Figure 1. Front view.
|TUNER/DUMMY LOAD||Input selector switch.
Tuner: input signal goes to tuner via Stockton Power meter
Dummy load: input goes to dummy load via Stockton Power meter
|METER||5W: Measure input power. Max. meter deflection is 5 W.
20W: Measure input power. Max. meter deflection is 20 W.
FORW: Measure forward power (input power)
REV: Measure reverse power (reflected power)
|FORW SET||Adjust to maximum meter deflection when the METER switch
is in the FORW position.
|Cin||Antenna tuner adjustment|
|L||Antenna tuner adjustment|
|Cout||Antenna tuner adjustment|
The different blocks are seen in fig. 2. Please compare with the photo
in fig. 3.
Figure 3. Top view.
Figure 4. Circuit diagram.
|Cin||500 pF variable capacitor|
|Lin||5 turns 0.6 mm (22 AWG) on center of L|
|L||26 turns 0.6 mm (22 AWG). Length of winding is
28 mm (about 1 inch); make 6 taps every 2 turns beginning
from one side; then make 6 more beginning from the other side.
|S1||2 x 6 position rotary switch|
|Coil form||Diameter is 26 mm (1 inch); length is 60 mm (2½ inch).
Material: Plastic container originally used for coins.
I asked for one in a local bank and got it for free.
|Cout||200 pF variable capacitor|
Figure 5. Cout is connected to tap 6 (used at lower frequencies).
Figure 6. Cout is connected to tap 2 (used at high frequencies).
Figure 7. Rear view.