Search found 19 matches

by giancom120b
Fri Aug 23, 2019 9:22 am
Forum: Test Equipment & RF Equipment Alignment
Topic: IFR AEROFLEX 2975 Generator problem mmic H1 ?
Replies: 9
Views: 8921

Re: IFR AEROFLEX 2975 Generator problem mmic H1 ?

Inductor arrived, I mounted it and everything works perfectly. I made a small adjustment on the nearby trimmer and the distortion improved. I can therefore confirm, that if this problem should occur, it will be necessary to replace this component: - N.1 SHF-0186 or SHF-0186K (I have mounted SHF-0186...
by giancom120b
Mon Aug 19, 2019 6:39 am
Forum: Test Equipment & RF Equipment Alignment
Topic: IFR AEROFLEX 2975 Generator problem mmic H1 ?
Replies: 9
Views: 8921

Re: IFR AEROFLEX 2975 Generator problem mmic H1 ?

I mounted the new SHF-0186, the new resistors but I'm waiting for its inductor. I put a temporary inductor to run a preview test and the tool works perfectly and the levels are correct on the whole band. Without adjusting anything I get 4-5% distortion at 100% modulation and an error of about 6-7% o...
by giancom120b
Thu Aug 15, 2019 1:29 am
Forum: Test Equipment & RF Equipment Alignment
Topic: IFR AEROFLEX 2975 Generator problem mmic H1 ?
Replies: 9
Views: 8921

Re: IFR AEROFLEX 2975 Generator problem mmic H1 ?

OK thank you. In order to perform the adjustment I managed to make a hole on the chassis so that I could access the adjustment with the card mounted. Regarding the differences of SHF-0186 and SHF-0186K what do you think? They look very similar to me. I'm waiting for the components, as soon as they a...
by giancom120b
Wed Aug 14, 2019 12:32 am
Forum: Test Equipment & RF Equipment Alignment
Topic: IFR AEROFLEX 2975 Generator problem mmic H1 ?
Replies: 9
Views: 8921

Re: IFR AEROFLEX 2975 Generator problem mmic H1 ?

JRY sorry,
could you tell me the adjustment procedure for 1900, I think it is identical for the 2975 of which I can't find the manuals.

The spare part I found is the SHF-0186 do you think would be okay if it were the SHF-0186K?

The parameters seem very similar.
by giancom120b
Mon Aug 12, 2019 1:27 am
Forum: Test Equipment & RF Equipment Alignment
Topic: IFR AEROFLEX 2975 Generator problem mmic H1 ?
Replies: 9
Views: 8921

Re: IFR AEROFLEX 2975 Generator problem mmic H1 ?

Hi JRY,
yes I have found and I confirm that it is the part that you say.

I've already ordered it, as soon as it arrives I'll update you!
I also had to order the resistors and inductor that feeds the SFH0186, as it went short and caused these components to break.

Thank you
by giancom120b
Fri Aug 09, 2019 4:09 pm
Forum: Test Equipment & RF Equipment Alignment
Topic: IFR AEROFLEX 2975 Generator problem mmic H1 ?
Replies: 9
Views: 8921

IFR AEROFLEX 2975 Generator problem mmic H1 ?

Hi to all, I had a problem with my 2975's generator. The problem was identified, a mmic was burned at the output of the generator module. The supply resistances are also damaged with it, as the MMIC has shorted. I ask you if any of you could tell me what kind of MMIC is: On the component is written ...
by giancom120b
Wed Mar 20, 2019 2:56 am
Forum: Test Equipment & RF Equipment Alignment
Topic: IFR2975 hangs on soft power-down
Replies: 2
Views: 5631

Re: IFR2975 hangs on soft power-down

Hi bigbop, have you checked the bios settings?
by giancom120b
Sun Feb 03, 2019 11:53 am
Forum: Test Equipment & RF Equipment Alignment
Topic: IFR 2975 MOTHER BOARD PROBLEM
Replies: 3
Views: 7835

Re: IFR 2975 MOTHER BOARD PROBLEM

I used this:
Kontron 18010-0000-00-0 for card ETX-P3T
by giancom120b
Wed Dec 19, 2018 12:13 am
Forum: Test Equipment & RF Equipment Alignment
Topic: IFR 2975 MOTHER BOARD PROBLEM
Replies: 3
Views: 7835

Re: IFR 2975 MOTHER BOARD PROBLEM

I update you on the situation, maybe it could be useful. I solved the problem by working on an evaluetion board, by connecting the floppy I was able to complete the BIOS update procedure that was successful.   The UMB error upper limit address is not an error but is an indication of use of the memor...
by giancom120b
Thu Oct 04, 2018 11:37 am
Forum: Test Equipment & RF Equipment Alignment
Topic: IFR 2975 MOTHER BOARD PROBLEM
Replies: 3
Views: 7835

IFR 2975 MOTHER BOARD PROBLEM

Hi to all, i have IFR 2975 with motherboard kontron 18020-0000-40-1 locked. The first problem was this error: UMB upper limit address. Then he completely stopped trying to reset the bios by not letting me access anymore. This card have BIOS version M815R117. we tried to update the bios (R118) but di...
by giancom120b
Sat Sep 08, 2018 2:05 pm
Forum: Test Equipment & RF Equipment Alignment
Topic: Aerolflex Ifr 2975 Service manual?
Replies: 1
Views: 5705

Aerolflex Ifr 2975 Service manual?

Hi to all, looking service manual for radio test set Aeroflex IFR 2975.

Can you help me?
Every help is appreciated.

Thanks to all

Best regard
Gianfranco
by giancom120b
Wed Jul 04, 2018 10:53 pm
Forum: Test Equipment & RF Equipment Alignment
Topic: Aeroflex (IFR) Questions
Replies: 629
Views: 295288

Re: Aeroflex (IFR) Questions

While the options are stored in the RTC memory, the cals are store in the purple Tadiran tl-5135 battery on the CPU module. If the purple battery is dead, the cals will be retrieved from the front panel controller until replaced and the unit recalibrated. IFR never made COM-120S that went above 1gh...
by giancom120b
Fri Feb 16, 2018 11:22 am
Forum: Test Equipment & RF Equipment Alignment
Topic: Aeroflex (IFR) Questions
Replies: 629
Views: 295288

Re: Aeroflex (IFR) Questions

Hi to all,
the ifr 1900 whats frequency range?
I have seen video on youtube...ifr 1900 receiving at 7.080MHz ...

In datasheet spec start frequency at 10 MHz...

How is it possible?
Real frequency range?

Best regard
Gianfranco
by giancom120b
Mon Mar 14, 2016 12:14 pm
Forum: Test Equipment & RF Equipment Alignment
Topic: IFR-COM 120B Distorsion meter fail
Replies: 5
Views: 2693

Re: IFR-COM 120B Distorsion meter fail

I JRY very thanks for you answer. I replaced full caps on BASEBAND TRAY and DIGITAL TRAY and recalibrate the unit ,this porblem is not solved. Is possible to fault in receiver? I'm testing receiver and ok! how can testing loop signal? This problem is a BASEBAND TRAY or CONTROLLER TRAY not read segna...
by giancom120b
Fri Mar 11, 2016 4:19 am
Forum: Test Equipment & RF Equipment Alignment
Topic: IFR-COM 120B Distorsion meter fail
Replies: 5
Views: 2693

Re: IFR-COM 120B Distorsion meter fail

This problem suspect only self test, distorsion and sinad reading is correct...
In a loop test:

Image
by giancom120b
Wed Mar 09, 2016 6:51 am
Forum: Test Equipment & RF Equipment Alignment
Topic: IFR-COM 120B Distorsion meter fail
Replies: 5
Views: 2693

IFR-COM 120B Distorsion meter fail

Hi all forum, I have the problem in my com 120B: DISTORSION METER FAIL http://gr.rossoalice.alice.it/fmc/antefrm.php?filename=/PUBLIC/Error.jpg I changed all capacitor on BASEBAND TRAY and RECALIBRATE DEVIATION METER in calibration menu, this problem is not solved! http://gr.rossoalice.alice.it/fmc/...
by giancom120b
Thu Feb 11, 2016 5:46 am
Forum: Test Equipment & RF Equipment Alignment
Topic: IFR COM-120B Analyzer problem
Replies: 2
Views: 2185

Re: IFR COM-120B Analyzer problem

after all the shift I experience on the higher spans is not so serious, so I think I could accept it. I would like to thank you all the guys who read my post but my special thanks absolutely have to go to Wowbagger for the kind, polite, but always precise and exhaustive cooperation to solve our issu...
by giancom120b
Tue Feb 09, 2016 3:11 pm
Forum: Test Equipment & RF Equipment Alignment
Topic: IFR COM-120B Analyzer problem
Replies: 2
Views: 2185

IFR COM-120B Analyzer problem

Hello to all forum participants, I would like to ask you about a problem occurred on my COM 120b. In the following spans my analyser shows the track a little bit shifted away: 100KHz division trace is shifted 500Khz division trace is shifted 1MHz division trace is shifted ---------------------------...

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