I use an AF1 for better volume and tone control of a VHF/UHF transceiver's audio but I first removed the ring contact from each phone jack (their side covers pop off easily) then when I installed the jacks to the PCB I also soldered a short wire jumper from each tip pad to its mating ring pad on the bottom of the PCB. This results in no modification to the PCB yet I can plug in a monaural phone plug from the radio and a monaural speaker and it all works fine. Gary N6LRV
-----Original Message----- From: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Paul Clay Sent: Saturday, December 28, 2013 12:32 PM To: elecraft@mailman.qth.net; d...@w3fpr.com Subject: Re: [Elecraft] AF1 Audio Filter Question Hi, Don. I thought to swap the headphones around to see if it might be my hearing in one ear; the reduced output swapped to the other ear. Will check using other sound sources to see if it might be the phones themselves. What's confusing me a bit is the distortion that's introduced by plugging in a monaural plug feeding speaker all the way. It's a scratchy sound that I can make go away by reducing the volume control on the radio providing the audio in to the AF1 - I'm driving the AF via my Icom R-75s external speaker port, the receiver's headphone jack or rec line out - but then the AF1s audio output is too low to be enjoyable. Suppose I could just do a mod to replace the AF1's stereo out jack with a monaural one, and then using an adapter plug between the output and my stereo phones, but would like to leave the AF1 unmodified if possible. R, Paul N6LQ ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
