On my recently acquired K3s (MCU 05.62, FPF 01.26, DSP1 02.88, DSP2 N?A, DVR N/A), Serial number 11501, I have notice a USB audio anomaly that I do not understand nor can I find described in the manual.
If you monitor the USB audio output port on the attached computer you will hear, or see on the audio display of a scope application, fldigi waterfall or monitor speaker any audio that is being used to modulate the transmitter. The transmitter can even be in the TEST mode where no actual output occurs. This “looped back” audio is unaffected by the MON function and does not vary in amplitude with MON set anywhere from 0 to maximum value. It does not matter if the source of the audio is the FP mic, RP mic or Line In audio source. The audio is looped back to the USB output port at a constant amplitude. This occurs when the LIN OUT configuration option is set to NOR and at any amplitude. Only when the LIN OUT option is set to PHONES is the loopback path broken and the MON function performs as expected with the looped back level changing from OFF (MON = 0) to a varying level as the MON level is increased from 1 to 60. When using either Speakers, Headphones or both all actions are normal and as described in the manual. It is only when you monitor the USB output toward the attached computer (Mac or Windows) that you become aware of this loopback path. I believe it is a BUG but if it is a feature I would appreciate knowing where it would be beneficial. Very73 - Mike - K9JRI ______________________________________________________________ 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 Message delivered to arch...@mail-archive.com
