Electronics > Repair
Aeroflex IFR-2398 / calibration / repair help
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vanderleySCL:
Hello everybody,
My IFR 2398 has a problem on the RF input board, specifically the capacitor C1 is leaking, I couldn't get an electrical schematic to check its capacitance, does anyone know how to tell me the value of this capacitor?
vanderleySCL:
I installed a 10N capacitor (103) while not finding the correct value and it seems to work fine. But I still have another problem which is an error in LOG calibration. This problem seems to be in the attenuator because the REF LEVEL when above 10Dbm as measurements are correct but if I change to 9.9DBM (or any value below 10DBM) as measurements are incorrect, the signal a drastic reduction. If anyone has the attenuator schematic and can share it with me.

George Edmonds:
Hi

C1 is a 1mfd none polar capacitor 25vdc working.

I posted the schematic of the attenuator previously, look back at my earlier postings.

Looks like this 2398 has had a DC input overload.

G Edmonds
vanderleySCL:
Thank you very much Edmonds, I will provide the correct value of the capacitor, you are right, it suffered an overload on the input, the error problem in the Log I was able to identify, it is a 20DB attenuator relay that is damaged (Teledyne a150-20-12) , I made an external attenuator just to test and it passes the self test, now I need to buy this relay. Very grateful for the support.
EB4CUV:
Hi George

I bought an IFR 2398 with a fault and I'm seeing that the input step is blown. In a previous message you said that you had posted the schematic of this input board but I can't find it. Could you send it again or tell me where to find it?

Thanks, Julio.
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