Re: Flat Audio - Motorola
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The flat IOs are for data use....to use the tx flat input for voice, it needs to be limited and filtered externally to prevent overshoot of deviation and bandwidth on squelch noise / noisy signals. I?use the circuit in the SCT110/410 Spectrum transmitters....change the 0.0047 cap on the input to a 4.7uf for no preemphasis..simple ckt and works excellent
Chris WB5ITT?
Sorry,? I found "External Accessories" in the menu. Within the configuration window, I found "Rx Audio Output" was set to "De-emphasized". I changed it to "Flat" and that provided flat audio from the RKR1225 to the controller. I'm still a little foggy on what the EIA/Flat setting does. According to the help menu, it says EIA processes the TX and RX audio and restricts it to 300Hz -3KHz. and conversely, when "FLAT" is selected, there is no processing and limiting can be bypassed. Looking a bit closer. Looks like that may only be valid on pin 5 of the accessory connector and not pin 2. I'm using pin 2, and the transmit audio is being pre-emph'd!? Argh!
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Jim
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Chris Boone WB5ITT