Hello
I upgraded to protocol 2 (V3.9 - 12.1.18) on my Anan 100D and I use version 2.10.3.4 (10/19/23) of Tethis.
I wanted to carry out the calibration using the MW0LGE tutorial:
https://www.youtube.com/watch?v=yuZK9iToNxg
I used an RF generator: https://www.youtube.com/watch?v=gBbCwW__Z6c
I set the generator to 15mhz at -72dbm and started the calibration.
Result: I find the -72dbm (blob measurement spectrum)
and on the meter I find myself reading -72dbm S9.
Once the hf generator is "off", antenna cable unplugged I can read on the VU meter -102dbm (+-) with a signal of 4 (+-), whereas I should normally have a level close to 0
I tested the Anan 100D on SDR Console, I found myself having a signal of 9+2 for -72dbm and when I disconnected the cable from the HF generator, I found myself having a value close to 0
Are we facing a calibration problem on Tethis or is it me who is not doing the right thing?
Thank's,73,
Thierry
Problem Calibation Level Cal on ANAN100D..
Re: Problem Calibation Level Cal on ANAN100D..
Thierry wrote:Hello
I upgraded to protocol 2 (V3.9 - 12.1.18) on my Anan 100D and I use version 2.10.3.4 (10/19/23) of Tethis.
Thetis
I used an RF generator: https://www.youtube.com/watch?v=gBbCwW__Z6c
I saw a nice review of that signal generator on Youtube and it was surprisingly accurate, so the generator looks OK to use.
I set the generator to 15mhz at -72dbm and started the calibration.
Result: I find the -72dbm (blob measurement spectrum)
and on the meter I find myself reading -72dbm S9.
Once the hf generator is "off", antenna cable unplugged I can read on the VU meter
Do you mean S-meter?
-102dbm (+-) with a signal of 4 (+-), whereas I should normally have a level close to 0
We don't need the S units, just the dBm value.
Depending on the bandwidth of your receive passband, -102dBm on the S-meter is just about what you would expect. So that is correct, and there is no problem.
For example, my ANAN-8000 is calibrated properly. Switching to a dummy load at 14.3MHz, in USB with a receive passband of 2.7KHz (100 to 2800Hz), I get an S-meter reading of -106dBm. This is equivalent to a noise power spectral density of -140dBm/Hz, and when I look at the info line below the spectral display it in fact reads NPSD -139.7dBm/Hz (you may have to click on that line to get it to show NPSD. That you are measuring a few dB higher is unsurprising given that you are not terminating the input, that the 100D is just a little noisier than the 8000, and that between the two of us there's probably a 2 or 3 dB margin for error.
In summary, bandwidth matters when making noise measurements. See also viewtopic.php?f=6&t=2463
Re: Problem Calibation Level Cal on ANAN100D..
Hello,
Do you mean S-meter?
> yes
Many thanks Scott for all these explanations.
I took the time to read all your comments and tutorials which are very explanatory and very detailed.
Thanks again,
73,
Thierry
Do you mean S-meter?
> yes
Many thanks Scott for all these explanations.
I took the time to read all your comments and tutorials which are very explanatory and very detailed.
Thanks again,
73,
Thierry
Re: Problem Calibation Level Cal on ANAN100D..
Scott,
This reminds me that I will need to recalibrate for level now that I am using a later version of Thetis, correct?
Juha
This reminds me that I will need to recalibrate for level now that I am using a later version of Thetis, correct?
Juha
PC: 8 Core i7-10700 CPU @ 2.90GHz, NVMe SK Hynix 512 GB SSD, 32GB RAM
Windows 10 Home, Version 22H2
Thetis v2.10.4.3 x64
Protocol 2 v2.2.2
Windows 10 Home, Version 22H2
Thetis v2.10.4.3 x64
Protocol 2 v2.2.2
Re: Problem Calibation Level Cal on ANAN100D..
If you didn't start a new database the calibration will still be good.