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GNSS Radio communications Jammed?

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therock003
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I just went to a location, not far from where my base station is set (~4KM) and the Rover received no radio communication. Re-Visited on another day, and same thing happened. Ended up doing the job the traditional way with a total station, measuring distances and angles and it was such a pain.

Asked a local colleague and told me he could not connect to his base as well when he had a site near that location.

Is there any way i can tell if there really is some jamming device near that area or some kind of radio tower or any other disrupting mechanism not allowing for a base/rover setup there, and suggest possible solutions around this issue

?ÿ

P.S. Sat View was perfect. I could get 18 sats even from the ground level (did not need to get to the roof of the buildings) so i did some statics, with pretty nice accuracy to get grid coordinates for my project, but still missed out on the whole RTK experience this time around


 
Posted : December 26, 2017 2:29 am
leegreen
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What type of radios?

UHF or Cellular?

Is this near a radio tower or army base?

?ÿ

If you're using UHF you should have a scanner to check frequency.


 
Posted : December 26, 2017 4:08 am
therock003
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UHF. I operate on a pair of Trimble R8- with the external radio antennas. Here is a picture, where there is a large radio tower, and where you can see there has been a project a lot nearer to that location without issue in contrast to the current project

Also there are no military bases or operations around that area.

What type of scanner and how do i use that to make sure


 
Posted : December 26, 2017 5:40 am
nate-the-surveyor
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I bought a uniden, digital scanner. Set up the freq. To what channels i use. It worked... But not very well. I could listen to my own base. Chsh--chsh---chsh. But, bleed over signals will block your data stream.

Now, I have a Javad. It has a spectrum analyzer built in. It it light years ahead of the uniden.

Go to survey site, analyze, choose a channel, and, bam! Were good.

If another signal starts, and interferes, I can look at it, any time.?ÿ

One thing I DONT like about it, is that to change channels (unless you have spread spectrum option) is that you must return to base, and shut down the base, to change channels.

But, I'm not in a high RF area, so it rarely is a factor for me.

Radios, and cows, they sometimes dont cooperate! ...?ÿ 🙂

A higher end scanner would perhaps serve better than the uniden i have. I dont remember what I paid for it.

N


 
Posted : December 26, 2017 7:23 am
MarkSilver
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I use one of these:?ÿ

?ÿ https://www.amazon.com/BaoFeng-UV-5R-Dual-Radio-Black/dp/B007H4VT7A/ref=sr_1_3?s=electronics&ie=UTF8&qid=1514309511&sr=1-3&keywords=baofeng+uv-5r

US$25 delivered

Listen on desired frequency prior to turning on my base, I push the little button on the side that opens the squelch up and listen for 30-seconds. About 1 out of 4 setups, there is something else on the frequency. Mostly other surveyors, but sometimes what I assume is a scada system for the water district or some such thing.


 
Posted : December 26, 2017 11:34 am

mark-flora
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I've only had one project where we weren't able to use our RTK and this was at a high security scientific laboratory that had some kind of?ÿ radio signal scrambling setup....at least that's what they told us. We couldn't get any frequencies to work so it seemed about right.

Now that we only have licenses for two frequencies I'm not sure what you'd do if you have something else on both of them. How many frequencies does everybody else have available to them if something like this occurs?


 
Posted : December 26, 2017 12:46 pm
therock003
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I'm a complete newb on matters concerning radio frequencies. So how does a scanner work? When you say it listens on a frequency i mean how do you accomplish that

?ÿ

BTW i have a couple of Brondi entry level walkies. Maybe they have that option which i can use them and hopefully save some money from having to buy a scanner?

https://www.amazon.co.uk/Brondi-FX-100-Walkie-Talkies-Yellow/dp/B000L97OWM

?ÿ


 
Posted : December 26, 2017 3:27 pm
therock003
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So once i set the range on the scanner, and have it listen, what am i expecting to hear in order to notice if the channels are used


 
Posted : December 28, 2017 1:05 am