Wireless Data Logging

[Matt]

Hello,

I am prototyping a project that transmits information taken by a data
logger wirelessly up to a distance of 10km. I'm trying to find
transmitters/receivers that are:

- low cost
- narrow-bandwidth
- long distance (low frequency)
- few external components (a package basically)

The Radiometrix BiM1 looks to be a good transceiver, boasting up to
10km range. Are these commercially available in the United States?

I'm also curious as to any suggestions about how to maximize the
distance between transmitter and receiver. I'm planning on a yaggi on
one end (fixed) with a quarter-wave whip using quarter-wave radial
ground elements on the mobile end.

Thanks in advance for any advice/products suggestions!

-Matt

 

[Deefoo]

Hello,

I am prototyping a project that transmits information taken by a data
logger wirelessly up to a distance of 10km. I'm trying to find
transmitters/receivers that are:

- low cost
- narrow-bandwidth
- long distance (low frequency)
- few external components (a package basically)

The Radiometrix BiM1 looks to be a good transceiver, boasting up to
10km range. Are these commercially available in the United States?

I'm also curious as to any suggestions about how to maximize the
distance between transmitter and receiver. I'm planning on a yaggi on
one end (fixed) with a quarter-wave whip using quarter-wave radial
ground elements on the mobile end.

Thanks in advance for any advice/products suggestions!

-Matt

If the data can be send in bursts every once in a while you could use a
mobile phone. Boosted WiFi ?.

-- John

 

[Matt]

Hi John,

The deployment point would be on Midway Island and the Great Barrier
Reef. Not much cell coverage in those places. I like your idea of
sending in bursts, this can allow me to keep the usable bandwidth down
in order to send across larger distances.

-Matt

 

[Rene Tschaggelar]

Hello,

I am prototyping a project that transmits information taken by a data
logger wirelessly up to a distance of 10km. I'm trying to find
transmitters/receivers that are:

- low cost
- narrow-bandwidth
- long distance (low frequency)
- few external components (a package basically)

The Radiometrix BiM1 looks to be a good transceiver, boasting up to
10km range. Are these commercially available in the United States?

I'm also curious as to any suggestions about how to maximize the
distance between transmitter and receiver. I'm planning on a yaggi on
one end (fixed) with a quarter-wave whip using quarter-wave radial
ground elements on the mobile end.

Thanks in advance for any advice/products suggestions!

I once came across the ADF7011 from Analog Devices.
A 433 & 868MHz band transmitter with a datarate of
up to 76kbits. For 3.67$ at single quantities at
digikey. A booster amplifier and a Yagi should do.

Rene

 

[Matt]

Hi John,

The deployment point would be on Midway Island and the Great Barrier
Reef. Not much cell coverage in those places. I like your idea of
sending in bursts, this can allow me to keep the usable bandwidth down
in order to send across larger distances.

-Matt

 

[Rene Tschaggelar]

Hello,

I am prototyping a project that transmits information taken by a data
logger wirelessly up to a distance of 10km. I'm trying to find
transmitters/receivers that are:

- low cost
- narrow-bandwidth
- long distance (low frequency)
- few external components (a package basically)

The Radiometrix BiM1 looks to be a good transceiver, boasting up to
10km range. Are these commercially available in the United States?

I'm also curious as to any suggestions about how to maximize the
distance between transmitter and receiver. I'm planning on a yaggi on
one end (fixed) with a quarter-wave whip using quarter-wave radial
ground elements on the mobile end.

Thanks in advance for any advice/products suggestions!

I once came across the ADF7011 from Analog Devices.
A 433 & 868MHz band transmitter with a datarate of
up to 76kbits. For 3.67$ at single quantities at
digikey. A booster amplifier and a Yagi should do.

Rene

 

[Rich Grise]

Hi John,

The deployment point would be on Midway Island and the Great Barrier
Reef. ...

Um, isn't that a little more than 10KM?

;-P
Rich

 

[Tom]

Max Stream advertises a 11 km range with their 1 W modules using a
dipole antenna:

http://www.maxstream.net/products/xstream/devkit/9xstream.php

Tom

 

[Matt]

I checked out the data sheet (not as technical as I'd like to see) but
really approve of this module. The cost is higher than the Radiometrix
BiM1, however the distance is increased as well as the output power.
I'm going to seriously consider this module, thanks Tom!

 

[[email protected]]

You're welcome.

One fact of life in RF that is hard to avoid: power = $$$!

Tom