Just boring stuff above 868?

Talk about anything else here.
Username
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Re: Just boring stuff above 868?

Post by Username » Tue Nov 27, 2018 2:00 pm

:D The Main Problem is here is Winter and I have no way where I can put the Antenne in.
Beside of Sat I found nothing who have some interesting stuff. Sure there are Freq for Commercial TV Cams but how often are there in my Area. :lol:

dz93
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Re: Just boring stuff above 868?

Post by dz93 » Tue Dec 04, 2018 7:54 pm

There's pager data around ~930Mhz. Above 1Ghz and you're getting into the area where signals at that frequency just don't travel very far and most things end up being point to point or some type of local area deal. In the US, I believe there are plans for public safety to use ~4.9Ghz. I've seen this frequency allocated for public safety use but have never really seen anything in the wild yet.

Username
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Re: Just boring stuff above 868?

Post by Username » Wed Dec 05, 2018 10:18 am

:shock: How about Sat? The use 10 GHZ to 12Ghz for TV Transmission.
So Hight Frequency could travel long distance. :roll:

dz93
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Re: Just boring stuff above 868?

Post by dz93 » Thu Dec 06, 2018 6:35 pm

High frequency can certainly travel very far on a point to point basis. As for Satellites; yes you can absolutely view those. However, you typically need to attenuate as much noise as possible and try to amplify the satellite signal without amplifying the noise floor too much. Most satellite signals are so weak by the time they get to the ground that they're buried beneath the noise floor. A good example is with my GOES16 set up. GOES operates above 1Ghz but you need a bandpass filter centered on GOES16 frequency and an LNA with a very good SNR. You'd be surprised by how many signals you could find buried beneath the noise floor if you look hard enough. TV transmission is essentially the same as my GOES setup. They use filters and amplifiers to pull the TV signal out from under the noise floor to prevent terrestrial signals from interfering.

So yes, you can do some satellite exploration but you'll need to make sure you use a properly sized dish for the signal you're interested in, make sure the dish is aimed directly at the satellite, and filter/amplify as necessary. Satellite stuff can get pretty expensive pretty fast. For beginners, try looking to receive NOAA satellites that operate on a VHF signal.

snn47
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Re: Just boring stuff above 868?

Post by snn47 » Sat Dec 08, 2018 7:52 am

It depends on what you find interesting, but RADAR and military are just a minute part of systems and equipment in use.
Consult the ITU RR and you will find out, how many services there are abaove 868 MHz, terrestrial on land, sea airborne and in space. However your antenna needs to be outdoor, high enough and within RLOS to receive them, and if your receiver is sensitive enough.

Username
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Re: Just boring stuff above 868?

Post by Username » Sat Dec 08, 2018 9:13 am

The only think is I receive is the Cellphone Signal and on 868 Headphone Transmissions.
Sure with an Dish TV.

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Evap1
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Re: Just boring stuff above 868?

Post by Evap1 » Sat Dec 08, 2018 12:17 pm

NarrowBand Signals on 25 East earlier today.
NarrowBand Signals 25 East3.png
NarrowBand Signals 25 East3.png (817.38 KiB) Viewed 255 times

Username
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Re: Just boring stuff above 868?

Post by Username » Sat Dec 08, 2018 4:33 pm

Indoor Antenna?
I guess I cant get it. When I look directly south the next "commercial" Sat is Astra 19,2 who our TV Channels running over.

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Evap1
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Re: Just boring stuff above 868?

Post by Evap1 » Mon Dec 10, 2018 11:18 pm

Hi Username,
Check the UHF-SatCom site for Satellite details.

Another Picture for you using an RTL V3 Dongle +RTL LNA Preamp +4 Turn RHCP
Helix Antenna just inside a groundfloor window pointing straight up in the air.
The Two GPS Channels.

You have to be very careful on the positioning as a couple of Centimetres movement
will put it out of phase, & you will lose signal.
Dongle is about 10 KHz off
GPS Channel1aa.png
GPS Channel1aa.png (608.59 KiB) Viewed 91 times
which is very good for this frequency.
Have Fun,
Evap1

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