Question
What are some reasons I get intermittent PTTs in Tone Mode with Analog Consoles and IP-223‘s?
Answer
When using a legacy console with RoIP transport, under certain conditions PTT activation at the radio end (Tone Mode IP-223) may not be consistent. There are two main reasons this can occur:
Signal level into the tone remote panel or tone controlled radio is too high or too low. Both insufficient signal level, or excessive signal level can cause the decoder to become unreliable. Increasing or decreasing the level into the decoding device may reveal the optimum set point. Ideally, the set point should be centered in the decoding signal “window”. This point may vary from one decoder device to another.
Doubling of the LLGT. If the Console Mode IP-223 does not have the PTT Notch filter on, a 2175 Hz sine wave is sent out with the console audio. At the radio end the Tone mode IP-223, a second LLGT tone is added. The constant variation in phase of these two beating signals will cause problems with intermittent decoding. Only the Tone mode IP-223 should be generating the LLGT. Be sure the Console mode IP-223 has the PTT Notch ON.
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