900 MHz

[KA5S]

In our area there is a 900 MHz (902-928 band) repeater. There is also an Internet service provider using 900 MHz Part 15 equipment (trying) to make money. We have priority but but what happens when an HT kills service to an apartment building , even service unwisely using frequencies the law does not protect?

And some folks want to use Part 15 for control and monitoring of the electric grid. That's as wise as dispatching ambulances by CB!

There are a LOT of such uses. In another venue, a post notes:

a search on the OET's site for devices that operate on the 902-928 MHz band in the US equal...wait for it...nine thousand six hundred and fifteen different devices!

That's not the number of stations; it's the number of kinds of equipment approved to be sold.

Thoughts?

Cortland
KA5S

[N5PVL]

Is any of that stuff good for ham radio?

[KB4QAA]

Carry a big stick antenna and operate away from the building!

You can dead right and be a dead beat in the eyes of your neighbors. Be judicious in the choice of times and modes of operation.

Good luck!

[K7JEM]

900 isn't the only band this way. Several wi-fi channels are in the 2.4 and 5.8GHz amateur allocations as well. Many ISP's use these frequencies to distribute to end users, and to backhaul to remote sites.

Joe

[WB2WIK]

In our area there is a 900 MHz (902-928 band) repeater. There is also an Internet service provider using 900 MHz Part 15 equipment (trying) to make money. We have priority but but what happens when an HT kills service to an apartment building , even service unwisely using frequencies the law does not protect?

And some folks want to use Part 15 for control and monitoring of the electric grid. That's as wise as dispatching ambulances by CB!

There are a LOT of such uses. In another venue, a post notes:


That's not the number of stations; it's the number of kinds of equipment approved to be sold.

Thoughts?

Cortland
KA5S

The other services are likely all digital so unless a ham user's carrier just obliterates the hardware being used, they might happily share for years without anyone being bothered.

Or maybe not.

Part 15 stuff is unlicensed and must accept interference from anything, by definition.

[KA5S]

The other services are likely all digital so unless a ham user's carrier just obliterates the hardware being used, they might happily share for years without anyone being bothered.

Or maybe not.

Part 15 stuff is unlicensed and must accept interference from anything, by definition.

I have a 900 MHz HT I should "evaluate" some of their modems with. Not programmed for the repeater, unfortunately.

At a quarter KW+ in band I don't see them spending what it takes to buy the kind of duplexers that would take on a Part 15 radio. A project I helped with at work used COTS 900 MHz digital packages and even at that power level they had problems with desense or intermod.

Cortland
KA5S

[WB2WIK]

I have a 900 MHz HT I should "evaluate" some of their modems with. Not programmed for the repeater, unfortunately.

At a quarter KW+ in band I don't see them spending what it takes to buy the kind of duplexers that would take on a Part 15 radio. A project I helped with at work used COTS 900 MHz digital packages and even at that power level they had problems with desense or intermod.

Cortland
KA5S

Part 15 devices aren't supposed to be transmitters, they're "devices." They're running a quarter KW with Part 15 devices? Where's that legal?

[WA4OTD]

There are so many devices on 900MHz and 2.4Ghz that you cannot imagine. Your OET search showed that. Maybe some do, but I don't think anyone has priority over anyone else in these bands.

I would use the band and not worry about it. Everyone in these frequencies know the risk. Directional antennas are so much easier at these frequencies hopefully you can mitigate problems this way if necessary.

[WA4OTD]

This is a pretty summary and easy read.

http://www.qsl.net/kb9mwr/projects/900mhz/900users.html

[KA5S]

Part 15 devices aren't supposed to be transmitters, they're "devices." They're running a quarter KW with Part 15 devices? Where's that legal?

No, that's the Amateur repeater on the other 900 MHz antenna.

Cortland
KA5S