I've been sharing my findings with M1PAF and we have now both put a RC
Low Pass Filter across the headphone transducer of our Heil headsets but
only in the right headphone so that the left one can still hear the
artifacts for comparison.
I have chosen a LPF with values of R=260 Ohms C=0.2uF
The 12 KHz artifact appears to be the audio output DAC clock, with the
demodulated audio forming upper and lower sidebands with it. It's down
considerably, but still is apparently causing issues with those who have
good high frequency hearing response.
The K3's audio seems to have way too
]
[mailto:[EMAIL PROTECTED] On Behalf Of Jack Smith
Sent: Tuesday, September 09, 2008 6:09 AM
To: Dave G4AON
Cc: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Re: Heil Proset K3 Audio fixed, sort of.
The 12 KHz artifact appears to be the audio output DAC clock,
with the
demodulated
AM
To: Dave G4AON
Cc: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Re: Heil Proset K3 Audio fixed, sort of.
The 12 KHz artifact appears to be the audio output DAC clock,
with the
demodulated audio forming upper and lower sidebands with it.
It's down
considerably, but still is apparently
PROTECTED] On Behalf Of Jack Smith
Sent: Tuesday, September 09, 2008 6:09 AM
To: Dave G4AON
Cc: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Re: Heil Proset K3 Audio fixed, sort of.
The 12 KHz artifact appears to be the audio output DAC clock, with
the demodulated audio forming upper
PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Jack Smith
Sent: Tuesday, September 09, 2008 6:09 AM
To: Dave G4AON
Cc: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Re: Heil Proset K3 Audio fixed, sort of.
The 12 KHz artifact appears to be the audio output DAC clock
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