I talked to one of the guys getting it on the air and he states it has good coverage in analog mode so far, I haven't asked how they got it to run analog and D-star at the same time.
It's not that simple... I know very little about D-STAR, and how it's modulated and what the waveforms look like, how it deviates, how the receivers are tuned...
grinthock wrote:It's not that simple... I know very little about D-STAR, and how it's modulated and what the waveforms look like, how it deviates, how the receivers are tuned...
It's quite possible it won't work.
Deviation is the same for both IMBE and AMBE, so if it is set for one, it should in theory work for the other.
The voltage points are different between the two (I think, I have to go back to DVSI web site and read some more), hence one not working with the other directly.
I will always place the mission first.
I will never accept defeat.
I will never quit.
I will never leave a fallen commrade
The vocoder is largely irrelevant to whether the repeater will repeat it, unless it actually contains vocoding capability. The modulation, frame formats, FEC etc are what you need to worry about, and between P25 CAI, these are incompatible.
Sometimes you can get close enough for it to not matter, e.g. a repeater designed to repeat FED-STD-1023 will happily repeat SECURENET, because the systems are so similar, but you won't get that in this case.
mr.syntrx wrote:The vocoder is largely irrelevant to whether the repeater will repeat it, unless it actually contains vocoding capability. The modulation, frame formats, FEC etc are what you need to worry about, and between P25 CAI, these are incompatible.
Sometimes you can get close enough for it to not matter, e.g. a repeater designed to repeat FED-STD-1023 will happily repeat SECURENET, because the systems are so similar, but you won't get that in this case.
I remember reading that before, but was curious if that worked with the D-star stuff as well.
It works without any problems!
We have such a ham repeater here (RX Motorola GM900 / TX Motorola GM950). It works in analog, in P25 and D-Star.
Of course a true digital repeater would be better, but for the price of this setup it performs quite well.
Mong wrote:Ok, thanks. BTW, WTF is up with your picture on QRZ?
Well, I was playing fool on SSTV with another , and here is the result :)
That picture is quite old (done around 2002). I live in Poland now (Warsaw), my other call is SQ5AG and I've become a full-time Motosexual since that time
I have some P25 and D-Star equipment, so have a few of my friends. We decided to build a digital-capable repeater (Input: 431.300 / Output: 438.900). It allows us to do some side-by-side tests of these protocols (so far we discovered that P25 had a better error-correction system that D-Star).
Our current project is to build a D-Star VHF simplex - Analog UHF simplex patch, to allow D-Star users to discuss with those with analog equipment. A lot of fun in perspective!
We have such a ham repeater here (RX Motorola GM900 / TX Motorola GM950). It works in analog, in P25 and D-Star.
Of course a true digital repeater would be better, but for the price of this setup it performs quite well.
What do you do to keep out QRM/QRN? Just wondering. I'd like to put up an IMBE capable repeater here and this would be the only way I could pull together the funds to do it but, I don't want to put something on the air that I can't keep from keying from intermod or malicious signals.
We have such a ham repeater here (RX Motorola GM900 / TX Motorola GM950). It works in analog, in P25 and D-Star.
Of course a true digital repeater would be better, but for the price of this setup it performs quite well.
What do you do to keep out QRM/QRN? Just wondering. I'd like to put up an IMBE capable repeater here and this would be the only way I could pull together the funds to do it but, I don't want to put something on the air that I can't keep from keying from intermod or malicious signals.
You don't, unfortunately. The passthrough repeater does just that - it passes anything it hears on through.
I had an idea to jerry-rig an IMBE COR circuit out of the BCi25 cards for the older BC780/235 scanners, but no one seems to have a schematic or pinout for the connector (with good reason, most likely. )
Why do hammies feel the need to label their repeaters? Putting the callsign, input/output freqencies, and the pl on the front of the repeater is just gay. Nobody cares!
K8TEK wrote:Why do hammies feel the need to label their repeaters? Putting the callsign, input/output freqencies, and the pl on the front of the repeater is just gay. Nobody cares!
I thought that was a requirement at the larger shared sites, so if someone was having an interference issue they'd know where everyone else was TXing at, as well as who to contact if an offender was located.
K8TEK wrote:Why do hammies feel the need to label their repeaters? Putting the callsign, input/output freqencies, and the pl on the front of the repeater is just gay. Nobody cares!
k4wtf wrote:OK. So a nice clean RF environment is important here.
What is your experience with yours? Does it TX a lot on garbage or is it OK?
I haven't actually put one up. <_< We have an issue around here with broadband sweeping noise across the entire 430-450 range from what we're pretty sure is military radar, so I don't think one would fly too well (pun intended? ;p )
There's also the issue with re-clocking. A Quantar/Quantro reclocks its received signal so if there's any noise in it it's completely removed before retransmission. The passthrough repeater doesn't do that - it just repeats what it hears. So if you're marginal into it, you're still going to be marginal coming out of it.
K8TEK wrote:Why do hammies feel the need to label their repeaters? Putting the callsign, input/output freqencies, and the pl on the front of the repeater is just gay. Nobody cares!
How many hams are putting up digital/900/1200/900 with 6meter RX? Some people bitch at the people who put up yet another 2 meter machine at 100ft, yet when someone actually does something different, you still bitch.
I'm not goan know th eguy who put a 900 machine 4 miles from my job, just have to see how to reprogram the work radios for it
K8TEK wrote:Why do hammies feel the need to label their repeaters? Putting the callsign, input/output freqencies, and the pl on the front of the repeater is just gay. Nobody cares!
I thought that was a requirement at the larger shared sites, so if someone was having an interference issue they'd know where everyone else was TXing at, as well as who to contact if an offender was located.
Every site around here has that requirement. You'll see the ham repeaters labelled, as well as the police and commercial machines etc.
Dude... You could donate the second one for the Southeast Hamsexy Infiltration Team. (We're the SHIT ya know!)
I've got a place for it at 250ft+ at the top of my office building. It should cover for all of us hamsexuals down in the upstate and since 3/4's of us are now P25 sexy, we need a P25 repeater!
, and here is the result :)
