Post date: Feb 2, 2019 4:08:48 AM
Charles NK8O shares with us a kit that is available via eBay:
From the seller:
Nothing new about this technology, it consists of two 600 ohm line transformers for audio input and output from your pc to your transceiver, and an opto-coupled push to talk circuit that works off of an RS-232 port on your computer.
Transformer coupled audio eliminates ground loops and AC hum on your signal
Opto Coupled push to talk circuit also eliminates ground loops and false triggering of your PTT lines.
Very small size, only 2 1/16” x 1 3/8” x .625” high, can be incorporated inside of many radios, with only your RS-232 cable coming outside of the radio.
Weighs less than 3 ounces
High quality FR-4, solder masked, silk screened Printed Circuit Board
Compatible with most modern ham radio transceivers.
Shipping is a tad expensive to Australia, $35.05
Same board with some more detail is here:
#audio #interface #digital #isolation #opto #nk8o #ebay