[digitalradio] Re: QRV new JT8 mode
I will be on 14076.25 with JT8 most of today TOL = 400 Andy K3UK --- In digitalradio@yahoogroups.com, Andy obrien k3uka...@... wrote: I will be QRV over night using JT8 mode. I will xmit when in shack and listen only while sleeping. 7076 USB Andy K3UK 4. Alternative Modes for EME, Microwaves, and QRP at HF JT8 is proposed as a possible alternative to JT4. Modulation is 8-FSK at 2.857 baud. FEC uses convolutional codes with K=14, r=1/4, K=15, r=1/6, or K=16, r=1/8, depending on message length. Synchronization uses 8�8 Costas arrays at the beginning and end of a transmission, followed by two additional symbols to distinguish between 30-bit, 48-bit, and 78-bit messages. Total bandwidth is 23 Hz. At present, only the 78-bit messages have been implemented.
Re: [digitalradio] Re: QRV new JT8 mode
I see more action on JT8 this morning. From: obrienaj Sent: Sunday, June 20, 2010 6:44 AM To: digitalradio@yahoogroups.com Subject: [digitalradio] Re: QRV new JT8 mode I will be on 14076.25 with JT8 most of today TOL = 400 Andy K3UK --- In digitalradio@yahoogroups.com, Andy obrien k3uka...@... wrote: I will be QRV over night using JT8 mode. I will xmit when in shack and listen only while sleeping. 7076 USB Andy K3UK 4. Alternative Modes for EME, Microwaves, and QRP at HF JT8 is proposed as a possible alternative to JT4. Modulation is 8-FSK at 2.857 baud. FEC uses convolutional codes with K=14, r=1/4, K=15, r=1/6, or K=16, r=1/8, depending on message length. Synchronization uses 8�8 Costas arrays at the beginning and end of a transmission, followed by two additional symbols to distinguish between 30-bit, 48-bit, and 78-bit messages. Total bandwidth is 23 Hz. At present, only the 78-bit messages have been implemented. No virus found in this incoming message. Checked by AVG - www.avg.com Version: 9.0.829 / Virus Database: 271.1.1/2950 - Release Date: 06/19/10 13:50:00
Re: [digitalradio] Re: QRV new JT8 mode
I Contacted W1XT a few minutes ago and it chops of the the last two characters of his exchange. Has anyone see this on JT8? Warren / K5WGM --- On Sun, 6/20/10, Rudy Benner ben...@vianet.ca wrote: From: Rudy Benner ben...@vianet.ca Subject: Re: [digitalradio] Re: QRV new JT8 mode To: digitalradio@yahoogroups.com Date: Sunday, June 20, 2010, 8:16 AM I see more action on JT8 this morning. From: obrienaj Sent: Sunday, June 20, 2010 6:44 AM To: digitalradio@ yahoogroups. com Subject: [digitalradio] Re: QRV new JT8 mode I will be on 14076.25 with JT8 most of today TOL = 400 Andy K3UK --- In digitalradio@ yahoogroups. com, Andy obrien k3uka...@... wrote: I will be QRV over night using JT8 mode. I will xmit when in shack and listen only while sleeping. 7076 USB Andy K3UK 4. Alternative Modes for EME, Microwaves, and QRP at HF JT8 is proposed as a possible alternative to JT4. Modulation is 8-FSK at 2.857 baud. FEC uses convolutional codes with K=14, r=1/4, K=15, r=1/6, or K=16, r=1/8, depending on message length. Synchronization uses 8�8 Costas arrays at the beginning and end of a transmission, followed by two additional symbols to distinguish between 30-bit, 48-bit, and 78-bit messages. Total bandwidth is 23 Hz. At present, only the 78-bit messages have been implemented. No virus found in this incoming message. Checked by AVG - www.avg.com Version: 9.0.829 / Virus Database: 271.1.1/2950 - Release Date: 06/19/10 13:50:00
Re: [digitalradio] Re: QRV new JT8 mode
søn, 20 06 2010 kl. 09:40 -0700, skrev Warren Moxley: I Contacted W1XT a few minutes ago and it chops of the the last two characters of his exchange. Has anyone see this on JT8? Warren / K5WGM Most likely he wrote a message longer than the limit (14 chars) Vy 73 de OZ1PIF/5Q2M, Peter * ** Genius is one per cent inspiration, ** ** and ninety-nine per cent** ** perspiration. ** ** -- Thomas A. Edison ** * email: peter(no-spam filler)@frenning.dk http://www.frenning.dk/oz1pif.htm Ph. +45 4619 3239 Snailmail: Peter Frenning Ternevej 23 DK-4130 Viby Sj. Denmark *
