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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How Duty cycle affects transmission rate in RF module?

I planning to use RF module for communication of high precision GNSS module. So I am doing detail study on RF module. In one of the datasheets of RF module (part no: RFD868ux) mentioned that 'Duty ...
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3answers
186 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?
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2answers
81 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 ...
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2answers
203 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 ...
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2answers
195 views

What equipment and software do I need to read raw civilian GPS signals on my Mac?

This is a hobby project to learn more about GPS technology.
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3answers
537 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....
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1answer
877 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 ...
5
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1answer
265 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
364 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 ...
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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)?
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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 ...
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1answer
201 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 ...