Search found 46 matches
- Wed Sep 04, 2013 6:36 am
- Forum: Astro DStar and other digital voice formats
- Topic: I scored a few of these but have no idea...
- Replies: 8
- Views: 28975
Re: I scored a few of these but have no idea...
[quote="motorola_otaku"Yaesu had one of their "C$FM FDMA" radios on display at HamCom. There was no accompanying documentation, ad slicks, or anything in the way of support. Wish I'd had a waveform analyzer handy because it definitely is not speaking P25 or TRBO.[/quote] Probably...
- Sun Aug 12, 2012 1:19 am
- Forum: HAMFESTS!!!
- Topic: Joplin - August 24-25, 2012
- Replies: 7
- Views: 21864
Re: Joplin - August 24-25, 2012
I may have to give it a miss. The Cosmosphere is having it's 50th that weekend - a one-in-a-lifetime event vs. a yearly event. Hmmm. Let me think.
- Sat Aug 11, 2012 11:45 am
- Forum: HAMFESTS!!!
- Topic: Joplin - August 24-25, 2012
- Replies: 7
- Views: 21864
Re: Joplin - August 24-25, 2012
Well, were I coming down from Des Moines, I'd at least plan on a little time in KC, and plan on doing some of the more interesting attractions around Joplin, and make a weekend of it - head over to Springfield to Bass Pro, eat at Lamberts, maybe take a couple of drives around the Branson area. If I ...
- Fri Aug 10, 2012 2:47 pm
- Forum: HAMFESTS!!!
- Topic: Joplin - August 24-25, 2012
- Replies: 7
- Views: 21864
Re: Joplin - August 24-25, 2012
I'm tempted to go, as an excuse to get over to that area (since I stopped doing Route 66 on the Air I've lost that excuse).
But I'd round it out by doing some other Route 66 attractions (4 women on the route, the inn in Baxter Springs, then a run through Tulsa and OKC before heading home).
But I'd round it out by doing some other Route 66 attractions (4 women on the route, the inn in Baxter Springs, then a run through Tulsa and OKC before heading home).
- Tue Feb 28, 2012 10:49 am
- Forum: Astro DStar and other digital voice formats
- Topic: P25 Phase 2
- Replies: 9
- Views: 27154
Re: P25 Phase 2
I.. what. How does that even work without incurring delays in channel grants? Also I'm looking at your own company's application note on P25 control channels and don't see this mentioned. Time for an update maybe? The worst case delay on a channel grant using only one slot of a channel as the contr...
- Mon Feb 27, 2012 3:49 pm
- Forum: Astro DStar and other digital voice formats
- Topic: P25 Phase 2
- Replies: 9
- Views: 27154
Re: P25 Phase 2
Right now the only Phase 2 solution on the table is Motorola's X2 TDMA system. It's essentially the same thing as Astro25 but with 2:1 TDMA capability. The control channel is Phase 1 and the vocoder is still IMBE. Wrong. The control channel *can be* Phase 1 style, OR can be a TDMA channel, either o...
- Sat Apr 23, 2011 9:46 pm
- Forum: VoIP/IRLP/EchoLink etc
- Topic: Low latency IP Audio streaming for remote base?
- Replies: 14
- Views: 37134
Re: Low latency IP Audio streaming for remote base?
Sorry, HRD has one failing from my perspective - it requires an invasive, stability robbing virus to be installed on your computer.slimbob wrote:Crossband repeat and ham radio deluxe =D
- Sun Oct 24, 2010 9:17 pm
- Forum: EQUIPMENT REVIEWS
- Topic: Flex 1500
- Replies: 6
- Views: 25750
Re: Flex 1500
I've been waiting for Flex to get the software running under Linux. I'd talked to the president when he was in town for the Central States Microwave society meeting (I'd persuaded work that it would be worth having a table there - and since we both do SDR, we talked shop), and they were supposedly w...
- Fri Apr 30, 2010 8:13 am
- Forum: VoIP/IRLP/EchoLink etc
- Topic: Low latency IP Audio streaming for remote base?
- Replies: 14
- Views: 37134
Re: Low latency IP Audio streaming for remote base?
Again, a bit heavy - I'd looked at Asterisk, but that's a lot to set up for one day.motorola_otaku wrote:There's also Allstar (http://www.allstarlink.org) but I don't think you're going to like the latency with them either.
- Fri Apr 30, 2010 8:01 am
- Forum: VoIP/IRLP/EchoLink etc
- Topic: Low latency IP Audio streaming for remote base?
- Replies: 14
- Views: 37134
Re: Low latency IP Audio streaming for remote base?
I'm not sure Skype gives me anything Ekiga doesn't - both need a central server to set up the call, and at least with Ekiga I can think about running my own SIP server that I control access to.
- Thu Apr 29, 2010 5:46 pm
- Forum: VoIP/IRLP/EchoLink etc
- Topic: Low latency IP Audio streaming for remote base?
- Replies: 14
- Views: 37134
Re: Low latency IP Audio streaming for remote base?
Not that I am aware of: likely, the radios will be my IC7000, and a SDR5000 borrowed from work - Which one I use for receive and which one I use for transmit is still open for debate, but I am leaning toward the SDR doing RX at home and my 7000 doing TX.
- Thu Apr 29, 2010 9:46 am
- Forum: VoIP/IRLP/EchoLink etc
- Topic: Low latency IP Audio streaming for remote base?
- Replies: 14
- Views: 37134
Re: Low latency IP Audio streaming for remote base?
Well, I've been doing a bit of experimentation, so I'll share: Experiment #1: icecast2 + ices2 (http audio streaming) Verdict: Unsatisfactory - buffering adds a minimum of 2 seconds latency. If the system is configured to use a low bitrate then it is even worse, as many clients insist upon buffering...
- Wed Apr 28, 2010 11:12 am
- Forum: VoIP/IRLP/EchoLink etc
- Topic: Low latency IP Audio streaming for remote base?
- Replies: 14
- Views: 37134
Re: Low latency IP Audio streaming for remote base?
I saw an ad for these guys in CQ yesterday but don't know a thing about them: http://www.glentekcorp.com/ Their solution to IP latency is to use a POTS line for audio back to the operator with the IP side handling radio control. I don't guess the remote base site will be close enough to use point-p...
- Wed Apr 28, 2010 8:12 am
- Forum: VoIP/IRLP/EchoLink etc
- Topic: Low latency IP Audio streaming for remote base?
- Replies: 14
- Views: 37134
Low latency IP Audio streaming for remote base?
I'm helping my club out on setting up Kids Day on the Air this June 19th. Unfortunately, the site we pretty much have to work from has a S7 noise floor, with interfering signals as high as -60dBm! - not exactly conducive to HF contacts. The plan is to operate a remote base for receive, somewhere wit...
- Thu Oct 15, 2009 7:21 am
- Forum: Astro DStar and other digital voice formats
- Topic: amplification and p25
- Replies: 6
- Views: 20692
Re: amplification and p25
C4FM is FM - a class C amp won't do anything to it, because the signal is constant amplitude. Now, if you were to be using the CQPSK modulation scheme and you used a class C amp, you'd basically end up turning the signal into C4FM - you'd widen the spectrum back out to 12.5kHz rather than 6.25kHz. T...
- Fri Aug 21, 2009 7:23 am
- Forum: Astro DStar and other digital voice formats
- Topic: P25 repeaters
- Replies: 75
- Views: 247177
Re: P25 repeaters
OK cool, that puts my mind at rest. I expected as much re the wide pulse/LSM/other proprietary stuff Yes - ADP algorithm isn't part of the P25 spec, so I would automatically consider that to be proprietary. Here's where it gets tricky though. the Keyfill interface/protocol *is* part of the publicly...
- Thu Aug 20, 2009 8:55 pm
- Forum: Astro DStar and other digital voice formats
- Topic: P25 repeaters
- Replies: 75
- Views: 247177
Re: P25 repeaters
Point number 2 is the one that intrigues me - OP25 has been implemented from the TIA/ETSI specs and publicly available information such as the Daniels P25 training manual - nothing more.. Apart from the DVSI stuff, is there anything else that's encumbered by NDA/patents? Oh, things like how Motorol...
- Thu Aug 20, 2009 1:55 pm
- Forum: Astro DStar and other digital voice formats
- Topic: P25 repeaters
- Replies: 75
- Views: 247177
Re: P25 repeaters
Like any software project, (especially one like OP25) this project has people with all sorts of eclectic skills. Join the mailing list and you'll see exactly how/what I contribute. Surely your employer won't discipline you for reading up on our efforts. It's not a question of that - it's the questi...
- Thu Aug 20, 2009 9:39 am
- Forum: Astro DStar and other digital voice formats
- Topic: P25 repeaters
- Replies: 75
- Views: 247177
Re: P25 repeaters
Very impressive. Are you a contributor to the code, or "just a user" (not that being "just a user" is a bad thing, as good user feedback is VERY important)? I am interested in this project, but due to my position I get nervous when thinking about looking at or contributing, due t...
- Sat Jul 11, 2009 7:14 am
- Forum: Astro DStar and other digital voice formats
- Topic: P25 repeaters
- Replies: 75
- Views: 247177
Re: P25 repeaters
OP25 will get there. Once the receive code is complete, then work will start on tx code. Cheers, Matt How are you handling the vocoding? Are you using the DVSI USB dongle, or just spacing that bit off for now? Also, are you deriving any of the parametrics on the signal, such as Mod Fidelity error o...
- Thu Apr 09, 2009 7:05 am
- Forum: Astro DStar and other digital voice formats
- Topic: Please Edumacate me...
- Replies: 60
- Views: 151899
Re: D-Star is a disappoitment
Sorry, but I need to vent: D-Star is only a 4800 bis per second total data stream equivalent signal. 2400 bis per second are reserved for actual digital voice, 1200 bis per second are reserved for FEC (forward error correction) on the igital voice. (This is for callsign and short message data.) Ano...
- Tue Nov 04, 2008 12:10 pm
- Forum: Astro DStar and other digital voice formats
- Topic: NXDN?
- Replies: 14
- Views: 33693
Re: NXDN?
And yet more "DVSI has everyone by the balls" proprietary vocoder shit. :ve4uo: Well, they are like the only group actually making vocoders. Wrong. There are plenty of other vocoders out there. The problem is one of inertia: since developers of communications protocols are already using D...
- Sun Nov 02, 2008 8:39 am
- Forum: Astro DStar and other digital voice formats
- Topic: P25 repeaters
- Replies: 75
- Views: 247177
Re: P25 repeaters
Even the engineers working down the hall from me have a fuckload of trouble getting CML samples. Buy a USRP with the appropriate transmitter and reciever modules, and... http://www.sedition.org.au/op25/ :baby: Iiiiiiiiinterestink. However, I think they are going to have real problems with the IMBE ...
- Wed Jul 16, 2008 5:13 pm
- Forum: HAMFESTS!!!
- Topic: Central States VHF Society Annual Conference
- Replies: 0
- Views: 32885
Central States VHF Society Annual Conference
The Central States VHF Society Annual Conference is next week (24th July 2008 - 26th July 2008) at the Airport Hilton in Wichita. Any other hamsexuals going to be there? I brought it to our (Aeroflex Wichita) Marketing/Communications guys, and we are going to have a table there, and I got drafted as...
- Sat Jul 05, 2008 11:19 am
- Forum: Astro DStar and other digital voice formats
- Topic: P25 repeaters
- Replies: 75
- Views: 247177
Re: P25 repeaters
Get er done! :baby: That's kind of what I was trying to do with the hardware here. Where would a person get the specs for the protocol, enough to do something like that? Either from the TIA, or I think there's enough information on the Internet that, if you have enough background in signal processi...
- Fri Jul 04, 2008 8:55 am
- Forum: Astro DStar and other digital voice formats
- Topic: P25 repeaters
- Replies: 75
- Views: 247177
Re: P25 repeaters
I'm rather surprised somebody hasn't done the simpler idea of just using a low-cost low-power DSP to: 1) take the flat RX audio (discriminator audio) and recover the CAI symbol stream. 2) take that symbol stream and regenerate the idealized waveform out to the flat TX input. The DSP wouldn't have to...
- Sun Jun 15, 2008 8:48 am
- Forum: HAMFESTS!!!
- Topic: HamCom 2008 - Plano, TX
- Replies: 44
- Views: 90867
Re: HamCom 2008 - Plano, TX
I might have liked to go, but unfortunately I was ministering to an ailing repeater. That was a weird one: the machine had gone deaf. I got to the site, plugged the RX into my service monitor, and did a quick check: -120dBm for 12dB SINAD. OK, so maybe the antenna is bad. It's a bit of a trick to ch...
- Tue Jun 03, 2008 11:15 am
- Forum: HAMFESTS!!!
- Topic: HamCom 2008 - Plano, TX
- Replies: 44
- Views: 90867
Re: HamCom 2008 - Plano, TX
I'd have said "Get your towel (you DO know where your towel is, don't you?), place it between the antenna and the car, and strap it on the side of the car, running from hood to trunk, tied through the passenger side windows and at the hood and trunk. Bonus points for using it as a lance <sfx fr...
- Thu Dec 13, 2007 11:00 am
- Forum: Astro DStar and other digital voice formats
- Topic: Astro modulation type
- Replies: 3
- Views: 10056
Re: Astro modulation type
C4FM CQPSK WIDE What's the difference? Which should I use? Short answer: whatever the system you are on uses. Longer answer: C4FM is the APCO-25 standard specified modulation. It occupies a 12.5 kHz channel, and has no AM component (it is pure FM), and so does not require a linear amplifier. CQPSK ...
- Mon Sep 24, 2007 1:59 pm
- Forum: VoIP/IRLP/EchoLink etc
- Topic: IRLP - The Fedora Legacy Project is shutting down, by WY0X
- Replies: 8
- Views: 24807
Re: IRLP - The Fedora Legacy Project is shutting down, by WY
FYI folks, The Fedora Legacy Project is shutting down. This will mean that all Fedora nodes won't have security updates via yum, probably effective relatively immediately. I think you may be confusing two different things. The Fedora Legacy project was the project for Fedora before Redhat became in...
- Tue Sep 18, 2007 4:10 pm
- Forum: HAMFESTS!!!
- Topic: Route 66 on the Air, Sept 8th 2007 to 16th Sept 2007
- Replies: 3
- Views: 7918
1057 contacts
Well, we made about 1057 contacts, on 20, 40, and 80 - furthest contact was Moscow Russia. Not bad, considering that all but Wednesday we were a single radio station - Wednesday some guys from Chanute Kansas showed up with their radio, so I let them have the G5RV and I worked with my Mini Tarheel on...
- Fri Sep 07, 2007 5:32 pm
- Forum: HAMFESTS!!!
- Topic: Route 66 on the Air, Sept 8th 2007 to 16th Sept 2007
- Replies: 3
- Views: 7918
Bump
Just a bump before I go
To whom it may concern
conversing at the speed of light
it's easy to get burned.
Whether or not I'll have any ability to get online during the next week is still an open question, but in case I don't, look for W6M on the air.
To whom it may concern
conversing at the speed of light
it's easy to get burned.
Whether or not I'll have any ability to get online during the next week is still an open question, but in case I don't, look for W6M on the air.
- Fri Sep 07, 2007 7:25 am
- Forum: Astro DStar and other digital voice formats
- Topic: Hetrodynes... does it happen with...
- Replies: 17
- Views: 41270
Back on topic. Does transmit deviation matter for P25? I just thought, if I'm using 2.5kHz deviation and my mate is using 5kHz, does it matter? (apart from bandwidth use??) P25 is not like analog FM - there is a specified deviation for the symbols, and if you aren't at that deviation you aren't mak...
- Tue Sep 04, 2007 5:50 pm
- Forum: Astro DStar and other digital voice formats
- Topic: Hetrodynes... does it happen with...
- Replies: 17
- Views: 41270
- Tue Sep 04, 2007 2:56 pm
- Forum: Astro DStar and other digital voice formats
- Topic: Hetrodynes... does it happen with...
- Replies: 17
- Views: 41270
Re: Hetrodynes... does it happen with...
First of all: VOCODERS ARE NOT PROTOCOLS! You are using some protocol which uses IMBE as a protocol (e.g. you are using APCO-25 CAI). Saying you are using "IMBE" is like saying you are using "big". If anything - analog or digital - interferes with a digital protocol, then the res...