Re: [digitalradio] Re: Olivia vs. RTTY vs. PSK spectrum efficiency
- Original Message From: g4ilo jul...@g4ilo.com To: digitalradio@yahoogroups.com Sent: Tue, July 20, 2010 4:29:15 AM Subject: [digitalradio] Re: Olivia vs. RTTY vs. PSK spectrum efficiency Just because a mode is better doesn't mean that people will want to use it, though, and I guess both RTTY and PSK31 are so established now that you'll never persuade people to give them up. Julian, G4ILO While rtty can be replaced by other modes, they will not run on the 50 plus old mechanical printers and the demodulators that go with them. Just as some like to run AM on the ham bands. Not that good of a use of bandwidth, but just something to play with that many enjoy. I doubt that many hams that run the digital modes can really type very fast and depend on the micros in the programs. For the ones doing it in real time, psk31 probably has enough speed.
Re: [digitalradio] Re: Olivia vs. RTTY vs. PSK spectrum efficiency
From: J. Moen j...@jwmoen.com To: digitalradio@yahoogroups.com Sent: Tue, July 20, 2010 8:33:06 PM Subject: Re: [digitalradio] Re: Olivia vs. RTTY vs. PSK spectrum efficiency I completely understand the lure of the old mechanical teleprinters. But I have to say I was surprised at my reaction to the addition of RTTY to the firmware in my NUE-PSK modem. I typically use the NUE-PSK battery powered plugged into my 817 while doing QRP in the field. I don't need to lug along a laptop to do PSK31. Apparently it was easy for them to add RTTY support, and by golly, I found myself doing the occasionally RTTY QSO using this little device. And it was fun. I would not have guessed a modern little device like the NUE-PSK would ever support RTTY, and I would not have guessed I'd get a kick out of it. I mean, I still prefer other digital modes, but RTTY once in a while can be fun too, I've discovered. Jim - K6JM I have an old mechanical printer that dates back to around 1945. Still works fine. I let it run just to watch it work. Sometimes it is interisting to compair the print of the old 1970 something homebuilt modem and mechanical printer with the modern sound card programs. The NUE-PSK should not be hard to impliment rtty on. I wrote a program to run on an 8080 processor board that only had 1 K of ram and 2 K of rom in it about 30 years ago. I did have an external modem to convert the tones to pulses. Same one that worked the mechanical printer. While the NUE-PSK looks interisting, I have a small netbook computer that will run all the sound card programs. If you have to have a keyboard, the netbook is not much larger with its 10 inch screen. . A small interface box handles the audio interface.
Re: [digitalradio] Re: RTTY and common courtesy
Let me get this right. You want a station to ask if the frequency is in use. That is understandable except he will be on RTTY and you are on another sound card mode. Many times stations do not even have the audio running now. They are just looking at a digital display and clicking on the signals. If it does not look like a rtty signal then it is ignored. I don't do contest either except for some at field day and some vhf and above contest. - Original Message From: KB3FXI kb3...@yahoo.com To: digitalradio@yahoogroups.com Sent: Sun, July 18, 2010 12:57:03 PM Subject: [digitalradio] Re: RTTY and common courtesy I agree. And while I have little or no interest in contesting, I can appreciate it as being a big part of amateur radio and does have value in practice and experience in understanding exchanges and band conditions/propagation. And for a great many people, it's just plain old fun. But, there's really no excuse for ops to just pop on a frequency that is in use. What the 3 ops did on the net I was participating in last night was really inexcusable. I helped with a special event station yesterday and on ever qsy I first listened and put out 3 calls asking if the freq was in use. This procedure took about 1 minute of my time and I was assured that I was not interfering with a qso in progress. It's just common sense and common courtesy. -Dave, KB3FXI
Re: [digitalradio] Individual software programs for various digital modes????
MMTTY is a good stand alone RTTY program. I don't work Olivia so can not comment on that one. http://www.muenster.de/~welp/sb.htm Is a good place to look for many of the sound card modes. Many programs are free. - Original Message From: JLA johnne...@yahoo.com To: digitalradio@yahoogroups.com Sent: Tue, June 15, 2010 4:40:20 PM Subject: [digitalradio] Individual software programs for various digital modes Hi All, I've been lurking a while and I've not found a clear (to me anyway) discussion of small, individual digital mode software programs, e.g., one program for RTTY; one program for Olivia, etc, etc... I have a 7200 and I am not at all interested in computer control of my rig. Neither am I interested in a software suite with a zillion bells and whistles that I will never, ever use. I am neither a contester nor DX-er. I doubt very, very seriously if I will ever work any digital modes other than Olivia and RTTY. My only current digital software program is MRP40 which is FB for QRQ CW especially in bad/weak signal conditions. It is worth every penny to me as I can not copy CW at the faster rates (25+ wpm.) Any guidance/advice anyone has will be greatly appreciated. 73 de W1YB Johnne Lee
Re: [digitalradio] SSTV AMPLIFIER
Is this for a FM or SSB transmitter ? If FM then any amp should do. If you are using a SSB transmitter and feeding it the audio for SSTV then you need an amp that is linear. I would guess that most of your sstv transmissions are not too long (say less than 30 seconds) so the duty cycle should be low. - Original Message From: obie47165 obie47...@yahoo.com To: digitalradio@yahoogroups.com Sent: Mon, May 24, 2010 9:10:19 AM Subject: [digitalradio] SSTV AMPLIFIER Any suggestions for a amp vhf for SSTV I inquired with MFJ...and they said NO, for sstv on their line of amps. Any help appreciated... POB/K8LEN
Re: [digitalradio] Re: Question for experts
- Original Message From: rein...@ix.netcom.com rein...@ix.netcom.com To: digitalradio@yahoogroups.com Sent: Tue, March 9, 2010 11:51:52 PM Subject: Re: [digitalradio] Re: Question for experts Hi Ralph, You got me again. Indeed the Commission requires that it has to be intelligent information, and certainly any ID needs to be made in the English language or in Morse code, not quite sure about Morse only, or other methods allowed. One could speak as a member of an Indian tribe as was done in WWII as long as the the ID was in English, Germans and Japanese had a lot of trouble with that sort of communication, would that make it perhaps SS if it was done on the wireless? If I listen to smears of rattle, many Khz wide below 14.001 or so ,most of the time one can hear at the end an Id in CW. When I run WSJT, I ID in CW every couple of minutes. Lets say, it were a number of tones, no particular order looks like it, but I could down load a piece of nice freeware from the internet and it all became intelligent info what then? 73 Rein W6SZ. * The content of the signals and the modulation of the signals are getting confused. The tones you are sending out must conform to some type of acceptabel modulation. The content does not even have to make sense. Some examples are , you can not transmitt music, but you can send ascii characters. If music is converted into ascii data or just a bunch of 1's and 0's and sent and then reconverted at the receiving end , you have just sent data as far as the FCC sees it. In reality you have sent a music file , but not music. It will become music when the computer converts the data file back to music. Another example is a RTTY picuture or ascii art. This looks like a random ammount of numbers and letters. If you step back and look at the paper comming off a real teletype machine, you have a picture. I have sent many of the rtty pix in years past.
Re: [digitalradio] Re: 1976 FCC - Delete all Emission Types from Part 97
From: KH6TY kh...@comcast.net To: digitalradio@yahoogroups.com Sent: Tue, March 9, 2010 2:08:20 PM Subject: Re: [digitalradio] Re: 1976 FCC - Delete all Emission Types from Part 97 Julian, Using FSK instead of AFSK means you can run a big amp Class-C and get more power output. Also, you do not have to worry about preserving linearity on a Class-AB or Class-B amplifier if running FSK,or figure out how to interface the computer to the rig for AFSK. You do not seem to understand how the so called AFSK works for RTTY. Using any clean transmitter and pure sine wave tones the signal comming out of it will be the same if true FSK or AFSK is used. The amp can be the same class in either case.
Re: [digitalradio] Re: Question for experts
- Original Message From: rein...@ix.netcom.com rein...@ix.netcom.com To: digitalradio@yahoogroups.com Sent: Tue, March 9, 2010 5:11:30 PM Subject: Re: [digitalradio] Re: Question for experts Hello Jose, Multiple Frequency Shift Keying, OK, but you really did not answer my question, I think. Suppose I replaced the modulation device with a filtered piano ( no harmonics ) a microphone. I am serious, trying to find out the question we can't address here any longer. I used a x-tal oscillator. Limited my BW to some 300 Hz 73 Rein W6SZ - If you are doing what I think, you have just built a complicated CW transmitter. Start with a crystal oscillator, go to a ballanced modulator and then filter out one sideband. This is similar to how cw is often generated in a SSB transceiver.
Re: [digitalradio] Re: Question for experts
Correct but you still have not answered my question. Indeed If I use one tone and key it on / off I have a cw transmitter, transmitting on the VJO frequebcy = or - the audio frequency. What do I have if I just change the tones in a random fashion? 73 Rein W6SZ If a total random fashion, then you have a bunch of junk. It will not convey any useful information and probably illeagle in the ham bands. There must be order to it to convey any useful information.
Re: [digitalradio] The cost of digital mode interfaces
The basic sound card interface has never been very high. Look for one called Rascal. Here is one link to where to get them. http://www.packetradio.com/ I don't recall the price from years ago, but it was under $ 50 then. The kit was even less. Almost just the cost of the parts if bought in single lots. - Original Message From: Andy obrien k3uka...@gmail.com To: digitalradio digitalradio@yahoogroups.com Sent: Sat, March 6, 2010 8:34:05 AM Subject: [digitalradio] The cost of digital mode interfaces I was helping a ham get set-up for digital modes recently and turned to the issue of interfaces for digital modes. I researched the price for a Rigblaster Pro and was shocked that they sell for $299. My friend settled for another interface that cost $69, new. I was wondering about interfaces and wondering about whether the era of high priced interfaces might be coming to an end. I'm not talking about the ones that have extra features like electronic CW keying, high end soundcards , etc etc. I'm thinking that a device that has connectors, isolation circuits, pots, and a good solid enclosure, should be in the under $100 range. I know you can build your own for $20 or so, It is nice to see that many low price options exist nowadays. Andy K3UK
Re: [digitalradio] RTTY and mode selection on radios
--- On Fri, 2/19/10, James French w8...@wideopenwest.com wrote: From: James French w8...@wideopenwest.com Subject: [digitalradio] RTTY and mode selection on radios To: digitalradio@yahoogroups.com Date: Friday, February 19, 2010, 3:58 PM Wondering if someone can point me to a link or some literature explaining about why there is a FSK mode on the HF radios like the Icom ic-746pro, Kenwood TS0940sat, and Ten-tec Paragon (585)? Is there a reason for this? I am asking this because I have listened to some RTTY using either USB or LSB dependent on what band I am on and could copy it with any software programs I have but then switched to the FSKmode on the radios and loose the signal completely. Is this mode just for the older ancient RTTY eqiupment to interface with the radio? I haven't tried to send any RTTY yet but planning to be on the air next weekend for the NAQP RTTY contest from the Red Cross station in Ann Arbor,MI. James W8ISS RTTY should not be referred to as afsk even if audio is fed into a ssb radio. What comes out of the transmitter is the same if true FSK or AFSK is used. Whoever started that wording should be shot. It is AFSK if AM or FM is used. For the ham bands rtty should be received and transmitted in the LSB mode on all bands if ssb is used.YOu can set the tones up in reverse and use usb, but it is not recommended. When you switch from lsb to the rtty mode, most receivers will shift up or down 2125 hz if you have it set up correctly. That is what the mark tone should be. Actually any two tones can be fed into a ssb transmitter as long as they are 170 hz apart. The lowest tone should be around 1500 hz or so as the second harmonic of it will be out of the pass band of the filter. The station on the other end will not know the differance, just your dial frequency will not match his. RTTY was origionally sent on the low bands by shifting the frequency of the transmitter lower in frequency when the space was sent. When ssb transceivers came into use it was found that if you put a pure sine wave into the microphone input you generated just a single output frequency. If that audio tone was changed a small ammout the frequency of the output would change the same ammount. If usb is used the frequency would shift up and if lsb was used the frequency would shift down. LSB is used to keep everything the same weather the shift was the actual carrier or if audio tones are used. You have to have a good understanding of how a single frequency fed into a ssb transceiver will change the output frequency to understand rtty.
Re: [digitalradio] Netbook or Laptop better?
--- On Mon, 2/15/10, kd0ca kd...@arrl.net wrote: From: kd0ca kd...@arrl.net Subject: [digitalradio] Netbook or Laptop better? To: digitalradio@yahoogroups.com Date: Monday, February 15, 2010, 11:08 AM I run MultiPSK Ver 3.13 on a VERY old IBM ThinkPad running Win98 at 166 MHz. I'd like to get a newer, faster, better laptop. Is there any disadvantage to using a netbook as compared to an actual laptop notebook? 73 Thanks, Jerry KDØCA Washington, IA It is all in what you want to do. If you only want to run digital modes on ham radio (espically portable) and no or very few other applications, the netbook is fine if you do not mind a small display and smaller keyboard. It does not take too much of a cpu to run many of the ham applications. I have a netbook Asus 1000. It works fine for what I uses it for, but I do have a regular desktop computer to use for serious applications. If it was the only computer I had, I would go with a regular laptop. I do like the long battery life of this modle. Something around 6 to 9 hours depending on usage. While I could add an external dvd or other devices, I have not done that. I have gotten a TV/FM radio thing that cost about $ 60 to make it a TV receiver.
Re: [digitalradio] Fw: [KA9QJGREPEATERS] Differences between netbooks notebook/laptob computers
--- On Sun, 12/6/09, Andy obrien k3uka...@gmail.com wrote: From: Andy obrien k3uka...@gmail.com Subject: Re: [digitalradio] Fw: [KA9QJGREPEATERS] Differences between netbooks notebook/laptob computers To: digitalradio@yahoogroups.com Date: Sunday, December 6, 2009, 10:24 AM A timely post with Christmas soon upon those that celebrate this gift-giving holiday. I was thinking about a Netbook for my teenage daughter but with a full featured laptop only $50 more, I opted for the laptop. For portable digital mode ham operations though,a netbook might be quite useful. Andy K3UK I have a Asus netbook and it will run the most common digital modes of psk31 and rtty without any problems. I would not recommend the netbook to take the place of a 'real' computer. They are handy to carry with you. There is a lot of stuff in a small package, but to get the battery life the speed is not too fast. However, they are plenty fast for small applications if only running one program at a time. I have ran Skype without any problems. I also have an external TV tuner that works well with it. I like the fact the battery life is very long compaired to the normal laptop. About 6 hours or more depending on the usage. Also it has everything built in except for a cd/dvd drive. They can be bought for about $ 50. I don't have one as I have not found a need for one yet. If I want to load some softwear I put the disc in the desktop and use the wireless router to install the softwear. The screen is small and it takes good eyes. Also in the 1024x768 mode (think that is the one) I only get about 2/3 of a page on the screen and have to scrool down to see the rest of the page. Most digital modes do not take that much of a computer, I ran psk31 on an old 486 computer not too long afer psk 31 came out. Ran rtty on less of a machine than that. As with anything, you have to know what it will do and what it will not do .
Re: [digitalradio] Re: An open letter: W1AW and 80m psk31 interference
--- On Thu, 9/24/09, theophilusofgenoa twst...@windstream.net wrote: From: theophilusofgenoa twst...@windstream.net Subject: [digitalradio] Re: An open letter: W1AW and 80m psk31 interference To: digitalradio@yahoogroups.com Date: Thursday, September 24, 2009, 11:24 AM I would like to put in a few words in defense of the ARRL. I learned the code prior to getting my novice license in 1955. At the time, that was just about the only way one could learn, at least on a kid's salary. These transmissions have been on forever, so I do question Why is the code practice sessons even needed now ? In 1955 very few probably had tape recorders or an easy method to get perfect code practice. Now you can get a computer for almost nothing (some will even give you an old computer just to get it out of the house). I gave one away to a fellow years ago just so he could run a code program.
Re: [digitalradio] Has anyone tried the ASuS EEE pc 901?
--- On Mon, 6/22/09, jeffnjr484 jeffnjr...@yahoo.com wrote: From: jeffnjr484 jeffnjr...@yahoo.com Subject: [digitalradio] Has anyone tried the ASuS EEE pc 901? To: digitalradio@yahoogroups.com Date: Monday, June 22, 2009, 11:24 AM Hello, Has anyone used the ASUS laptop for psk31 or any digital modes im looking at it for some portable ops http://www.amazon.com/gp/product/B001BYD178/ref=noref?ie=UTF8s=pc It looks like a neat computer and the price is outstanding just wanted to know if anyone has tried it jeff kd4qit The 901 should be just fine for the digital modes. I have the ASUS 1000HE which is just about the same computer except for the hard drive vers the solid state memory and a few extras. I have used Digipan and several other programs for psk31 with no problem. Runs mmtty fine. If you do not have a usb to serial port adaptor you may not be able to control the rig. Some of the interface units come with the adaptors for this. It does not really take much of a computer to run basic psk31. I have ran psk 31 with some 200 mhz desktop computers years ago.
Re: [digitalradio] sstv
--- On Fri, 6/5/09, ronaldfparmenter ronaldfparmen...@yahoo.com wrote: From: ronaldfparmenter ronaldfparmen...@yahoo.com Subject: [digitalradio] sstv To: digitalradio@yahoogroups.com Date: Friday, June 5, 2009, 2:02 PM what mode do i set too for sstv ?? I assume you are asking what mode to set your transceiver to for sstv. If so you set it to usb on 20 meters. One normal way is to set it so you are copying the stations in voice and you will be in the correct mode when the sstv starts. One frequency to look for is 14.230 or 14.233.
Re: [digitalradio] HF RTTY help
--- On Wed, 5/27/09, Christopher K. Greenhalgh ch...@n8wct.com wrote: From: Christopher K. Greenhalgh ch...@n8wct.com Subject: [digitalradio] HF RTTY help To: digitalradio@yahoogroups.com Date: Wednesday, May 27, 2009, 5:29 PM Hello all! Newbie to the group, and to HF RTTY as well, and have a question... My equipment is an Icom 746 Pro interfaced with a Kantronics KAM+. The terminal software is XPWare. I'm an old school packeteer, so I know I have every thing installed correctly (it works fine on the VHF side) and I have all the correct parameters (45 baud, shift/mark/space tone freqs, ect)in place when I go over to do RTTY. Okay, so I start tuning around 14.080 USB, and can clearly hear RTTY tones. I use the KAMs meter to home in on the signal, but when I get there, I just get gibberish to the screen. I know its trying to decode it, as the gibberish will go away if I tune off just a little bit. I've been messing with this for a week...any ideas? Thanks much! 73. -Chris First thing switch over to lsb or use the reverse switch (probably softwear function). Normal ham rtty is transmitted (when using the audio tones) by sending in lsb and you should receive there also. I won't get into it here,but ham rtty is usually sent with the 'space' lower in frequency than the 'mark' frequency. It was started before ssb transmitters were common. In order to reverse the audio comming out of the receiver you must transmitt and receive in lsb if using the normal audio tones of 2125 and 2295. If you are using FM on vhf then you will normally set the audio tones so mark is 2125 and space is 2295.
Re: [digitalradio] Re: Modes - What are they and What about New Developement??
--- On Sun, 2/22/09, Gmail - Kevin, Natalia, Stacey Rochelle spar...@gmail.com wrote: From: Gmail - Kevin, Natalia, Stacey Rochelle spar...@gmail.com Subject: Re: [digitalradio] Re: Modes - What are they and What about New Developement?? To: digitalradio@yahoogroups.com Date: Sunday, February 22, 2009, 7:43 PM Andrew, Now that you mention it I have heard of DSB suppressed carrier, but none of the others. But isn't DSB acutally AM? Either with or without the carrier? I will have to look at this. I will have to have a look at these other modes, couple of them sound interesting. Thanks for the info Kevin, ZL1KFM. DSB can be thought of as AM with the carrier removed. SSB is usually one sideband with the carrier removed. You can have ssb and a carrier and pick it up on a normal AM receiver. If you insert the carrier to a DSB signal then you have normal AM. It is sometimes a play on words. SSB is normally thought of as one sideband and supressed carrier. DSB is usually both sidebands and supressed carrier. AM is both sidebands and the carrier.
Re: [digitalradio] HAL ST-8000A to Teletype ASR33
--- On Sun, 11/30/08, Steve Ripper [EMAIL PROTECTED] wrote: From: Steve Ripper [EMAIL PROTECTED] Subject: [digitalradio] HAL ST-8000A to Teletype ASR33 To: digitalradio@yahoogroups.com Date: Sunday, November 30, 2008, 12:01 AM I have a HAL ST-8000A and recently purchased a Teletype ASR33 and want to use these for receiving RTTY. I am looking for anyone who may have, or know where I can find, information on how to properly hookup the HAL to the Teletype. Any information or direction would be greatly appreciated. Regards, Steve R. [EMAIL PROTECTED] I can't help on the hook up. I looked at the St-8000 write up and did not see that it had way to convert 5 level to 8 level signals. Most rtty on the ham bands is going to be 60 wpm (45.45 baud) 5 level data. The ASR33 is a 8 level ASCII printer if I remember corectly. I think it is a ASR32 that is the 5 level Baudot printer.
Re: [digitalradio] Re: ASCII ?
--- On Wed, 10/1/08, hankvond [EMAIL PROTECTED] wrote: From: hankvond [EMAIL PROTECTED] Subject: [digitalradio] Re: ASCII ? To: digitalradio@yahoogroups.com Date: Wednesday, October 1, 2008, 8:30 PM --- In digitalradio@yahoogroups.com, John Becker [EMAIL PROTECTED] wrote: Why did ASCII fail to catch on? Just curious! 73, John, K9MM Hi John, Probably because ASCII requires separate equipment. The standard TTY would not do ASCII and the home computers of 1980 would were a little too software challenged. Hank - KI4UMX The computers would handle rtty with no problem. I wrote a rtty program on an old 8080 computer mother board that only had about 2 K of rom and 1 K of ram to do the program. Could do 60 and 100 wpm. I was using a ST-6 to send the pulses to the computer and generate the tones. The old computers often used the 110 (think that is the speed) ASCII for the input/output hard copy. That same 8080 was used to decode the ascii from W1AW when they sent it. The old Comodore and Radio Shack computers could handle that slow speed with no problem. I am sure there were several reasons the ASCII did not make it. The slower 60 WPM Baudot gave fewer errors than the faster speeds. Most hams could not type 60 wpm or faster. There was already much Baudot equipment out. The mechanical ASCII devices cost a lot more.
Re: [digitalradio] ASCII ?
--- On Wed, 10/1/08, John Becker, WØJAB [EMAIL PROTECTED] wrote: From: John Becker, WØJAB [EMAIL PROTECTED] Subject: Re: [digitalradio] ASCII ? To: digitalradio@yahoogroups.com Date: Wednesday, October 1, 2008, 9:56 PM Rick I agree about your ASCII comment but as far as RTTY goes, just about anyone can copy it with machine (as I still do) or by computer. Did you ever notice that the ARRL bulletins still to this day put a CR/LF at the end of a 70 letter line. Still a lot of machines out there still working after all these years. Gee it would be so nice if the software writers would do the same. John, W0JAB Yes, it would be nice if they did. About 20 years ago I wrote a simple rtty program for an 8080 processor. I programmed it to send a cr/cr/lf after 60 characters and then the next space between words. If the word hapened to be longer than 12 or so characters, then it would do a forced cr/cr/lf at 72 characters. I could also defeat this if I wanted to for the pix mode. I am not a programmer and if I can do this, I am sure others could do it.
Re: [digitalradio] SignaLinkUSB freq response and S/N
--- On Wed, 9/3/08, Russell Hltn [EMAIL PROTECTED] wrote: From: Russell Hltn [EMAIL PROTECTED] Subject: Re: [digitalradio] SignaLinkUSB freq response and S/N To: digitalradio@yahoogroups.com Date: Wednesday, September 3, 2008, 1:29 PM On Wed, Sep 3, 2008 at 6:11 AM, Peter G. Viscarola [EMAIL PROTECTED] wrote: Now, in terms of S/N ratio... I find it hard to believe that quieter isn't better no matter how you look at it. But at what point does it become insignificant? I've heard of people using low-noise preamps on antennas, but never low-noise audio amplifiers. (Is this because we compress the signal with the RF and AF gain controls?) Is the quest for low noise audio cards the equivalent of seeking gold-plated, oxygen-free, 10 Guage speaker wire for our rigs? This should be a straightforward math question for a rig designer. But I'm not a rig designer. Anyone know? The noise induced by all the stages from the antenna to the speaker play a part in the overall noise figure or noise factor.A long run of coax can have noise to add even though it is a passive component and not an active device. There is a long drawn out formula to determine the overall noise factor. Hopefully the first stage or two is low enough and has enough gain to override the following devices such as the mixer, IF and AF amps of the receiver. Low noise stages in the audio will help, but you night not notice the help. Sort of like if you have a truck load of bricks and add one more brick. You know it is there, but it takes some special weighing equipment to notice it. The driver of the truck would not know you added it by the way the truck drives. Here is a link to the formula. http://en.wikipedia.org/wiki/Noise_figure In very low noise systems (say less than 2 or 3 dB )even the noise in the coax is the limiting factor and not the loss of the coax. No mater how much gain you have , you can not pull a signal out that is less (maybe much less) than the noise without special equipment. A well designed system will balance the gain and noise factors of each stage. For the low bands usually there is usually enough atmospheric, man made and other noise that a very low noise figure is not needed. Even the antenna will see enough of the earth to limit the signal to noise ratio. You see number of around 270 deg K as the average temperature. The antenna will pick that up due to the heat of the earth. By having a good beam that is pointed above the earth such as a satellite dish , the antenna noise will go down and preamps in the 30 to 60 deg K will work. I am sure the oxygen free, gold plated #10 guage speaker wires will help, but it is like a fly landing on that brick truck. Maybe more like the fly on the brick truck taking in a breath of air.
Re: [digitalradio] Re: New Hams and New Digital Technology
--- On Thu, 7/3/08, tailfeathers [EMAIL PROTECTED] wrote: From: tailfeathers [EMAIL PROTECTED] Subject: Re: [digitalradio] Re: New Hams and New Digital Technology To: digitalradio@yahoogroups.com Date: Thursday, July 3, 2008, 4:03 PM PSK software is simple to use and free everywhere...Is the same software available free for these other modes? Gary n8gsj There are many free programs for most modes. Here is a place that list many of the sound card programs, many for free. http://www.muenster.de/~welp/sb.htm
Re: [digitalradio] Signal on 3850
I am located in the middle of North Carolina, USA --- On Tue, 5/13/08, John Simon [EMAIL PROTECTED] wrote: From: John Simon [EMAIL PROTECTED] Subject: Re: [digitalradio] Signal on 3850 To: digitalradio@yahoogroups.com Date: Tuesday, May 13, 2008, 10:59 PM Ummm, where are you? I can't hear anything here in VK. John de VK2XGJ Stop worrying about Life You'll never get out of it alive - Original Message - From: Ralph Mowery [EMAIL PROTECTED] To: digitalradio@yahoogroups.com Sent: Wednesday, May 14, 2008 12:23 PM Subject: [digitalradio] Signal on 3850 A friend told me to lisen on 3850 lsb +- a kc or two. There is some digital type signal there. Does anyone know what it is and where it is comming from. 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 No virus found in this incoming message. Checked by AVG. Version: 8.0.100 / Virus Database: 269.23.16/1431 - Release Date: 5/13/2008 7:55 PM 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
Re: [digitalradio] Signal on 3850
John my call is in the yahoo address. So is my real name. As you have a VK call I can understand you not reconising the call of KU4PT being a valid ham call and where it may be. Also as for many years in the USA even having a call with a 4 in it does not mean that I am even in the Southern part of the USA. I hate the FCC did that to us. 73 de KU4PT --- On Wed, 5/14/08, John Simon [EMAIL PROTECTED] wrote: From: John Simon [EMAIL PROTECTED] Subject: Re: [digitalradio] Signal on 3850 To: digitalradio@yahoogroups.com Date: Wednesday, May 14, 2008, 6:39 AM The msg has no signature, no Call, no identification whatsoever. That is why I asked the question. John de VK2XGJ Stop worrying about Life You'll never get out of it alive - Original Message - From: Ralph Mowery [EMAIL PROTECTED] To: digitalradio@yahoogroups.com Sent: Wednesday, May 14, 2008 8:17 PM Subject: Re: [digitalradio] Signal on 3850 I am located in the middle of North Carolina, USA --- On Tue, 5/13/08, John Simon [EMAIL PROTECTED] wrote: From: John Simon [EMAIL PROTECTED] Subject: Re: [digitalradio] Signal on 3850 To: digitalradio@yahoogroups.com Date: Tuesday, May 13, 2008, 10:59 PM Ummm, where are you? I can't hear anything here in VK. John de VK2XGJ Stop worrying about Life You'll never get out of it alive
[digitalradio] Signal on 3850
A friend told me to lisen on 3850 lsb +- a kc or two. There is some digital type signal there. Does anyone know what it is and where it is comming from.
Re: [digitalradio] Going Digital
--- Andrés Arrieta [EMAIL PROTECTED] wrote: Hi, I'm new into HAM radio, I've investigated about digital comms but now all my ideas are mixed up. For an easy start what do I buy to do some PSK31 and FSK. I have a Kenwood TS-450S. Sorry if this is a stupid question but I'm desperate. You need a way to get the audio from the transceiver to the computer and from the computer to the transceiver. Just to receive the psk31 you can lay the mic of the computer next to the speaker of the transceiver. Here is one place to look for an interface; http://www.buxcomm.com/select.htm Also look up Rig Blaster. After that you need a program to do the decoding and sending audio to the transceiver. Many free programs can be found here: http://www.muenster.de/~welp/sb.htm For psk31 you will set your rig to about 14.070 USB and use the sound card program and the computer to find the signal you want. There are other frequencies, but this is a good starting place. Special deal for Yahoo! users friends - No Cost. Get a month of Blockbuster Total Access now http://tc.deals.yahoo.com/tc/blockbuster/text3.com
Re: [digitalradio] Re: Operating FSK RTTY in a contest ?
--- Robert Chudek - K0RC [EMAIL PROTECTED] wrote: Andy, Regarding matching the RTTY tones... matching a tone is difficult for some people and easy for others. For example, some people sing off key! Were you good at matching the note of the pitch pipe in music class? :-) You said some RTTY signals did not sound the same as yours. I heard this as well, and one was so blatant I had to look at my scope! The reason for this dissimilar sound is because some fellows overdrive their transmitter audio input when using AFSK. This generates distortion, harmonics and secondary signals. I hear this during every RTTY contest and last weekend was no exception. A bad soundcard or driver could be a potential problem as well, but not as likely as excessive mic gain. If a RTTY signal is generated by AFSK and the audio is not pure, it will sound different from good 2125 and 2295 tones. It's the same principle that a middle C note on a violin sounds different than the same note on a clarinet. Both instruments produce the same fundamental frequency, but each has its unique signature of harmonics and overtones that allow you to easily distinguish between them. So now you know why a lot of RTTY operators say this mode is music to their ears! But why are they called green keys? A piano is black and white. 73 de Bob - KØRC in MN If the tones are not pure sine waves for RTTY when fed into the audio of a transmitter, it is probably not legal. They will generate all sort of junk on the bands just as you mentioned. Even more so if the audio is overdriven. As far as the green keys, the computer boys will never know unless someone takes the time to explain the mechanical teletype machines have keys that are acutally collored GREEN. DE KU4PT Never miss a thing. Make Yahoo your home page. http://www.yahoo.com/r/hs
Re: [digitalradio] Software Development [was] Logging for MultiPSK and DM780
--- John Becker, WØJAB [EMAIL PROTECTED] wrote: Speaking of, I (and others) sure wish when writing RTTY software you developers would add or force a CR/LF after 70 charters. I really don't think the glass operators would notice or mind. And us using paper would notice the most since we would not get the pile up at the end of a line. ARRL bulletins are transmitted that way still today. It should not be that hard to do. I wrote a rtty program for an old 8080 processor about 20 years ago that would do that. After about 65 characters it would look for a space and would send two carriage returns, a line feed, and a leters function to be compatiable with the mechanical machines. If it did not get a space, it would force the end of line sequence after 72 charcters. I mostly use the computer sound card interface for most digital work, but do have an old mechanical machine hooked up and it is irriatating to have to watch it to make sure it gets the cr/lf instead of just printing a big black block at the end. Never miss a thing. Make Yahoo your home page. http://www.yahoo.com/r/hs
Re: [digitalradio] Old RTTY machine - force the end of line sequence after 72 charcters
--- Patrick Lindecker [EMAIL PROTECTED] wrote: Hello John and Ralph, If it did not get a space, it would force the end of line sequence after 72 charcters. In Multipsk (and perhaps in other soft) this option exists (button 1 CR/LF/72 char.). It permits to communicate with old RTTY mechanical machine. But this option is OFF by default (you must select it). I remember that this question yet came about one year ago (perhaps two?). 73 Patrick It is good that you can turn the end of line function off and on. I had it that way on my system so I could edit the pix that were sent on the air about 20 years ago. I have not been too active on rtty for the last 5 years. I moved and am just now getting the station back together. Mostly just receiving now and not doing any transmitting lately. I will have to look at the software to see what options are for transmitting. It might just be that the glass rtty users need to be educated as to what is really needed for those of us that have the old mechanical machines. I have the Modle 19 and a home built ST-6 that I use. We use to have a group of about 15 hams on the 220 mhz band and a repeater just for rtty about 20 years ago. 73 de KU4PT Looking for last minute shopping deals? Find them fast with Yahoo! Search. http://tools.search.yahoo.com/newsearch/category.php?category=shopping
Re: [digitalradio] General questions about SSTV
--- Bob Christenson [EMAIL PROTECTED] wrote: Hi guys, I'm looking into SSTV. I see that popular frequencies to operate it are 7171, 7173, 14230 and 14233. Are these pictures sent using an analog or digital method? What popular software is being used? Is there another Yahoo group for this? Thanks for the help. Bob C (WU9Q) SSTV is usually an analog mode. YOu can use the sound card on your computer to work it. Look here for some free programs. http://www.muenster.de/~welp/sb.htm MMSSTV is a popular free program. Set your rig for USB and tune in the hams talking about the sstv. This should put you on frequency. There are many differant modes so you will have to see which one they are sending at the time. YOu may hear them say something like Scotty 1 or such. As with most sound card modes, for receiving you may be able to decode it just by holding the mic from the computer next to the receiver speaker if you are in a quiet location. Looking for last minute shopping deals? Find them fast with Yahoo! Search. http://tools.search.yahoo.com/newsearch/category.php?category=shopping
Re: [digitalradio] Standard sideband for digi modes?
--- Zack [EMAIL PROTECTED] wrote: What is the standard rule for sidebands for the digital modes? Are all bands 160-6 USB (for RTTY, PSK, WSJT, etc)? I have been looking for this info but have not found it. A web link would be very helpful! Thanks Zack N8FNR RTTY in the ham bands is usually LSB on all frequencies. For the comercial bands rtty will be received in the usb mode, or you can use lsb and the reverse mode of the demodulator or sound card program. PSK is mainly USB. Never miss a thing. Make Yahoo your home page. http://www.yahoo.com/r/hs
Re: [digitalradio] A tad off-topic - Excess coax
--- Dave 'Doc' Corio [EMAIL PROTECTED] wrote: Hi, Chuck. Since that is just about the exact dimension for a choke balun from the original Windom design, would it have any effect on the impedance? I suppose I could just wrap it up and see for myself, but thought I should at least be nice enoough to respond, since you took the time to answer my post. Tnx! Dave KB3MOW It should not have any effect. Depending on the size of the coax (rg-8 or rg-58) I would coil it up in a 5 inch to a 1 foot in diameter coil outside the shack. If there is any RF on the outside of the coax, it will help keep it out of the shack. If there is not any rf on the outside of the coax , then it will not have any effect. __ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com
Re: [digitalradio] Re: Current balun
--- Phil Wells [EMAIL PROTECTED] wrote: --- In digitalradio@yahoogroups.com, [EMAIL PROTECTED] [EMAIL PROTECTED] wrote: Dave wrote: I understand the basics of using a balun, but have a question about the specifics. Sorry to have to ask this Dave, but if you understand the basics, why don't you know the difference between a 6:1 and a 4:1 transformer ratio? WOW! What a nice, friendly forum this is! Makes a person want to post questions and learn (but be careful how you WORD those questions... hoo boy) Phil Wells AF6AV Yes, questions need to be worded carefully. I sent about the same type answer back. It was not met to be mean to the poster, but don't state you know more than you do so we can keep the posting back to you on a level you can understand. He wanted to use a balun for a dipole which is usually a 1:1 for a simple dipole and was asking about 4:1 and 6:1 baluns for some reason. A beter wording may have been , I know a balun is for balanced to unbalanced lines, what or when is a current or voltage balune used and what is the differance in the 4:1 and 6:1 baluns? Really just give the situation you have and ask for recommendations may have been beter. __ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com
Re: [digitalradio] Current balun
--- Dave [EMAIL PROTECTED] wrote: I understand the basics of using a balun, but have a question about the specifics. Using a dipole, what would be the difference between using a 4:1 balun compared to a 6:1 balun? Which would I choose, and why would I choose it? Planning on feeding the dipole direct from the tuner in my IC-746 (non-Pro), if that makes a difference. Thanks! Dave KB3MOW Not to be too smart about it, but I don't think you have any understanding at all about a balun. Normally a dipole is around 70 ohms impedance. It may be somewhat lower or higher depending on the height above ground so a 50 ohm coax will usually make a good match to it near the resonate frequency. Most of the time a balun on a dipole is just a waste of material. If you put a 4:1 balun at the center of a dipole you get about a 4 to 1 mismatch and the 6:1 balun will be even worse. I doube that your internal tuner would even tune if the 4:1 or especially the 6:1 balun is used. Most internal tuners will not match much over a 3:1 swr and the 4:1 will probably cuse that much. A 1:1 balun can be used with a dipole to help reduce radiation from the feedline if needed or wanted. The 4:1 or 6:1 baluns are used with antennas that do not come close to 50 to 70 ohms. This could be an off center fed antenna where the impedance is around 300 ohms. __ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com
Re: [digitalradio] AGC and Digital Modes
--- Jon Maguire [EMAIL PROTECTED] wrote: I would like to query the digital mode users regarding the AGC setting. I'm currently running PowerSDR 1.9.1 beta (original SVN), DXLabs Commander interfaced via VComm to a test version of Multipsk. I currently have the AGC set to MED, and I notice that when a strong PSK signal appears in the bandwidth, the AGC really cuts the signals back. I know it's supposed to do that, but I'm curious as to what is an optimal setting for digi modes. Thanks for any help and suggestions. 73... Jon W1MNK The optimal setting is off. Then use the rf gain to cut the signal to the level you want it to be. That is the same on any mode where you have a strong signal close to the receive frequency and it is acting on the agc . Luggage? GPS? Comic books? Check out fitting gifts for grads at Yahoo! Search http://search.yahoo.com/search?fr=oni_on_mailp=graduation+giftscs=bz
Re: [digitalradio] PSK31 freq's for U.S.A. CURRENT......
--- rhettduke [EMAIL PROTECTED] wrote: I've been reading about psk31 for almost a year now.finally got on the air last week and am having so much fun. I have limited my operation to the 20m band.tuning my rig to 14069.5 USB as specified in the digipan set up guideand am working between 14070 and 14072.5.can some one point me to a CURRENT Band Plan chart for PSK31 in the USA.I have just been overloaded with info on the netsome of the information is dated.I'm also curious how wide the PSK31 operation is above the posted frequencys at this time.. thanks KI4OVO There seems to be an up to date chart here. http://www.mostgraveconcern.com/ke7hlr/hfbands/HFBandPlan.pdf If you notice the psk31 for 20 meters is 14.070. The actual frequencies in use will start around there. If you set your transmitter for 14.070 usb, the low frequency response of your rig will not let you see (hear) the first few hundred hz of the normal starting point. That is the reason it is recommended to set your dial to about 500 hz low. Don't worry about the exect setting of the dial. The audio passband is only about 2 khz wide and you may have to tune up in increments of one or two khz to get all the stations. I usually set the dial in increments of 1 khz and just look for the stations with the waterfall display. Don't even care what frequency they are really on. Just be sure to stay in the band you are licened for. The users will normally be close to .o70 but will go up as far as needed, but usually not much over 5 khz unless there may be a contest on. Same with the other bands. Most will stay within the first 3 khz, but may go up more. Get the Yahoo! toolbar and be alerted to new email wherever you're surfing. http://new.toolbar.yahoo.com/toolbar/features/mail/index.php
Re: [digitalradio] Breaking News! HF Enhanced WSJT Software Now Released
There is a period (.) at the end of the first url that must be removed and the site will come up. http://physics.princeton.edu/pulsar/K1JT --- Dave Corio [EMAIL PROTECTED] wrote: Andy, both download sites come back as not found. 73 Dave KB3MOW Andrew O'Brien wrote: Breaking News! HF Enhanced WSJT Software Now Released I will add to the Bozo guide later this weekend.. WSJT Version 5.9.7 (r383) is now available for free download from the WSJT Home Page, http://physics.princeton.edu/pulsar/K1JT. http://physics.princeton.edu/pulsar/K1JT. It should appear We won't tell. Get more on shows you hate to love (and love to hate): Yahoo! TV's Guilty Pleasures list. http://tv.yahoo.com/collections/265
Re: [digitalradio] Digital modes duty cycle and the ft-897
--- Andrew O'Brien [EMAIL PROTECTED] wrote: and some modes are on-off, FSK RTTY versus AFSK RTTY for example, Feld Hell. Andy RTTY is on all the time and is 100 % duty cycle all the time. It does not mater if you are feeding the tones into a ssb audio input or if you are shifting the carrier of the transmitter. At one time very long ago rtty was make break keying but that mode has not been used in over 40 years. Atleast not in any common usage. 8:00? 8:25? 8:40? Find a flick in no time with the Yahoo! Search movie showtime shortcut. http://tools.search.yahoo.com/shortcuts/#news
Re: [digitalradio] NBFM Packet Voice on HF?
--- Danny Douglas [EMAIL PROTECTED] wrote: Why is that? FM is the carrier, afsk is the mode. Just as SSB is the carrier for an AFSK signal. If you can run AFSK on SSB in the other bands, why not 10? Does it specifically say NBFM only for voice? Danny Douglas N7DC ex WN5QMX ET2US WA5UKR ET3USA SV0WPP VS6DD N7DC/YV5 G5CTB all DX 2-6 years each You do not understand what hapens when you send audio tones for rtty into a ssb transmitter. The end result of what comes out of the transmitter can not be distinguished from a true FSK transmitter. That means in effect the transmitter is not putting out AFSK but just FSK. On todays modern transceivers many of them use an audio tone in the USB mode to generate CW. In effect you are really transmitting FSK and not AFSK. If you switch the rig (as many multimode rigs can) to AM or FM then you are transmitting AFSK. This makes it not legal in the data frequencies of the low bands. It's here! Your new message! Get new email alerts with the free Yahoo! Toolbar. http://tools.search.yahoo.com/toolbar/features/mail/
Re: [digitalradio] Understanding QSB ?
--- Andrew O'Brien [EMAIL PROTECTED] wrote: When on phone or CW and experiencing QSB, I do not usually give much thought to other signals nearby on the band. Tonight while watching 20M PSK signals at 22 hours UTC, I watched the whole 3 kHz spectrum come and go in unison. I have never really given QSB much thought, and I know there can be differing factors, but for average QSB (if there is such a thing) does it usually effect whole segments of a band at one time? I would have thought that typical QSB was dependent on how many hops were involved in the signal being received. I guess ir might also have been some local conditions desensing my waterfall. it was NOT due to the presence of one strong signal. Not sure how this relates to your post, but from watching many hours of RTTY with only 170 hz between the tones, I have seen one tone fade and come back in several seconds, then the other tone will do the same thing. This was observed watching an oscilliscope hooked to the mark and space filters of an ST-6 demodulator. __ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com
Re: [digitalradio] Regional communications ?
--- Andrew O'Brien [EMAIL PROTECTED] wrote: My entry in to amateur radio was via 10 meters and the quest for DX, I had no real interest in local communication. Over the years I have had hams ask me to help them set-up their stations for digital mode operation and have occasionally resorted to the lower bands in attempt to help them. Often my attempts to communicate with hams in a 10-50 mile radius has failed. During darkness, I skip over them, and during the day-light we can't hear each other. I know 10 and 20 meter daylight propagation characteristics like the back of my hand, but have no clue about what is normal for 80 and 40M . It seems odd to me that I would have to rely on 2M repeaters to talk to regional hams. What do others on this list do for regional communications on HF? It would seem to me that the digital modes would be ideal for regional use but whenever I get a chance to get someone brave enough to leave 2M chatting alone and try a digital mode on HF, I can't work 'em to help them get set-up. I am familiar with NVIS antennae but do not have a particular NVIS installation, I do not have real estate for 160M either. So what bands and regular antennas do you use for this ? -- Andy K3UK For short ranges try 80 meters and a dipole up about 20 feet. The low antenna will tend to shoot the signal up so it will bounce back down. Also it will tend to be more omindirectional at this low heigth. I use one at this height to talk to some friends about 75 miles away. It is beter for this than an off center fed dipole I have at 50 feet for the near stations. __ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com
Re: [digitalradio] Best sound card for digital
Try the digital modes with what you have. It may work fine for your operations. I have used much slower computers with built in sound cards and they seem to do ok for casual use. 73 de KU4PT --- Leslie Elliott [EMAIL PROTECTED] wrote: Hi - I just joined yesterday, and this is my first post. I am 70 years old, and although I have a fairly good knowledge of electronics due to having worked as a electronics tech and field engineer for many years, I am somewhat computer illiterate, since it was BC (before computers LOL) when I was working in the field. I recently bought a nice Yaesu FT-920 and am currently building a Fox Delta FD-SC1 http://www.foxdelta.com/products/soundcard.htm interface kit to connect to my el cheapo HP Wal-Mart special computer, which has only on board sound. It is a 1.2 Ghz running Windows XP Home Edition SP2. I want to get a better sound card, but don't really know what are the important things to look for. I have read on another forum (HRD, which __ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com
Re: [digitalradio] new to ham radio
--- geobentcpht [EMAIL PROTECTED] wrote: Hello, My name is George Bentley. I have recently received my ham radio operators license. I am looking for software that i can use with my computer. I am new to this and would appreciate any help. thanks George KI4LMI Software to do what ? Here is a place to go for some sound card digital modes. Some free, some shareware. http://www.muenster.de/~welp/sb.htm __ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com Need a Digital mode QSO? Connect to Telnet://cluster.dynalias.org Other areas of interest: The MixW Reflector : http://groups.yahoo.com/group/themixwgroup/ DigiPol: http://groups.yahoo.com/group/Digipol (band plan policy discussion) Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/digitalradio/ * Your email settings: Individual Email | Traditional * To change settings online go to: http://groups.yahoo.com/group/digitalradio/join (Yahoo! ID required) * To change settings via email: mailto:[EMAIL PROTECTED] mailto:[EMAIL PROTECTED] * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [digitalradio] Newbie
--- kd5zxx [EMAIL PROTECTED] wrote: Being a newbie to ham radio and digital in particualr, I would like to at least listen in. Not much in the way fo equipment at the time, but I do have a Kenwood R-1000 receiver with a random length long wire antenna. What is the cheapest and easiest way to get it connected to my computer? Any help would be appreciated. 73's As others have mentioned , just to receive you can place your computer mic next to the speaker of the receiver. Beter may be to have some headphones and put the mic next to the headphone and wrap it with a cloth towl to keep out some of the room noise. Then go here and download some of the free programs that work off the sound card of the computer. http://www.muenster.de/~welp/sb.htm __ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com Need a Digital mode QSO? Connect to Telnet://cluster.dynalias.org Other areas of interest: The MixW Reflector : http://groups.yahoo.com/group/themixwgroup/ DigiPol: http://groups.yahoo.com/group/Digipol (band plan policy discussion) Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/digitalradio/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [digitalradio] different modes
--- barry whittemore [EMAIL PROTECTED] wrote: Hi, i just joined the group. i have been using rtty and some psk31 for a while but would like to know if there is a page that defines the various modes, software available and frequencies to use? thanks barry WB1EDI One of the best places to look for the sound card software is : http://www.muenster.de/~welp/sb.htm Much of it is free. __ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com Need a Digital mode QSO? Connect to Telnet://cluster.dynalias.org Other areas of interest: The MixW Reflector : http://groups.yahoo.com/group/themixwgroup/ DigiPol: http://groups.yahoo.com/group/Digipol (band plan policy discussion) Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/digitalradio/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [digitalradio] 16 bit sampling?
--- kc0rdg [EMAIL PROTECTED] wrote: Would anyone know if it's possible to use less than 16 bit sampling and still be able to decode digital modes such as RTTY and PSK? I don't mean the sample rate, such as 11025 used in MixW, I mean the digital sampling of the actual audio. Can't say about most modes, but for CW and RTTY you should be able to do it with much less. There used to be a circuit and prigram called the hamcom interface that was just an opamp that squared up the signal (level converter) and fed it into the serial port. Not sure if you call that one or two bit sampling. __ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com Need a Digital mode QSO? Connect to Telnet://cluster.dynalias.org Other areas of interest: The MixW Reflector : http://groups.yahoo.com/group/themixwgroup/ DigiPol: http://groups.yahoo.com/group/Digipol (band plan policy discussion) SPONSORED LINKS Ham radio Craft hobby Hobby and craft supply YAHOO! GROUPS LINKS Visit your group "digitalradio" on the web. To unsubscribe from this group, send an email to:[EMAIL PROTECTED] Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
Re: [digitalradio] Re: Mono mic input?
--- kc0rdg [EMAIL PROTECTED] wrote: Maybe I should have clarified more... If I use a mono jack with a mono sound card, will I be able to decode RTTY, PSK and the other digital modes? There is no reason you shouldn't. The sound comming out of the radio is mono. Only one side is used in the sterio sound cards. __ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com Need a Digital mode QSO? Connect to Telnet://cluster.dynalias.org Other areas of interest: The MixW Reflector : http://groups.yahoo.com/group/themixwgroup/ DigiPol: http://groups.yahoo.com/group/Digipol (band plan policy discussion) SPONSORED LINKS Ham radio Craft hobby Hobby and craft supply YAHOO! GROUPS LINKS Visit your group "digitalradio" on the web. To unsubscribe from this group, send an email to:[EMAIL PROTECTED] Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
Re: [digitalradio] FSK the old way
--- Michael [EMAIL PROTECTED] wrote: Hi, Folks, Let's cast our minds back to the days of AM (Advanced Modulation, for those who are unfamiliar with the abbreviation G) rigs and RTTY. Now I know that simple AFSK would work - and provide both sidebands and the carrier and really torture any SSB or true FSK rig going. Not that I'm actually above such things but let's discount that for a moment and look at shifting the transmit carrier as it's supposed to be. Which is kind of where I'm having a small but measurable problem. That problem is that I cannot for the life of me remember how the old FSK exciters worked. And, of course, everything I've found on the web relates to all those new fangled SSB thingies and AFSK and all. So how, for example, did the MD-203 manage the T-195 to make it a RTTY transmitter (as in the AN/GRC-46)? The derisive laughter may now commence. I'm used to it ... *sigh* BEst regards, Michael For most bands below 30 mhz it is not legal to feed the audio into an AM transmitter to run AFSK RTTY. Youdo not generate the FSK RTTY as used on the low bands by putting the audio tones into the mic input like you would with a ssb transmitter. It is still just as hard to run rtty on either transmitter for the same output level. The way it was done was to run the transmitter in the CW mode and switch a capacitor across the VFO or crystal oscillator. Look up a shift pot circuit for details. The capacitor was usually 'switched' with a saturated diode. __ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com Need a Digital mode QSO? Connect to Telnet://cluster.dynalias.org Other areas of interest: The MixW Reflector : http://groups.yahoo.com/group/themixwgroup/ DigiPol: http://groups.yahoo.com/group/Digipol (band plan policy discussion) Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/digitalradio/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [digitalradio] Problem: a (almost) total lack of knowlege.
--- zl1gbb [EMAIL PROTECTED] wrote: Can anyone help me out? I am just getting into digital modes. Very steep learning curve for my 67 year old brain. But I will manage with a little help. My problem is I do not understand the uses of the equipment. My handbook on my radio (ft857d) shows that the radio needs a TNC to work various modes. Another source of information suggests that I should be using a modem (Baycom I think it is). Yet another suggests that at least some of this can be done with the sound card in my computer. But surely all these items are just variations on the same thing i.e. a method of applying audio signals to the baseband of the radio? What the heck does a TNC do that a modem does not? Or a soundcard? If a soundcard can be used for PSK then its stability must be very high. So why can it not be substituted for the TNC? Proberly, the answer is quite obvious but it escapes me. Can anyone help? 73 Graeme zl1gbb To work the digital modes you need to get the audio tones comming from the radio to a display device. Then you need to get from a keyboard to the transmiter. The examples I give bleow are very simple and may not be entirely correct but will show you the general idea. A TNC and modem are similar to each other. The TNC is a box with a computer (dedicated microprocessor) that will allow the incomming signals to connect to a computer by the rs232 or usp ports. It usually converts the incomming signals into the ASCII code the serial port of the computer can use. A modem usually does not have a microprocessor in it. It just converts the sounds to pulses that feed into the computer. The computer program will then decode the on/off pulses to something for the display. The best (cheap way) way to get started is to use the sound card in your computer. Many modes in use now almost require the sound card input. If you don;t want to build up an interface to the computer, you can just put the microphone from your comuter near the speaker of the receiver and run the sound card program. You could do the same for the transmitter but the mic on the transmitter would pick up other noise in the room and it would not be a good thing to do.. Here is a place to get many of the free and shareware programs for the sound card . http://www.muenster.de/~welp/sb.htm Most of the sound card programs are ran with the transceiver in the USB mode. Ham band RTTY is usually ran in the LSB mode. __ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com Need a Digital mode QSO? Connect to Telnet://cluster.dynalias.org Other areas of interest: The MixW Reflector : http://groups.yahoo.com/group/themixwgroup/ DigiPol: http://groups.yahoo.com/group/Digipol (band plan policy discussion) Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/digitalradio/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
RE: [digitalradio] WHY ? ? ?
Sure it does. Switch to USB and the st-6 to 'reverse' and it will receive just fine. If the transmitt tones are set to the reverse it will also transmit just fine while in USB. --- John Becker [EMAIL PROTECTED] wrote: The same does not hold true for those of us still using 1970 equipment like a 28KSR TTY machine and a ST-6 TU. With today's technology, it is not necessary to do this and everything in the military and commercial HF bands is pretty much USB only. So the trend is to just make everything USB and it makes it a lot less confusing as you say because you add the tones instead of subtracting them. 73, Rick, KV9U __ Yahoo! Mail - PC Magazine Editors' Choice 2005 http://mail.yahoo.com Yahoo! Groups Sponsor ~-- Get fast access to your favorite Yahoo! Groups. Make Yahoo! your home page http://us.click.yahoo.com/dpRU5A/wUILAA/yQLSAA/ELTolB/TM ~- The K3UK DIGITAL MODES SPOTTING CLUSTER AT telnet://208.15.25.196/ More info at http:///www.obriensweb.com Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/digitalradio/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [digitalradio] Re: Ideas for posts/masts ?
Can you say more about PVC masts, or point to an article on the subject? I had just never thought of using PVC for masts on the assumption that it would be too flexible to use. If you do use the pvc, look in the electrical section of the store at the grey plastic conduit. It is more UV resistant than the white pvc water pipe. __ Yahoo! for Good Watch the Hurricane Katrina Shelter From The Storm concert http://advision.webevents.yahoo.com/shelter Yahoo! Groups Sponsor ~-- Get fast access to your favorite Yahoo! Groups. Make Yahoo! your home page http://us.click.yahoo.com/dpRU5A/wUILAA/yQLSAA/ELTolB/TM ~- The K3UK DIGITAL MODES SPOTTING CLUSTER AT telnet://208.15.25.196/ More info at http:///www.obriensweb.com Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/digitalradio/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [digitalradio] Wanted, CHEAP !!!! USB-RS232 adapter - Or another Solution
--- Rick Scott [EMAIL PROTECTED] wrote: Want to go portable PSK with my Laptop and have a Rascal KIT RS232 interface for PSK. Anyone know of A CHEAP (AKA XYL radar invisible) USB-RS232 adapter that works (IE Providing the KEYING through RS232 I have now ) Or is there another route I can take? Scotty N7HJ Why don't you just set the transceiver up to use VOX ? No need for the rs232 at all that way. Start your day with Yahoo! - make it your home page http://www.yahoo.com/r/hs The K3UK DIGITAL MODES SPOTTING CLUSTER AT telnet://208.15.25.196/ More info at http:///www.obriensweb.com Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/digitalradio/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [digitalradio] CW
--- mac2251 [EMAIL PROTECTED] wrote: I have a question concerning cw using MixW or Hamscope. Is it legal or not? I have heard both sides. Anyone have the facts.Mike K9HCK As long as it is CW it is legal. If you feed a pure sine wave into a ssb transceiver the output will be the same as a CW signal generated by anyother method. If the waveform has lots of distortion on it and is fed into a ssb transceiver then it will generate lots of sperous signals and will not be legal. It does not mater how how or what method you use to generate the cw signal. Some lowband rigs acutally do this. Internally they use an audio signal into the ssb generator to simulate a cw signal. __ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com The K3UK DIGITAL MODES SPOTTING CLUSTER AT telnet://208.15.25.196/ More info at http:///www.obriensweb.com Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/digitalradio/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [digitalradio] Interface kits
--- Mark Milburn [EMAIL PROTECTED] wrote: I would like to think about having a club project for building interfaces to get some additional members on digital modes. Anybody know of any low cost kits or have any suggestions about such a project? Many thanks for any help. 73 Mark KQ0I Des Moines, Iowa Here is a place to check out. Look under RASCAL kit. http://www.packetradio.com/ Discover Yahoo! Stay in touch with email, IM, photo sharing and more. Check it out! http://discover.yahoo.com/stayintouch.html The K3UK DIGITAL MODES SPOTTING CLUSTER AT telnet://208.15.25.196/ Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/digitalradio/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [digitalradio] Hamshack Hack v.06 just released
--- DavesRadio\RR\ [EMAIL PROTECTED] wrote: would someone explain to me what this Hamshack Hack thing is? bear in mind that I'm an old man and not at all puter litterate so keep it in small words...lol K5DRC BULL SHOALES LAKE http://www.bullshoals.org/lake.htm AR/MO STATE LINE YOu can go to the link in the origional message and download a large file (takes about 30 to 50 minuits on a cable modem) . YOu then burn it to a CD in a bootable format. Then you set your computer to boot off the CD instead of the hard drive. The CD has a version of the Linux operating system on it. There are also some ham programs that you can run from the CD. It is an easy way to play with the Linux operating system for your computer instead of Windows. When you finish playing around, you take out the CD and set the computer to boot off the hard drive and your computer is back the way it was to start with. __ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com The K3UK DIGITAL MODES SPOTTING CLUSTER AT telnet://208.15.25.196/ Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/digitalradio/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [digitalradio] Re:TNCs
--- John Becker [EMAIL PROTECTED] wrote: Good article. I put my service monitor on to the HAL ST-6 just to see how *tight* the filters are. Mark 2125 Hz would drop out +/- 10 Hz. Space 2295 Hz drops out at +/- 12 Hz. the other 2 are 11 and 10 Hz.. What do you mean by drop out ? Filters are not like switches that just turn off and on. If you are using the standard 2 coil filters (one for 2125 and one for 2295 ) then they are very broad. Hooking a scope up to them to get the rtty cross will show very broad elipes instead of almost a single vertical and horizontal line if they were very sharp. __ Do you Yahoo!? Yahoo! Small Business - Try our new resources site! http://smallbusiness.yahoo.com/resources/ The K3UK DIGITAL MODES SPOTTING CLUSTER AT telnet://208.15.25.196/ a href=http://dxcluster.blogspot.com;img src=http://feeds.feedburner.com/DigitalSpotter.gif; height=67 width=200 style=border:0 alt=Digital Spotter//a Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/digitalradio/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
