Radio Modems: Difference between revisions
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[http://www.pacificcrest.com Pacific Crest] makes radio modems, principally for connecting a GPS rover with a fixed reference station to allow submeter accuracy. | [http://www.pacificcrest.com Pacific Crest] makes radio modems, principally for connecting a GPS rover with a fixed reference station to allow submeter accuracy. | ||
I have 3 RDDR-96 "Blue Bricks". I got them at a garage sale along with a [[Magnavox GPS reference station]] Also included were | I have 3 RDDR-96 "Blue Bricks". I got them at a garage sale along with a [[Magnavox GPS reference station]] Also included were some rubber ducky omni directional antennas, a Larsen base station antenna, a Larsen YAGI directional and a 35 watt linear amp. | ||
The Blue Bricks can operate in two modes, transparent and packet. In transparent mode a pair of the radios acts as a replacement for a serial cable operating at 9600 bps. In packet mode, one radio can be the source of a data stream and several can be receivers, allowing in my case one base station and two rovers. | The Blue Bricks can operate in two modes, transparent and packet. In transparent mode a pair of the radios acts as a replacement for a serial cable operating at 9600 bps. In packet mode, one radio can be the source of a data stream and several can be receivers, allowing for example in my case one base station and two rovers. | ||
So far I have powered them up individually with their rubber ducky antennas attached and confirmed they transmit by tuning my Kenwood TH-6A handheld to their frequency and listening the bleeps when I type. | So far I have powered them up individually with their rubber ducky antennas attached and confirmed they transmit by tuning my Kenwood TH-6A handheld to their frequency and listening the bleeps when I type. | ||
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The typical use for these radios is to connect | The typical use for these radios is to connect | ||
I have a couple ideas for things I want to try with this set up. | |||
=== DGPS === | |||
Send out DGPS corrections from the GPS reference station. | |||
The rover will be a Leica 9400 or a Garmin or possibly a Trimble. Probably all three but not at the same time. | The rover will be a Leica 9400 or a Garmin or possibly a Trimble. Probably all three but not at the same time. | ||
=== Garmin Fleet Management === | |||
Connect to a server running software compatible with Garmin's Fleet Management protocol. Put a radio modem in a car that has a Garmin PND in it and see what we can do. | |||
Revision as of 01:48, 25 August 2009
Pacific Crest makes radio modems, principally for connecting a GPS rover with a fixed reference station to allow submeter accuracy.
I have 3 RDDR-96 "Blue Bricks". I got them at a garage sale along with a Magnavox GPS reference station Also included were some rubber ducky omni directional antennas, a Larsen base station antenna, a Larsen YAGI directional and a 35 watt linear amp.
The Blue Bricks can operate in two modes, transparent and packet. In transparent mode a pair of the radios acts as a replacement for a serial cable operating at 9600 bps. In packet mode, one radio can be the source of a data stream and several can be receivers, allowing for example in my case one base station and two rovers.
So far I have powered them up individually with their rubber ducky antennas attached and confirmed they transmit by tuning my Kenwood TH-6A handheld to their frequency and listening the bleeps when I type.
My radios came from the factory tuned to 420 Mhz. This means that I can operate them using my amateur radio operator's technician license. It's in the 70cm band. (See http://www.arrl.org/FandES/field/regulations/bandplan.html#70cm)
The typical use for these radios is to connect
I have a couple ideas for things I want to try with this set up.
DGPS
Send out DGPS corrections from the GPS reference station.
The rover will be a Leica 9400 or a Garmin or possibly a Trimble. Probably all three but not at the same time.
Garmin Fleet Management
Connect to a server running software compatible with Garmin's Fleet Management protocol. Put a radio modem in a car that has a Garmin PND in it and see what we can do.
