Making the 900 MHz MTR2000 Operate on the Amateur Band

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Operate on the Amateur Band
By Robert W. Meister WA1MIK

RSS limits the receive frequency to the range of 896 to 915 MHz, so we have to assume that the receiver will operate over that same frequency range.

RSS limits the transmit frequency to the range of 935 to 941 MHz, but apparently the exciter and power amplifier will operate over a larger range. The range values are all stored as 8-byte double-precision values, easily found and changed using most hex editors.

Make a backup copy of MPS.EXE in the MTR2000 folder. Better to have it and not need it than to need it and not have it.

Open the MPS.EXE file. Set your hex editor for "Little Endian / Intel Byte Order".

Search for the 64-bit (8-byte) value 935.000; you should find two locations. The 8-byte value will be:
00 00 00 00 00 38 8D 40
Change these to 925.000 MHz. The 8-byte value will be:
00 00 00 00 00 E8 8C 40

You should also change the ASCII text that describes the frequency range of the station and RSS. In the same file, search for the text "935"; you should find two locations. One will say:
935-941_MHz_75W_1_Circ
And the other will say:
935 - 941 MHz 75W 1 Circ
Change the "935" to "925" in the second string. Save the file and you're good to go.

One person reported that RSS and his station would come up with a "Hardware Mismatch" error when he changed both strings. He found that the first location, around hex address 0D1B18, should NOT be changed, but the second one, around hex address 10B489, SHOULD be changed. These addresses may be different if your version of RSS is different than his. With just the second location altered, his station programmed and operated fine down in the 925-928 MHz range.

It is not known if the hardware will also operate properly in this extended range. Some stations seem to work fine; others may give you troubles. I don't have a 900 MHz station to try this on but I have it on good authority that it does work. You should go through the transmitter alignment and check the station's performance around 926 MHz.

Contact Information:

The author can be contacted at: his-callsign [ at ] comcast [ dot ] net.

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This page originally posted on 07-Dec-2012

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