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R: For those with TS2000's - calibrated S-Meters NOW for IC-910



Hi  all,

For the standardization of  S-meter readings at the IARU Region I
 Conference in Miskolc-Tapolca (1978) the following recommendation
 was adopted:

      IARU Region I adopts as a provisional standard the value of 6 dB for
      the "S-point" ,and this value will be recommended to manufacturers
      of equipment.

At the meeting of the IARU Region I VHF/UHF/SHF Committee in Dusseldorf
(April 1983)  the following recommendation was adopted,and later approved by
the IARU Region I  Executive Committee:

      The  S9  reference level for frequency bands above 144 MHz is  -93 dBm
      available signal power at the receiver input.

73 de i8CVS Domenico


----- Original Message -----
From: Brett Dawson <brettdawson@primus.com.au>
To: Adamson, Alan <Alan.Adamson@BellSouth.com>; 'amsat-bb@amsat.org'
<amsat-bb@AMSAT.Org>
Sent: Tuesday, May 22, 2001 11:55 PM
Subject: Re: [amsat-bb] For those with TS2000's - calibrated S-Meters NOW
for IC-910


> For those interested, I have calibrated my IC-910 in a simialr way.  What
> follows is a rough first pass, and as you can see I was working in
multiples
> of 5dB, and recording what S-point corresponded, not the other way.  I
will
> repeat and post the results.
>
> 2m
>
> -115dBm -> S0
> -110dBm -> S1
> -105dBm -> S3
> -100dBm -> S5
>  -95 dBm -> S7
>
> Regards
>
> Brett, VK2CBD
> -----Original Message-----
> From: Adamson, Alan <Alan.Adamson@BellSouth.com>
> To: 'amsat-bb@amsat.org' <amsat-bb@AMSAT.Org>
> Date: Wednesday, 23 May 2001 02:47
> Subject: [amsat-bb] For those with TS2000's - calibrated S-Meters
>
>
> >All,
> >
> >I hooked up the HP8920A to my TS2000 and calibrated it's S-Meter...
> Actually I have two of them... a regular 2000 and a 2000X that I just
picked
> up at Dayton.
> >
> >Here was the results of both the S-Meter and the RX NF (the S-Meter test
> was done with a 1khz tone in SSB and the filters set to 300/2400, freq on
> this test was 433.350).  This is not a sensitivity test... I'll give you
> that below.  I'll try to do a 145mhz test as well to see if anything
> changes.
> >
> >S-Meter
> >Nothing on the meter (next increment of signal will give an S0 reading)
> >-116dBm
> >S0
> >-115dBm
> >S1
> >-113dBm
> >S3
> >-110dBm
> >S5
> >-107dBm
> >S7
> >-102dBm
> >S9
> >-93dBm
> >
> >I also did a NF test... I generated a 1khz tone with the filters as set
> above.  For a 10db SN, I got the following
> >-130dBm
> >
> >so do the math.
> >-130-10=-140 (the 10 comes from the 10db SN
> >-140-30=-170 (the 30 comes from 10*log(1000))
> >-170+174=4.  I'd say that is a +-1 value.
> >
> >So for the 2000, looks like a  5 for the NF and a bandwidth of 2100.  One
> note, I cranked in the cw filters and shut it down to 50hz (yes you can do
> that on the 2000).  Needless to say, I couldn't generate a low enough
signal
> to test this and I didn't have an external attenuator.  My HP only goes
down
> to -136dBm and I still had too much SN in this setting :-/.  One final
note,
> the 2000 uses IF DSP and it may artificially effect the NF to the good....
> Either way, that little sucker is pretty impressive.... assuming I did the
> tests right :).
> >
> >Alan
> >
> >----
> >Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
> >To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org
>
> ----
> Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
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>





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