It would be easier just to dump the 6db per S unit scale and do what the professionals do, that is use the DbUV scale. You could then have readings in precise 3db steps. Most new military receivers are now calibrated in DbuV.
However with the advent of new generation of Software Defined radios like Flexradio 5000, you can have 1db accuracy on your S meter. The RFSPACE SDR14 likewise allows for accurate level readings. I believe the Omni 7 also has an calibrated S meter. Collins confused things by specifying 100 uv for S9, however that was open circuit voltage not across 50 ohms which was later adopted by the IARU. There is still some confusion today about the 100 microvolt versus the 50 microvolt level. Kenwood specifies 100 microvolts for S 9 and others 50uv. We should just dump all these innacurate methods and get inline with commercial practice. Once your S meter is caibrated in DbUV it would be easy to have an alternate scale in S units thats both reliable and accurate. However since the K3 was the last great hope in innovative analogue engineering, we just have to accept that its S meter is not calibrated. Craig VK3HE --- rrkrr <[EMAIL PROTECTED]> wrote: > I've heard the 6dB per S unit figure in > conversations for years, but > I've never seen it written in any authoritative > source. However, I note > that Collins receivers from the 50s and 60s, having > S meters marked in > both dB and S units, seem to indicate that 3 S units > = 10 dB, equivalent > to a nice round 3.33 dB per S unit. > > Bob K4ERR > > Ken Kopp wrote: > > In my 56 years of hamming I've always thought the > "standard" was/is > > 6 db, but I can't site anything support this. > > > > We Yanks have always resisted the "world order" > when it comes to > > measurements ..... Lessee, the last I knew it was > just us and Libya > > holding out ... > > > > 73! Ken Kopp - K0PP > > [EMAIL PROTECTED] > > > > _______________________________________________ > > Elecraft mailing list > > Post to: Elecraft@mailman.qth.net > > You must be a subscriber to post to the list. > > Subscriber Info (Addr. Change, sub, unsub etc.): > > http://mailman.qth.net/mailman/listinfo/elecraft > > > Help: http://mailman.qth.net/subscribers.htm > > Elecraft web page: http://www.elecraft.com > > > > _______________________________________________ > Elecraft mailing list > Post to: Elecraft@mailman.qth.net > You must be a subscriber to post to the list. > Subscriber Info (Addr. Change, sub, unsub etc.): > http://mailman.qth.net/mailman/listinfo/elecraft > > > Help: http://mailman.qth.net/subscribers.htm > Elecraft web page: http://www.elecraft.com > ____________________________________________________________________________________Take the Internet to Go: Yahoo!Go puts the Internet in your pocket: mail, news, photos & more. http://mobile.yahoo.com/go?refer=1GNXIC _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
