Архив за 13.02.2020

Troubleshooting Help • Unable to get audio on HF/Medium Wave

Using the direct sampling Q branch mode I can receive signals OK on HF/MV but get no audio. FM in Quadrature mode works OK. See attached screen print of AM mode
AM SDR .jpg

Statistics: Posted by KL Bird — Thu Feb 13, 2020 9:58 pm

RTL-SDR Discussion • adsbScope+dump1090 question

in adsbScope, there is an option to drop planes in intervals, 20 sec, 1 min, 5 min, 30 min, 1 hour, up to 10 hours. as well as having hidden it after 20 secs .is there a way to make it so that it drops a plane with dump1090 otherwise there is a plane on it and not on dump1090. see pic for what i mean.
absd decoder question.png

Statistics: Posted by weathersatelite — Thu Feb 13, 2020 9:47 pm

KerberosSDR • Re: Newbie and first thoughts

On a positive note.

I tuned into the Airband frequencies. This isn't a regular playground for me but some constant traffic was needed for testing and this fitted the bill.

The receiver was connected to a white stick on the roof of the house (@12M) and the Kerberos was plugged into 4 aerials at knee height (@0.30 M).

There was a lot of traffic heard on the receiver but every now and again there was plane that was picked up on the 4 DF aerials. These resulted in a very steady bearing on the html compass app.


Statistics: Posted by Tom_G0JSV — Thu Feb 13, 2020 9:40 pm

KerberosSDR • Re: Newbie and first thoughts

Thanks for the info re-power. Plus the explanation regarding the initial config.

I lost half a day today because I just could not get the KerberosSDR to go blue (i.e. the internal lights). The White light came on but no matter what I did the blue lights didn't shine. I tried another USB cable, and then another, and yet another. No joy. I was about to give up but then remembered that the working cable had a logo on the fat end. I had re-purposed that cable for another job. Found it, plugged it in and the blue lights came on again. Phew. The logo isn't important but that cable was obviously very different from the 3 substitutes. Assume that they were all designed for charging as opposed to data TX.

Can you recommend a good cable? Maybe include one for a small fee with any new orders?

Still having a few issues on the networking side. It is all a bit hit and miss. If the RPi is plugged in to an Ethernet connection (I know...completely different network) I have more success. The RPi can be reached using WiFi to the internal access point. [@]. But if the physical cable isn't connected the VNC software nor the Web pages will respond.

The connection to the 'hotspot' is good because using a network analyser both IP addresses are visible. Host and a single client.

But if the physical cable isn't connected, the hotspot will accept a connection but nothing else will work.


Statistics: Posted by Tom_G0JSV — Thu Feb 13, 2020 9:10 pm

Some questions I can’t really find any clear answers for

hey I'm a beginner in this hobby and it's really cool. I managed to pull images from noaa and meteor, listen to 2m ham band, receive dump1090, receive a morse code beacon from capanna Margherita and some more all with a cross dipole antenna tuned for 137mhz. It's a really bad antenna in a really bad position and I'm planning on upgrading (for starters I want to put antennas on the roof) I should also mention that i'm on a really small budget and I'm trying to buy the least possible.

here's my hardware: nesdr smartee v2 10m rg58 cable 137mhz cross dipole

Here are some questions

1) Can I use a raspberry pi (orange pi) and position it near the antenna, on the roof of my house and use sdr remotely? what are the disadvantages?

2) I want to switch antenna automatically using some relays i have (dc) I can't find some values for what the performance loss would be receiving only (the range would be mostly 30mhz to 1700mhz but specifically around 100 / 200Mhz)

3)I want to build a better cross dipole right hand polarized antenna but i can only buy 50cm (150Mhz) alluminium rods if I want to listen to 137mhz (54cm) how much gain am I gonna lose? Is it bad for receiving meteor m2?

4)Does a right hand polarized antenna influence much negatively on the reception of other non polarized signals?

5)I live in Italy and this is my to do list: - receive es'hail 2 - try to listen to pirates -( maybe try to build a diy tracker) - try to receive an hrtp transmission

what am I missing? I'm mostly interested in spacey stuff but any info is good (I've seen lots of projects on rtl-sdr. com but i'd like to hear some opinions)

thank you for reading all this really bad post, happy sdr-ing

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Antennas • Re: Antenna for 260 mHz. Satcom

https://www.google.com/search?q=trivec+avant :shock: ...

Statistics: Posted by Username — Thu Feb 13, 2020 4:17 pm

Antennas • Re: Antenna for 260 mHz. Satcom

How durable is it? I use the Trivec behind the Glass.
I don't quite understand your question. The materials and construction method are both robust, so I expect it will easily handle anything that mother nature can throw at it, except perhaps a tornado, LOL. What is Trivec behind the Glass?

73, Bruce, VE3EAR

Statistics: Posted by VE3EAR — Thu Feb 13, 2020 4:08 pm

Comment on Submit a Story/Contact by HAYSSAM KAMAL

We are a system integrator for Public Administration use.
I’m looking for to buy 2 devices : 2g, 3g and 4g lte imsi and imei capture
Any suggestion or offer ?

KerberosSDR • Re: KerberosSDR App and bearing server

yes i changed the url of course.
I even changed my phone and nothing helped.
did anyone try to connect with the Kerboros app to the RF Mapper server?

Statistics: Posted by PERILLOS — Thu Feb 13, 2020 3:36 pm

Antennas • Re: Antenna for 260 mHz. Satcom

How durable is it? I use the Trivec behind the Glass. This Summer I want mount 3 outdoor. :D

Statistics: Posted by Username — Thu Feb 13, 2020 2:45 pm

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