Chuck aa0hw's Blog – March 2018 Archive (3)

QRQ Morse Code Audio over Mumble Voip - low bit rate(8k) experiment using the ZamGate CW RE-Keyer

this is a follow up to the first video about this topic:

https://youtu.be/BgVdf55w13M

to see how well this RE-KEYING SOFTWARE SYSTEM could RE-KEY low bit rate qrq cw audio over MUMBLE VOIP at 60 wpm

FROM 1st Video on this topic:

low bit rate…

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Added by Chuck aa0hw on March 19, 2018 at 8:44am — No Comments

how to STOP your HAM RADIO RIG from sending CW NOTE edge noise harmonic spurs during TRANSMIT

the typical modern RIG, usually shapes its CW TRANSMIT waveform as a raised cosine edged cw note with a Rise and Fall time between 5 and 10 milliseconds....For this test a 7ms rise and fall time of a perfect raised cosine cw note created by FLdigi is used to represent the "modern rigs" and tested against another software CW KEYER called the ZamGate…

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Added by Chuck aa0hw on March 2, 2018 at 12:22pm — No Comments

Remote Rig Audio over ip - using Zita-NJbridge - "16 bit" verses "24 bit" audio streaming - test and compare audio stream quality between bit rates

Brief test to see how well the ZITA-NJbridge software would do at streaming high quality, extreme QRQ CW, high speed Morse Code audio tones over the LOCAL AREA NETWORK(LAN)(audio OVER ip). 2 tests were done, one using a "16 bit" digital audio PCM ZITA-stream and another test using a "24 bit" digital audio PCM ZITA-stream. The ZITA-PCM 24 bit audio stream won the contest by a wide margin, and…

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Added by Chuck aa0hw on March 2, 2018 at 10:00am — 2 Comments