All Questions
18 questions
-3
votes
2
answers
172
views
What frequencies can a GNSS (Global Navigation Satellite System) antenna pick up?
Am sure that a GNSS antenna can pick up other frequencies than GNSS ones, so is there anyone who tested that theory?
user25171
3
votes
1
answer
108
views
Why some QO-100 setups use GNSS
I'm looking into building a QO-100 setup, but am struggling to find good/easy to understand resources for beginners which would outline the most common approaches and their pros/cons. From what I ...
3
votes
1
answer
152
views
Will two GPSDO units be precisely in phase with each other?
I always thought of a GPSDO as only a precise frequency reference. But the GPS and other GNSS systems also deal with rather precise UTC/TAI-ish time!
Are the outputs of any two GPSDO units generally ...
- 7,469
11
votes
4
answers
6k
views
How do GPS receivers communicate with satellites?
I have a Technical Amateur Radio license so I know the basics of wavelengths. What I'm researching is how GPS works.
From what I've read, there are frequencies such as L1, L2, and L5 uses in GPS ...
- 309
0
votes
1
answer
238
views
Is there a way to make `gnss-sdr` work with USRP B210 showing the PVT solution?
gnss-sdr seems to be working, but never show coordinates or synchronization with any satellite.
I know that GPSDO included with my USRP only works with GPS ANT ...
1
vote
1
answer
415
views
Does GPS port of USRP B210 only used for GPSDO?
I try to use gnss-sdr these days with USRP B210.
When I connect GPS antenna with RX port,gnss-sdr output well.But GPS antenna ...
- 650
0
votes
2
answers
402
views
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 ...
- 11
2
votes
3
answers
327
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?
- 123
0
votes
2
answers
169
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
votes
2
answers
335
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 ...
- 583
2
votes
2
answers
384
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.
- 121
1
vote
3
answers
752
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....
- 111
3
votes
1
answer
1k
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 ...
- 133
5
votes
1
answer
391
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. ...
- 159
3
votes
2
answers
433
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 ...
- 188
10
votes
2
answers
4k
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)?
- 327
4
votes
3
answers
3k
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 ...
- 143
4
votes
1
answer
275
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 ...
- 1,346