If you have questions or need help, email Please put “BT-75” in the subject line for fastest response. Unified Microsystems reserves the right to change specifications of it products at any time without notice. I've tried to build one based around a 4N35 optoisolator without much joy. Hi folks, I've already built a 12V DC relay keying interface (buffer) for a Yaesu FL-2100B amplifier and it works a treat.HF 10W to 200W Class E/F Power Antenna Preamplifier 100 kHz to. HF 60W Power Amplifier IRF840 1296 MHz Low Noise Amplifier. 144 MHz 125W Power Amplifier 950 MHz to 2150 MHz LNA.
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