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Search found 2018 matches

by kcbooboo
Mon Mar 12, 2018 5:13 am
Forum: Base Stations, Repeaters, General Infrastructure
Topic: MSF5000 power control test mode
Replies: 6
Views: 352

Re: MSF5000 power control test mode

You probably can't fix anything on the ceramic IPA substrate but the surrounding discrete parts might be easy to replace. The style of IPA/REG in that manual is the "old" type. The newer ones use a small RF brick and the majority of the circuit board is the regulator and an interface to th...
by kcbooboo
Tue Feb 27, 2018 4:02 am
Forum: Base Stations, Repeaters, General Infrastructure
Topic: MSF5000 power control test mode
Replies: 6
Views: 352

Re: MSF5000 power control test mode

Did you find the problem?

Bob M.
by kcbooboo
Tue Feb 20, 2018 9:04 am
Forum: Base Stations, Repeaters, General Infrastructure
Topic: MSF5000 power control test mode
Replies: 6
Views: 352

Re: MSF5000 power control test mode

Additional info: find 6881082E20 in the Motorola MSF section and open the VHF IPA and Regulator PDF file. It has troubleshooting procedures for both assemblies. The test procedure even documents how to put the station into tSt mode. The pot could go open. That's often how they fail. The arm doesn't ...
by kcbooboo
Tue Feb 20, 2018 8:01 am
Forum: Base Stations, Repeaters, General Infrastructure
Topic: MSF5000 power control test mode
Replies: 6
Views: 352

Re: MSF5000 power control test mode

1. Sorry. It is documented, although very hard to find, in some manuals, and that IS the procedure to enter power control bypass test mode. In the Motorola MSF section of repeater-builder, search for 6881082E05 and go to PDF page 26. 2. No. The power control circuit, which includes the front panel p...
by kcbooboo
Wed Jan 10, 2018 4:48 am
Forum: General Motorola Solutions & Legacy Radio Discussion
Topic: Spectra 146-174 110w capacitors
Replies: 21
Views: 1628

Re: Spectra 146-174 110w capacitors

The 2nd oscillator in the Spectra RF board is a phase-locked-loop design. There's one and only one potentiometer inside those radios and it adjusts the PLL frequency. The pots can go bad/open, and the oscillator dies or is way off frequency so you receive nothing. Play with that pot a bit. Also read...
by kcbooboo
Tue Jan 02, 2018 5:15 am
Forum: General Motorola Solutions & Legacy Radio Discussion
Topic: Spectra 146-174 110w capacitors
Replies: 21
Views: 1628

Re: Spectra 146-174 110w capacitors

If you go to www.repeater-builder.com, Motorola area, Spectra section, "Radio and Equipment Modification Articles", you will find the 2nd, 3rd, and 4th items to be rather pertinent. In particular you should avail yourself of the recap offers made by AI4JI in the 4th link.

Bob M.
by kcbooboo
Mon Dec 18, 2017 7:58 am
Forum: General Motorola Solutions & Legacy Radio Discussion
Topic: MSF5000 UHF PA interchange
Replies: 6
Views: 607

Re: MSF5000 UHF PA interchange

You can thank Motorola for being so consistent in their cable labelling color codes. That's bitten more than one user.

Bob M.
by kcbooboo
Tue Dec 12, 2017 5:33 am
Forum: Test Equipment & RF Equipment Alignment
Topic: COM-120B Power Supply polarity of the capacitors !!
Replies: 4
Views: 307

Re: COM-120B Power Supply polarity of the capacitors !!

Usually there's a white or silver line along the side that marks the negative lead of the cap. In the photo, this line wraps over the top of the cap and is on the side opposite from those yellow connectors. If this is a power supply board, there are probably negative power supplies where the positiv...
by kcbooboo
Wed Nov 08, 2017 5:05 am
Forum: Test Equipment & RF Equipment Alignment
Topic: R2001D/2008D/2009D etc, Power Meter Calibration
Replies: 4
Views: 343

Re: R2001D/2008D/2009D etc, Power Meter Calibration

On the A/B/C units, the dummy load, and hence the RF sampling circuit, are all inside the RF input module (A11) where the step attenuator resides. As this is a very well shielded and sealed module, it's not something that can be readily adjusted in the field. The mfgr had test jigs for such assembli...
by kcbooboo
Wed Nov 08, 2017 4:56 am
Forum: Base Stations, Repeaters, General Infrastructure
Topic: Convert a Henry Amp to do simplex
Replies: 12
Views: 586

Re: Convert a Henry Amp to do simplex

The 100w amps can have a DPDT relay installed inside, but a 200w amp might be a bit too much power for that kind of setup. The relay will take some number of milliseconds to activate when its circuit senses RF, and the amplifier itself may start putting out power before or while the relay switches. ...
by kcbooboo
Sun Sep 03, 2017 4:55 am
Forum: Base Stations, Repeaters, General Infrastructure
Topic: Typical Exciter Output for Base Station and Repeaters
Replies: 4
Views: 477

Re: Typical Exciter Output for Base Station and Repeaters

I don't know. As the Quantro uses an MSF5000's PA which needs 2-4 watts, there could be an IPA module in the Quantar chassis that amplifies the raw exciter to the level required by the MSF5000 PA. I have no documentation on the Quantro, just the Quantar.

Bob M.
by kcbooboo
Fri Sep 01, 2017 2:26 am
Forum: Base Stations, Repeaters, General Infrastructure
Topic: Typical Exciter Output for Base Station and Repeaters
Replies: 4
Views: 477

Re: Typical Exciter Output for Base Station and Repeaters

Add VHF-Lo as a column for the Micor only. Micors tend to send 400-600 milliwatts to the PA. MSR2000 is probably the same as the Micor but I didn't research it. MSF5000, VHF-Hi, UHF (403-474), 800, 900 IPA output is 2-4 watts. MTR2000 and MTR3000 exciter both output +14 dBm or about 30 milliwatts. Q...
by kcbooboo
Thu Aug 24, 2017 4:13 am
Forum: General Motorola Solutions & Legacy Radio Discussion
Topic: Syntor X9000, always in Carrier Squelch?
Replies: 11
Views: 931

Re: Syntor X9000, always in Carrier Squelch?

Motorola has used several methods at the mobile microphone to enable coded squelch: The button on the back of the mike... 1. must make contact with chassis ground (a metal clip screwed to a metal chassis). 2. must make contact with a larger metallic outer ring around it (a metal clip that doesn't ne...
by kcbooboo
Sun Aug 13, 2017 4:55 am
Forum: General Motorola Solutions & Legacy Radio Discussion
Topic: Maratrac continuous duty transmit power?
Replies: 9
Views: 959

Re: Maratrac continuous duty transmit power?

The case is cast metal of some kind, probably aluminum or an alloy. Welding could be difficult. Easier to mill it flat and bolt on a decent-sized finned heat sink.

Interfacing the radio as a repeater transmitter is quite easy. I bet there's at least one article on the web that deals with it.

Bob M.
by kcbooboo
Thu Aug 10, 2017 3:43 pm
Forum: General Motorola Solutions & Legacy Radio Discussion
Topic: CDM1550s without heads - can they be used for a repeater?
Replies: 8
Views: 971

Re: CDM1550s without heads - can they be used for a repeater?

According to the service manual, the radio CAN be programmed to turn on and off with IGNITION voltage and it CAN ignore the ON/OFF switch on the volume control. But you have to be careful when playing with that programming because you could get the radio in a state where it can't be turned on with e...
by kcbooboo
Thu Aug 10, 2017 3:28 pm
Forum: Test Equipment & RF Equipment Alignment
Topic: Motorola R2001A
Replies: 34
Views: 2556

Re: Motorola R2001A

Bernie found some letters on one connector. They appear to be Omni-Spectra "OMQ" series, which have not been made since the late 70s, early 80s. There may not be anything that will actually fit properly these days.

Bob M.
by kcbooboo
Thu Aug 10, 2017 4:43 am
Forum: Test Equipment & RF Equipment Alignment
Topic: Motorola R2001A
Replies: 34
Views: 2556

Re: Motorola R2001A

Thanks. It looks bigger than SMB but smaller than SMA. Also could be reverse-polarity.

I presume they used the same extender kit on the entire R2001 line, however it's not inconceivable that they used something else on the "D", where so much changed.

Bob M.
by kcbooboo
Wed Aug 09, 2017 8:03 am
Forum: Test Equipment & RF Equipment Alignment
Topic: Motorola R2001A
Replies: 34
Views: 2556

Re: Motorola R2001A

Does DPJ126 or Jry or anyone else know what type of RF connectors were used on the RF boards and motherboard? I'd like to make some RF extender cables so I can align the boards above the chassis. I already have 72-pin and 100-pin extender cards. They look like SMA without the threaded outer part or ...
by kcbooboo
Fri Aug 04, 2017 4:36 am
Forum: General Motorola Solutions & Legacy Radio Discussion
Topic: CDM1550s without heads - can they be used for a repeater?
Replies: 8
Views: 971

Re: CDM1550s without heads - can they be used for a repeater?

Not sure if the radio requires the control head to pass self-tests.

Probably safer to pull the flex cable out of the radio and leave it attached to the control head.

Bob M.
by kcbooboo
Fri Aug 04, 2017 4:34 am
Forum: General Motorola Solutions & Legacy Radio Discussion
Topic: CDM1550 - switchable 3dB pad - does this exist?
Replies: 4
Views: 601

Re: CDM1550 - switchable 3dB pad - does this exist?

Could it be a per-channel "Local/DX" setting, like GM300s have?

Bob M.
by kcbooboo
Thu Jul 27, 2017 8:25 am
Forum: Test Equipment & RF Equipment Alignment
Topic: Motorola R2001A
Replies: 34
Views: 2556

Re: Motorola R2001A

I connected the CRT to the CR70 tester per the book, using pin 4 (focus) as G2. I got ZERO emission. I then tried it with pin 7 (accelerator) as G2; still zero emission. I went through the rejuvenate, auto restore, and both manual restore procedures. Still had zero emission using pin 4, but when I h...
by kcbooboo
Fri Jul 21, 2017 9:22 am
Forum: Test Equipment & RF Equipment Alignment
Topic: Motorola R2001A
Replies: 34
Views: 2556

Re: Motorola R2001A

One more quick question. I know the CRT pins for filament, cathode, and control grid, but I'm not sure which is the correct pin or element to use as the second grid, or G2. The Sencore CR70 setup manual says pin 4 which is the Focus grid, but other research has indicated that the Focus, Geometry, an...
by kcbooboo
Fri Jul 21, 2017 1:48 am
Forum: Test Equipment & RF Equipment Alignment
Topic: Motorola R2001A
Replies: 34
Views: 2556

Re: Motorola R2001A

There are vertical and horizontal gain pots on the A2 card that control the overall CRT display. These are separate from the vertical and horizontal calibration pots that are on the A3 or front panel cards. Obviously noise coming through the RF section will raise the baseline. You might have to disc...
by kcbooboo
Tue Jul 18, 2017 11:58 am
Forum: Test Equipment & RF Equipment Alignment
Topic: Motorola R2001A
Replies: 34
Views: 2556

Re: Motorola R2001A

Lynn: I realize it's been a while, but things go slow here. My CRT is still quite dim. A friend had one in the same condition so he bought a rather used (and needing repair) Sencore CR70 CRT tester/rejuvenator. He ran his CRT on that and after a few rejuv cycles, he said it looks like a brand new tu...
by kcbooboo
Sat May 06, 2017 12:28 pm
Forum: Radio Programming
Topic: CDM750 TX Alignment?
Replies: 3
Views: 593

Re: CDM750 TX Alignment?

Yes, there's a separate program called TUNER that does all the alignments.

If the programming software is newer than a few years, remember that it only allows narrow-band (2.5 kHz) programming unless you've got the special entitlement key to allow 5 kHz deviation.

Bob M.
by kcbooboo
Sun Apr 16, 2017 5:16 am
Forum: Test Equipment & RF Equipment Alignment
Topic: R2001C/HS will not power up.
Replies: 16
Views: 1110

Re: R2001C/HS will not power up.

The supply takes incoming 120VAC and reduces it through a transformer and the four stud diodes to create "RAW DC" that's in the 12-16V range. The incoming 12VDC line joins up at this point. Then they use the RAW DC to run a 20 kHz oscillator and some switching transistors that feed a secon...
by kcbooboo
Fri Apr 07, 2017 5:55 am
Forum: Base Stations, Repeaters, General Infrastructure
Topic: Removing wires from MTR2000 wireline block
Replies: 9
Views: 881

Re: Removing wires from MTR2000 wireline block

Easy is a relative term. Pull the wireline card, pull the station control/exciter/receiver modules, unplug some connectors, cut some ty-wraps, remove the screws holding the rear cover on, remove any remaining screws holding the backplane to the chassis. If this was my station, I'd do all of that. I ...
by kcbooboo
Wed Apr 05, 2017 6:29 am
Forum: Test Equipment & RF Equipment Alignment
Topic: R2100 LVPS differences
Replies: 6
Views: 559

Re: R2100 LVPS differences

The A2 card in the "A" is an RTC4007A. The "B" and "C" use an RTC4007B. So they "might" be interchangeable. Bernie would probably know for sure.

Are you sure the "U" isn't a "D" or some other letter?

Bob M.
by kcbooboo
Tue Apr 04, 2017 12:01 pm
Forum: Base Stations, Repeaters, General Infrastructure
Topic: Removing wires from MTR2000 wireline block
Replies: 9
Views: 881

Re: Removing wires from MTR2000 wireline block

Well, I CAN tilt the plastic blocks up and down, it's just not possible to grab it to get both edges to come out at the same time, because the opening in the metal plate over the backplane just isn't big enough to put anything in to wedge it out. Nothing inside the rectangular holes seems to move ei...
by kcbooboo
Sun Apr 02, 2017 10:20 am
Forum: Test Equipment & RF Equipment Alignment
Topic: R2100 LVPS differences
Replies: 6
Views: 559

Re: R2100 LVPS differences

The B and C LVPS are the same. I believe the A is quite different but still modular, while the D is totally different.

Bob M.
by kcbooboo
Tue Mar 28, 2017 3:02 am
Forum: Test Equipment & RF Equipment Alignment
Topic: R2001C/HS will not power up.
Replies: 16
Views: 1110

Re: R2001C/HS will not power up.

They use Schottky diodes in the 12V supply and the readings are different from ordinary silicon or germanium diodes. I think with my Fluke 189 DMM in diode mode I got around 0.35V drop on three and 0.1V drop on the fourth, and I replaced the fourth one. The new one also had 0.1V drop, so I didn't kn...
by kcbooboo
Mon Mar 27, 2017 6:58 am
Forum: Base Stations, Repeaters, General Infrastructure
Topic: Removing wires from MTR2000 wireline block
Replies: 9
Views: 881

Re: Removing wires from MTR2000 wireline block

Well, I yanked and wiggled and the plastic block just does not want to come off. Now it could be that the remnants of the wires I snipped are holding it in place, as the insulation is larger than the holes the wires go through. I'll have to snip them right at the plastic block. Do I first have to re...
by kcbooboo
Mon Mar 27, 2017 4:35 am
Forum: Test Equipment & RF Equipment Alignment
Topic: R2001C/HS will not power up.
Replies: 16
Views: 1110

Re: R2001C/HS will not power up.

Try powering it up with 12VDC. Those units take the incoming 120VAC and run it through a transformer and rectifiers to come up with 12VDC that's used by the rest of the supply. Could be bad diodes or filter caps in the 120VAC to 12VDC part of the supply. You may eventually want to, or need to, repla...
by kcbooboo
Mon Mar 27, 2017 4:31 am
Forum: Base Stations, Repeaters, General Infrastructure
Topic: Removing wires from MTR2000 wireline block
Replies: 9
Views: 881

Re: Removing wires from MTR2000 wireline block

Thanks. It did seem as if it would unsnap. The block on another station was sitting at an odd angle and I didn't know it could be fully removed. I'll give that a try. It's almost as if someone soldered the wires to the contacts inside.

Bob M.
by kcbooboo
Sun Mar 26, 2017 9:45 am
Forum: Base Stations, Repeaters, General Infrastructure
Topic: Removing wires from MTR2000 wireline block
Replies: 9
Views: 881

Removing wires from MTR2000 wireline block

I've pushed, pulled, and stuffed rather strong tools into the rectangular holes in the wireline block on the back of the station, but nothing seems to release the wires from the round holes. Is there a trick to this? How far down must I push a tool (a small jeweler's screwdriver)? Must I angle the t...
by kcbooboo
Fri Mar 24, 2017 1:00 pm
Forum: Base Stations, Repeaters, General Infrastructure
Topic: MTR2K local mic audio adjust
Replies: 1
Views: 425

Re: MTR2K local mic audio adjust

I don't recall seeing anything specific to the local mike. Interestingly, mine is too soft!

Bob M.
by kcbooboo
Sun Mar 12, 2017 9:31 am
Forum: Base Stations, Repeaters, General Infrastructure
Topic: Schematic for MTR2000 UHF 100 watt amp?
Replies: 3
Views: 566

Re: Schematic for MTR2000 UHF 100 watt amp?

There seem to be TWO resistor pairs. R4560/4564 seems to determine the power and possibly range split. Another pair might be used to determine the band. The 100w UHF PA has 15k (153) resistors installed for R4560/4564. The 100w VHF-hi PA has 1.5k (152) resistors there and the 100w VHF-lo PA has 15k ...
by kcbooboo
Sat Mar 11, 2017 12:38 pm
Forum: Test Equipment & RF Equipment Alignment
Topic: R2001D Service Monitor
Replies: 10
Views: 1245

Re: R2001D Service Monitor

The fuse is most likely a PICO fuse. I never researched where to buy the connector though, but a lot of test equipment uses it. Probably a 1/16 amp.

Bob M.
by kcbooboo
Sat Mar 11, 2017 12:37 pm
Forum: Base Stations, Repeaters, General Infrastructure
Topic: Schematic for MTR2000 UHF 100 watt amp?
Replies: 3
Views: 566

Re: Schematic for MTR2000 UHF 100 watt amp?

The band identifier resistors seem to be the same one as on the VHF amplifiers, but the values are probably different. There's an article about making the 100w VHF amp work in the ham band that may be helpful.

Bob M.
======
by kcbooboo
Tue Mar 07, 2017 11:58 am
Forum: Base Stations, Repeaters, General Infrastructure
Topic: VHF Quantro PA fail problems
Replies: 9
Views: 1308

Re: VHF Quantro PA fail problems

I have a 350w VHF MSF5000 "Final Power Amplifier" manual section. It has a nice block diagram with a schematic of the support circuitry but only rectangular black boxes for the six PA modules. The similar lower-power PA schematics also don't have the PA module schematics. I'm thinking that...
by kcbooboo
Sat Mar 04, 2017 5:25 am
Forum: General Motorola Solutions & Legacy Radio Discussion
Topic: 146.52 channel elements
Replies: 7
Views: 1069

Re: 146.52 channel elements

ICM no longer does temperature compensation on channel elements. They will sell you crystals but that's it. The guy who did all the temp comp retired at the end of 2016 and no one else who still works there knows how to do it. One option is to get new crystals and add a crystal heater - such as the ...
by kcbooboo
Wed Feb 01, 2017 6:24 am
Forum: Test Equipment & RF Equipment Alignment
Topic: MFJ-269C Antenna Analyzer ?
Replies: 9
Views: 1197

Re: MFJ-269C Antenna Analyzer ?

I turned my unit on for the first time in several years. Batteries read 14.6V. Can't complain about that. I must have had a bad cell or two sometime before that. I also checked the battery type jumper inside: it was set for NO CHARGING. Also, all of the batteries had 2015 dates, so they probably sho...
by kcbooboo
Sun Jan 29, 2017 1:18 pm
Forum: Test Equipment & RF Equipment Alignment
Topic: MFJ-269C Antenna Analyzer ?
Replies: 9
Views: 1197

Re: MFJ-269C Antenna Analyzer ?

Thanks for the tip about the plug. Now to find out what size plug to buy. I wonder if it has to be shorted. Plugging one in should disconnect the internal battery pack, but then again, so should the power switch, but as the batteries do lose potency rather quickly, I suspect there's some leakage pat...
by kcbooboo
Sun Jan 29, 2017 1:14 pm
Forum: Base Stations, Repeaters, General Infrastructure
Topic: MTR2000 UHF Exciter Output?
Replies: 1
Views: 516

Re: MTR2000 UHF Exciter Output?

I couldn't find anything for the exciter, but when testing the PA on the bench, they call for a +12dBm input signal. Therefore I suspect the exciter puts out +10 to +16dBm.

Bob M.
by kcbooboo
Mon Jan 23, 2017 11:12 am
Forum: Base Stations, Repeaters, General Infrastructure
Topic: New member, working on a MSR2000
Replies: 12
Views: 1049

Re: New member, working on a MSR2000

I had a similar dirty pot on the power control module in a 120w VHF Micor mobile. It went open and was probably putting out over 250w. Eventually blew the big fuse in the A+ line after a LOT of talking. Probably a good idea to twirl every pot you can find just to clean the wiper and the carbon. Bob M.
by kcbooboo
Wed Jan 11, 2017 4:54 pm
Forum: General Motorola Solutions & Legacy Radio Discussion
Topic: Maxtrac To A 99ch Maxtrac Qestions.
Replies: 3
Views: 696

Re: Maxtrac To A 99ch Maxtrac Qestions.

Lab can save and write the tuning data into the radio when you blank it. A "normal" code plug only occupies the 512 bytes of EEPROM inside the CPU chip. That's also where the tuning data resides. It writes out 64 blocks of 8 bytes. An "extended" code plug occupies the CPU and als...
by kcbooboo
Thu Nov 03, 2016 2:07 pm
Forum: Test Equipment & RF Equipment Alignment
Topic: Motorola R2001A
Replies: 34
Views: 2556

Re: Motorola R2001A

Lynn: thanks for the offer, but hold on that for a while. I acquired an R2001D and will swap CRTs to see if that helps my R2001B brightness issue, and if so, I'll stick with the "D" tube, so I won't need to try to fix my CRT, although it looks brand new. If I hadn't acquired the "D&qu...
by kcbooboo
Tue Nov 01, 2016 9:00 am
Forum: Test Equipment & RF Equipment Alignment
Topic: Motorola R2001A
Replies: 34
Views: 2556

Re: Motorola R2001A

The values on the deflection plates really depend on where the trace is and what's being displayed on the screen. For example, I had already performed the (limited) alignment procedure on the unit and set the vertical position to dead center. I don't recall what the sweep speed was but there was no ...
by kcbooboo
Mon Oct 31, 2016 11:26 am
Forum: Test Equipment & RF Equipment Alignment
Topic: Tuner operation
Replies: 3
Views: 597

Re: Tuner operation

Thanks. I "assumed" that the Program button would do exactly that: program the radio, but as you mentioned, I apparently need to exit Tuner in order for the data to actually get sent to the radio. That was the only field I modified. I will read and save the codeplug with CPS next time I'm ...
by kcbooboo
Mon Oct 31, 2016 11:21 am
Forum: Test Equipment & RF Equipment Alignment
Topic: Motorola R2001A
Replies: 34
Views: 2556

Re: Motorola R2001A

My tube is an AEG, which I believe is Telefunken. There's not a burnt spot on it and physically it looks like a brand new tube. The CRT traces are nice and bright and clear; it's just the text that can barely be seen. The Z-Axis signals are the same 0-30V square waves or pulsed regardless of text or...

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