CW @ 10Khz on an iphone - use EMF COIL under iphone speaker - use SDR demodulate to 700hz CW

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Chuck Vaughn

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Dec 23, 2020, 12:18:46 PM12/23/20
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aa0hw

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Dec 23, 2020, 4:13:33 PM12/23/20
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Here is a follow up video taking a similar setup for sending CW to mumble input on an iphone
using a Ferrite Bobbin Core Inductor COIL to EMF 5Khz CW audio into an iphone MIC for MUMBLE INPUT
https://youtu.be/oqlzTJvmvlU
On Wednesday, December 23, 2020 at 11:18:46 AM UTC-6 aa0hw wrote:

aa0hw

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Jul 27, 2021, 9:19:29 AM7/27/21
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Here is another version and setup of using an EMF COIL underneath an iphone's MIC...
to send CW to the iphone mumble input using the iphone mic's EMF PICKup from a ferrite bobbin core inductor...
the frequency of the VLF CW keyer sender to the coil is @8Khz...   and on the laptop's mumble receiver,
a VLF CW bandpass filter is used to only allow the 8Khz CW to get through and that removes all of the 
audio over air pickup by the IPHONE mic ,  a tv, people in the other room, fan noise  clocks, birds outside .. etc...
only the 8Khz VLF CW gets through(instead of listening to cw at 8Khz, it is regenerated to 777hz by two simple apps
ZAMGATE and a sine wave generator...)

Chuck Vaughn

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Jul 27, 2021, 11:52:27 AM7/27/21
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Here is a video demo of the iphone over 5g hooked up to the mumble iCW server, receiving a QRQ CW signal...


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Chuck Vaughn

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Jul 28, 2021, 11:17:00 AM7/28/21
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here is another iphone CW over mumble demo....  this is using 19Khz Forced EMF to get the CW into
the iphone MIC and get it sent out to the iCW mumble server...
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