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A note about audio levels on FLEX-6000 series transceivers.
We've been responding to an unusual number of helpdesk requests about distorted TX audio in the FLEX-6000 series transceivers. In almost every case, the operator was convinced the distortion was the byproduct of a hardware problem and requested an RMA. Only an extremely low percentage of RMA cases for distorted audio resolved to a problem requiring a repair.
I think most operators are aware that a correct audio level is set using an average at -10dBm and allowing peaks to 0dBm. However, the audio meter in SSDR measures levels prior the application of any audio processing. This means, for example, if you add +5dB of TX EQ, that change in level is not visible on the meter. This can risk over-driving the audio chain by 5dB on peaks, and introduce the possibility of distortion in the final audio product. This is true of any audio processing (DEXP, PROC and EQ) provided by the transceiver.
Please consider this nuance when you set your audio level and manually reduce the input gain to accommodate gain in the audio processor stage. This typically means reducing the input level by the same value of any applied TX EQ,
We do recognize the need to provide visible level metering to both pre and post-processed audio.
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