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efhw_tuner_assy_090110.pdf

We will assemble the smallest components first.

Not all components are on the same side of the board.

Please note the graphic below, as to which is front and back of the PCB.

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Install D1, the clear lens LED on the

“FRONT”

side of the board. The polarity must be correct.

The short lead is “negative” and goes towards the top of the board. There is also a very small

flat indicating the negative side of the led, and an outline indicating the flat on the board. Seat

the LED flush with the surface of the board.

Содержание EFHW

Страница 1: ...6 toroid core yellow 1 FT37 43 toroid core black 1 48 of 26AWG magnet wire for the toroids 1 Medium size control knob 1 BNC PCB connector 2 4mm x 30mm long SS Phillips screw 4 4mm nut 2 4mm lock wash...

Страница 2: ...w as to which is front and back of the PCB Install D1 the clear lens LED on the FRONT side of the board The polarity must be correct The short lead is negative and goes towards the top of the board Th...

Страница 3: ...e the two toroids on the BACK side of the board For L1 use the T50 6 yellow core and 24 of the supplied magnet wire You are winding a total of 23 turns with a tap at 3 turns from the beginning of wind...

Страница 4: ...trim to 1 4 long and tin the leads prior to soldering them to the backside of the board The magnet wire supplied Is Thermaleze brand and will tin easily with a soldering iron Always tin the leads bef...

Страница 5: ...on the PCB and centered on the screw hole You will notice the tap hole is indicated and is slightly larger in diameter to accept the double twisted wire Install the toroid flush with the backside of t...

Страница 6: ...oard and secure it with the two short metric Phillips screws from the top Solder and clip the three leads flush Install the slide switch on the FRONT side of the board soldering all four corners and e...

Страница 7: ...brilliance your SWR is approximately 2 1 and the LED will completely extinguish at 1 1 Tip from Dan If your led does not go out at 1 1 there may be a little too much gain on L2 the indicator transfor...

Страница 8: ...u use a counterpoise try to lay it out in a straight line when possible Additionally after the antenna is tuned up keeping the bridge in the circuit Tune position will reduce the power by a factor of...