Search found 2814 matches

by rtlsdrblog
Thu Dec 31, 2020 1:06 am
Forum: RTL-SDR Discussion
Topic: Police radio changing frequency often
Replies: 4
Views: 711

Re: Police radio changing frequency often

Sounds like standard P25 trunking. Look up how to decode trunking channels with Unitrunker or SDRTrunk. Generally you'll need two dongles, one to receive the trunking control channel, and the other to receive the voice channel, but it can be done with one.
by rtlsdrblog
Mon Dec 28, 2020 5:25 am
Forum: Off-Topic
Topic: Cost of Kerberossdr
Replies: 1
Views: 263

Re: Cost of Kerberossdr

Ah sorry it's gone up to $299 recently. Reason is almost no remaining stock.

Please keep an eye out early next year as a new production is coming hopefully in Q1.
by rtlsdrblog
Wed Dec 23, 2020 10:18 am
Forum: RTL-SDR Discussion
Topic: I branch use in direct sampling?
Replies: 3
Views: 567

Re: I branch use in direct sampling?

There are two test pads next to C33 and L5 (to the left of the LDO) which connect to the I-branch. But you will indeed need to disconnect the tuner by removing the two resistors next to the pads R13 and R12.
by rtlsdrblog
Wed Dec 23, 2020 10:15 am
Forum: RTL-SDR Discussion
Topic: BT on
Replies: 1
Views: 262

Re: BT on

No it does not, but if you did want it to remain on you can use our custom driver branch and set a flag in the EEPROM. Information on the V3 users guide at www.rtl-sdr.com/V3
by rtlsdrblog
Thu Dec 17, 2020 1:53 am
Forum: KerberosSDR
Topic: Should the Kerberos power the Pi4 ?
Replies: 3
Views: 769

Re: Should the Kerberos power the Pi4 ?

I’m looking at this closer and here’s what I find. I have a Pi4 with a wall plug that says output 5.1v 3.5a. I also have a plug for additional power to the KerberosSDr 5v 2.1amp. With the external power applied to the KerberosSDr and the KerberosSDr plugged into the Pi4 I can observe that the Pi4 w...
by rtlsdrblog
Thu Dec 17, 2020 1:45 am
Forum: Troubleshooting Help
Topic: Assembly of Metal Case Upgrade for SDRplay RSP1A
Replies: 1
Views: 316

Re: Assembly of Metal Case Upgrade for SDRplay RSP1A

Thermal pad goes on the bottom, no point putting it on the top, it wouldn't touch the case.
by rtlsdrblog
Thu Dec 17, 2020 1:43 am
Forum: RTL-SDR Discussion
Topic: I branch use in direct sampling?
Replies: 3
Views: 567

Re: I branch use in direct sampling?

The I-branch is connected to the R820T2 tuner, so it can't be used for HF direct sampling.
by rtlsdrblog
Thu Dec 10, 2020 10:56 am
Forum: KerberosSDR
Topic: Anyone had success with Cellphone frequencies?
Replies: 1
Views: 375

Re: Anyone had success with Cellphone frequencies?

In most places they use time division, which means that the uplink and downlink are on the same freq. They just each transmit at defined times very rapidly. SO you'd need some way to filter out the times when it's the downlinks turn which is not easy. But if the frequency division scheme is used in ...
by rtlsdrblog
Thu Dec 10, 2020 10:44 am
Forum: KerberosSDR
Topic: Running KSDR with SSH
Replies: 4
Views: 709

Re: Running KSDR with SSH

I am using the pre built Pi image, and the software runs on start up, but still needs manual calibration. I've had success syncing with the antennas still connected to the receiver (provided no signals are broadcast while syncing), but I still need to Teamviewer into the Pi to set centre frequency,...
by rtlsdrblog
Thu Dec 10, 2020 10:41 am
Forum: KerberosSDR
Topic: Antennea switches for calibration
Replies: 1
Views: 277

Re: Antennea switches for calibration

It's a bit of a hack, but you can access the GPIO voltage which controls the noise source as per this image.