準備編(1)の各記事から回路のあたりを付けてみると
大体どれも構成要素は近い。
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Cited from: AMERITRON TRP-150 TRANSCEIVER INPUT PROTECTOR
INSTRUCTION MANUAL
Cited from: Receiver Protectors DEO RG-2000 vs. DXE RG-5000(W8WTS)