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Search found 1409 matches

by jackhackett
Mon Jun 04, 2018 6:13 am
Forum: General Motorola Solutions & Legacy Radio Discussion
Topic: HTN4266A vehicle charger diagram wanted
Replies: 4
Views: 184

Re: HTN4266A vehicle charger diagram wanted

Is it HTN or NTN?
I believe there was an NTN4266 charger for HT90s.
by jackhackett
Thu May 31, 2018 5:31 am
Forum: General Motorola Solutions & Legacy Radio Discussion
Topic: CDM1250 TX / RX issues
Replies: 3
Views: 200

Re: CDM1250 TX / RX issues

Also could be a defective mini-UHF female connector. It could also be a bad antenna, antenna cable, PIN diodes, etc. Hard to tell with the amount of information given. We don't know if it was bench tested, if the output power and antenna system were checked with a watt meter, or if they're just lis...
by jackhackett
Tue May 29, 2018 10:15 pm
Forum: General Motorola Solutions & Legacy Radio Discussion
Topic: CDM1250 TX / RX issues
Replies: 3
Views: 200

Re: CDM1250 TX / RX issues

A common cause of noisy transmit is loose chassis screws, you can pop off the plastic cover and snug them up.
by jackhackett
Tue May 01, 2018 1:47 am
Forum: ASTRO Series (Astro Saber, Spectra, XTS3000/3500) Subscribers
Topic: Off the Fly Adjustment
Replies: 12
Views: 629

Re: Off the Fly Adjustment

If the receiver is off-freq by over 600 Hz, the Rx sensitivity / error correctibility for ASTRO25 codewords begins to fall off quickly. Yes, 800Hz might not be that noticeable on analog, but on digital things start to get flaky. For example I remember when the old Motorola VRMs would start to get b...
by jackhackett
Sat Apr 28, 2018 11:20 am
Forum: ASTRO Series (Astro Saber, Spectra, XTS3000/3500) Subscribers
Topic: Off the Fly Adjustment
Replies: 12
Views: 629

Re: Off the Fly Adjustment

fineshot1 wrote:Incidently that is only about 80Hz away from right on frequency and it usually does not get much better..


Your decimal point is off, it's 800Hz.
by jackhackett
Wed Apr 18, 2018 5:56 pm
Forum: General Motorola Solutions & Legacy Radio Discussion
Topic: CDM1250 Power Pin Short
Replies: 4
Views: 368

Re: CDM1250 Power Pin Short

Are you sure you're getting a dead short on the radio? I usually measure with a DMM set on diode test mode, and measure with the leads connected both ways. A radio with a good diode will show something like a half volt drop in one direction, and a high or open reading in the other direction. It may ...
by jackhackett
Mon Apr 09, 2018 7:03 pm
Forum: General Motorola Solutions & Legacy Radio Discussion
Topic: CDM1250 Power Pin Short
Replies: 4
Views: 368

Re: CDM1250 Power Pin Short

A dead short on the power connector is usually caused by a shorted protection diode. There is what is basically a large zener diode across the power connections, if voltage is hooked up backwards or exceeds the diode's rating it can cause the diode to fail as a dead short. This is to provide some pr...
by jackhackett
Sun Mar 18, 2018 6:34 am
Forum: General Motorola Solutions & Legacy Radio Discussion
Topic: Scan lights on CDM750
Replies: 4
Views: 510

Re: Scan lights on CDM750

As far as I recall, yes.
by jackhackett
Thu Mar 15, 2018 11:43 am
Forum: General Motorola Solutions & Legacy Radio Discussion
Topic: Scan lights on CDM750
Replies: 4
Views: 510

Re: Scan lights on CDM750

No. The green light blinks when it's scanning.
by jackhackett
Tue Mar 06, 2018 12:00 am
Forum: General Motorola Solutions & Legacy Radio Discussion
Topic: CDM1250 No Backlight or Other LED's
Replies: 9
Views: 1575

Re: CDM1250 No Backlight or Other LED's

Take the head off, chances are the circuit board is not seated in the plastic of the control head housing. There are little clear clips around the perimeter and the boards often pop out, which will cause button, display, volume, and light issues. Rob A loose control head board shouldn't cause volum...
by jackhackett
Wed Feb 28, 2018 7:47 pm
Forum: General Motorola Solutions & Legacy Radio Discussion
Topic: CDM1250 Model Number Issue
Replies: 4
Views: 472

Re: CDM1250 Model Number Issue

I had not looked at the numbers closely enough to spot that, I wonder why the OP only mentioned the missing AA? I'd guess either he missed it as well or it's a typo.
by jackhackett
Sat Feb 24, 2018 10:54 pm
Forum: General Motorola Solutions & Legacy Radio Discussion
Topic: CDM1250 No Backlight or Other LED's
Replies: 9
Views: 1575

Re: CDM1250 No Backlight or Other LED's

What is the model number? Do you get a power up tone? Do you get button press tones? Does the radio receive and transmit? Is the LCD out? Are all of the LEDs out, backlight and scan/tx/rx indicators? Do you have another CDM1250 that you can swap heads with? What is your skill level, are you comforta...
by jackhackett
Sat Feb 24, 2018 10:46 pm
Forum: General Motorola Solutions & Legacy Radio Discussion
Topic: CDM1250 Model Number Issue
Replies: 4
Views: 472

Re: CDM1250 Model Number Issue

I ran into a similar problem years back after a radio came back from depot. I can't remember if depot repaired it or if a firmware update did it. If you're able to do a FW update that would be an easy thing to try.
by jackhackett
Sat Feb 17, 2018 2:43 pm
Forum: MotoTRBO Repeaters, Trunking, and Site Infrastructure
Topic: XPR8300/8400 DC mode
Replies: 4
Views: 321

Re: XPR8300/8400 DC mode

Couldn't tell you, depends on the battery. Not something I'm all that familiar with, perhaps someone else here has some experience with them.
If you can, it wouldn't be a bad idea to set it up and try it ahead of time.
by jackhackett
Sat Feb 17, 2018 10:16 am
Forum: MotoTRBO Repeaters, Trunking, and Site Infrastructure
Topic: XPR8300/8400 DC mode
Replies: 4
Views: 321

Re: XPR8300/8400 DC mode

They're designed to use a 12V battery.
by jackhackett
Thu Feb 15, 2018 6:19 am
Forum: General Motorola Solutions & Legacy Radio Discussion
Topic: 1960's 70's and 80's control head ID
Replies: 27
Views: 1782

Re: 1960's 70's and 80's control head ID

For those who didn't notice what was funny about the mic in the Dumont radio picture.. someone put the hangup button on the front.
by jackhackett
Wed Feb 14, 2018 9:34 am
Forum: General Motorola Solutions & Legacy Radio Discussion
Topic: Just Bought a MaxTrac, confused about plug and internal chip.
Replies: 11
Views: 954

Re: Just Bought a MaxTrac, confused about plug and internal chip.

Hello all ! I have a maxtrac 800 that I am trying to get working... When it is powered on it makes to tones (I thought it could be because it was not connecting to control freq) but I used a friends programming software to try and access and change the control freq but when I run the software I get...
by jackhackett
Wed Feb 14, 2018 6:27 am
Forum: General Motorola Solutions & Legacy Radio Discussion
Topic: 1960's 70's and 80's control head ID
Replies: 27
Views: 1782

Re: 1960's 70's and 80's control head ID

NSPD wrote:I’ve never even heard of Dumont but a quick image search yielded this:

http://www.dcaptain.com/radios.htm


Okay, now what's different about the mic in that picture?
by jackhackett
Mon Feb 12, 2018 6:20 am
Forum: General Motorola Solutions & Legacy Radio Discussion
Topic: Motorola Mic wiring
Replies: 1
Views: 381

Re: Motorola Mic wiring

Generally, Motorola mics don't use a separate power connection, and they don't use 12 volts. They use somewhere around 8 or 9 volts connected to MIC HI through a resistor. Some of them also do not use a straight switch contact for PTT either, they use electronic switching. It's possible to do, but w...
by jackhackett
Mon Jan 29, 2018 4:19 pm
Forum: Motorola Digital Radio Compatability
Topic: Help With Injecting Audio into a GM300 for a DMR Repeater
Replies: 3
Views: 689

Re: Help With Injecting Audio into a GM300 for a DMR Repeater

You can get the GM300 manual from the repeater builder site. It comes in 5 sections, you want to look at part C. Find the HLE8300 board layout, and on the component side look at the top right section, you should find those resistors and cap there. They have the A version board, hopefully the B versi...
by jackhackett
Mon Jan 29, 2018 3:43 am
Forum: General Motorola Solutions & Legacy Radio Discussion
Topic: Just Bought a MaxTrac, confused about plug and internal chip.
Replies: 11
Views: 954

Re: Just Bought a MaxTrac, confused about plug and internal chip.

It's hard to say what the connector is for without seeing what it's connected to. It could be for an external switch to turn the encryption on, or it could be for something else.
by jackhackett
Sat Jan 27, 2018 10:16 pm
Forum: General Motorola Solutions & Legacy Radio Discussion
Topic: Just Bought a MaxTrac, confused about plug and internal chip.
Replies: 11
Views: 954

Re: Just Bought a MaxTrac, confused about plug and internal chip.

And yes I bet previous postee RadioSouth is correct radios set up for ignition sense so apply positive power as normal plus jumper a wire from pos input to rear pin 16 and see if it doesn't power up. Do NOT connect power to pin 16 on the accessory connector. Ignition sense input on a Maxtrac 16 pin...
by jackhackett
Tue Jan 16, 2018 11:18 am
Forum: General Motorola Solutions & Legacy Radio Discussion
Topic: Spectra 146-174 110w capacitors
Replies: 21
Views: 1817

Re: Spectra 146-174 110w capacitors

I believe Will used to do Spectra repairs. but it says he was last active on here in May of 2016.
by jackhackett
Fri Jan 12, 2018 8:51 pm
Forum: General Motorola Solutions & Legacy Radio Discussion
Topic: Spectra 146-174 110w capacitors
Replies: 21
Views: 1817

Re: Spectra 146-174 110w capacitors

Don't recall if I ever had to take one off. I think the cage tended to keep the leakage out of that section.
by jackhackett
Fri Jan 12, 2018 10:52 am
Forum: General Motorola Solutions & Legacy Radio Discussion
Topic: Spectra 146-174 110w capacitors
Replies: 21
Views: 1817

Re: Spectra 146-174 110w capacitors

Measure the voltage on the pot, it's been a while since I've done one but if I remember correctly if you touch your meter probe to the metal adjustment part of the pot you should see something like -3V. The pot gets negative bias through the surface mount resistor next to that caged in section. The ...
by jackhackett
Fri Dec 22, 2017 7:21 am
Forum: ASTRO25 Series (XTS/XTL 1500/2500/5000) Subscribers
Topic: Microphone Pinout?
Replies: 4
Views: 390

Re: Microphone Pinout?

Okay, it looks like my info was from the wiring for the HMN1090 microphone used on XTL radios. Those mics do have the white wire (pin 10) and the black wire (pin 5) connected inside the cable. Inside the mic black is mic_low and white is ptt_low.
by jackhackett
Thu Dec 21, 2017 6:19 pm
Forum: ASTRO25 Series (XTS/XTL 1500/2500/5000) Subscribers
Topic: Microphone Pinout?
Replies: 4
Views: 390

Re: Microphone Pinout?

Hmm... I'm wondering about that pin 10 now, my other pins matched fineshot's but not that one. I had drawn up a diagram of it a few years back, don't remember where I got the info. Maybe it was for a TRBO mic. Will look into it. Stick with 5 for ground/mic lo/ptt lo then, that should be safe. Wish I...
by jackhackett
Thu Dec 21, 2017 11:10 am
Forum: ASTRO25 Series (XTS/XTL 1500/2500/5000) Subscribers
Topic: Microphone Pinout?
Replies: 4
Views: 390

Re: Microphone Pinout?

Here's what I have for it... Pin 2 - PTT Hi Pin 5 - Gnd/Mic Low Pin 7 - Mic Hi Pin 9 - HUB Pin 10 - PTT Low The microphones usually have 5 & 10 connected inside the cable plug. If you look at the socket from the front of the radio you should see a 1 with a arrow pointing to the top left pin, tha...
by jackhackett
Tue Nov 21, 2017 8:42 pm
Forum: General Motorola Solutions & Legacy Radio Discussion
Topic: CDM1550 Remote Head Issue
Replies: 6
Views: 873

Re: CDM1550 Remote Head Issue

The board just kind of snaps into the head, then the remote kit adapter should hold it in place. It can be a bit tricky the first time you do one, the board will sometimes pop out a bit when you try to put the head onto the remote kit or the radio. You have to makes sure the board is seated all the ...
by jackhackett
Wed Nov 15, 2017 12:56 pm
Forum: General Motorola Solutions & Legacy Radio Discussion
Topic: GM300 Mod levels
Replies: 1
Views: 485

Re: GM300 Mod levels

There should be two pots on the RF board, R164 for Reference Mod and R302 for VCO Mod. You may just have to adjust them, but if someone did a conversion on it they would probably have changed some of the associated fixed resistors. As I recall they didn't generally go all the way down to 2.5kHz with...
by jackhackett
Fri Aug 25, 2017 7:04 pm
Forum: General Motorola Solutions & Legacy Radio Discussion
Topic: CDM 1550 lights not working at all
Replies: 8
Views: 759

Re: CDM 1550 lights not working at all

Sorry, I did try to post a picture, but apparently photobucket won't let you share pictures without paying anymore(at $40/month... not going to happen), and batboard has no way to upload pictures. I'll see if I can figure something else out.
by jackhackett
Thu Aug 24, 2017 3:33 am
Forum: General Motorola Solutions & Legacy Radio Discussion
Topic: No TX PL on GM300
Replies: 6
Views: 717

Re: No TX PL on GM300

Have you tried hitting the repeaters with the HT or another radio to verify that the problem is in the GM300?
Are the repeaters 12.5KHz narrowband?
by jackhackett
Tue Aug 22, 2017 6:26 pm
Forum: General Motorola Solutions & Legacy Radio Discussion
Topic: CDM 1550 lights not working at all
Replies: 8
Views: 759

Re: CDM 1550 lights not working at all

This should be where the fuse F0401 is, near the connector that the control head plugs into. It's a 3A surface mount fuse. It can be tested with an ohmmeter (with power disconnected from the radio of course).

Image
by jackhackett
Sun Aug 20, 2017 8:18 am
Forum: General Motorola Solutions & Legacy Radio Discussion
Topic: CDM 1550 lights not working at all
Replies: 8
Views: 759

Re: CDM 1550 lights not working at all

The location of that fuse depends on which circuit board the radio has. Can you tell us the model number of the radio?
by jackhackett
Sat Aug 19, 2017 5:36 pm
Forum: General Motorola Solutions & Legacy Radio Discussion
Topic: CDM 1550 lights not working at all
Replies: 8
Views: 759

Re: CDM 1550 lights not working at all

The three most likely things are: 1) Radio programmed for 'follow ignition only' and no ignition sense connected. 2) Bad reference oscillator. The 16.8MHz oscillator goes bad and the radio will not power up. 3) Blown control head power fuse. Small surface mount fuse or some cases a thin circuit boar...
by jackhackett
Sat Aug 12, 2017 6:35 pm
Forum: MotoTRBO Portables and Mobiles (3xxx/5xxx/7xxx/SL) 2.0 Series Subscribers
Topic: XPR5550e mobile
Replies: 6
Views: 663

Re: XPR5550e mobile

What is the output power of the control station (base), what does it have for an antenna, and how close to the repeater is it located? You may be de-sensing the repeater if you have too much signal from the control station.
by jackhackett
Sun Aug 06, 2017 12:29 pm
Forum: General Motorola Solutions & Legacy Radio Discussion
Topic: Maxtrac PA board damage-Reverse Polarity diode?
Replies: 6
Views: 684

Re: Maxtrac PA board damage-Reverse Polarity diode?

I've seen those diodes fall apart like that many times. I think it's more from vibration than anything else, because they usually still checked okay with a diode tester. They're not just a regular diode, they're a TVS (Transient Voltage Suppressor) diode, they protect against both reverse polarity a...
by jackhackett
Fri Aug 04, 2017 5:17 am
Forum: General Motorola Solutions & Legacy Radio Discussion
Topic: CDM1550 - switchable 3dB pad - does this exist?
Replies: 4
Views: 626

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

I don't believe they have a local/dx setting.

I've been working with CDMs for a long time, never came across anything about an attenuator and never had any need for it. My advice would be don't worry about it, it's probably something internal that you have no control over.
by jackhackett
Wed Aug 02, 2017 3:38 pm
Forum: General Motorola Solutions & Legacy Radio Discussion
Topic: CDM1550 - switchable 3dB pad - does this exist?
Replies: 4
Views: 626

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

However, I can find no mention in the CPS about a switchable attenuator pad option.


Have you looked in the Tuner software?
by jackhackett
Wed Aug 02, 2017 9:03 am
Forum: General Motorola Solutions & Legacy Radio Discussion
Topic: Microphone compatibility Inquiry
Replies: 17
Views: 1205

Re: Microphone compatibility Inquiry

I'm not sure that a Motorola mic would be compatible with a Yaesu radio without some modification. The Moto mics are powered by voltage on the 'MIC HI' audio lead (sort of a phantom power arrangement), while from what info I can find on them Yaesu mics have a separate power (+9volt) connection. If s...
by jackhackett
Mon Jul 24, 2017 9:06 am
Forum: ASTRO25 Series (XTS/XTL 1500/2500/5000) Subscribers
Topic: XTL1500 - do you need red ignition sense cable?
Replies: 11
Views: 965

Re: XTL1500 - do you need red ignition sense cable?

From the Basic Service Manual:
"The audio PA is a bridge amplifier with a 3.2-ohm minimum impedance"

The internal speaker is 20 ohm / 4W.
by jackhackett
Sun Jul 23, 2017 10:21 am
Forum: ASTRO25 Series (XTS/XTL 1500/2500/5000) Subscribers
Topic: XTL1500 - do you need red ignition sense cable?
Replies: 11
Views: 965

Re: XTL1500 - do you need red ignition sense cable?

If you are really worried about it, go buy a pin tool, and take the speaker out of the accy plug. There should be a molex type quick disconnect plug on the speaker leads, you just need to unplug it. According to the spec sheets and installation instructions (both available online, GIYF) the XTL1500...
by jackhackett
Mon Jul 17, 2017 6:44 pm
Forum: ASTRO25 Series (XTS/XTL 1500/2500/5000) Subscribers
Topic: XTL5000 2.85v regulator issue
Replies: 3
Views: 538

Re: XTL5000 2.85v regulator issue

If all three are low something would have to be loading each of them down, the one place I see them all connected appears to be at the main processor.
by jackhackett
Mon Jul 17, 2017 5:07 am
Forum: Motorola CP/CM Series Subscribers
Topic: CM300 ToT
Replies: 5
Views: 655

Re: CM300 ToT

Okay, now that I have access to my CPS I can see what's going on. Under 'Programmable Menu' there's a Time Out Timer setting that goes from 1 to 30, this is for the menu time out. Under each personality there are two Time Out settings: 1) Time Out Timer (15 seconds to infinite) will select the trans...
by jackhackett
Sun Jul 16, 2017 7:14 pm
Forum: Motorola CP/CM Series Subscribers
Topic: CM300 ToT
Replies: 5
Views: 655

Re: CM300 ToT

I think if you set it to zero seconds it disables it, I can check for sure on Monday. You can also try looking in the CPS 'help', it should give that information.
by jackhackett
Sun Jul 16, 2017 5:58 pm
Forum: ASTRO25 Series (XTS/XTL 1500/2500/5000) Subscribers
Topic: XTL5000 2.85v regulator issue
Replies: 3
Views: 538

Re: XTL5000 2.85v regulator issue

Looking at the schematic, I see a couple of things to consider... I don't see where the other regulators are enabled by the 2.85V one, they all appear to be independent except that their /error outputs are tied together. How low are they? You say the filtered 5V (VCC5_FILT) is low, you think maybe b...
by jackhackett
Sun Jul 02, 2017 7:46 am
Forum: ASTRO25 Series (XTS/XTL 1500/2500/5000) Subscribers
Topic: MT1500 Electrical Requirements?? Voltage and AMP Draw
Replies: 2
Views: 504

Re: MT1500 Electrical Requirements?? Voltage and AMP Draw

From the Basic Service Manual...

Nominal Voltage - 7.5 volts
Range - 6 to 9 volts

Transmit Current Drain (Typical)
700/800MHz - 1250mA
VHF - 1900mA
UHF Range 1 (380-470MHz) - 2100mA
UHF Range 2 (450-520MHz) - 2000mA

Receive and Standby currents are around 220mA and 80mA

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