Search found 39 matches

by Stromeko
Sat Jun 01, 2019 4:01 pm
Forum: KerberosSDR
Topic: Power connection question
Replies: 28
Views: 17615

Re: Power connection question

Is there a documentation of the GPIO connector on the board and can the Kerberos be powered through that?
by Stromeko
Sat Jun 01, 2019 3:54 pm
Forum: KerberosSDR
Topic: Power connection question
Replies: 28
Views: 17615

Re: Power connection question

The amperage on the PSU is only a tangential indicator of how good the regulation is under higher load. The problem really is that the Pi needs a stable voltage and the resistance in the supply will create a large enough voltage drop to make it unhappy if the unloaded voltage (at the PSU end) starts...
by Stromeko
Fri May 24, 2019 6:36 pm
Forum: KerberosSDR
Topic: Power connection question
Replies: 28
Views: 17615

Re: Power connection question

USB-A doesn't (officially) allow for 3A, so most PSU only supply a maximum of 2.4A per port (I have a bunch of those). The obvious non-USB option would have been a barrel plug, but I recognize that these may be more difficult to fit onto the board unless you're going to solder them separately. Again...
by Stromeko
Wed May 22, 2019 7:35 pm
Forum: KerberosSDR
Topic: Power connection question
Replies: 28
Views: 17615

Re: Power connection question

OK, that reply confirms my suspicion. Please have them read the USB spec to come up with a spec compliant way to do a power sink with a USB-C connector. Again, you need pull-down resistors there, not pull-up. So in summary the only option of powering through this connector is to try and get a non-co...
by Stromeko
Wed May 15, 2019 6:55 pm
Forum: KerberosSDR
Topic: Power connection question
Replies: 28
Views: 17615

Re: Power connection question

It would really be helpful if you could state whether or not the pulldown resistors on VCONN are present and what values they have. Again, this has nothing at all to do with whether or not the PSU can do PD, but the fact you're using a USB-C receptable. The pulldown resistors are required to figure ...
by Stromeko
Sun May 12, 2019 8:12 am
Forum: KerberosSDR
Topic: Interfacing KSDR in C/C++
Replies: 6
Views: 6227

Re: Interfacing KSDR in C/C++

I've had a quick look, but there aren't really any comments (and still lots of occurences of Hydra). It would be highly appreciated if the general structure of the code and the layout of the FIFO / control channels was explained somewhere. From my reading of the code (mostly just the C) the most hig...
by Stromeko
Sat May 11, 2019 5:57 pm
Forum: KerberosSDR
Topic: Power connection question
Replies: 28
Views: 17615

Re: Power connection question

Whether it's used for USB2.0 legacy (so there is another hub port behind it?) or not is immaterial to the question of how power gets there and whether a standard compliant PSU recognizes the port. The high voltage PD modes can only be used after active negotiation and a PD-PSU will always be limited...
by Stromeko
Wed May 01, 2019 6:57 pm
Forum: KerberosSDR
Topic: 4x dump1090 on KerberosSDR
Replies: 6
Views: 12058

4x dump1090 on KerberosSDR

Finally received my kerberosSDR yesterday. :D I don't have the USB-C PSU yet, but running four dump1090 instances just works when connected to a USB3.1 port directly on the PC motherboard (on the frontpanel connector I get it to run, but the devices frequently drop and then reconnect when running th...
by Stromeko
Wed May 01, 2019 6:50 pm
Forum: KerberosSDR
Topic: GPIO connection
Replies: 2
Views: 2542

Re: GPIO connection

Can the pinout of the header be documented somewhere, please?