[digitalradio] How to choose Olivia tone/bandwidth parameters -- an idea
Here is an idea that Olivia developers might care to consider. People often remark that it's difficult to set up the right parameters when receiving Olivia signals. There are potentially eight possible tone settings to choose from (2, 4, 8, 16, 32, 64, 128 and 256 tones) and five possible bandwidths (125, 250, 500, 1000 and 2000 Hz) -- a total of 40 possible combinations -- making it almost impossible to choose the right combination before the signal disappears. Out of these 40 possible tone/bandwidth combinations, there are probably up to 8 that are in popular use: 4/250, 4/500, 8/250, 8/500, 8/1000, 16/500, 16/1000 and 32/1000. Even so, narrowing the choice down to these 8 still takes too long. What is needed is a simple way of indicating which combination is in use at the start of transmission. This is where we can make use of the capability to display text characters in the waterfall. If we allocate a code for each tone/bandwidth combination, and display that code as text in the waterfall immediately before transmitting the Olivia signal, it will be possible to set up the correct parameters very quickly, in time to decode the signal. A possible coding scheme could be as in the table below. The most popular combinations are indicated with asterisks. Each code is preceded by the letters OL- (for Olivia), to identify the mode. So, for an 8/500 signal, you would see the characters OL-12 in the waterfall before the Olivia signal starts. OL-CodeTones / Bandwidth OL-00 2 125 OL-01 2 250 OL-02 2 500 OL-03 2 1000 OL-04 2 2000 OL-05 4 125 OL-06 4 250 *** OL-07 4 500 *** OL-08 4 1000 OL-09 4 2000 OL-10 8 125 OL-11 8 250 *** OL-12 8 500 *** OL-13 8 1000 *** OL-14 8 2000 OL-1516 125 OL-1616 250 OL-1716 500 *** OL-1816 1000 *** OL-1916 2000 OL-2032 125 OL-2132 250 OL-2232 500 OL-2332 1000 *** OL-2432 2000 OL-2564 125 OL-2664 250 OL-2764 500 OL-2864 1000 OL-2964 2000 OL-30 128 125 OL-31 128 250 OL-32 128 500 OL-33 128 1000 OL-34 128 2000 OL-35 256 125 OL-36 256 250 OL-37 256 500 OL-38 256 1000 OL-39 256 2000 This idea could even be extended to other modes, substituting a different code in place of OL. I believe that Olivia is greatly under-utilized because of the difficulty in choosing the correct tone/bandwidth parameters when receiving a signal. Being able to select the parameters quickly by reading the code in the waterfall should go a long way to promoting more Olivia activity. Comments anyone? -- 73 Ian, G3NRW
Re: [digitalradio] How to choose Olivia tone/bandwidth parameters -- an idea
You see the bandwidth already - so why not just OL + number of tones? I don't think users will like a lookup table. Simon Brown, HB9DRV -- From: Ian Wade [EMAIL PROTECTED] Here is an idea that Olivia developers might care to consider.
Re: [digitalradio] How to choose Olivia tone/bandwidth parameters -- an idea
Interesting, but I believe it has already been done in MultiPSK with the RS ID codes sent in MFSK in the preamble. They seem to work well. I have used Video ID's and maybe your proposal is a bit more compact and readable that the usual video ID's. It should be tested out. I believe tha making Olivia more popular is a good thing. Just some more food for thought. 73, Jose, CO2JA I am crossposting this to the Olivia and MultiPSK groups from the digitalradio group. Seems an interesting point in favor of Olivia. --- Ian Wade wrote: Here is an idea that Olivia developers might care to consider. People often remark that it's difficult to set up the right parameters when receiving Olivia signals. There are potentially eight possible tone settings to choose from (2, 4, 8, 16, 32, 64, 128 and 256 tones) and five possible bandwidths (125, 250, 500, 1000 and 2000 Hz) -- a total of 40 possible combinations -- making it almost impossible to choose the right combination before the signal disappears. Out of these 40 possible tone/bandwidth combinations, there are probably up to 8 that are in popular use: 4/250, 4/500, 8/250, 8/500, 8/1000, 16/500, 16/1000 and 32/1000. Even so, narrowing the choice down to these 8 still takes too long. What is needed is a simple way of indicating which combination is in use at the start of transmission. This is where we can make use of the capability to display text characters in the waterfall. If we allocate a code for each tone/bandwidth combination, and display that code as text in the waterfall immediately before transmitting the Olivia signal, it will be possible to set up the correct parameters very quickly, in time to decode the signal. A possible coding scheme could be as in the table below. The most popular combinations are indicated with asterisks. Each code is preceded by the letters OL- (for Olivia), to identify the mode. So, for an 8/500 signal, you would see the characters OL-12 in the waterfall before the Olivia signal starts. OL-CodeTones / Bandwidth OL-00 2 125 OL-01 2 250 OL-02 2 500 OL-03 2 1000 OL-04 2 2000 OL-05 4 125 OL-06 4 250 *** OL-07 4 500 *** OL-08 4 1000 OL-09 4 2000 OL-10 8 125 OL-11 8 250 *** OL-12 8 500 *** OL-13 8 1000 *** OL-14 8 2000 OL-1516 125 OL-1616 250 OL-1716 500 *** OL-1816 1000 *** OL-1916 2000 OL-2032 125 OL-2132 250 OL-2232 500 OL-2332 1000 *** OL-2432 2000 OL-2564 125 OL-2664 250 OL-2764 500 OL-2864 1000 OL-2964 2000 OL-30 128 125 OL-31 128 250 OL-32 128 500 OL-33 128 1000 OL-34 128 2000 OL-35 256 125 OL-36 256 250 OL-37 256 500 OL-38 256 1000 OL-39 256 2000 This idea could even be extended to other modes, substituting a different code in place of OL. I believe that Olivia is greatly under-utilized because of the difficulty in choosing the correct tone/bandwidth parameters when receiving a signal. Being able to select the parameters quickly by reading the code in the waterfall should go a long way to promoting more Olivia activity. Comments anyone?
Re: [digitalradio] How to choose Olivia tone/bandwidth parameters -- an idea
Clever...simple and evident. There is a common russian phrase that applies kratka sistra talanta, conciseness is the sister of talent. 73, Jose, CO2JA --- Simon Brown wrote: You see the bandwidth already - so why not just OL + number of tones? I don't think users will like a lookup table. Simon Brown, HB9DRV -- From: Ian Wade [EMAIL PROTECTED] Here is an idea that Olivia developers might care to consider. Announce your digital presence via our Interactive Sked Page at http://www.obriensweb.com/sked Check our other Yahoo Groups http://groups.yahoo.com/group/dxlist/ http://groups.yahoo.com/group/contesting http://groups.yahoo.com/group/themixwgroup Yahoo! Groups Links -- MSc. Ing. Jose Angel Amador Fundora Profesor Auxiliar Departamento de Telecomunicaciones Facultad de Ingenieria Electrica, CUJAE Calle 114 #11901 e/ 119 y 127 Marianao 19390, Ciudad de la Habana, Cuba Tel: (53 7) 266-3445 Email: amador at electrica.cujae.edu.cu
Re: [digitalradio] How to choose Olivia tone/bandwidth parameters -- an idea
-Original Message- From: Jose A. Amador [EMAIL PROTECTED] Date: Sun, 1 Jun 2008 Time: 16:02:39 Clever...simple and evident. There is a common russian phrase that applies kratka sistra talanta, conciseness is the sister of talent. Pravil'no, moi dorogoi dryg! Vsego xoroshego! -- 73 Ian, G3NRW
