I've discovered that the RKR1225 / Specta series radio RSS setting allows you to select "post" or "pre" limiting for the TX audio path for flat inputs on the accessory port.?
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Not familiar with the spectrum radios. Where is the cap? In series with the TX audio input to the transmitter?
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Also worth noting, and I've found a ton of conflicting information on the site regarding flat TX audio with these radios, you must use pin 5 on the accessory port for TX audio if you expect to have flat audio. Pin 2 is commonly suggested to be used for speech or normal audio from a controller. However, the audio out of the transmitter is pre-emph'd regardless of the "TX Flat Audio Input" setting. I mistakenly thought that setting it to post (not "pre) meant no pre-emphassis on any TX input on the accessory port. This is not the case. If you use pin 2 it's Pre-emph'd period!.?
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I've moved over to using pin 5 with the RSS External Accessory menu item "TX Flat Audio Input" set to "pre". Not seeing any overshoot or excessive deviation at higher frequencies. I'll double-check again today.
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Thanks for your suggestion!
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Jim? ??
