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Wind and install transformer T1. This transformer can be wound with either a pair of wires
twisted together at 8-10 turns per inch and then wound on the core, or with the pair of wires
wound in parallel. Either method will yield a suitable transformer. An example of each method
was shown earlier in this manual.
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Install the 2SC5739 transistor at Q25. Make sure the longer side of the TO-220 case is toward
the outside edge of the PCB before soldering the leads.
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Install capacitors C96, C97 and C99.
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Install electrolytic capacitor C98 matching the polarity markings on the case with those on the
PCB.
Your PCB should look like that shown in the next figure.
Test – No test will be performed at this step because we do not have a load on the final
amplifier. We will add the output low pass filter in the next step and then test the final amplifier
with a resistive dummy load attached to absorb the RF output power.
Transmit Output Low Pass Filter
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Wind and install inductors L1 and L2.
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Install capacitor pairs C47/C95, C48/C84, C51/C85, and C49/C50. Some of these capacitors
may not be used in your rig, depending on the band it is on. Unused capacitors are shown on
the schematic with a value of 0 pF.
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Install the BNC output connector to the pads marked "ANT" using discarded leads from
- Figure 43 -
36
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