Michael, Standard CTCSS tones used on FM can range up to 254 Hz. So, on Tx we have to block microphone energy below about 300 Hz. Likewise, on Rx, we have to suppress things below about 300 Hz so you won't hear continuous CTCSS tones in the audio.
The DSP filters have some slope, so the audio filter corner frequencies must be a bit higher than this. I'll look into the firmware and see if there is a way to reduce the low frequency corner frequency without degrading CTCSS. Thank you for bringing this to our attention. 73, Lyle KK7P > But i observed a lack of quality on FM-the sound is very thin compared to AM > and SSB. > It seems that the DSP cuts out the range from 400 to 2700Hz (uuh!). ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
