Sound Card<–>Radio Audio Isolation
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Colin

If you dont want to wait for the shipment from the UK, try this Arduino USB adapter from Jaycar : https://www.jaycar.com.au/arduino-compat...e/p/XC4464
"A mini-USB to 6-pin serial port module used to communicate with Arduino boards and modules. It uses the original FT232 chip with power/sending/receiving indicator and also a selectable 3.3V and 5V power option to suit different boards."  A link to the Windows driver is on the packaging (well it was on the one I bought a while back).
Win7 is ok with it here on several different computers.

For Icom CIV:  Fit a 100 ohm resistor between TXD and RXD pins, wire from RXD to the centre connector pin of a 3.5mm plug, outer of the plug back to the adapter's ground pin, preferably in a single core SHIELDED audio cable (not Fig8).    Use shielded wire to prevent CI-V comms issues with RF presence. I also run the cable a few turns through iron-powder toroids or use ferrite clip-ons to reduce RF noises back into the receiver with CI-V "chatter".

For Yaesu CAT, use twin shield audio cable back to the transceiver connector from the TXD and RXD pins... 

I am using a cheapex USB-sound adapter from eBay also and no sign of the issue you describe. It sounds like you have a bad USB lead if it drops back or bad port connectors if it drops back to the internal sound card intermittently.

eg..  "USB 2.0 to 3D AUDIO SOUND CARD EXTERNAL ADAPTER VIRTUAL 5.1 CH MIC Headphone"
eg https://www.ebay.com.au/itm/USB-2-0-to-3...0951090739

Have fun on FT8  Rolleyes
Doug VK4ADC @ QG62LG51
http://www.vk4adc.com

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Messages In This Thread
Sound Card<–>Radio Audio Isolation - by VK2CSW - 29-04-2018, 12:53 PM
RE: Sound Card<–>Radio Audio Isolation - by VK4ADC - 01-05-2018, 09:31 PM
RE: Sound Card<–>Radio Audio Isolation - by VK5ZD - 04-05-2018, 09:33 AM

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