Search found 423 matches

by jry
Sat Jan 02, 2021 2:45 pm
Forum: Test Equipment & RF Equipment Alignment
Topic: IFR COM-120B Generator Programmable Attenuator
Replies: 3
Views: 171

Re: IFR COM-120B Generator Programmable Attenuator

I would just replace the whole unit.

There are used ones available at a reasonable price.

trying to repair that unit is not something I would do unless there wasn't a supply of used ones.

New they would be a small fortune but that model is NLA as new
by jry
Tue Dec 22, 2020 12:44 pm
Forum: ASTRO25 Series (XTS/XTL 1500/2500/5000) Subscribers
Topic: O5 to O3 control head swap?
Replies: 14
Views: 2842

Re: O5 to O3 control head swap?

thought the issue was getting the O3 head to work with a remote mount XTL currently configured and working with an O5 head. my comment was that I have never had any problem plugging the O3 head directly into the TIB /radio and never had to run the control head sync to get that operational. The butto...
by jry
Tue Dec 22, 2020 7:54 am
Forum: ASTRO25 Series (XTS/XTL 1500/2500/5000) Subscribers
Topic: O5 to O3 control head swap?
Replies: 14
Views: 2842

Re: O5 to O3 control head swap?

I plug the O3's into the TIB and just use the rear accessory cable for speaker and ignition This is my bench test setup and avoids all of the addition cables and heads for an 'O" series setup. W series remote is still a pain but those are just about gone for a real install the O3 extension cable wou...
by jry
Wed Nov 11, 2020 7:46 am
Forum: ASTRO25 Series (XTS/XTL 1500/2500/5000) Subscribers
Topic: XTS/XTL on 700 MHz P25 Trunking
Replies: 8
Views: 1552

Re: XTS/XTL on 700 MHz P25 Trunking

understand ...would be good to know what you find since I have run into similar issues .

Typically I have been able to brute force my way around them by the approaches you tried

I have an even worse customer base that still has XTS3000's in service and even a few Astro Spectra Plus units.
by jry
Tue Nov 10, 2020 2:39 pm
Forum: ASTRO25 Series (XTS/XTL 1500/2500/5000) Subscribers
Topic: XTS/XTL on 700 MHz P25 Trunking
Replies: 8
Views: 1552

Re: XTS/XTL on 700 MHz P25 Trunking

Sounds like a tough one.

You may want to ask over on the Communications Support forum aka the old P25 site.

There may be more expertise for this type of problem over there
by jry
Thu Sep 17, 2020 7:18 am
Forum: Test Equipment & RF Equipment Alignment
Topic: HP 8924C front panel buttons help
Replies: 14
Views: 1946

Re: HP 8924C front panel buttons help

surprised it had a bad keyboard ...fairly passive device but you may have lost the 5 volt through the cable. May have shorted and blown the trace. Like Rick I would have just swapped it though. Parts for the 8924X are plentiful right now so even though these a very repairable parts often not worth t...
by jry
Mon Aug 31, 2020 7:51 am
Forum: Test Equipment & RF Equipment Alignment
Topic: HP 8924C front panel buttons help
Replies: 14
Views: 1946

Re: HP 8924C front panel buttons help

there should only be some chokes on the filter assembly ...iyou may have lost the +5 volt to the keyboard from the processor. Sounds like the optical sensor /spinner is working but the select button is not chances are if the keyboard is almost dead than it mostly likely a bad interface chip on the p...
by jry
Sun Aug 30, 2020 12:09 pm
Forum: Test Equipment & RF Equipment Alignment
Topic: HP 8924C front panel buttons help
Replies: 14
Views: 1946

Re: HP 8924C front panel buttons help

IIRC correctly the front panel goes directly to the processor board.

On the 8924C it may get routed through a filter assembly. 25 pin D connector with some chokes for RFI ...once again going by memory.

Nothing active on the front panel ...may be your processor board and the interface IC's
by jry
Mon Jul 27, 2020 10:13 am
Forum: ASTRO25 Series (XTS/XTL 1500/2500/5000) Subscribers
Topic: Pinout Hirose to XTS
Replies: 3
Views: 2370

Re: Pinout Hirose to XTS

I think they may need to be the later version ...at least the Astro Saber needed the D version for keyload IIRC
by jry
Tue Jul 07, 2020 3:08 pm
Forum: Test Equipment & RF Equipment Alignment
Topic: IFR 1900 CSA, Factory Reset Sequence?
Replies: 3
Views: 1096

Re: IFR 1900 CSA, Factory Reset Sequence?

may have to be in the AUX screen first and then RCL MEMORY ...select option 10 Factory Defaults
by jry
Tue Jul 07, 2020 11:47 am
Forum: Test Equipment & RF Equipment Alignment
Topic: R2600B tracking generator fall off?
Replies: 3
Views: 939

Re: R2600B tracking generator fall off?

you have to have a tracking gen with an inverted sweep option as well ...at least the way I do it
by jry
Tue Jul 07, 2020 11:16 am
Forum: Test Equipment & RF Equipment Alignment
Topic: R2600B tracking generator fall off?
Replies: 3
Views: 939

Re: R2600B tracking generator fall off?

see this all the time.
unit needs to be re-cal'd... there are multiple filters that need to be aligned ...real PITA part of the R26XX calibration
by jry
Sat Jul 04, 2020 4:53 am
Forum: Test Equipment & RF Equipment Alignment
Topic: IFR 1900 upside down display
Replies: 10
Views: 1591

Re: IFR 1900 upside down display

make sue the eraser is new ...never been used and be careful.
usually clean the contacts with alcohol ( 99%) or contact cleaner
by jry
Wed Jul 01, 2020 3:52 am
Forum: Test Equipment & RF Equipment Alignment
Topic: R2600 service manual????
Replies: 26
Views: 8143

Re: R2600 service manual????

there was a procedure ...believe here on this board ...to set the CAL temperatures.

Unit keeps a cold set of CAL and a WARM set IIRC.

First step in fixing or troubleshooting any R26XX is to clear the NVRAM which forces it back through re-creating the CAL tables as well
by jry
Wed Jun 24, 2020 6:23 am
Forum: Test Equipment & RF Equipment Alignment
Topic: IFR 1900 upside down display
Replies: 10
Views: 1591

Re: IFR 1900 upside down display

usual fix is to tear apart the front panel and the TFT display to re-seat the internal connectors. I usually verify with the display outside the unit first and RTV the connectors as a final step before complete re-assembly. Same issue as the COM-120C ...uses same display. you may want to consider up...
by jry
Wed Jun 24, 2020 6:18 am
Forum: Test Equipment & RF Equipment Alignment
Topic: IFR 1900 CSA, Factory Reset Sequence?
Replies: 3
Views: 1096

Re: IFR 1900 CSA, Factory Reset Sequence?

same as the 1600 ....RCL MEMORY ...select option 10 Factory Defaults
by jry
Fri May 29, 2020 5:13 am
Forum: ASTRO25 Series (XTS/XTL 1500/2500/5000) Subscribers
Topic: Flash vs Code Plug
Replies: 3
Views: 1212

Re: Flash vs Code Plug

codeplug is a term from the good old days when we used to actually blow a PROM and physically swap the part for the frequency information in relatively dumb radios compared to today. Still refers to the customer specific information but now greatly expanded to cover much more than just frequencies a...
by jry
Wed May 27, 2020 8:28 am
Forum: Test Equipment & RF Equipment Alignment
Topic: Aeroflex (IFR) Questions
Replies: 623
Views: 98536

Re: Aeroflex (IFR) Questions

just a quick follow on comment. The files used in a standard update were not enough to recover this problem ...standard update process would not fix the issues. The flash had become so corrupt that the the internal file system had to essentially be re-formatted before the update could be completed. ...
by jry
Thu May 21, 2020 3:40 am
Forum: Test Equipment & RF Equipment Alignment
Topic: Aeroflex IFR 2975 Hard Drive issue
Replies: 4
Views: 1180

Re: Aeroflex IFR 2975 Hard Drive issue

there are some critical files if you have the expertise to extract and move over to a good image and a good drive. On all the 2975's I do I replace the older hard drive with an SSD version. The hard drives are just about guaranteed to fail at some point, Boots faster as well. Processor battery shoul...
by jry
Fri Apr 17, 2020 7:40 am
Forum: Test Equipment & RF Equipment Alignment
Topic: Aeroflex Com-120C Maintainance Manual AC0600 needed..
Replies: 2
Views: 1142

Re: Aeroflex Com-120C Maintainance Manual AC0600 needed..

that information is not in the service manual regardless of version
by jry
Mon Mar 16, 2020 11:31 am
Forum: Test Equipment & RF Equipment Alignment
Topic: R2024D
Replies: 3
Views: 1330

Re: R2024D

its a standard part ...brushless DC 12VDC ...look up the orig and try to match the CFM rating.
by jry
Wed Mar 11, 2020 5:16 am
Forum: Test Equipment & RF Equipment Alignment
Topic: R2024D
Replies: 3
Views: 1330

Re: R2024D

that has the encryption /secure board ( check the battery for corrosion ) and remote options. Believe the later version of the remote board was RS-232 /HP-IB so could go either way. This also means it has the electronic ( relay ) attenuator which was preferable IMHO to the standard mechanical one Sh...
by jry
Mon Feb 24, 2020 5:41 am
Forum: Test Equipment & RF Equipment Alignment
Topic: IFR Com 120A synthesizer unlocked
Replies: 2
Views: 1175

Re: IFR Com 120A synthesizer unlocked

yet another weak point on the COM-120 series.

lots of different stuff fails ...assume you are talking about the first LO generate.

PM me if you want it repaired . note repairing just the module is possible by itself but the calibration may be impacted.
by jry
Mon Feb 24, 2020 5:32 am
Forum: Test Equipment & RF Equipment Alignment
Topic: Motorola R2600 options?
Replies: 16
Views: 4173

Re: Motorola R2600 options?

the monitor beeps on the C/D versions and not on the A/B version .

PM me if you want it repaired and updated

PS Always check the processor board battery and replace every few years ( better early than late ) since they can leak and damage ( read total unit ) the PCB.
by jry
Thu Feb 13, 2020 10:13 am
Forum: Test Equipment & RF Equipment Alignment
Topic: IFR-1900 Display suddenly inverted and reversed
Replies: 6
Views: 1539

Re: IFR-1900 Display suddenly inverted and reversed

com-120c uses the same display setup as well.

Usually RTV the connectors as well to hold them in place.
by jry
Tue Feb 11, 2020 7:53 am
Forum: Test Equipment & RF Equipment Alignment
Topic: Motorola R2600 options?
Replies: 16
Views: 4173

Re: Motorola R2600 options?

you need to have a U43 with those options enabled as well.
That EEPROM is model specific at the very least ( R2600A/B is different than the R26XXC/D) and in theory has some HW specific calibration data so make sure you keep a copy of your original one.
by jry
Mon Feb 10, 2020 5:29 am
Forum: Test Equipment & RF Equipment Alignment
Topic: Motorola R2600 options?
Replies: 16
Views: 4173

Re: Motorola R2600 options?

actually on the very early R2600's there were two different ASIC's ...one with the tracking gen option and one without. Later they went to a single ASIC ...late B's and C version always had the tracking gen ASIC. You can run the 1.07 firmware on the A/B version but regardless of what options it show...
by jry
Thu Jan 30, 2020 4:39 pm
Forum: Test Equipment & RF Equipment Alignment
Topic: Motorola R2600C
Replies: 2
Views: 1186

Re: Motorola R2600C

latest was actually 7.X that would work in the R2600C ...primarily for the R2670A to support the narrow band SmartNet trunking feature though
by jry
Tue Jan 07, 2020 8:10 am
Forum: Test Equipment & RF Equipment Alignment
Topic: Motorola R2600B screen problems
Replies: 3
Views: 1225

Re: Motorola R2600B screen problems

There are adjustments on the video card. You can try to adjust. On the B version you may want to make sure you clean the CRT and anode cap and cable along with the side of the chassis near the anode cap. If it doesn't have an insulator on that part of the chassis I usually use some clear packing tap...
by jry
Tue Jan 07, 2020 8:10 am
Forum: Test Equipment & RF Equipment Alignment
Topic: Motorola R2600B screen problems
Replies: 3
Views: 1225

Re: Motorola R2600B screen problems

There are adjustments on the video card. You can try to adjust. On the B version you may want to make sure you clean the CRT and anode cap and cable along with the side of the chassis near the anode cap. If it doesn't have an insulator on that part of the chassis I usually use some clear packing tap...
by jry
Mon Jan 06, 2020 8:49 am
Forum: Test Equipment & RF Equipment Alignment
Topic: R2001D checksum warning
Replies: 3
Views: 1347

Re: R2001D checksum warning

I would pull the cellular ...you may want to install the jumpers on the backplane to bypass but not sure it's always needed without looking at the SM Usually the cellular option is installed in either the A12 or A13 slot and in the case of a 2010D you should have a blank/jumper board installed as we...
by jry
Sat Jan 04, 2020 7:49 am
Forum: Test Equipment & RF Equipment Alignment
Topic: R2660C tracking generator
Replies: 2
Views: 1116

Re: R2660C tracking generator

so there are internal filters that have to be aligned on the R26XX series. I always align and test these on units and replace the processor battery as SOP They become very apparent in the track gen mode and especially as the width increases. Part of what you are also seeing is the R26XXC/D stitching...
by jry
Sat Dec 21, 2019 8:04 am
Forum: Test Equipment & RF Equipment Alignment
Topic: R2600B - Will not power up / Need DC Cable Part No.
Replies: 5
Views: 1490

Re: R2600B - Will not power up / Need DC Cable Part No.

the actual one is a four pin ...only two are really used ...1and 2 are A+ and 4 is A- ....or something like that.

PM me if you want it exchanged
by jry
Thu Dec 19, 2019 3:36 pm
Forum: Test Equipment & RF Equipment Alignment
Topic: R2600B - Will not power up / Need DC Cable Part No.
Replies: 5
Views: 1490

Re: R2600B - Will not power up / Need DC Cable Part No.

standard four pin circular connector ....top pin is A+ bottom is ground /chassis...takes around 7 amps depending on the DC voltage used ...higher DC lower amps. Measure resistance across the hot and neutral on the AC connector with good fuses. Should be around 200 ohm IIRC. verify the AC operating r...
by jry
Wed Nov 27, 2019 3:15 pm
Forum: Test Equipment & RF Equipment Alignment
Topic: IFR 1200S Looking for Help with PSU fault
Replies: 3
Views: 1186

Re: IFR 1200S Looking for Help with PSU fault

12v is the minimum to run the dc-dc converter. you have to ground the on off control as well as providing DC power usually a 6 ohm load would work on both to start with. I would just repair what you have unless the PCB is severely damaged. In that case you be able to substitute a single IC type regu...
by jry
Wed Nov 27, 2019 9:14 am
Forum: Test Equipment & RF Equipment Alignment
Topic: IFR 1200S Looking for Help with PSU fault
Replies: 3
Views: 1186

Re: IFR 1200S Looking for Help with PSU fault

so I have repaired more of these than I can count. You really need a professional de-soldering tool to work on these. Without one chances are you will damage the PCB. The DC-DC section is likely where your problem is and usually they need to be re-capped regardless of the tops of the capacitors. Usu...
by jry
Wed Nov 20, 2019 5:03 am
Forum: Test Equipment & RF Equipment Alignment
Topic: R2660C Oddities?
Replies: 6
Views: 1749

Re: R2660C Oddities?

so I would look at the outputs of the LO's .... the R26XX uses a number of these even on just the monitor side. It may be that one of them is having a hard time locking. Look at the service manual ...you will need an SA that covers up to 2 or 3 Ghz for the higher frequency ones. You can look at the ...
by jry
Tue Nov 19, 2019 10:53 am
Forum: Test Equipment & RF Equipment Alignment
Topic: R2001C problems - help gratefully received
Replies: 13
Views: 2354

Re: R2001C problems - help gratefully received

one other thought is that after you check the power supply and bias resistors to pull the PCB's, clean the edge connectors with 99% alcohol and re-seat.
by jry
Tue Nov 19, 2019 10:51 am
Forum: Test Equipment & RF Equipment Alignment
Topic: R2001C problems - help gratefully received
Replies: 13
Views: 2354

Re: R2001C problems - help gratefully received

The TXCO typically just runs off of one of the lower voltage rails like +12V. All that says is that the oven has come up to temperature.

If that light is not on than the frequency will be inaccurate and drifting as it comes on temp which is where the frequency was adjusted in the reference.
by jry
Tue Nov 19, 2019 10:47 am
Forum: Test Equipment & RF Equipment Alignment
Topic: R2660C Oddities?
Replies: 6
Views: 1749

Re: R2660C Oddities?

I have swapped the batteries without pulling the processor but I have done over a hundred of these units over the years .

You may want to pull the card ...remember it goes on the non component side when you re-install.

Yes the NVRAM clear is under the SPF and System Functions
by jry
Mon Nov 18, 2019 3:04 pm
Forum: Test Equipment & RF Equipment Alignment
Topic: R2660C Oddities?
Replies: 6
Views: 1749

Re: R2660C Oddities?

on all of the R26XX series I always start by doing a NVRAM reset which forces a full calibration.

The R26XX is heavily software driven and dependent on values calculated in the calibration routine,

After that compare to your known good unit
by jry
Mon Nov 18, 2019 6:25 am
Forum: Test Equipment & RF Equipment Alignment
Topic: R2001C problems - help gratefully received
Replies: 13
Views: 2354

Re: R2001C problems - help gratefully received

power supply caps for one . check the PS voltages and noise ...anything that old you usually have issues there. Also a lot of the CRT biases tend to drift due to the old carbon resistors aging and changing value. Usually these resistors will increase with age as the carbon used to create the value l...
by jry
Fri Nov 01, 2019 5:06 am
Forum: ASTRO Series (Astro Saber, Spectra, XTS3000/3500) Subscribers
Topic: xts3000 display replacement
Replies: 4
Views: 2004

Re: xts3000 display replacement

yes but there may be a firmware compatibility issue. The latest displays required the firmware above a certain level ...there was an SRN and Motorola did provide the firmware update for awhile. Someone may know the minimum or provide the SRN with the info. Worst case is try it and if you need the la...
by jry
Fri Sep 27, 2019 3:55 pm
Forum: Base Stations, Repeaters, General Infrastructure
Topic: Help Quantar Power Supply
Replies: 10
Views: 2048

Re: Help Quantar Power Supply

that Onan part number is the same as Motorola 0184906T04

Usually the Onan is better though
by jry
Fri Sep 27, 2019 3:24 pm
Forum: Base Stations, Repeaters, General Infrastructure
Topic: Help Quantar Power Supply
Replies: 10
Views: 2048

Re: Help Quantar Power Supply

he is probably referring to one of the other OEM's that supplied that part/module to Motorola. It's common to outsource the power supply modules to multiple vendors in lots of equipment and Motorola did this all the time in later products. In the good old days they designed and built them in house b...
by jry
Fri Sep 27, 2019 1:20 pm
Forum: Base Stations, Repeaters, General Infrastructure
Topic: Help Quantar Power Supply
Replies: 10
Views: 2048

Re: Help Quantar Power Supply

should be a ton on EBay.
They are selling 800 mhz chassis cheap right now
by jry
Wed Sep 25, 2019 5:31 am
Forum: Test Equipment & RF Equipment Alignment
Topic: IFR1200S battery pack?
Replies: 5
Views: 1731

Re: IFR1200S battery pack?

that part would cover the 500, 1200 and 1500 as well. Believe the 1100 typically used a different form factor but this version may fit inside as well depending on the exact vintage.
by jry
Fri Sep 13, 2019 7:44 am
Forum: Test Equipment & RF Equipment Alignment
Topic: IFR-1200S Off Frequency
Replies: 16
Views: 3658

Re: IFR-1200S Off Frequency

low loop is bad. 1200 series has two loops ...high and low. High loop is the 2Mhz ( 1.3 to 2.3 Ghz IIRC ) granularity part. Low loop covers the under 2Mhz part of the frequency synthesis. there are some alignments on the low loop and the crystal used as part of the loop has been known to drift out o...
by jry
Fri Aug 16, 2019 9:14 am
Forum: Test Equipment & RF Equipment Alignment
Topic: IFR AEROFLEX 2975 Generator problem mmic H1 ?
Replies: 9
Views: 1966

Re: IFR AEROFLEX 2975 Generator problem mmic H1 ?

doubt there is much or any difference ....have not looked at the datasheet though
by jry
Wed Aug 14, 2019 6:27 am
Forum: Test Equipment & RF Equipment Alignment
Topic: IFR AEROFLEX 2975 Generator problem mmic H1 ?
Replies: 9
Views: 1966

Re: IFR AEROFLEX 2975 Generator problem mmic H1 ?

you may have to run the module outside the unit. Input a signal mid band at 100% modulation or there about and adjust the bias to get the same modulation and minimal distortion. At least that's roughly what I did on the 1900's output module. I used the typical 8902A with the power sensor but an 8901...

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