From mboxrd@z Thu Jan 1 00:00:00 1970 From: Charles Boling Subject: Re: soundmodem Date: Thu, 27 Feb 2014 13:34:53 -0800 Message-ID: <530FAF7D.5080807@boling.us> References: <20140227163306.GH30054@belle.intranet.vanheusden.com> <20140227205136.GK30054@belle.intranet.vanheusden.com> Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20140227205136.GK30054@belle.intranet.vanheusden.com> Sender: linux-hams-owner@vger.kernel.org List-ID: Content-Type: text/plain; charset="us-ascii" To: linux-hams@vger.kernel.org > http://elektrotanya.com/PREVIEWS/45612216/23432455/transceiver/egyeb/dnt_formel_1.pdf_1.png So, just to double-check what you've done, here's what I see as pin assignments: 1 GND 2 (not shown) 3 PTT-Tx (Ground it to transmit) 4 MIC audio in (always on, other wire to Ground) 5 PTT-Rx (Ground it to receive) 6 GND (not used in original mic) The PTT button is working as a SPDT switch. I don't know how you're switching, and I didn't look closely at the schematic, but you may not want RX & TX grounded at the same time; if you're keeping RX on full-time and doing a SPST switch on TX, you might try disconnecting the RX to see if your TX audio comes in.