Yes, as a matter of fact I have set up a number of these little "entry level" rigs with PTT by constructing a little relay box utilizing a 4PDT relay with a low voltage (6-24VDC) coil. You can then key the relay with your mike switch. Its OK to utilize some rectified fil voltage for the relay pwr. Then utilize one set of relay contacts to key the xmtr (most are cathode keyed) via the key jack. Utililize a second set of contacts to key your antenna relay, a third to key the VFO, if you are using one, and the last set to mute your receiver (either make or break according to what your rcvr requires). This little scheme works great and can be moved from rig to rig to quickly add PTT type operation.
Good Luck! 73, Jack, W9GT -------------- Original message -------------- From: Rick Brashear <[EMAIL PROTECTED]> > Does someone have a good method of modifying a DX-40 for PTT? > > Thanks, > Rick/K5IZ > > > ______________________________________________________________ > AMRadio mailing list > Home: http://mailman.qth.net/mailman/listinfo/amradio > Help: http://mailman.qth.net/mmfaq.html > Post: mailto:[email protected] > AMfone Website: http://www.amfone.net > AM List Admin: Brian Sherrod/w5ami, Paul Courson/wa3vjb From [EMAIL PROTECTED] Thu Apr 20 18:08:36 2006 Return-Path: <[EMAIL PROTECTED]> X-Original-To: [email protected] Delivered-To: [email protected] Received: from smtp-0.mpinet.com (smtp-0.mpinet.com [216.53.130.180]) by mailman.qth.net (Postfix) with ESMTP id 3C497859C18 for <[email protected]>; Thu, 20 Apr 2006 18:08:36 -0400 (EDT) Received: from 2oldracing.com (host-216-97-193-52.hosting.mpinet.com [216.97.193.52]) by smtp-0.mpinet.com (8.13.1/8.13.1) with ESMTP id k3KM6uEs026097 for <[email protected]>; Thu, 20 Apr 2006 18:06:56 -0400 Received: from [127.0.0.1] (216-53-175-019.dsl.mpinet.com [216.53.175.19] (may be forged)) (authenticated) by 2oldracing.com (8.11.6/8.11.6) with ESMTP id k3KM6vk08489 for <[email protected]>; Thu, 20 Apr 2006 18:06:57 -0400 Message-ID: <[EMAIL PROTECTED]> Date: Thu, 20 Apr 2006 18:07:30 -0400 From: gwt <[EMAIL PROTECTED]> User-Agent: Mozilla Thunderbird 1.0.2 (Windows/20050317) X-Accept-Language: en-us, en MIME-Version: 1.0 To: AM Radio List <[email protected]> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Subject: [AMRadio] Correct tuning procedure X-BeenThere: [email protected] X-Mailman-Version: 2.1.4 Precedence: list Reply-To: Discussion of AM Radio <[email protected]> List-Id: Discussion of AM Radio <amradio.mailman.qth.net> List-Unsubscribe: <http://mailman.qth.net/mailman/listinfo/amradio>, <mailto:[EMAIL PROTECTED]> List-Archive: <http://mailman.qth.net/mailman/private/amradio> List-Post: <mailto:[email protected]> List-Help: <mailto:[EMAIL PROTECTED]> List-Subscribe: <http://mailman.qth.net/mailman/listinfo/amradio>, <mailto:[EMAIL PROTECTED]> X-List-Received-Date: Thu, 20 Apr 2006 22:08:36 -0000 Hi, I'm wondering if some "guru" out in AM land can set me straight on how to properly tune a long wire using an "L" network or a "T" network tuner configuration. I have two long wires, each 285 feet long. They feed directly into my shack, where the tuner is located. I have a tuner that I built using a BC610 external tuner roller inductor and two BC610 variable capacitors, allowing me to use either method to tune my long wires. Question #1: Which is the best method to tune with? An "L" network or a "T" network? Question #2: To reduce the losses coming from the tuner, which is best to use? The least amount of inductance you can use to get a match, or the highest inductance to get a match? Question #3: Which method will most likely give the widest bandwidth without re adjustment? Thanks, George KE4HJ
