----- Original Message ----- From: "Edward Cole" [email protected] To: [email protected]; "i8cvs" [email protected] Sent: Monday, September 29, 2008 4:42 PM Subject: Re: [amsat-bb] Re: Telemetry
Domenico,
Yes, thanks for providing the S+N/N as this is indeed what one reads on the s-meter. The amount of dB/S-unit varies greatly by radio (theoretically it should be 6-dB/S-unit). I find on my FT-847 that the calibration of the s-meter is anywhere from 6-db to 3-dB per unit and is non-linear. One needs to calibrate their individual radio to trully know what the s-meter is indicating. S0 to S1 on my radio is about 5-dB.
73, Ed
Hi Ed, KL7UW
I agree with you.
About the " Standardization of S-meter readings at the IARU Region 1 Conference in Miskolc-Tapolca (1978) the following recommendation was adopted :
IARU Region 1 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 1 VHF/UHF/SHF/ Committee in Dusseldorf (April 1989) the following recommendation was adopted, and later approved by the IARU Region 1 Executive Committee:
The S9 reference level for frequency bands of 144 MHz and above is -93 dBm available signal power at the receiver input.
Following the above recommendation and using an HP-8640B Signal Generator I have recalibrated the S-meter readings of my Kenwood TS-790E
Best 73" de
i8CVS Domenico