Midland 70-066 Manual page 13

Conversion to 6 meters

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Z-273 EPROM Board:

NOTE: For the CTCSS and receiver to work properly [ie audio out to speaker to work] on the Midland

70-066 transceivers – Make sure the 8 pin plug is plugged into the white 8 pin socket J903 on the Z-273

EPROM board.

There are three methods of changing the EPROM data for different frequencies,

1. Using a MRP70-1000C (MRP-70) programmer box and software. This method allows you to

program the EPROM on the Z-273 board, without de-soldering the EPROM from the Z-273 board.

The programmer box can be purchased in Australia for approx $300 or from the US for approx

$450 US; or;

2. Remove the Z-273 board from the Synthesizer Board. Then remove the 2716 EPROM using de-

soldering equipment from the EPROM board. Then solder a low profile 24 pin socket to the

EPROM board.

Reprogram EPROM with 6 meter firmware, by using the VK2DOT Midland software or any other

software.

3. Using the VK2DOT Z-273 adapter [as shown in section 5.]

Remove the Z-273 board from the Synthesizer Board.

Amend the Z-273 board as described in section 5.

Erase the EPROM on the Z-273 Board.

Place the Z-273 board on to the top of the VK2DOT Z-273 adapter;

Then insert the adapter into the EPROM zero insertion burning socket.

Burn the EPROM on the Z-273 Board using conventional EPROM burning software, of the file [eg

6meters.bin] containing the new frequencies. Which has been generated by the VK2DOT software.

Midland 70-066 low Band Conversion to 6 Meters: Part 1

Page 13