And, if you really want your s-meter readings to mean anything (you gotta be
anal to do this), calculate your antenna gain, feedline loss, tuner loss,
switch loss, etc. 599 into a 4-el beam may be the same as 569 into a wire
Dave
WA3MKB
-------------- Original message --------------
From: "Bob McGraw - K4TAX" <RMcGraw@Blomand.net>
> Interesting. In looking at the data taken from my Omni VI Plus a couple of
> years ago I find that the S meter seemed quite accurate. Feeding the
> HP8656A generator to the input of the receiver, 50 uV equals S -9 on the
> meter. Then in -6 dB steps down in level, the S-meter tracked +/- needle
> width down to S-3. Looking at levels over S-9, I noted that 50 uV +10 dB
> indicates 10 over S-9, and 20 dB over 50 uV is 20 over S-9 and 30 dB over 50
> uV the meter indicates 30 dB over S-9. This was after the S meter was
> calibrated as per the manual. The physical reading of the meter below S-3
> was noted as undecernable with regard to accuracy.
>
> I did some repair work on my Collins S-Line 75S-3B and clearly, S-9 = 100 uV
> as per the manual. I do notice that the meter scale show S-9 to be 40 on
> the DB scale with S-3 at 20 on the DB scale. The difference is 6 S units
> and 20 DB. This nets a 3.3 dB per S unit level.
>
> I seem to recall reading some history about the S unit. It was generally
> supposed to be a measurement to comply with the RST system.
>
> Still love the reports that go "ur 599 hr, please repeat your QTH and Name
> and my RST". sigh
>
> 73
> Bob, K4TAX
>
>
> ----- Original Message -----
> From: "Tony Berg"
> To: "Discussion of Ten-Tec Equipment"
> Sent: Thursday, January 10, 2008 7:59 AM
> Subject: Re: [TenTec] STANDARDISATION OF S-METER READINGS
>
>
> > In the February 2008 issue of QST, on page 36, there is a reference to
> > an internet article on this topic. The web address is not quite right.
> > It should be (I hope I get this right):
> >
> >
> www.seed-solutions.com/gregordy/Amateur%20Radio/Experimentation/SMeterBlues.htm
>
> >
> > 73, Tony W1OT
> >
> > On 1/9/08, Jim Brown K9YC wrote:
> >> On Tue, 8 Jan 2008 21:15:51 -0600, Bob McGraw - K4TAX wrote:
> >>
> >> >Fortunately most companies today do adhere to and have adopted the
> >> >50 uV for S-9 as the standard and one S unit change is 6 dB signal
> >> >change.
> >>
> >> Really? I doubt it. I own two TS850s and two FT1000MPs. I haven't
> >> measured the sensitivity of S9 (I simply didn't pay attention), but
> >> I looked at the value of an S-unit. In general, S8 to S9 is usually
> >> be 6 dB, but S7 to S8 is less, and S-units below S6 are about 3 dB
> >> on a good day. YMMV. Standard adhered to by manufacturers? Ya gotta
> >> be kidding.
> >>
> >> 73,
> >>
> >> Jim Brown K9YC
> >>
> >>
> >> _______________________________________________
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> >> TenTec@contesting.com
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> >>
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> >
>
>
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