Questions tagged [gnss]

Satellite navigation systems, including GPS. Questions should be related either to amateur radio operations (e.g. APRS tracking) or the theory of positioning using radio signals; questions merely about using GPS receivers are not on-topic.

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3answers
177 views

Why do watches with GPS receivers have an “airplane mode”?

I noticed that watches with GPS signal receivers made by Seiko and Citizen have an airplane mode. If it's a GPS receiver, it shouldn't cause interference, right?
0
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2answers
39 views

Required receiver for HX-1 (144.390 MHz) & NEO-6M GPS Module?

Context I'm launching a series of weather balloons as a capstone graduation project. Right now I am in the process of building the payload. I have been going over the different components of the ...
2
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2answers
166 views
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2answers
132 views

Is it possible to transmit telemetry data (GPS) via QRP?

I have a GPS tracking device which was designed for inventory management, currently I'm using a GSM module to transmit the telemetry data (latitude and longitude only) to the base station. The problem ...
9
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2answers
3k views

Can every antenna be used both for transmit and receive?

Assuming I have an antenna for receiving GPS signals, can I use it also for transmit — to create a repeater in a tunnel (or some place with no reception)?
1
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3answers
403 views

Total cancellation in corporate feed network for patch antenna

I'm trying to build an array of patch antennas in order to receive a GPS signal. The idea is to build 4 patches and connect them with a corporate feed network. An example of corporate feed is this one....
5
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1answer
221 views

Use ham to broadcast GPS RTK correction data

I am involved in a precise positioning project that uses Real Time Kinematic (RTK) for cm-accurate positioning. We use unattended base stations that provide real-time corrections for mobile rovers. ...
3
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2answers
309 views

How to read ID-51A GPS logger data

I own the original Icom ID-51A. I have the GPS logger logging every 5 seconds to the microSD card. How do I view this saved track data on my computer? For reference, here's one of my logs (I know ...
2
votes
1answer
425 views

Generally, what happens when you power a GPS antenna or other RF amplifier with a low voltage?

I have a 5V active GPS antenna, and want to try using it on a device with a 3.3V bias provided. Obviously, operating at an over-voltage can damage or destroy the LNA. But what happens when the ...
3
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3answers
2k views

How do I connect a GPS receiver to a radio for APRS?

I volunteer with the local search and rescue group as a team medic and a radio operator. The team is new and recently decided to go with the Garmin 64st as our go-to GPS units. Those of us with ...
4
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1answer
181 views

Using a flip-phones GPS NMEA data for the GPS in an APRS station

I have heard that it is possible to connect certain flip-phones to external devices via their Micro USB port and, through the USB port, send the NMEA location Data from their internal GPS to an ...