[1000mp] FT-1000mp S-Meter Service Manual and Archive Info
WD8ARZ
wd8arz at ix.netcom.com
Sat Oct 9 06:41:55 EDT 2004
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Thus many of the url's for the list and the users are no longer valid.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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