AWA RT85 & Midland 70-066 low Band Conversion to 6 Meters:   

by  VK2DOT Rod          Last Updated –   01-Sep-09

Information on the AWA RT85 and the  Midland 70-066 are contained in the document [there is enough data in the document for conversion of the AWA RT85 to 6 Meters, but not the Midland RT85C at this point in time]. If you need future updates that occur from time to time for the 6 Meter conversion documentation, etc – Please email at vk2dot@tpg.com.au.

Information:

The AWA RT-85 & Midland 70-066 transceivers are characterized as a mobile base unit, approx 25cm Length, 20cm Width, 6cm Depth, with heat sink at one end, The AWA RT85 has two IDC connectors at the other end, one 26 pin for remote head connection a 20 pin connector, a BNC antenna socket and 13.8V DC power lead. The remote Head, includes twin 7 segment displays for channel indication and several buttons for channels selection, scan facilities, plus Volume and Mute controls, TX & RX indication LEDS. The Midland 70-066 has a local head, the Midland 70-076 has a remote head.

Channel Capacity                    - 80 Channels  00-79

Options that can be fitted       - Selcall, CTCSS, Data Control Head.

Options already in radio         - Scanning Variable rate, 80 Channels in one bank, Status.

 

AWA RT85 Power                 - 25 Watts                   Midland 70-066 Power           - 40 Watts

AWA RT85 Head                   - Remote                     Midland 70-066 Head                        - Local

                                                                                    Midland 70-076 Head                        - Remote

 

 

Downloads:

 

RT85 & 70-066 Conversion in PDF format Part 1.           Introduction    Ver 2.3

 

RT85 & 70-066 Conversion in PDF format Part 2.           Synthesizer      Ver 1.9

 

RT85 & 70-066 Conversion in PDF format Part 3.           Receiver          Ver 1.8

 

RT85 & 70-066 Conversion in PDF format Part 4.           Transmitter PA

 

RT85 & 70-066 Conversion in PDF format Part 5.           Diagrams

 

RT85 & 70-066 Conversion in PDF format Part 6.           Z-273 Adapter

 

Midland 70-066 Conversion in PDF format Part 7A.       Service Manual Part 1

 

Midland 70-066 Conversion in PDF format Part 7B.        Service Manual Part 2

 

Midland 70-066 Conversion in PDF format Part 7C.       Service Manual Part 3

 

Midland 70-066 Conversion in PDF format Part 7D.       Service Manual Part 4

 

 

62 Channel EPROM:

 

Firmware for RT85 6 meters 2.5Khz step 2716 EPROM.                        - File m6m-25k.bin.

 

            Frequency Chart for EPROM above.                                                        - File m6m-25.fre for above file.

 

Firmware for RT85 6 meters 5Khz step 2716 EPROM.                           - File m6m-5k.bin.

 

            Frequency Chart for EPROM above.                                                        - File m6m-5k.fre for above file.

 

Firmware for RT85C 6 Meters  2764 EPROM.                                        - Not Finished.

 

            Frequency Chart for EPROM’s above.                                                      - Not finished.

 

 

10 Channel EPROM:

 

Firmware for RT85   6 Meters  2716 EPROM 10 Channel for Packet. - File 6M-10cP.bin.  Has to be added

 

Frequency Chart for Packet EPROM above .                                            - File 6M-10cP.fre for above file.

 

Firmware for RT85   6 Meters  2716 EPROM 10 Channel.                      - File 6M-10c.bin.    Has to be added

 

Frequency Chart for Packet EPROM above .                                            - File 6M-10c.fre for above file.

 

 

Foundation Call EPROM:

 

Firmware for RT85   6 Meters  2716 EPROM 10 Channel for F Calls. - Has to be added

 

Frequency Chart for Packet EPROM above .                                            - File 6M-10cF.fre for above file.

 

Frequency Chart for above 6M 2716 EPROM  62 Channel for F Calls.             - Has to be added

 

Frequency Chart for Packet EPROM above .                                            - File 6M-F.fre for above file.

 

 

Other:

 

RT85 6meter Firmware Generator Software.   -  23-Apr-09  Software not finished, but will work to generate your own firmware for an AWA RT85 or Midland 70-066 transceivers.

 

6 Meter Antenna.   -                                                  Antenna is a 5/8 Base Whip by Bob VK2ZAR.

 

            If users need a special set of frequencies setup for an unique area, etc – Please contact me at vk2dot@tpg.com.au . So we can generate an EPROM image for you and place on this web site.

 

 

Index:

 

Part 1:  Acknowledgment:

Modifications:

Parts Needed:

Test Equipment needed.

CCARC Project.

Information about AWA RT-85.

Information about Midland 70-066

6 Meter AWA RT85 & Midland 70-066 FM Frequencies – 62 channel EPROM.

Using the Club’s De-soldering Station.

Midland Models:

EPROM Software:

The RT-85 Transceiver – Theory of operation.

 

 

Part 2:  The Synthesizer Board including EPROM board.

Z-273 EPROM Board:

The VK2DOT Z-273 Adaptor.

The Synthesizer Board.

Synthesizer Alignment.

 

 

Part 3:  Receiver RF Front end.

The Receiver Board:

Receiver Alignment.

AWA RT85 Receiver Board Top Assembly View

AWA RT85 Receiver Board Bottom Capacitor View:

 

 

Part 4:   Transmitter PA Circuit.

The Transmitter PA board.

Transmitter Alignment.

 

 

Part 5:  The RT-85 Transceiver – Block Digram

Receiver Circuit.

Receiver RF Front End Circuit:

Transmitter Circuit.

PA Transmitter Circuit:

 

 

Part 6:            The Z-273 EPROM PCB Adapter

 

Part 7A:         The Midland 70-066 Manual 1

 

Part 7B:          The Midland 70-066 Manual 2

 

Part 7C:         The Midland 70-066 Manual 3

 

Part 7D:         The Midland 70-066 Manual 4

 

Part 8A:         The AWA 85 Manual 1

 

 

 

 

 

 

 

AWA RT85 Above.

 

 

 

Midland 70-066 Above.