Архив за Декабрь, 2018

My first (bad) NOAA image.

My first (bad) NOAA image.

I was playing around with a SDR I got recently and decided to try receiving NOAA images, being an absolute beginner at this:

Interferences made by constantly moving the antenna connection - it would be better if I would left it still.

About the antenna:

Since I saw that V-dipole antennas are simple but effective, I made one using (please don't kill me) two useless selfie sticks that were taking dust. I know this solution isn't perfect, but as experiment I needed to maintain this at zero cost.

https://i.redd.it/x309xrekpn721.jpg

submitted by /u/Nroskden
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Off-Topic • Re: WFM in Air band spectrum?

Ah, I see. Thanks for the info! I've seen FM filters on Amazon, and I'm guessing this is what those are for. Thanks again!

Statistics: Posted by jryx — Mon Dec 31, 2018 9:40 pm


Dynamic range question

I've come across an issue where I seem to be getting very little dynamic range, sensitivity seems fine but strong signals just swamp the receiver (AM reception). Datasheet for r820t states "The chip embeds a smart power detector to optimize different input power scenarios as well as the spurious free dynamic range."

Using sdrconsole V3, the only option I see is lowering gain under radio definitions, but the receiver is still getting swamped. Using sdrsharp with "tuner AGC" selected doesn't help either!

Am I missing something? Is there any way to increase dynamic range? Or is this just a limitation of these receivers? Thanks in advance and happy holidays!

submitted by /u/Mac_O-
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RF Penetration Testing Program

I just stumbled upon this sub and wondered if you guys had any insight or experience in a RF pentesting.

Is there a specific type business or industry that would benefit from having RF pentesting? As far as I know there’s no real requirement so I would think the need would be very little but is it enough for a niche?

submitted by /u/Nucky76
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Which receiver would be best for DAB?

I'm trying to choose between a Thumbnet N3 or a cheaper Technofix TCXO version 3 USB stick.

My prime interest is DAB radio, which here in Britain transmits roughly between 175 and 240 Mhz.

Any views on which would be better for my purposes please?

submitted by /u/beermad
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Comment on Building a Carbon Fibre Dual Band Yagi Antenna for Amateur Radio Satellites with 3D Printed Parts for 20€ by GG

I thought carbon was conductive (to some degree). No?

success with NOAA 18

as the title says, I've had some success finally with capturing a good .wav of a NOAA pass. this was NOAA 18, at about 9PM CST (GMT -6)

i am in the Texas Gulf region. heres my results

(done with rabbit ears i found in my garage, set to 54.5 cm length at 120 deg and a cheap LNA i purchased off Amazon for about 10 bucks USD that i fit into an altoids tin)

as an aside, Im having to decode images with NOAA-APT only, as every time i attempt anything with WXtoIMG, i just get an unviewable mess and a notice that it couldnt find telemetry data (cant recall exact message, just the gist). i am fairly sure this has to be operator error.

anyone have any ideas what I may be doing wrong WRT WXtoIMG?

submitted by /u/leaming_irnpaired
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Wireless remote for my RTL-SDR.

Wireless remote for my RTL-SDR.



(RSS generated with FetchRss)

Comment on Tutorial on Setting up OP25 for P25 Phase 2 Digital Voice Decoding by DallasTechie

Dallas Texas has remained using analog but with DCS encoding. Most suburban cities have switched to P25 phase 2 with a lot of them using encryption. Irving, Carrollton, Addison and Farmers Branch have switched to P25 Phase 2 with Encryption for the whole city including public works, streets, animal control etc…. Sort of scary when the whole city switches to full encrypted communications. Makes you wonder what they are hiding.

Comment on Tutorial on Setting up OP25 for P25 Phase 2 Digital Voice Decoding by Techie

Dallas Texas has remained using analog but with DCS encoding. Most suburban cities have switched to P25 phase 2 with a lot of them using encryption. Irving, Carrollton, Addison and Farmers Branch have switched to P25 Phase 2 with Encryption for the whole city including public works, streets, animal control etc…. Sort of scary when the whole city switches to full encrypted communications. Makes you wonder what they are hiding.

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