MX prom replacement

[radioman2001]

I don't know why I am going this route, might be because Dayton coming up. I have seen and cannot find a post here or somehwere else where the Motorola MX prom was replaced with another prom using the original one for contacts. Anyone else seen this method?


Found it
MX300

 

[RFI-EMI-GUY]

I don't know why I am going this route, might be because Dayton coming up. I have seen and cannot find a post here or somehwere else where the Motorola MX prom was replaced with another prom using the original one for contacts. Anyone else seen this method?

It was from an Australian website.

Sent from my SM-T350 using Tapatalk

 

[RFI-EMI-GUY]

This should get you in trouble. This guy did it and I archived his stuff . It would seem to me that a reprogrammable EEPROM could be fitted right inside the old codeplug thus converting A and B proms to C or D versions. I am finding that virtually all the old MX 300-S I find are missing the codeplugs entirely. I am kicking myself for pitching my MX300 stuff a decade ago now that I embarked on a PX-300S 48 channel GMRS radio escapade.

There is a zip file with VHF code plug conversions so I will send that next.

Index of /v/vk1krf//MX300

MX300

 

[RFI-EMI-GUY]

this might help. Hope a zip file isn't a banned upload.

 

[RFI-EMI-GUY]

shoot I should have read your edit where you found it. Anyway all here for the next MXfool!

 

[jiminpgh]

The MX radio is the best radio ever. The saber is a close second. I got several MX-300-S programmed here:
Brinkley Electronics Home Page

 

[cmdrwill]

Brinkley Electronics, Andy IS the go to guy.

 

[radioman2001]

I have the suitcase, but have way more radios than "C" or "D" eeproms. I bought about 40 of them when they were still available back in 1995. I had to convert about 20 WHCA radios for marine use ( for use by a riverboat restaurant, a floating crap game I called them), and I also have from some Govt auctions a collection of "A" and "B" as well the "B" are the least useful as I don't have the correct adapter, I tried modifing a second "A" adapter I had but it never worked correctly hence the wanting to use an external prom.

If any ones interested I have 2 brand new keypads for the programmer, I bought one for a spare and the guy threw in 2 others for a real good price.

 

[RFI-EMI-GUY]

I have the suitcase, but have way more radios than "C" or "D" eeproms. I bought about 40 of them when they were still available back in 1995. I had to convert about 20 WHCA radios for marine use ( for use by a riverboat restaurant, a floating crap game I called them), and I also have from some Govt auctions a collection of "A" and "B" as well the "B" are the least useful as I don't have the correct adapter, I tried modifing a second "A" adapter I had but it never worked correctly hence the wanting to use an external prom.

If any ones interested I have 2 brand new keypads for the programmer, I bought one for a spare and the guy threw in 2 others for a real good price.

I agree these radios were great performers.

I wonder if there is a suitable small outline eeprom that could be soldered directly to the circuit board? Maybe it might need some skills but it would be nicer than bringing out a ribbon cable and finding room in the housing.

I have a later model DEA MX300 that has a 16 position knob (stopped at 12) and a 3 ABC position toggle. So though this is a 36 channel radio (with scan) it appear that 16 x 4 (ABCD) = 64 channels can be built out. The trick is that in the previous radios a bi-level DC shift was used to multiply the positions on the rotary knob and only a portion were used bi-level. So the new radios use all the knobs data lines with bi-level data.

This implies the codeplugs have more capacity than utilized.

Next time you have that programmer plugged in type QUALITY in the field for running the applications and tell me what it does!

 

[radioman2001]

Quote"
Next time you have that programmer plugged in type QUALITY in the field for running the applications and tell me what it does!

I will have to dig it out again my wife told me to get it off the dinning room table, along with the dozen or so radios. What other Easter Eggs are there? I was wondering the same thing about some other EEprom fitted to the location where the old die was that maybe can be programmed with a laptop instead of the R1800. Something I should look into too thanks for the idea.

I have one similar from DEA but it is totally blown out, DES, Scan and 64 channels in subdue face, with the ABCD switch and 3 position PL/ secure/ scan switch. I can just imagine what it cost us taxpayers for that radio ( speaking of costs I found old documentation for the MX-R for Navy Seals and those radios ran about 4K each in the 80's). I know you have to specify the numer of channels when you power up the later version programmer using C and D proms to get the 16 channels. the A,B version doesn't give you that option. That bi-level switch sound familiar to what is used in the RR Spectra, getting 99 channels out of 4 control lines.

 

[RFI-EMI-GUY]

Quote"
Next time you have that programmer plugged in type QUALITY in the field for running the applications and tell me what it does!

I will have to dig it out again my wife told me to get it off the dinning room table, along with the dozen or so radios. What other Easter Eggs are there? I was wondering the same thing about some other EEprom fitted to the location where the old die was that maybe can be programmed with a laptop instead of the R1800. Something I should look into too thanks for the idea.

I have one similar from DEA but it is totally blown out, DES, Scan and 64 channels in subdue face, with the ABCD switch and 3 position PL/ secure/ scan switch. I can just imagine what it cost us taxpayers for that radio ( speaking of costs I found old documentation for the MX-R for Navy Seals and those radios ran about 4K each in the 80's). I know you have to specify the numer of channels when you power up the later version programmer using C and D proms to get the 16 channels. the A,B version doesn't give you that option. That bi-level switch sound familiar to what is used in the RR Spectra, getting 99 channels out of 4 control lines.

I will save you the drama as I thought you had it plugged in nearby. If you type in QUALITY it will come back and tell you "QUALITY - NOT FOUND". Just as if you typed MOSTAR and did not have the firmware for MOSTAR.

I am trying to figure out why the DES module in my DES MX300-S has an SP number on it. Did DES-XL ever ship in MX300-S?

 

[radioman2001]

As far as DES-XL not that I am aware of, but with M and their SP programs it could be just a jumper thing. The only way "might" be able to tell is disassemble the module and look at the hybrids on the inside. As I remember there was 2 square hybrids for DES-XL and one for DES only on the Syntor/Syntor X series.