S meter readings 32 or 64 bit versions

[GW4NNO]

I am using Thetis v2.8.8 with Windows 10 and Anan 7000DLE mark II. I have both the 32 and 64 bit versions of Thetis installed. Strangely, I seem to be getting S meter readings about 4db higher in the 64 bit version than I do in the 32 bit version. Signals actually sound louder too and appear stronger on the spectrum display. Is there some signal strength calibration difference between the two versions? and how do I know which version is giving the correct signal level of 50 micro volts for S 9 at -73dbm. I used my Metrovna antenna analyser is an rf signal generator to proide a stable signal so I know the difference is not due to on air signal variations. Any comments welcome.

[GW4NNO]

Just noticed that there is a level calibration facility on the Calibrate screen so I presume the levels between my two versions are not calibrated at the same level. I have never altered this setting in either version so maybe the defaults are not equal. I presume therefore that I'd need an RF signal generator with calibrated output level to be abloe to adjust this setting correctly.

[w-u-2-o]

That's an interesting report. I will compare both versions here when I get a chance later today.

[Tony EI7BMB]

not seeing any difference here so far

[GW4NNO]

Okay thanks for that, it must just be something in my setup then. Maybe the level calibration has been changed in one or other of my database files.

[w-u-2-o]

Without getting out my signal generator I can't detect any differences.

[AG5CK]

I checked my 7000 dle mk2 against my signal generator over the weekend. I am using the 64 bit version of 2.8.7. I don't know that the sig gen is calibrated but it matched the S meter on the anan from -10 dbm until I got down to -120 dbm. At -120 and -130 it was only 1 point off. Since the anan and HP 8640B agree I will assume it's accurate.

Then I checked my Yaesu ftdx1200. At -73 dbm on the sig gen it was reading around S7. Turning on the preamp brought the reading close to S9. I it's hard for me get used to an accurate S meter when I've been fooled for years.

[w-u-2-o]

Then I checked my Yaesu ftdx1200. At -73 dbm on the sig gen it was reading around S7. Turning on the preamp brought the reading close to S9. I it's hard for me get used to an accurate S meter when I've been fooled for years.

Oh, so true! Ha ha!

See the discussion on S-meter accuracy in this topic: viewtopic.php?f=6&t=2463