I linked coax earths to ground to ensure good RF ground so separate DC ground wire is likely redundant.īoard is wrapped in thick insulating tape after cutting down connection pins to avoid piercing the tape. Pin F is about 300mV in circuit allowing for an x10 probeĬonnect power leads (blue is ground, red/blue is +24V) and coax tails to G3TPJ board. G3TPJ board output (unloaded) is about 500mV allowing for x10 probe Pin F (1.7500 MHz in from oscillator module) is at the middle of the left edge of the PCB in this image. It is +24V when the power switch is in the 'Battery Check' position. Pin 16 is between the black plastic bar and pin 15. G3TPJ boards need to be converted to single sided component mounting as per G8JNJ website to go in the cutout so the gap between module 5 and the rear turret under the cable loom is my preference. Preferred module locations are under cable loom at mid-left or in PCB cutout at middle right. Pin F and Pin X are lower left and Pin 16 is upper right (below '15')

General view of main board before modification. Gently reconnect the two halves and apply power via a battery extension cable and verify normal operation. A motorised screwdriver is recommended ! After all the screws are out and stored safely, gently pry open the case with a flat blade screwdriver and put the gaskets in safe storage - ideally pressed flat under a book.

Carefully open the radio by removing the allen screws around the front and rear panels after noting the band switch position.

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