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13406 SE 32nd St, BELLEVUE WA, 98005 WWW.CONSUMER.STEPPIR.COM TEL: (425)-453-1910
PTT LOCKOUT TUNING RELAY (INCLUDED)
Figure 9.01
To prevent application of unintended, excessive RF power while the SteppIR antenna is tuning,
the SDA 100 and OptimizIR controller provides an isolated pair of contacts from a 3.5 mm ste-
reo jack to interrupt the PTT relay signal to a linear amplifier. The cable is provided, but any
standard 3.5 mm stereo plug to two RCA plug cable sold for audio applications works well in
most cases. Some more modern amplifier relay control schemes are different and may not ac-
commodate an RCA plug. Older amplifiers may use high voltage in their PTT circuit which may
be a problem for some transceivers. Please read your amplifier and transceiver manuals care-
fully. The 3.5 mm plug tip and ring connect to isolated relay contacts inside the controller that
interrupt the PTT circuit. The sleeve connection serves as a ground/shield. Figure 9.01
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