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IFR COM120B Manual Service

This forum exists for the purposes for discussing service monitors (This includes but is not limited to Motorola, HP, Aeroflex, GD, etc). Additional topics allowed include test procedures, interpretation of test results, where to find information about specific tests, antenna VSWR, return loss testing, duplexer and filter alignment, etc.

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Audiotron
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Joined: Wed Apr 05, 2017 5:51 am

IFR COM120B Manual Service

Postby Audiotron » Wed Apr 05, 2017 6:28 am

Hello friends

Would anyone have the Aeroflex IFR COM120B Service Diagram or Service Manual?
I have a problem drive on the RF Generator, not generating level at the output. Some

Thank you all and a great day to all of you.

Audiotron
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Posts: 43
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Re: IFR COM120B Manual Service

Postby Audiotron » Fri Apr 07, 2017 5:04 am

Hi ,

Would anyone know the Part Number of the transistors used in the RF output of the generator function.

Thank you for All

Audiotron
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Joined: Wed Apr 05, 2017 5:51 am

Re: IFR COM120B Manual Service

Postby Audiotron » Fri Apr 07, 2017 7:47 am

Hi ,

From what I analyzed one of the transistors seems to me to be the MAR-8 MMIC of 50 Ohms the other I am in doubt.

Hugs for all

Audiotron
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Re: IFR COM120B Manual Service

Postby Audiotron » Tue Apr 11, 2017 8:04 am

Hi for All ,

Any ideas, anyone have any RF part diagram of 120B .

lc4600
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Re: IFR COM120B Manual Service

Postby lc4600 » Thu Apr 13, 2017 8:59 am

Q1 (alc amp) to U1(1na10386) to U11(MSA1105) to 8dBpad to J2 on block -8dBm output to Attenuator
Carl N0PXJ

Audiotron
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Re: IFR COM120B Manual Service

Postby Audiotron » Sun Apr 16, 2017 1:21 pm

Thank you Carl,
I have already ordered the transistors as soon as they arrive, as a result of the operation,

Thank you very much.

Audiotron
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Joined: Wed Apr 05, 2017 5:51 am

Re: IFR COM120B Manual Service

Postby Audiotron » Wed Nov 15, 2017 2:45 pm

Hi ,

Sorry for the delay in return, The problem was really in the last MMIC amplifier (INA10386) of the unit OUTPUT GEN ....thank you Carl N0PXJ


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