Chuck aa0hw's Blog – September 2019 Archive (4)

Keying QRQ CW afcw mode on a K3S - using a high pitched PTT activation tone & delayed CW tone

Using a Raspberry PI2b and the AD5DZ CW Keying software suite -

https://youtu.be/l8wKVnA4oGc

The Pi is using the K3S internal USB SOUND CARD as its own sound card too...providing a direct LINE INPUT and LINE OUTPUT from the pi to the RIG and from the RIG to the PI

The PI sends audio to the…

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Added by Chuck aa0hw on September 30, 2019 at 1:44pm — No Comments

copying QRQ CW - testing the "Riemann" Raised Cosine Window - to form the CW NOTE rise/fall edges

every Raised Cosine Window that can be used to form the CW ELEMENT Rise/Fall time edges...sounds just a little bit different at QRQ CW speeds...this test was run at 55 wpm using the Riemann Window, and 3.3 milliseconds was also trimmed off of each element to make it just a tiny bit lighter, thinner sounding, between letters...

The AD5DZ…

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Added by Chuck aa0hw on September 23, 2019 at 11:00am — 1 Comment

testing various Raised Cosine Windows for copying QRQ CW using the AD5DZ Code Practice Oscillator

brief demo of selecting various raised cosine windows for copying qrq cw using the AD5DZ CPO, being keyed by the AD5DZ CW Keyboard....NOTE: ...might not hear much difference unless using a good set of headphones...the changes are subtle between all the raised cosine windows options....…

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Added by Chuck aa0hw on September 18, 2019 at 2:24pm — No Comments

A CW audio bandpass filter for QRQ CW - using a Gstreamer PIPELINE script which includes the filter

Experimental test to see how well a Gstreamer AUDIO OVER IP pipeline can (also)filter CW AUDIO headed for the LINE INPUT of a RIG for CW TRANSMIT using AFCW MODE on HF SSB(remote rig over Ethernet LAN setup using a Raspberry PI2b::RIG interface)

Here is the Gstreamer script that includes the additional script for the CW AUDIO BANDPASS…

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Added by Chuck aa0hw on September 7, 2019 at 4:00pm — No Comments

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