FLEX-6000 Signature Series – Maestro User Guide
Copyright 2024 FlexRadio, Inc. All Rights Reserved. | Page 19
4.4.6 PTT Connection
The PTT connector accepts a 1/8-inch (3.5mm) stereo (TRS) plug or mono (TS) plug. Grounding the
PTT line through an external switch keys the transmitter.
4.4.7 Maestro “C” HDST Combo Microphone and Headphone Connection
The HDST connector accepts a 1/8-inch (3.5mm) TRRS plug which provides a stereo headphone
output and a microphone input. The connector utilizes the TRRS CTIA standard for the pinout.
The other competing standard is OMTP, used by older Smartphones such as Nokia and old Samsung
model cellphones.
Note: Apple headphones with a microphone adhere to the CTIA TRRS standard. Using
headphones that are compliant with the older OMTP standard may not provide optimal audio
fidelity.
4.4.8 Maestro “A” and “B” Mic 2 Connection
The MIC 2 connector accepts a 1/8-inch (3.5mm) stereo (TRS) plug and provides an unbalanced
microphone input with optional push-to-talk input. The connector may be used with dynamic or
electret microphone elements. A software-enabled 2.5V bias voltage may be applied to the Mic (+)
line for electret microphones. CAUTION: Failure to enable bias on some consumer electret
microphones may cause the PTT line to be asserted and key the transmitter.
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