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900 MHz Ham Band Mods for Astro25 Radios CPS By Lou Meiss WA6EPD

General Information:

I've used the Hex Workshop program for editing. All of the values are 8-byte, unsigned long, Intel format.

The Astro 25 Portable CPS covers models XTS5000, XTS4000, SSE5000, XTS2500, XTS2000, ATS3000, XTS1500, MT1500, and PR1500 Radios.

The Astro 25 Mobile CPS covers models XTL5000, Astro Spectra Plus, XTL2500, XTL1500, and PM1500 Radios.

Here are the latest Offset addresses. Other versions may have different Offset addresses, but the search info will be the same. Remember that in the Receive search, ONLY CHANGE the LAST 5 addresses that are found. This applies to both Portable and Mobile files; patport.exe and patmob.exe located in the install directories:

C:\Program Files (x86)\Motorola\ASTRO 25 Products\ASTRO 25 Mobile CPS\) and
C:\Program Files (x86)\Motorola\ASTRO 25 Products\ASTRO 25 Portable CPS\).

The trick is when using Hex workshop to do a "Save As" and save the modified exe as patport.new. Exit Hex Workshop, rename the original exe to patport.old then rename the new file back to the patport.exe. For the mobile version, modify the file named patmob.exe instead of patport.exe

You are changing the receive and talk/around frequency range from 935 to 941 MHz down to 926 to 941 MHz. If you need to go lower, you can use a different starting frequency value.

You are changing the transmit frequency range from 896 to 902 MHz up to 896 to 904 MHz. If you need to go higher, you can use a different ending frequency value.

These same values can be found in other CPS versions but the addresses will be different.

For Portable CPS Version R.20.01.00:

Receive: Search for 935.0125 (9428BB37 HEX) and replace with 926.0125 (54D43137 HEX) in 5 addresses starting at 01200DDC.

Transmit: Search for 901.9875 (AC3CC335 HEX) and replace with 903.9875 (2CC1E135 HEX) at one address 01200CE8.

For Mobile CPS Version R.20.01.00:

Receive: Search for 935.0125 (9428BB37 HEX) and replace with 926.0125 (54D43137 HEX) in 5 addresses starting at 0139D80C.

Transmit: Search for 901.9875 (AC3CC335 HEX) and replace with 903.9875 (2CC1E135 HEX) at one address 0139D718.

Contact Information:

The author can be contacted at: lmeiss [ at ] cox [ dot ] net.

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This page originally posted on Wednesday 12-Aug-2020.

This web page, this web site, the information presented in and on its pages and in these modifications and conversions is © Copyrighted 1995 and (date of last update) by Kevin Custer W3KKC and multiple originating authors. All Rights Reserved, including that of paper and web publication elsewhere.