Electronics > Beginners

Siglent SDG-2042x 10Mhz reference signal is bad

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john95:
do you have Mac or Linux version of RFCALC? or even web based? I have not used window machine for ages.

john95:
if the actual voltage reaching radio is half of what I thought. It means the power reaching HAM radio is 6 dbm (20 * log(2)) lower. it matches perfectly to the theoretical predication. Thanks. I will set to 50 ohm and retest.

radiolistener:

--- Quote from: john95 on May 16, 2019, 07:38:44 pm ---do you have Mac or Linux version of RFCALC? or even web based? I have not used window machine for ages.

--- End quote ---

it is written in C# and should run on Mac or Linux with no issues under mono.
Just install mono runtime and run it with command line:

--- Code: ---mono RFCALC.exe
--- End code ---

PS: be careful with transceiver, if you randomly press TX button on your transceiver, you can burn-out your sig gen output... ;)

john95:
correct. I should be very very careful.
1) if I transmit from my HAM radio, it damages SDG.
2) if I accidentally output more power from SDG, I burn up HAM radio.

I should test as less as possible on this setup as the potential damage is severe. especially not after couple of drinks.

If proven correct because of this HiZ issue, I will be extremely happy that I worked out formula from basic assumption.

radiolistener:
Here is some values from RFCALC:
2 mVpp = -50 dBm = S9 + 23 dB
5 mVpp = -42.04 dBm = S9 + 30.96 dB
15 mVpp = -32.5 dBm = S9 + 40 dB
45 mVpp = -22.96 dBm = S9 + 50 dB
142 mVpp = -12.98 dBm = S9 + 60 dB
448 mVpp = -2.995 dBm = S9 + 70 dB

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