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GMRS / position reporting

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dcs02d

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I'd like to use GMRS radios in conjunction with an arduino controller and a speakjet chip to have a small UAV automatically report position information at regular intervals.

The position information would be reported via 'voice' It is just that the voice would be a computer. I can wire the circuit to transmit only when there is no other activity on the channel.

Is this ok to do with GMRS?

Yes I know I could use packet radio but it is heavier and more expensive!

Can you even by a packet modem for FRS? I know the regulations allow some position data to be transmitted thanks to the Garmin rule.
 

gewecke

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You mention gmrs then you mention frs???? Which are you wanting to use?
You could do this using gmrs,BUT you have to include your call sign issued to you.
There are controllers which I.D. repeaters using sythesized voice so this shouldn't be a problem.
n9zas
 

dcs02d

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You mention gmrs then you mention frs???? Which are you wanting to use?
You could do this using gmrs,BUT you have to include your call sign issued to you.
There are controllers which I.D. repeaters using sythesized voice so this shouldn't be a problem.
n9zas

Well either really. I know that with FRS there is a rule which allows some data to be sent and as I understand; it is a rule implemented to allow the garmin rhino to transmit position data. It looks as though there is no modem commercially available which work on the FRS band but thought I'd ask.
 

gewecke

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Well either really. I know that with FRS there is a rule which allows some data to be sent and as I understand; it is a rule implemented to allow the garmin rhino to transmit position data. It looks as though there is no modem commercially available which work on the FRS band but thought I'd ask.

That's because data is not allowed on FRS channels,but it is allowed on MURS but that's another story.:)
n9zas
 

SkipSanders

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GMRS currently does not allow data. GMRS also requires a control operator at the transmitter, or in direct control of it via remote link, and does not permit one-way transmissions other than paging. FRS allows some data, with limitations, however, you cannot modify a radio to add this function, it must be entirely built in by the manufacturer:

(b) You must not make, or have made, any internal modification to an FRS unit. Any internal modification cancels the FCC certification and voids your authority to operate the unit in the FRS.

The FRS data rule:

(b) Non-voice communications.
(1) The FRS unit may transmit tones to make contact or to continue communications with a particular FRS unit. If the tone is audible (more than 300 Hertz), it must be transmitted continuously no longer than 15 seconds at one time. If the tone is subaudible (300 Hertz or less), it may be transmitted continuously only while you are talking.
(2) The FRS unit may transmit digital data containing location information, or requesting location information from one or more other FRS units,
or containing a brief text message to another specific FRS unit. Digital data transmissions must be initiated by a manual action or command of a user, except that an FRS unit receiving an interrogation request may automatically respond with its location. Digital data transmissions shall not exceed one second, and shall be limited to no more than one digital transmission within a thirty-second period, except that an FRS unit may automatically respond to more than one interrogation request received within a thirty-second period.
 
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gewecke

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GMRS currently does not allow data. GMRS also requires a control operator at the transmitter, or in direct control of it via remote link, and does not permit one-way transmissions other than paging. FRS allows some data, with limitations, however, you cannot modify a radio to add this function, it must be entirely built in by the manufacturer:

(b) You must not make, or have made, any internal modification to an FRS unit. Any internal modification cancels the FCC certification and voids your authority to operate the unit in the FRS.

The FRS data rule:

(b) Non-voice communications.
(1) The FRS unit may transmit tones to make contact or to continue communications with a particular FRS unit. If the tone is audible (more than 300 Hertz), it must be transmitted continuously no longer than 15 seconds at one time. If the tone is subaudible (300 Hertz or less), it may be transmitted continuously only while you are talking.
(2) The FRS unit may transmit digital data containing location information, or requesting location information from one or more other FRS units,
or containing a brief text message to another specific FRS unit. Digital data transmissions must be initiated by a manual action or command of a user, except that an FRS unit receiving an interrogation request may automatically respond with its location. Digital data transmissions shall not exceed one second, and shall be limited to no more than one digital transmission within a thirty-second period, except that an FRS unit may automatically respond to more than one interrogation request received within a thirty-second period.

Skip, he wants to transmit data in a one way analog voice format.
"The position information would be reported via 'voice' It is just that the voice would be a computer". A short intro would suffice as a voice page along with his "voice data". This would come under the paging rule,meaning the automated voice controller can pass his "voice data" along with the call sign of his gmrs station.
This has been done a few times after receiving reply to a query from fcc.gov But you're right,he has do this by direct means or by use of a link.
n9zas
 
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