Parts needed for GP300/P110 ( 25 to 12.5 conversion )

[EKLB]

MOTOROLA GP300 / P110 UHF OR VHF 2/8/16 CH PORTABLE 25 KHZ to 12.5 KHZ CONVERSION INFO AND INSTRUCTIONS.

Motorola has a complete 25 to 12.5 khz conversion kit available for the GP300 and P110 and the part number is HLN-9578A

Its cost is approx 55.00 (December 2003)

This conversion kit covers both the GP300 / P110 portable in both VHF or UHF bands .

This package contains 7 parts bags with each bag containing a part for conversion of 25 to a 12.5 narrow band version portable as the end result.

According to the parts and instruction sheet supplied with the conversion package= the following info applies.

Im going to put on the left side of the screen whats in a GP300 / P110
25 khz radio and whats in the 12.5 khz on the right side.

So you remove the left side component and install the right side component to convert from 25 khz to 12.5 khz or vice versa if your converting back from a 12.5 to 25 khz.

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25 khz component 12.5 component

Bd part # M part# Bd part # M part #

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Part #1

C63T 21-13740A48 C63T 21-13740A52
(51pF) (75pF)

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Part #2

C64B 21-13740A72 C64B 21-13740A79
(510pF) (1000pF)

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Part #3

CF51T 91-80098D06 CF51T 91-80098D04
(455 Khz 4D) (455 Khz 4F)

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Part #4

CF52T 91-8009D05 CF52T 91-80098D03
(455 Khz 4E) (455 Khz 4G)


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Part #5

R59B 06-60076A93 R59B 06-60076A96
(68k ohm) (91k ohm)

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Part #6

R60B 06-60076A70 R60B 06-60076A73
(7.5k ohm) (10 k ohm)

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Part #7

R69B 06-60076A73 R69B Not Used Remove
(10k ohm)

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Part #8

Y51T 91-80112R02 Y51T 91-80112R03
(a&b) (45.1 mhz/25 khz) (45.1 mhz/12.5 khz)

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Note :

Parts CF51T and CF52T have a larger foot print than the ceramic filters in the factory built 12.5 khz UHF model radios, to accomodate the diference in solder hole patterns on 25 khz and 12.5 khz circuit bds.

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Sqeulch sensitivityadjustments in the reciever:

Use the GP300/P110 rss and a communications systems analyzer operate it in generate mode.

Connect analyzer to radio through the antenae port with a BNC adaptor.

From the main menu in the rss select F2 (Service radio alignment)

Select F2 (Alignment transmitter and reciever) to select adjustments.

Select F9 (Sqeulch coarse adjustment) Use up down arrow keys to set the sqeulch adjustment to "0" (Open sqeulch)

Apply a modulated signal with a 1 kHz tone at 60 percent (1.5 kHz) of maximum rated system deviation (2.5 kHz) at the freqeuncy displayed at the bottom of the rss "sqeulch screen".

Adjust the RF signal until 10 db sinad is obtained.

Use the up down arrow keys to increase the sqeulch setting until the flashing red LED just goes out.

Reduce the RF signal level to minimum .

Slowly raise the RF signal level until the "Busy" LED indicator just begins to flash and remeasure the SINAD.

If a minimum reading of 9 db Sinad is not obtained , repeat steps 7-8 and 9 above.

Select F10 to return to the alignment ( Transmitter and reciever screen )

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Transmitter adjustments :

For the transmitter measurements use the communications systems analyzer in monitor recieve mode.

The rss will be used to redefine the radio as 2.5 kHz maximum deviation.

Connect the 1kHz audio oscillator output of the analyzer to the mike jack of the GP300/P110

Select F2 (Level set adjustment )

Press tab on your computer key bd to move cursor to the "system deviation" = high light.

Use the up down arrow keys to select 2.5 kHz.

Select F6 (Toggle PTT) to key the radio .

Adjust the level of audio oscillator to 70 mV rms.

Measure the deviation of the 1 kHz tone.

Select F6 to dekey the radio.

If the deviation is between 2.1 kHz and 2.3 kHz (Without coded sqeulch).

Select F10 (Exit) and skip the rest below with the exception of escape to main menu and exit because you are now done.

If you did not get the above reading then= select F3 (Deviation) and continue.

Select F6 to key up radio.

Use the up down arrow keys to change the deviation to 2.1 to 2.3 kHz.

Select F6 to dekey radio.

After getting the 2.1 to 2.3 kHz measurement Select F10 to exit to main menu and out= because you are now done with the conversion process.


Good Luck And May The Solder Be With You !

EKLB

[EKLB]

Well shoot me dead:

Take all the time to type this above out with a space between the left and right components and post it and the spacing is removed and runs it together and no edit option seen after doing so leaving it as is.

Anyway when you look at the above info you see example C63T with info after it then you will see the C63T again .

First C63T is the Left info for 25 kHz and when you see the second C63T this is the right 12.5 kHz info.

Probably a good thing for those of you that really want the info as i would have deleted it rather than fight the stupid computer.

Anyway you all have a good day.

EKLB

[EKLB]

Also the left (51pF) is 25Khz And the right (75 pF) is the 12.5kHz component= they also ran these two together so you need to visulize in your mind that these are to be spaced apart also.

Hope this all is clear to you guys/gals as i dont wish to confuse you thus causing a problem.

EKLB

[Crimestopper]

Sorry to sound negative, but after cost and labor, would it be advantageous to purchase a newer style radio such as the CP200 and sell the GP on Ebay. I have a fleet of 50 GP's and I'm still not sure what to do, then again, I'm ok with the FCC on 25 khz for my rental fleet.....correct me if I'm wrong...just a suggestion.

Be Well
Crimestopper

[Susan157]

This Info Was Easy To Follow.Thanks.

This Is Still Cheaper To Do The Mods.
( That Is If You Have The Service
Equipment).

All The Extras Are Still Used.
Batteries,Ant,Chargers,Mics Etc.
Most Boys Forget This Issue.

( We Look At Cost All The Time.)

Remember This Forum
Was For Servicing Motorola Radios.

( Now We Have Many End Users
On The Site And A Couple Of Losers)

WELL IT STILL IS A GREAT SITE
KEEP UP THE SUPER WORK.

Susan157

From The Great White North (Canada I Mean)

[WalkieTalkie]

I purchased a narrow banding kit with the intentions of converting one of our farm Maxtrac/Radius UHF radios to 12.5 KHz. I have opened two of our radios so far and both have had a RF board version that was older than recommended per the kit instructions. When I go home in a few weeks I will open more radios to see how many, if any, are new enough to accept the kit. Has anyone attempted to install a kit on an older RF board? Any thoughts?

[WB6DGN]

SORRY! I apologize. Was a very bad day; should have stayed off of the internet.
Tom

[WB6DGN]

I purchased a narrow banding kit with the intentions of converting one of our farm Maxtrac/Radius UHF radios to 12.5 KHz. I have opened two of our radios so far and both have had a RF board version that was older than recommended per the kit instructions.

Simple! If that board is not listed as applicable for the kit, contact Motorola to see if a kit is available for the board you have. If not, that radio cannot be modified. It has nothing to do with whether that radio is technically capable of being modified or not. It has EVERYTHING to do with whether the manufacturer applied for an STC for that model or not. For the most part, this is more of a "paperwork exercise" than a real technical modification but the paperwork is the rule and must be complied with. NO STC, NO GO!

[Jim202]

One of the other BIG issues is that the skill of the average "bench technician" today has been reduced to board
swapping. It is the rare shop that has a skilled "bench technician" that can do surface mount component
replacement and not screw up the circuit traces on the pc board. That skill is not being taught today in any shop
I know of. If the person coming in the door doesn't have good soldering skills and surface mount replacement
skills, the shop is not going to pay for that person to go to school and learn it.

Now I am sure there is the rare shop management that will send a person to a class to learn the surface mount
skills and purchase the needed tools / equipment to do the repairs. But for the most part, if the circuit board has
a problem, it will be sent back to the plant for repair or replacement. To replace an individual surface mount
component today is an very rare case. Even replacing a tuning coil or a switch is almost unheard of. It just
doesn't happen anymore as a norm. The labor cost is too high for it to be done as a normal repair.

Jim

[wavetar]

MUCH ADO ABOUT NOTHING!
I went through the last "narrow banding", (15kc to 5 kc). Converted literally hundreds of radios. NOT A BIG DEAL. Followed the manufacturer's instructions. It worked EVERY time. Now I'm retired and don't have to deal with this round of changes but I watch the comments and whining on a regular basis. Can't believe what I read. THIS IS NOT ROCKET SCIENCE, folks! Change the parts, align the radio as needed and GET IT BACK TO THE CUSTOMER. Simple as that! What would you folks do if you had to do a REAL mod.? If the FCC ever mandated ACSB to replace FM,(wishful thinking, I fear), McDonalds would have a whole new work force waiting in the wings. GOOD GRIEF!!!

Agree with you Susan, I had NO trouble understanding what the OP was saying.

You realize you're ranting about a 7-year old thread, right?

[Satelite]

Hello:
So someone used the search feature and found a thread that dealt with his problem and now just because its seven years old and the narrow band rule is now just around the corner you make a comment about thread being 7 years old ?
I believe the postee gave an answer as to how easy the conversion can be done.
Granted the person doing the mod will need soldering abilties but that doesnt mean every ones answers were not valid info in one way or another.
Satelite

[wavetar]

Hello:
So someone used the search feature and found a thread that dealt with his problem and now just because its seven years old and the narrow band rule is now just around the corner you make a comment about thread being 7 years old ?

No, we encourage the use of the search feature, and resurrecting old threads is not an issue...as long as it's to give useful information. I was simply pointing out that his rant was a little out of place, due to the age of the original posts, and the fact that nobody was complaining about how difficult the mods were...just one question about the compatibility of it with a particular model radio.

[Satelite]

Chalk another one up for Wavetar.
Couldnt leave well enough alone.
Had to upset WB6DNG to the point he felt like it was a bad day and should have stayed off the interenet.
I myself do not see where a thread seven years old had anything to do with his rant as you called it.
I call it a coment .
He didnt reply to the original part of the thread that was seven years old .
He relplied to a present day thread that was posted December 6 2010.
The way i see it you took offense to his reply and posted back at him over it.
I took offense a administrator stepped in with no good reason and posted back at him.
He had the right to speak his piece and he did so.
Perhaps you too had a bad day.
Ill let it go from here on as long as you do the same.
Satelite

[wavetar]

You have a point, he didn't resurrect the thread, he responded to the new post. Still, his response to the new post was way out of line...it would belong in the lounge, if we still had one. It was not helpful and was designed to belittle the poster. It's not just a 'comment', as you say, it's a flame.

I'd hardly say I brought the hammer of justice down...simply pointed out it was a rant. He realized it, you don't. That's fine, we all have our opinions. Thanks for sharing yours.

[Satelite]

Hello:
Thats the biggest load of crap i have heard.
Satelite

[FatBoy]

Not to add fuel to the fire, but I am sure this mod will not be a valid alternative to 2013 narrownbanding. FB

[WalkieTalkie]

I had no idea my post would draw such a response. .

I posted to draw on the knowledge and experience of technicians who have narrow banded Maxtrac radios. I am not an experienced technician; I will be the first to admit. I am a college student working through school at a MSS radio shop. I am actually an installer, but I enjoy tinkering with radios. I recently took a communications systems course and I find radio to be very interesting. I though this project (narrow banding my family farm’s small fleet of about 15 radios) would be a good learning experience. I turned to this forum because I felt like I could find someone who would tell me that would or would not work. Someone who actually knew if the kit I bought could half the deviation of my radio. I am performing the work for myself, not for customers, so I am not terribly concerned with red tape.

The frustrations vented in the above post are well founded. The shop I work at is a satellite shop. We only have one trained technician, he is also our shop manager, and he stays busy on the road. Most of the board-level, and all of the component-level work my company does is done at the main shop. I am very aware of the talent drain occurring in the radio business. We could spend all day discussing the causes. It is unfortunate. Maybe when all of this radio-replaceing grant money runs out things will change.

WalkieTalkie

[desperado]

question, does it make it a TYPE ACCEPTED narrow band radio according to the FCC?
Most radios can be converted to narrow band, and meet spec, but the FCC ID number on it is what they are going to go by from what I understand.

Thanks in advance

[com501]

From what I have read, if it isn't programmable that way, it isn't going to be type accepted after the cutoff, no matter how much you hack the circuit board.

The goal here is to replace old radios with newer ones, folks. That's what the manufacturers want to do.

I just scrapped 165 GP300s, 12 repeaters and p/o'd a whole bunch of volunteers on one of my systems, because we went completely capacity plus trunking in one swoop. eBay is too much of a pain. These all get the firing range treatment this summer.

[Motoboy]

I have talked to the FCC regarding narrowband conversions because I have a customer with several MSR2000's. The rule is that each individual piece of equipment that is converted needs to be type accepted on its own merits. If you convert 1000 pieces of equipment, all 1000 would need to be inspected and accepted by the FCC. Not really feasible if you ask me.

Also, I'm glad some people are finally being forced to buy new equipment. It's getting harder and harder to find parts for Maxars, Moxys and Motracs. We have scrap piles (the leading "s" is silent) that we rob parts off of, but there is no guarantee that the junk radio didn't have the same problem as the radio in for repair. Especially when the radio was discontinued while the technician was still in diapers. I do, however, pride myself on being able to repair to the component level, while most techs in my age group are either installers or module replacers.

/\/\b

[com501]

I miss tubes....

[AEC]

I surely do not miss tubes!
I don't miss the H.V lines, the multiple screen/grid voltages, the ground strapping and of course, the sockets/chimneys and plate lines..
Drop a ccostly planar triode, and there goes some good $$ down the tube, let alone fire it up with an improper voltage on the grid/heater.

I am happy I no longer have to watch out for errant 5KV+ levels...I'm not fencing in cattle here guys!

I love LV circuit traces, transistor voltages, negative biasing...oh so much nicer and simpler to live with.

Hmmm...any .5 Kelvin N.F tubes out there for my X-band preamp?
NOPE!

[Al]

"any .5 Kelvin N.F tubes out there for my X-band preamp?"

That's why we had parametric amplifiers back in the day!