Step 6: Carefully remove the board from the casting and flip it over. The ESN chip is seen above the three battery contacts. This is what needs to be swapped.
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Is it still possible to add features to a M7100?
- Thread starter neilster1
- Start date
Step 6: Carefully remove the board from the casting and flip it over. The ESN chip is seen above the three battery contacts. This is what needs to be swapped.
Step 7: Remove this DS2401 chip. This is your target. If you do not have a hot air desoldering station, I recommend that you applly excess solder and float it off the board. Do not force it. If you're pushing harder than you would push a dime across a table top, you are applying too much force.
Reverse the process to reassemble.
Use the Radio Maintenance Tools to swap the feature string.
Use the Radio Maintenance Tools to swap the feature string.
BMDaug
I am licensed…
M7100 uses the same chip right? I know OP has a mobile, but they can still use a portable as a donor… right?
-B
Yes, the M7100 uses the same chip and has a compatible feature string length. All "40 option capable" Harris/Macom/whatever radios use this chip and have compatible feature string requirements. The previous generation,700P, LPE200/50, MRK, etc are 32 option capable and use the same chip but a shorter assigned feature string. You COULD swap one of those but what's the point?
A further follow-up with the shop confirmed that Harris is no longer providing feature updates for M7100 mobiles/P7100 portables (or anything else of that vintage).
Unless someone has figured out a way to generate feature strings, Elroy's procedure for swapping DS2401 chips is the way to go.
My copy of the feature guide (which I BELIEVE to be current) shows that any radio down to the LPE-200 and Orion can still get feature upgrades from Harris. I'm sure Harris will be happy to take a significant amount of cash out of your wallet just for a minute's worth of work with the feature encryption generator application.
If they've discontinued additional model support, I'll expect a new feature guide to be released any day now.
If they've discontinued additional model support, I'll expect a new feature guide to be released any day now.
The problem here is the XTL is not compatible with the M7100. No, that won't work.
Swapping the ESN chip and string from the 800 Mhz to the VHF will work.
Give me the part number of either the original chip or the blanks you are seeking. I've got some resources and friends with resources, any of us might be able to help.
BMDaug
I am licensed…
nr0x
Member
Do you still have a radio like that lying around that I could buy from you? I would like to do the same thing. Actually, I'm working on a way to "emulate" a DS2401 chip in a way that can be duplicated for more than one radio. I just don't have a chip with p25CAI on it to get the data from. If you still have one, I'd be interested in buying it from you.
Nope. Figuring how to generate feature strings has been a thorn in my side for many years. Even Harris does not 'generate' them.
The use a spread sheet of every radio that left the plant
You find one of those one wire chips that are programmable in the first bank, I have what is needed to enable ALL the features.
Still, the easy way is the chip and string swap.
It's a matter of semantics. The feature string exists by virtue of the radio having firmware in it. That feature string begins as a bunch of zeroes. 00 00 00 00 00 00 00 00 00 00 00 etc.... and the ESN of the installed DS2401 chip is a factor in the encryption system that is manipulated by features chosen, which creates a new string that is then loaded into the radio. So Harris does generate a new version of the string based on that data. But they don't start with a blank radio that has NO string. That string is already there, it's just a bunch of zeroes when the radio is born.
I have a box full of them I need to rid, I just need to see if any have the CAI option. (don't hold your breath).
That could be done with Arduino but outbord and you got a Frankensteine radio.
OK, I only have one radio with option 33, P25 CAI support (APCO-25 Conventional Only)
You might want 32 FIPS140-233P25 Common Air Interface (CAI)–P25 Conventional
Radio works, 800 MHz, complete.
nr0x
Member
What do you want for it?
