Posted: 1/28/2013 9:47:48 AM EDT
| Does anyone know of a digital protocol where where voice and data can be filtered from one another? What I'm trying to accomplish is a voice and data system over UHF. The problem, due to weight considerations on the vehicle the system is going to be implemented on, one transceiver would be the best option. Basically wanting to keep voice comms with the driver while being able to have data comms to monitor the engine parameters as well as make fine adjustments while on the fly on a single radio. |
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Quoted: Does anyone know of a digital protocol where where voice and data can be filtered from one another? What I'm trying to accomplish is a voice and data system over UHF. The problem, due to weight considerations on the vehicle the system is going to be implemented on, one transceiver would be the best option. Basically wanting to keep voice comms with the driver while being able to have data comms to monitor the engine parameters as well as make fine adjustments while on the fly on a single radio. I guess you could change channels, one for voice and another for data...on the same radio. Simultaneous on the same freq may be an issue. Which digital modes do you want to run? I run Pactor3, MT63, and Olivia on a regular basis and they don't appear to be influenced by voice on the channel. Most digital modes are noisy enough that folks won't try to use voice during a digital transmission. All my digital comms run in the background on voice nets and will allow transmission of digital by pushing a button to start the TX...they RX in a passive mode. |
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what is the bitrate for the telemetry? is the telemetry bidirectional or unidirectional? is the telemetry realtime/periodic or can it be interrupted? is the audio bidirectional or unidirectional? ostensibly you can just run a digital channel and do low-bit rate encoding of the audio path; the result is everything on the RF link is digital. but we first need to understand what the requirements are on the link. otherwise you could end up with perfect audio quality and very little data throughput, etc. by the way, is the link frequency in the UHF amateur spectrum or is it in the UHF business band? occupied channel bandwidth is going to come into play here. ar-jedi |
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Check out dstar. A transmission simultaneously supports digital voice and a 1200bps data stream. Google D-rats for more info on data.
Only thing I don't know is how to inject custom data as a payload. Eta: assuming amateur bands here. Also you could go with a dual radio like a Kenwood d710. One side for analog voice and the other for up to 9600bps data via AFSK. You can even get an AFSK Modem Arduino shield! |
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Not quite sure of the bitrate. Ideally it would run on a business band but if I had to (its not actually for commercial purposes but for a student organization). The idea is to have voice to the driver of the car and then be able to monitor the engine parameters. The car weighs roughly 400 lb without the driver, 990cc turbo charged fuel-i…0-60 is about 3.9 seconds. So weight is a concern.
Wanting to modify an existing FM radio. Just looking at options. Don't need to have data sorted out until the end of the first summer semester. |
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Quoted:
Not quite sure of the bitrate. Ideally it would run on a business band but if I had to (its not actually for commercial purposes but for a student organization). The idea is to have voice to the driver of the car and then be able to monitor the engine parameters. The car weighs roughly 400 lb without the driver, 990cc turbo charged fuel-i…0-60 is about 3.9 seconds. So weight is a concern. Wanting to modify an existing FM radio. Just looking at options. Don't need to have data sorted out until the end of the first summer semester. Not an expert, but I don't think you'll be able to run data on any unlicensed band, though I'm sure others will be by shortly to inform us on the veracity of my statement. |
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Quoted:
Quoted:
Not quite sure of the bitrate. Ideally it would run on a business band but if I had to (its not actually for commercial purposes but for a student organization). The idea is to have voice to the driver of the car and then be able to monitor the engine parameters. The car weighs roughly 400 lb without the driver, 990cc turbo charged fuel-i…0-60 is about 3.9 seconds. So weight is a concern. Wanting to modify an existing FM radio. Just looking at options. Don't need to have data sorted out until the end of the first summer semester. Not an expert, but I don't think you'll be able to run data on any unlicensed band, though I'm sure others will be by shortly to inform us on the veracity of my statement. Either gonna happen under Part 90 or Part 97 licensing. All depends on whether or not the school will allow access to their Part 90 freqs. |