Eric,
I am confused.
I used my SMA 35-4400MHz device with my software and generated & measured the following signals:
Generated -> Measured
200 MHz -> 199.955 MHz
300 MHz -> 299.997 MHz
400 MHz -> 399.955 MHz
800 MHz -> 799.955 MHz
?
?1 GHz ->? 1.00000 GHz
?2 GHz ->? 2.00000 GHz
?3 GHz ->? 3.00001 GHz
?4 GHz ->? 4.00000 GHz
?
Using 3rd harmonic:
?5 GHz ->? 5.00000 GHz
?6 GHz ->? 6.00000 GHz
?7 GHz ->? 7.00000 GHz
?8 GHz ->? 8.00000 GHz
?9 GHz ->? 9.00000 GHz
10 GHz -> 10.00000 GHz
11 GHz -> 11.00000 GHz
12 GHz -> 12.00000 GHz
Measurements are on spot.
But then I measured the SGS 101 again and it is off as before.
Intreagued, I used a different field meter to measure the frequency of the signal generated by the SGS 101. Here a picture of a very narrow span, showing the type of signal the SGS 101 generates:
As in the previous measurement with the other field meter, the signal is only slightly off and I think it is due to the age of the SGS 101.
Then I measured a signal generated with my SMA 35-4440MHz device at 11.500 GHz:
The field meter measured 11.499GHz. Pretty accurate, at least for my purposes.
Again, note that these measurements on my field meters went through an LNB for downconversion from Ku-band into L-band.
At this point, I don't know why the TinySA Ultra has such a big frequency deviation when measuring the signal of the SGS 101, while measuring other signals perfectly fine.Can it be that the modulation of the signal from the SGS 101 causes the strange behaviour on the TinySA Ultra?
I noted some other inconsistencies when using huge spans like 4GHz to 12GHz. It seems the auto-level function or similar kicks in and doesn't work correctly. But right now, I assume this is probably me doning something wrong. I have had little to no time experimenting with the TinySA Ultra.
Kind regards,
Vitor
