I have IFR/Macroni 2965A radio test set,first time It showed RTC battery lost,I replaced battery to new so machine work fine.But next day I turned on it showed Macroni LOGO,and displayed all self-test pass,first line showed"no program please download from PC". Is 2965A lost progarm or othe...

So if we lost battery on 120A/B,we will lost all options set?How should we do if it happens.

KN4HH Maybe you can try to find YEASU old FT180A radio and get AM filter(10.7MHZ 6K BW) have a try.I'm not sure whether in/out impedance match to 1600S. About fix,make a extend cable to connect out IF board for easy fix,and try to find some imformation at http://www.ko4bb.com/manuals/59.38.34.11/IFR...

I remeber some people said COM120 series option status and calibration data storaged both in NVRAM and eeprom in front panel CPU.I tried to replaced battery in COM120B,first power on it showed "loading ????? in front panel",and options no changed.But I'm not sure there is another battery i...

4031 is too old,4032 is better,but some are no duplex analyzer option(depend on software verision)
I have Marconi 2965,IFR COM120A/B,SI4032,SI4015,MOTOROLA R2600C,I found 120 series are more "friendly" to operate.

Hello Ccotto,
I just replaced all polar capacitors to SMD tantalum capacitor on digital tray,some none-polar capacitors(10uF) I just kept them.

Mark

Hi,I have HP8751A with some issue with power module and need to fix it,and I found operation and calibration manual from HP website,but no schematic and description for that.I don't know if anyone have it and may share to me,I'll really appreciate you,thanks.

Hello,I have bought ADVANTEST R3753A network analyzer and maybe it has some issue in RF unit.I can just found operation manual and nothing about repair.If anyone has service manual or other document about reapir would like share to me,I will so appreciated.Thinks

If battery has rated voltage,maybe it's memory fault.But most of time I found old machine lost their battery votage.

The center peak (the carrier) will not go away. It's the next peak that should null out when you get the deviation to be 3.2878kHz - so adjust your deviation until the second peak goes away, and see how close what you've entered is to the actual value. Thank you for your help all the time,I have pa...

I have a GM338 now it's failed to power on.When I press volume knob no any response form radio. I checked votages according to service manual.Power supply was 13.8V.First checked controller head,after I pressed power key,J0801 PIN2 rised up to 4.4V and hold on itself,but not accurate 5V. Next check...

I have a GM338 now it's failed to power on.When I press volume knob no any response form radio. I checked votages according to service manual.Power supply was 13.8V.First checked controller head,after I pressed power key,J0801 PIN2 rised up to 4.4V and hold on itself,but not accurate 5V. Next checke...

OK, then you do have an issue with the calibration of either the modulator or of the deviation meter. The best way to check that would be to set up as follows: Duplex mode, RF in = TR, RF out = TR @ -40dBm, Demod FM, 15 kHz RX IF BW, Gen1 set to Sine wave (all other modulators off), FM, 12.5kHz dev...

hello Max,I suggest you using SWR meter or power meter check like this: first,connect meter between repeater TX and duplex in,duplex out I suggest to connect a dump load 50 OHM,and transmit,check FWD and REF power.It measure repeater TX power and reflect from duplexer(means duplexer SWR). second,rep...

Actually, you don't need to loop the antenna to the TR - set the receiver to TR as well, and the loopback is done internally. You need to find a better place to host those pictures, or just attach them to your post here. I have no found any way to put picture here,so use word..... Set both TX and R...

jry and Bh7juo, Many thanks for that advice. Firstly brilliant to suggest taking off the front panel. I have been looking at this thing for so long sometimes you need a prompt for a simple solution like that. I have already ordered the connectors but don't need them now. The front panel is removed ...

I found some DIYers use 2 ASTRO Spectra radios to build a P25 mode repeater system.It seems like to radios link with audio and control line,and it has not good transmit effect. Because ASTRO Spectra has DSP,ADC DACchannel build-in,I consider that if we can find RX radio (for example)FSK modem output...

If picture is not visable,try to put their links in new browser window.

In regard to my previous post I now realise the 700 Khz signal provides a signal from the Receiver Tray to the Digital tray to drive the RF error meter. That is not my problem. I am still on the case trying to work out why the EL screen is bright orange. It seems no video content from Digital Tray ...

The simplest test is to replicate the self test manually: Duplex TX: 105.005 MHz, T/R port, -40dBm output, GEN1 1kHz tone, triangle, 3kHz peak deviation. Duplex RX: 105.000 MHz, T/R port, FM, 15kHz IF. Select distortion meter (discriminator input), deviation meter (range auto), power meter (range a...

Whit my 120A,I had bought some 10UF/16V SMD 1206 ceramic caps ready to replace all 10UF/16V caps which I can't not find any polarity mark on it but seems like electrolytic capacitor.Most of other electrolytic capacitor on BASEBAND tray allready replaced by tantalum.But self-test still failed in devi...

No any modulation output in FM mode? I suggest check modelation section......Recapped? First check any wrong in recapped section(caps swap,supply votage,etc....)You have service manual is lucky,I also want it.

Perhaps emergency signalling(MDC)need access control center(may called dispatcher station???) and station will transpond emergency call by another format to other radios in this group.I have no other radio and dispatcher station to confirm it.

The "A" firmware was very limited. It wasn't until the "B" CPU and firmware that a lot of cool stuff, like wide span analyzer, was added. Unfortunately, unless you can find a B CPU, you are stuck with what you have. OK thanks,I have no hope to wide span.and this time most want t...

hello Wowbagger,I had checked my 120A spectrum analyzer is work fine,but the max span is only 1MHz,even if it has option track generator,but 1MHz span is not enough to do lots of test.I checked CPU firmware version is 1.01,I don't know if 120A mode has only so narrow max span,or I can update firmwar...

OK,I checked the power votage ripple,found +12V line has about 500MV P-P ripple,and VP-P value changing with what show on display........I have to check power module.

No, that's not a battery issue - that sounds like the CPU has issues - probably bad caps as well (We got bit by "capacitor plague" pretty hard - damn cheap ripoff artists). I would suggest replacing all the caps you can. OK,I will try to replace more capacitor......And you mean that power...

The "Deviation failure" may be no more than needing to be recalibrated after you replaced the capacitors. It may also be a similar issue on the gen or receiver tray - after all, the deviation test is looping the TX back to the RX. The aux amp issue sounds like somebody switched on the opt...

You are correct about what component is the memory card. It contains the application. The fact the system boots at all indicates the firmware is OK. The card is corrupt - the section that contains the program for the display is valid, but the section that contains the main analyzer program has been...

hello everyone I have an IFR COM-120A service monitor,now the"deviation meter"failed in self-test.And I tried to replace most of capacitors on "BASEBAND TRAY"but it still failed.(why most of them but not all?It maybe has some "non-polarized electrolytic capacitor" 10uF,...

I had R2600C looked nice,but open case I cried because very series corrosion on CPU board because battery leakage.So replace backup battery if you old battery stiill installed on I Strongly recommended replace by new one......and I need service manual also,anybody please to send it to my mail? markq...

hello yachtbird,I had a COM-120B in 2011,that year I tried to repair the EL screen due to some display problem,not very success.But I had found datasheet of that EL screen,and it said 2 potentiometers under back of screen,one is adjust brightness and theother I forgot function(also about display),I ...