[digitalradio] MT63 Operating Tips
All, Had several QSO's with first-time MT63 OPs this week. Some had a difficulty getting used to the software settings so I thought I'd pass along a few tips. Peak Power: Peak power will be substantially higher than the average with this mode so it's best to use the software's tune feature to set the transmitters output. The most common mistake is setting the RF output power with the MT63 signal itself. This can cause distortion / throughput issues. A typical peak setting of 25 watts will show about 5 watts average on your rigs meter. Software: Fldigi, MultiPSK and Mixw all work well. Nino Porcino's MT63 Terminal has signal report and tune features that are useful for the beginner. It also has a couple of nifty "analog" gauges that measure confidence and SNR. It works well and is easy to setup. Use the asterisk * in the transmit buffer to allow the type-ahead feature. See http://xoomer.virgilio.it/aporcino/MT63/index.htm Reception: Use the markers in the waterfall and keep the signal centered between them. Nino's MT63 software has a two-tone transmit marker that helps the other party tune your signal. It shows the receiving station where the top and bottom edge of the MT63 signal is. This feature is especially helpful when signals are weak. Fast Chat Mode: It will take some getting used to MT631K if your typing is slow; it's best to use the type-ahead buffer to keep things rolling along. The 1K mode does 100 wpm so text files can be sent at a fair pace. The cut-and-paste works well for sending emails and other small files. The mode resists QRM / QRN very well and will usually print with a fair chunk of the signal overlapped by another MT63 signal. Use common sense when running a wide mode like MT63. Listen carefully to make sure your not causing interference. The 1K, long interleave mode gives the best bang-for-the-buck. Tony -K2MO
Re: [digitalradio] MT63 Operating Tips
I use a PEP output meter and back off power a little to avoid clipping. I think that works too for people that know their way around. 73, Jose, CO2JA --- Tony escribió: > All, > > Had several QSO's with first-time MT63 OPs this week. > Some had a difficulty getting used to the software settings > so I thought I'd pass along a few tips. > > Peak Power: > > Peak power will be substantially higher than the average with this > mode so it's best to use the software's tune feature to set the > transmitters output. The most common mistake is setting the RF output > power with the MT63 signal itself. This can cause distortion > / throughput issues. A typical peak setting of 25 watts will show > about 5 watts average on your rigs meter. > > Software: > > Fldigi, MultiPSK and Mixw all work well. Nino Porcino's MT63 Terminal > has signal report and tune features that are useful for the beginner. > It also has a couple of nifty "analog" gauges that measure confidence > and SNR. It works well and is easy to setup. Use the asterisk * in the > transmit buffer to allow the type-ahead feature. > > See http://xoomer.virgilio.it/aporcino/MT63/index.htm > > > Reception: > > Use the markers in the waterfall and keep the signal centered between > them. Nino's MT63 software has a two-tone transmit marker that helps > the other party tune your signal. It shows the receiving station where > the top and bottom edge of the MT63 signal is. This feature is > especially helpful when signals are weak. > > Fast Chat Mode: > > It will take some getting used to MT631K if your typing is slow; it's > best to use the type-ahead buffer to keep things rolling along. The 1K > mode does 100 wpm so text files can be sent at a fair pace. The > cut-and-paste works well for sending emails and other small files. > > The mode resists QRM / QRN very well and will usually print with a > fair chunk of the signal overlapped by another MT63 signal. Use common > sense when running a wide mode like MT63. Listen carefully to make > sure your not causing interference. The 1K, long interleave mode gives > the best bang-for-the-buck. > > Tony -K2MO > > > > > VI Conferencia Internacional de Energía Renovable, Ahorro de Energía y Educación Energética 9 - 12 de Junio 2009, Palacio de las Convenciones ...Por una cultura energética sustentable www.ciercuba.com
[digitalradio] Re: MT63 Operating Tips
First wide data mode i ever used , long time ago ..had a qso on 7 meg with cw and rtty all on in the same slot ..it printed fine .. amazing IZ8BLY prog .. dont know how good it is against the new progs . but still works .. ran some tests on 500 , and found it dident do so well down there with low signal levels .. mfsk16 > olivia > then mt63 Use the tune tone and set under the alc point ..or the drive will try to level the signal G .. --- In digitalradio@yahoogroups.com, "José A. Amador" wrote: > > I use a PEP output meter and back off power a little to avoid clipping. > I think that works too for people that know their way around. > > 73, > > Jose, CO2JA > > --- > > Tony escribió: > > All, > > > > Had several QSO's with first-time MT63 OPs this week. > > Some had a difficulty getting used to the software settings > > so I thought I'd pass along a few tips. > > > > Peak Power: > > > > Peak power will be substantially higher than the average with this > > mode so it's best to use the software's tune feature to set the > > transmitters output. The most common mistake is setting the RF output > > power with the MT63 signal itself. This can cause distortion > > / throughput issues. A typical peak setting of 25 watts will show > > about 5 watts average on your rigs meter. > > > > Software: > > > > Fldigi, MultiPSK and Mixw all work well. Nino Porcino's MT63 Terminal > > has signal report and tune features that are useful for the beginner. > > It also has a couple of nifty "analog" gauges that measure confidence > > and SNR. It works well and is easy to setup. Use the asterisk * in the > > transmit buffer to allow the type-ahead feature. > > > > See http://xoomer.virgilio.it/aporcino/MT63/index.htm > > > > > > Reception: > > > > Use the markers in the waterfall and keep the signal centered between > > them. Nino's MT63 software has a two-tone transmit marker that helps > > the other party tune your signal. It shows the receiving station where > > the top and bottom edge of the MT63 signal is. This feature is > > especially helpful when signals are weak. > > > > Fast Chat Mode: > > > > It will take some getting used to MT631K if your typing is slow; it's > > best to use the type-ahead buffer to keep things rolling along. The 1K > > mode does 100 wpm so text files can be sent at a fair pace. The > > cut-and-paste works well for sending emails and other small files. > > > > The mode resists QRM / QRN very well and will usually print with a > > fair chunk of the signal overlapped by another MT63 signal. Use common > > sense when running a wide mode like MT63. Listen carefully to make > > sure your not causing interference. The 1K, long interleave mode gives > > the best bang-for-the-buck. > > > > Tony -K2MO > > > > > > > > > > > > > > VI Conferencia Internacional de Energía Renovable, Ahorro de Energía y > Educación Energética > 9 - 12 de Junio 2009, Palacio de las Convenciones > ...Por una cultura energética sustentable > www.ciercuba.com >
RE: [digitalradio] MT63 Operating Tips
Hi, Tony! I use MT-63 on the Military Affilaite Radio System (MARS). Any of these widebandwidth modes will add up to more peak power than the average reading. I can run a *fair* amount of ALC, but I set the input by looking at the peaks on a 'scope hooked up to a directional coupler. Surplus or e-Bay scopes are cheap enough now that this may be a no-brainer for digital operators any more. Some modes are more sensitive to phase distortion than MT-63 too, and others, less. Either way,these modes require keeping the signal free of intermod, compression and flat-topping. One of the old AFSK RTTY tricks, and still a good idea, is to use high audio tones to suppress audio harmonics. Don't forget to set the actual sound card sampling frequency into whatever software used. Have fun! Cortland Richmond KA5S - Original Message - From: Tony To: digitalradio@yahoogroups.com Sent: 3/23/2009 4:31:02 PM Subject: [digitalradio] MT63 Operating Tips All, Had several QSO's with first-time MT63 OPs this week. Some had a difficulty getting used to the software settings so I thought I'd pass along a few tips. Peak Power: Peak power will be substantially higher than the average with this mode so it's best to use the software's tune feature to set the transmitters output. The most common mistake is setting the RF output power with the MT63 signal itself. This can cause distortion / throughput issues. A typical peak setting of 25 watts will show about 5 watts average on your rigs meter. Software: Fldigi, MultiPSK and Mixw all work well. Nino Porcino's MT63 Terminal has signal report and tune features that are useful for the beginner. It also has a couple of nifty "analog" gauges that measure confidence and SNR. It works well and is easy to setup. Use the asterisk * in the transmit buffer to allow the type-ahead feature. See http://xoomer.virgilio.it/aporcino/MT63/index.htm ...
[digitalradio] Re: 1000 Hz Olivia under USA new rules ?
--- In digitalradio@yahoogroups.com, Rick W wrote: > > ... There is no conflict with using wide modes (FCC defined as up > to the bandwidth of a communications quality phone transmission) > as long as the baud rate of an individual tone does not exceed > 300 baud. Hey Rick. Thanks for the reply! I think the confusion I have with "quality phone transmission" comment is the part that says "...of the same modulation type." And you say the "individual tone", but I read "symbol rate" in the regs. Can an individual tone have a baud rate? I thought the rate was how fast the tones were being sent, like a computer modem. Or, are both quotes meaning the same thing? >From what I understand, let's say, in the 20 and 40M sub-bands, the maximum >width for a signal is 1000 wide, not as wide as phone TX. That's found under >"§ 97.305 Authorized emission types." It says 20 m 14.0014.15 MHz, RTTY, data, and refers to (3) of § 97.307(f), which says: "The symbol rate must not exceed 300 bauds, or for frequency-shift keying, the frequency shift between mark and space must not exceed 1 kHz." Reason I ask, and I'm sorry if I sound dense, is it legal to transmit on the digital modes sub-bands modes that are greater than 1000 wide, like Olivia 2000? Some modes can easily be 3000 wide, but still narrower than phone communications. I've not really been able to get an answer that confirms the question: "Assuming it's in a band or sub-band that digital modes are authorized, can we operate digital modes that are wider than 1k?" Thanks for the help and input! f, k2ncc
