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Initial Testing:
Equipment Needed.
Midland 70-066 transceiver [with 66-88Mhz EPROM installed],
Frequency Counter. Reads up to 88Mhz
Power or VSWR/Power Meter to cover 50Mhz to 88Mhz.
12 Volt power supply. 10 Amps capacity.
Signal Generator to cover 50Mhz to 88Mhz.
Testing.
Hopefully, your Midland 70-066 has an installed EPROM. And the EPROM has not been erased, If this is
TRUE then;
Connect your transceiver to a 12 Volt power supply and the antenna to power meter and dummy load. Go
to channel 1; Press the transmit button to allow the power out to be loosely coupled to a Frequency
counter. Measure the Frequency and power out.
Callsign -
Frequency -
Power Out -
Then - Connect your transceiver to a signal generator and, adjust the signal generator to the above noted
frequency; Adjust the mute to just close; then - measure the micro-volts for mute opening, for receiver
sensitivity.
Rx Sensitivity –
If all of the above are OK then you may continue with the conversion or repair your transceiver before
conversion.
INITIAL TRANSCEIVER REMOVAL of COVERS:
Remove four screws from each side of the transceiver, then remove the top and bottom covers.
With a black felt marker pen – Write your callsign on each cover and inside the top and bottom of the
transceiver chassis.
Then – Modify the Z-273 EPROM PCB [part 1], the
transmitter PA [part 3].
Midland 70-066 low Band Conversion to 6 Meters: Part 1
Date -
synthesizer [part 1], the receiver [part 2], and the
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