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Acknowledgment:
This project was started in June 2008 by John Cain VK7CEJ suggesting that one tries to convert an AWA
RT85 low band commercial radio transceiver to 6 meters. John also forwarded a number of AWA85's to
me. Acknowledgement must be given to:- Steve VK2KFJ, Peter VK2ZZA, Roger Baker VK3BKR, Mark
Detering VK3TLW, Phil Rice VK3BHR, Mark VK3BYY, Phil VK1PL who converted me to the
Midland family of transceivers, Andrew VK4OX for the information gained from their past
documentation and generous guidance. Warwick VK4NW for the PA Modifications.
Modifications Time:
The modifications contained within this document should take the average non technical amateur, the
following time's:->
EPROM board
The Synthesizer board
The Receiver board
The Transmitter PA board 1 hour
Total:
All Parts Needed:
IC Socket – Low profile 24 pin - 1 of
All Midland 70-066 Parts Needed:
Capacitors.
2.2pF
- 2 of
4.7pF
- 1 of
5.6pF
- 3 of
8.2pF
- 3 of
22
pF
- 7 of
27
pF
- 2 of
33
pF
- 1 of
39
pF
- 2 of
100
pF
- 1 of
1000
pF
- 1 of
Note: If you acquire your capacitors from "Jaycar Electronics", then please check the capacitor values
in each packet. It has been found that, incorrect values have been added to packets of
capacitors.
For the first few weeks of the conversion - you will need a box or A4 plastic bag to hold your
screws and plates of the transceivers. Plus a 24 pin low profile IC socket [if you do not have a Z-
273 board burner, 2 of 22pf capacitors, a 5.6pf capacitor, approximately 1 meter of about
0.63mm enamel coated wire & a reel of solder wick. On the first night of conversion you will
need a Philips screwdriver. Later on, you will need a 5mm drill bit to wind your coils on.
Wire.
Approximately 10cm of 0.5mm (NOTE: 0.63mm wire will do the job)
Approximately 1 meter of 0.63mm [22bs] enameled coated wire [Jaycar WW4018].
Midland 70-066 low Band Conversion to 6 Meters: - Introduction Part 1
Modifications
Alignment
1 hour
1 hour
1 hour
4 hours
[Jaycar PI-6506 ]
Jaycar
RC-5304
Note:
RC-5308
RC-5309
RC-5311
RC-5316
RC-5217
RC-5218
RC-5219
RC-5324
RC-5336
Nil
1 hour
1 hour
1 hour
3 hours
Overall 7 hours.
(If you do not have a Z-273 burner)
All capacitors are 50V Ceramic
Page 1.4
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