9+60 S
> 9+50
> 9+60 35450 Full deflection Full
> deflection
>
> My initial comment is that for a radio of that price and dignity one
> would expect a far better accuracy. Am I wrong?
> I VERY MUCH WOULD LIKE TO HEAR FROM SOMEBODY WHO HAS A SIMILAR
> EXPERIENCE.
> Regards
> Rainer SM5LBR
>
> ----- Original Message -----
> From: "RCARIELLO" <RCARIELLO at si.rr.com>
> To: <1000mp at mailman.qth.net>
> Sent: Friday, October 08, 2004 4:42 AM
> Subject: [1000mp] Yaesu FT-1000mp S-Meter adjustment
>
>
> > Hello to all,
> > I do not have the service manual for my FT-1000mp.
> > The S-Meter will not Zero out.
> > With the antenna disconnected I get an S-1.5 reading.
> >
> > Meter readings seem to be correct when compared to my second FT-1000mp.
> > The
> > problem seems to be limited to the not Zeroing out.
> >
> > Anyone have the solution?
> >
> > Rich AA2MF
>
>
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