Marconi/IFR/Aeroflex 2309 & 2310 - UK Vintage Radio Repair and Restoration Discussion Forum

Jon_G4MDC · 9th Apr 2024, 11:01 am

Does anyone know anything about these instruments please?

I am trying to understand the self test routine which measures IF flatness.

The block diagram shows the RF Input range to be 100MHz to 2.4GHz and there is an LO shown covering the same range. There is a single mixer to an IF of 10.7MHz

At the input selector (High/Low Power Input) there is a CAL block shown. Presumably this is a fixed frequency oscillator and IF flatness is measured using that by tuning across it with the LO.

Does anyone have any idea what is the frequency of the CAL signal? I would guess at 1GHz but it is only that - a complete guess.

Read the manual... it is 400MHz and -10dBm +/- 0.175dB

9th Apr 2024, 11:01 am	#1
Jon_G4MDC Nonode Join Date: Nov 2015 Location: Welwyn Garden City, Hertfordshire, UK. Posts: 2,015	Marconi/IFR/Aeroflex 2309 & 2310 Does anyone know anything about these instruments please? I am trying to understand the self test routine which measures IF flatness. The block diagram shows the RF Input range to be 100MHz to 2.4GHz and there is an LO shown covering the same range. There is a single mixer to an IF of 10.7MHz At the input selector (High/Low Power Input) there is a CAL block shown. Presumably this is a fixed frequency oscillator and IF flatness is measured using that by tuning across it with the LO. Does anyone have any idea what is the frequency of the CAL signal? I would guess at 1GHz but it is only that - a complete guess. Read the manual... it is 400MHz and -10dBm +/- 0.175dB Last edited by Jon_G4MDC; 9th Apr 2024 at 11:15 am. Reason: answered own question!