On 4/25/2018 10:54 AM, Rich wrote:
Is there a commercial item for this purpose?
Yes, the RANE HC-6 would work. And they make several other small mixers that make it easy to switch and route audio. While the mixers may not have a stereo headphone output, you could easily make a cable adapter from the outputs to a cable-mounted stereo jack. I would study their catalog and look for the products used on ebay.
There's also a discontinued Shure product that does what you want. It's the model FP22 headphone amplifier. Runs on internal batteries or 12VDC. Very nice.
I know I will need an audio isolation transformer between each radio and the splitter/switch. Any suggestions on what a good impedance value would be for those transformers?
No, a transformer is NOT needed. All that is needed is proper bonding between all equipment in your station, including audio gear like the HC-6 or FP22. Study
http://k9yc.com/GroundingAndAudio.pdf 73, Jim K9YC ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
