Search found 35 matches

by Stromeko
Wed Sep 09, 2020 8:02 am
Forum: KerberosSDR
Topic: KerberosSDR Developments in 2020
Replies: 30
Views: 21163

Re: KerberosSDR Developments in 2020

Can the Kerberos 4 channel board accept a clock input signal? At least the first batch has a clock input next to channel 4, you also need to jumper the board to act as a secondary (otherwise this acts as a clock output). This functionality was/is meant for daisy-chaining two KSDR for an 8-channel s...
by Stromeko
Fri Aug 28, 2020 11:07 am
Forum: KerberosSDR
Topic: Please help with start-up issues with KerberosSDR
Replies: 7
Views: 807

Re: Please help with start-up issues with KerberosSDR

Thanks for the research you've done. I'll have to get a 8GB model and test it. Bit of a shame if image files aren't compatible between the different RAM sizes though. AFAIK, the way the memory used to get mapped between VPU and ARM side can not work past 4GB total memory size (mapping 16MiB pages o...
by Stromeko
Sat Jul 25, 2020 7:47 am
Forum: RTL-SDR Discussion
Topic: RTL-SDR for Iridium
Replies: 6
Views: 1126

Re: RTL-SDR for Iridium

I am not using the recommended 30x30cm copper mounting plate since my intuition is that it would improve performance but not be necessary. Would it be necessary? Intuition and RF don't mix well unless you are one of very few gifted individuals. If an antenna is designed to work with a ground plane ...
by Stromeko
Fri Jul 17, 2020 4:34 am
Forum: KerberosSDR
Topic: KerberosSDR Interface to Gnu Radio Companion (GRC)
Replies: 14
Views: 4841

Re: KerberosSDR Interface to Gnu Radio Companion (GRC)

BUT phase coherency/sync is still not achieved by that stage. The reason is that when the R820T2's start up their initial phase is completely random. Hmm. From what I've read it's the mixer PLL that arrives at a slightly different tuning each time, so you end up with a drifting phase difference bef...
by Stromeko
Mon Jul 13, 2020 4:30 pm
Forum: KerberosSDR
Topic: KerberosSDR Interface to Gnu Radio Companion (GRC)
Replies: 14
Views: 4841

Re: KerberosSDR Interface to Gnu Radio Companion (GRC)

Kerberos is not coherent by itself, the sample and phase sync comes from the software. So in GNU Radio you'd have to build a flowchart to do the coherency for you - not that simple or maybe not even possible, which is why we do it in the C code. That doesn't sound right... :) My current understandi...
by Stromeko
Sat Jul 11, 2020 8:34 am
Forum: Signal Identification Help
Topic: Contineous signal at 148.5MHz - Identification help
Replies: 3
Views: 1063

Re: Contineous signal at 148.5MHz - Identification help

Well, 148.5MHz is the pixel clock frequency for FullHD...
by Stromeko
Sat Jul 11, 2020 8:26 am
Forum: KerberosSDR
Topic: Kerberos SDR stopped responding
Replies: 8
Views: 1205

Re: Kerberos SDR stopped responding

[email protected]:~ $ rtl_test Found 4 device(s): 0: RTL-SDR, KerberosSDR, SN: 002 1: RTL-SDR, KerberosSDR, SN: 003 2: RTL-SDR, KerberosSDR, SN: 004 That is pretty wierd. Note that rtl_test found four devices (so the four USB endpoints exist), but then only got data from three of those. You might try ...
by Stromeko
Thu Jul 02, 2020 2:19 pm
Forum: Other SDR Devices
Topic: SPECTRAN V6 with 245MHz IQ streaming via USB?
Replies: 3
Views: 886

Re: SPECTRAN V6 with 245MHz IQ streaming via USB?

I just found this new USB SDR from Aaronia: https://aaronia.com/downloads/#tab_4 How can they stream 245MHz IQ via USB? I dont get it. Whats the price tag? Dual USB3.2 gives you 2x2x10Gibit/s raw bandwidth to play with (assuming they use lane bonding), and streaming 2x16bitx245MHz "only" needs 7.3G...
by Stromeko
Sat Jun 27, 2020 7:05 am
Forum: RTL-SDR Discussion
Topic: ADSB Beginner Advice Please.
Replies: 2
Views: 623

Re: ADSB Beginner Advice Please.

I'm new to this subject and would really appreciate some advice! My top level use case is - I'd like to receive aircraft tracks from ADSB and get that data into a .NET C# application that I will write. I'm thinking of using (from Amazon) "NESDR Mini 2 USB RTL-SDR & ADS-B Receiver Set, RTL2832U & R8...
by Stromeko
Tue Apr 21, 2020 3:22 pm
Forum: Troubleshooting Help
Topic: cannot detect airplanes
Replies: 3
Views: 1220

Re: cannot detect airplanes

GIBABYTE U7300 wrote:
Tue Apr 21, 2020 1:11 pm
Hi i would like to detect some airplanes above me. I have GIGABYTE GT-U7300. I found on internet that it contains RTL2832U/FC0012.
That tuner chip only works from 22 - 948.6 MHz.