Electronics > Beginners

Siglent SDG-2042x 10Mhz reference signal is bad

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radiolistener:

--- Quote from: john95 on May 16, 2019, 07:55:30 pm ---
2) if I accidentally output more power from SDG, I burn up HAM radio.

--- End quote ---

I think this signal generator is unable to burn up your radio, it's power too weak and almost equivalent to voltage from antenna near powerful transmitter. It should works ok with no overload up to 1-2 Vpp on the input.

And thanks for video with modulation mode demo.  :)

john95:
thanks for the table. it matches my calculation exactly. for 50 ohm radio impedance, it is "Power(dbm) = 20 * log(mVpp) -56 ".
SDG can damage HAM. it can output 20 V p-p. and according to your table, 448 mvps might damage it already since S meter max is S9 + 60 db.

radiolistener:

--- Quote from: john95 on May 16, 2019, 08:07:49 pm ---448 mvps might damage it already since S meter max is S9 + 60 db.

--- End quote ---

No, voltages up to 1-2 Vpp is normal. It can overload input and your S-meter will show max value, but it is not critical, because such voltage from antenna is a common case. You can apply such voltage directly to ADC with no issues. :)

You can enable internal attenuator in order to reduce signal level.

20 Vpp may be dangerous. I think this radio can survive it, but I don't recommed to apply more than 2 Vpp.

tautech:

--- Quote from: john95 on May 16, 2019, 07:35:10 pm ---Thank you very much. Someone told me that earlier. I will retest. I thought it was on 50 ohm as default, and not sure why it was changed to HiZ. Thanks again for pointing it out.

--- End quote ---
FYI the output impedance of all SDG's is only ever 50 Ohm.
When we change the output level between HiZ and 50 Ohm all we change is the max amplitude level so to match the selected/expected load impedance.
Max outputs:
HiZ = 20V p-p
50 Ohm = 10V p-p

john95:

--- Quote from: tautech on May 16, 2019, 08:23:54 pm ---
--- Quote from: john95 on May 16, 2019, 07:35:10 pm ---Thank you very much. Someone told me that earlier. I will retest. I thought it was on 50 ohm as default, and not sure why it was changed to HiZ. Thanks again for pointing it out.

--- End quote ---
FYI the output impedance of all SDG's is only ever 50 Ohm.
When we change the output level between HiZ and 50 Ohm all we change is the max amplitude level so to match the selected/expected load impedance.
Max outputs:
HiZ = 20V p-p
50 Ohm = 10V p-p

--- End quote ---

thanks. 10 Vpp will damage my HAM radio's front end.

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