February 13, 1998

MICOR LOW BAND CONVERSION TO 6 METERS

The following mod is for a Motorola 42-50 split Micor low band radio. The mod takes under an hour to complete and consists of changing the values of the capacitors on the five front-end coils and five in the crystal injection stage ( not the IF stage ) . When completed, the receive sensitivity will be 0.20 uv with no effort (centered on 52.525).

Front-end mod: (must remove shield cans from coils to get to caps)

Change capacitor        C113 to 18pf
                        C116 to  18pf
                        C118 to 18 pf
                        C120 to 18 pf
                        C122 to 3.3 pf

Injection mod:

Change capacitor        C108 to 33 pf
                        C109 to 68 pf
                        C110 to 68 pf
                        C125 to 33 pf
                        C127 to 43 pf

All caps are small ceramic types or dipped mylars.

Most of the mobile versions do not require mod to the exciter stage or PA. This will depend on your particular radio.

Source: Gleaned fron the Internet; land-mobile@stat.com, via Jeff Parker WA1WXL (Steve (WB7QGJ) any comments or suggestions welcome. Honorable mention to Carl (WA3VPD) for his help.)

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