Re: Field test 11970 harmonic mixers
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Dave – I have done exactly what you describe with the DVM in the diode mode on the IF port. Typically, I got close to 0.77 volts in both directions. ?Going to the LO port will not work as it has a BPF in the path. 73 – Mike ? Mike B. Feher, N4FS 89 Arnold Blvd. Howell NJ 07731 908-902-3831 ?
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From: [email protected] < [email protected]> On Behalf Of Dave G8KHU Sent: Saturday, April 20, 2024 3:58 AM To: [email protected]Subject: [HP-Agilent-Keysight-equipment] Field test 11970 harmonic mixers ? Vewr occasionaly at rallies I've come across 11970 series harmaonic mixers at very good prices - assuming that they are working.....
If they are dead they are a very expensive reminder of caveat emptor :)
Is it safe to field test them with a DVM on the diode test setting measuring the IF output port (and being very careful about static discharge)?
Measuring my DVM it produces 2.3V open circuit and has a short circuit current of 0.8 mA. As the mixer maximum imput level is +20 dBm, and I believe a 4:1 impedance transfor in the waveguide input, that would equate to 100 mW into 200 Ohms giving 4.4 V rms and 22 mA rms. Just looking at the numbers it seems to me that it should be OK - BUT I'd really appreciate the input of those with more knowledge about these mixers that I have.
Dave G8KHU
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