Lots of equipment can encode the 2+2 Quick Call format but since today's decoders are software based (counting squared off audio waveforms) instead of hardware based (mechanical reeds) nothing I have seen recently will accurately decode the format.
Milt N3LTQ ----- Original Message ----- From: [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: Saturday, October 11, 2008 6:37 PM Subject: Re: [Repeater-Builder] Zetron SCU controller Hi Ian, >Does anyone have any info on the unit in question that generated those tones? I'd love to find one - just for memorabilia. That tone format has been around for a long time in mobile radio (Motorola Quik-Call I) and is still being used in aviation (ICAO SELCAL) to page aircraft on the company channel. A chime informs the flight crew that a message follows (in case the volume has been turned down -- it happens when you have three radios going... :-). Aviation uses SELCAL on VHF-AM and HF channels, but on HF the tones are sent with amplitude modulation to ensure proper decoding while the conversations take place on SSB. Our air/ground interconnect and 7330 repeater controller support SELCAL because commercial customers still use it. 73, Bob Bob Schmid, WA9FBO, Member S-COM, LLC PO Box 1546 LaPorte CO 80535-1546 970-416-6505 voice 970-419-3222 fax www.scomcontrollers.com ------------------------------------------------------------------------------ New MapQuest Local shows what's happening at your destination. Dining, Movies, Events, News & more. Try it out!
