Hacking / Programming the Olympia P324 Business band UHF radio

This is the new Olympia P324 business band UHF radio:

I found out about this radio when I was looking for a GMRS radio that was small, light, cheap and easy to use. It was just released early in 2009 to my knowledge, and no/very little info is out about it. This is the first aftermarket website about the radio on the internet. I decided to order one and have had great results so far.

This radio is a Part 90, not Part 95 (GMRS requirement) radio, and therefore is not legal for use on GMRS frequencies. The general thought seems to be that since Part 90 radios meet or exceed all of Part 95 requirements, there should be no reason that one cannot use this on GMRS frequencies as long as it is not used on FRS frequencies (where it may be exceeding power limits).

The FCC ID is K7GP1808 and according to the FCC this radio can be programmed from 400 to 470mhz.

The details of this radio according to the FCC tests can be found here by entering K7G as grantee code and P1808 as the product code.

When purchasing, please make sure you are purchasing a real authorized programming kit. I first purchased a copy from AntennaFarm and the USB programming cable they provided did not work for me. I sent it back and ordered the proper serial cable programming kit from Amazon and it works great (with some limitations...). If you end up buying this radio, please consider purchasing it from my links above.

The radio weighs exactly 235 grams or 8.3 ounces with battery and belt clip (this is according to my scale, not the product guide).

The software limits the radio from being programmed on certain frequencies, specifically GMRS frequencies but this can be modified.

The modification of the software to allow programming on any capable frequency is quite straight forward.

I downloaded a copy of "Hex Workshop v6". If you open up the .exe (make sure the programming program is not running) and do a "Find", then search for a Little Endian "64 bit double long" of the following: 4625375, 4675375, 4627375 and 4677375. These numbers are of course the GMRS frequencies, where 4625375 is 462.5375 mhz.

I changed these values to a frequency I would not care about being blocked from programming on (i.e. a frequency I would never use). For ease of modification, I changed the 7 in 467mhz to 8, or 468mhz and changed the 2 in 462mhz to 3, or 463mhz.

This change looks something like this:

4625375 as a little endian double long 64: is 0000 0040 F7A4 5141
4635375 as a little endian double long 64 is: 0000 0040 BBAE 5141
(You can get these values by doing a find and then copy/paste the value under "Hex:")

If you notice, only 4 characters or 2 hex blocks of 2 characters each changed.

Here are a couple of images of how you would find and edit these values in the new Hex Workshop v6.6:

Once you have changed all 4 sets of numbers (the upper and lower limit of 462mhz and the +5mhz value for repeater input, 467mhz), save the changes and program.

Other limitations:Apparently valid frequencies fall within 406.1050 and 470.0000 (according to text strings within the programming software). I do not know what runs on 400-406mhz or 454 through 456mhz, but the radio software will also not allow you to program on these frequencies.For 440mhz, this could be a great alternative to other cheap, but non FCC tested radios like Puxxing.

With this change you can successfully program this radio to use GMRS frequencies. A few thoughts: I do not condone the use of Part 90 radios on Part 95 frequencies. More importantly I do not condone the use of any frequency without being properly licensed.

If you do not understand these instructions, e-mail me and I will help.