Re: [digitalradio] Re: ALE-400 - Keyboard mode / ALE
Andy, **However, if ALE-400 ARQ is getting through with error free throughput, what are the chances that Olivia or Thor or some faster mode is getting through with much faster throughput and a only a few errors ? Other than a wider bandwidth, the other mode may turn out more efficient.** That's a good question. If you first start by configuring Olivia and Thor to match ALE-400s 60 wpm speed, you wind up with three modes that have similar minimum signal-to-noise figures and more or less the same robust HF channel characteristics. Running faster versions of Olivia or Thor to surpass ALE-400's speed would decrease the robust quality of those modes even further causing an even greater number of throughput errors. At that point it comes down to whether the print is still readable with the non-ARQ modes under the conditions you mentioned. It's probably a bit simplistic, but I believe the ARQ in ALE-400 can have an advantage over other modes in an apples-to-apples comparison because it constantly checks for throughput errors every few seconds and corrects them as it 'rides' the band changes. When you compare this to non-ARQ modes with similar HF channel characteristics, you realize that a lot of print can be sent by a long-winded operator who is unaware that a large percentage of his message is not making it through; until he turns it over. By that time it's too late and the message needs to be repeated. With ALE-400, checks and balances are made in a matter of seconds for error-free print. Another unique aspect of ALE-400 is it's bilateral operation. Since both stations can type at the same time, text from each station passes back-and-forth ever few seconds allowing the conversation to change directions quickly if need be. The bilateral wpm rate is 85 wpm or 42wpm each way; the standard is 60 wpm unilateral. *I'm waiting for a development where some sort of hand shake or RS-ID initiation at the beginning of a QSO establishes the current SNR. Then on your screen up pops a messages that says... based on the SNR of -11dB THOR11 is recommended, do you want to switch ? That would be something Andy. Tony -K2MO
Re: [digitalradio] Re: ALE-400 - Keyboard mode / ALE
Another unique aspect of ALE-400 is it's bilateral operation. Since both stations can type at the same time, text from each station passes back-and-forth ever few seconds allowing the conversation to change directions quickly if need be. The bilateral wpm rate is 85 wpm or 42wpm each way; the standard is 60 wpm unilateral. Tony -K2MO That is a good point and one I am not sure many people are aware of. Much better than taking turns. Andy K3UK
Re: [digitalradio] QRV RFSM-8000 tonight
I did not transmit afterall, I need to do more research in to the legalities for USA hams. Andy K3UK
Re: [digitalradio] Re: QRV RFSM-8000 tonight
Hello Andy, If RFSM-8000 derives from MIL-STD-188-110A (implemented in Multipsk), it is not legal in USA because the speed modulation is equal to 2400 bauds with a limit of 300 bauds in USA (you can't TX in 110A in USA). It is really a shame. Note: even if the (useful) bit speed is equal to 75 bps, the modulation remains at 2400 bauds. 73 Patrick - Original Message - From: obrienaj aobri...@stny.rr.com To: digitalradio@yahoogroups.com Sent: Monday, October 12, 2009 1:10 AM Subject: [digitalradio] Re: QRV RFSM-8000 tonight I should double check, am I correct that IF we use the 300 baud mode, RFSM is legal in the USA ? Andy K3UK --- In digitalradio@yahoogroups.com, obrienaj aobri...@... wrote: I will be operating RFSM-8000 tonight around to 0200 probably around 7077 or 14077 depending on conditions. I will beacon occasionally and try to remember the baud rate limitation that USA ham have to follow. Hopefully I can test a few transfers with someone. Andy K3UK Announce your digital presence via our Interactive Sked Pages at http://www.obriensweb.com/sked Recommended digital mode software: Winwarbler, FLDIGI, DM780, or Multipsk Logging Software: DXKeeper or Ham Radio Deluxe. Yahoo! Groups Links
[digitalradio] Re: QRV RFSM-8000 tonight
Thanks Patrick, I guess we will have to lobby for some changes. Andy --- In digitalradio@yahoogroups.com, Patrick Lindecker f6...@... wrote: Hello Andy, If RFSM-8000 derives from MIL-STD-188-110A (implemented in Multipsk), it is not legal in USA because the speed modulation is equal to 2400 bauds with a limit of 300 bauds in USA (you can't TX in 110A in USA). It is really a shame. Note: even if the (useful) bit speed is equal to 75 bps, the modulation remains at 2400 bauds. 73 Patrick
Re: [digitalradio] Re: QRV RFSM-8000 tonight
So what would be the lowest band we could use it on? 10 meters? 6 meters? Higher? Bill, WA7NWP On Mon, Oct 12, 2009 at 4:19 PM, obrienaj aobri...@stny.rr.com wrote: Thanks Patrick, I guess we will have to lobby for some changes. Andy --- In digitalradio@yahoogroups.com, Patrick Lindecker f6...@... wrote: Hello Andy, If RFSM-8000 derives from MIL-STD-188-110A (implemented in Multipsk), it is not legal in USA because the speed modulation is equal to 2400 bauds with a limit of 300 bauds in USA (you can't TX in 110A in USA). It is really a shame. Note: even if the (useful) bit speed is equal to 75 bps, the modulation remains at 2400 bauds.
[digitalradio] QRV digital -- cloud warmer on 80 meters
All, Couldn't wait to get my 80 meter end-fed up today so we installed it temporally as a cloud-warmer just 15 feet off the ground. I'll be QRV for a few hours and would like to make a few contacts. I'll be on the sked page. Thanks, Tony -K2MO
Re: [digitalradio] Re: QRV RFSM-8000 tonight
http://www.arwatch.com/info/t_part97.htm It's all spelled out in PART97 in 95.305 and 95.307. On 6 meters, you can go up to 19.2 kb. On 10 meters, you can go up to 1200 baud. Below that, 300 baud is the limit. Note that several HF digital modes try to evade the 300 baud limit on the low bands by transmitting several signals ( under 300 baud each ) at the same time from a single transmitter to get a higher effective baud rate. The legality of this practice, which clearly violates the spirit if not the letter of PAT97 has yet to be established. 73 DE Chales Brabham, N5PVL Prefer to use radio for your amateur radio communications? - Stop by at HamRadioNet.Org ! http://www.hamradionet.org -- Original Message - From: Bill V WA7NWP To: digitalradio@yahoogroups.com Sent: Monday, October 12, 2009 6:25 PM Subject: Re: [digitalradio] Re: QRV RFSM-8000 tonight So what would be the lowest band we could use it on? 10 meters? 6 meters? Higher? Bill, WA7NWP On Mon, Oct 12, 2009 at 4:19 PM, obrienaj aobri...@stny.rr.com wrote: Thanks Patrick, I guess we will have to lobby for some changes. Andy --- In digitalradio@yahoogroups.com, Patrick Lindecker f6...@... wrote: Hello Andy, If RFSM-8000 derives from MIL-STD-188-110A (implemented in Multipsk), it is not legal in USA because the speed modulation is equal to 2400 bauds with a limit of 300 bauds in USA (you can't TX in 110A in USA). It is really a shame. Note: even if the (useful) bit speed is equal to 75 bps, the modulation remains at 2400 bauds.
Re: [digitalradio] Re: QRV RFSM-8000 tonight
I use 188-110 at work and it is still not a barn burner for data rates although it is fairly dependable. Most days lately with no sunspots it has been 600-1200 bits per second and this is using a considerable amount of wattage on both ends. So please do not get your hopes up too much. It is dependable but still slow. Rick - KH2DF Sent from my iPhone On Oct 12, 2009, at 6:19 PM, obrienaj aobri...@stny.rr.com wrote: Thanks Patrick, I guess we will have to lobby for some changes. Andy --- In digitalradio@yahoogroups.com, Patrick Lindecker f6...@... wrote: Hello Andy, If RFSM-8000 derives from MIL-STD-188-110A (implemented in Multipsk), it is not legal in USA because the speed modulation is equal to 2400 bauds with a limit of 300 bauds in USA (you can't TX in 110A in USA). It is really a shame. Note: even if the (useful) bit speed is equal to 75 bps, the modulation remains at 2400 bauds. 73 Patrick
[digitalradio] Re: QRV digital -- cloud warmer on 80 meters
You are being heard [23:59:46][FRQ 03596000][TO ][WB4AKK ][TIS][K2MO ][AL0] BER 25 SN 04 [23:22:12][FRQ 07102000][TO ][KJ4AYT ][TIS][KM0][AL0] BER 21 SN 07 --- In digitalradio@yahoogroups.com, Tony d...@... wrote: All, Couldn't wait to get my 80 meter end-fed up today so we installed it temporally as a cloud-warmer just 15 feet off the ground. I'll be QRV for a few hours and would like to make a few contacts. I'll be on the sked page. Thanks, Tony -K2MO
