Joe,
Just to avoid misunderstanding: under the tone transmission I mean beginning
and end of the message transmission.
Short burst before the message also has clicks.
73 Igor
>Вторник, 8 декабря 2015, 23:15 +03:00 от Игорь Ч <[email protected]>:
>
>Hi Joe and all,
>
>Strong interference from loud JT65 signal pushed me to check audio
>transmission.
>
>With my sound card I have found two issues with the TX signal:
>
>major one: tone transmission is started and stopped at sinus phase different
>from 0 degrees (amplitude different from value 0).
>
>minor one: there is short tone burst before the message transmission.
>
>Both issues exist for whole message/interval transmission and for enable/halt
>sequence in part of the interval transmission.
>
>The major issue causes clicks and wide spectrum that occupies whole
>transmitter bandwidth (or SSB bandwidth for classic transceiver), making
>interference to receiving stations in the JT65/JT9 band.
>
>I have put audio files and pictures showing the issues there:
>https://cloud.mail.ru/public/E7XG/pwmYLStWC
>
>Files were recorded and analyzed with Audacity software via VBcable driver.
>
>There is some probability I have got bad sound card/driver, it would be great
>to re-check it on your computer.
>
>73 Igor UA3DJY
>
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