How to distinguish between different signals and focus for DF on just one?

[merafound]

Hello,
I would like to search for a signal on the input frequency of a ham radio repeater.

The challenge is that there are several stations on the frequency. How can I “fix” the krakensdr to ONE signal?

when receiving signals from different directions at the same time (i.e. in quick succession), the kraken should continuously display targets from different directions.

is it possible, for example, to restrict the target area or can it recognize the signal as unique due to technical specificity and ignore all others?

how do you proceed here?

thanks and greets

[krakenrf_carl]

This is not really easy to do, because to the Kraken any signal is just a signal, it has no way to determine the voice of who is talking.

The easiest way at the moment would be to have a second operator with their finger on the app start/stop mapping button. When the user you want to DF is speaking, start the map logging. When they stop talking, stop the logging.

[SignalMedic]

I filter by direction with this project.

GitHub - canaryradio/Kraken-to-TAK-Python: Kraken-to-TAK with a dashboard and...

[dbvanhorn]

A switch on a cable would be good here. Push the button while the target is transmitting.
If only there were I/O pins available for it.

[RFPS]

Is it a way to set a threshold above a certain dBm value so it will capture only strongest signal?

when you get near the location the Kraken will capture only the strongest above the setting.

ask other station on the repeater to lower their output to the minimal power needed to access the repeater.

Good luck with our hunting.
Roger
VE2 RFS

[RFPS]

found the answer in Kraken app on my iPhone in setting.

Minimum Required Power: Discard any values below a certain received power level. Generally not needed unless you really need to reduce log file sizes.

it is set at -200 you see RX level in the spectrum so you could put a value 10 dB lower

Roger

[krakenrf_carl]

The minimum power required filter won’t work if your multiple signals are all interleaved together over the same block length though. If the signals are spaced apart by a few seconds, then it will be fine.

[Vadim]

This topic is very relevant! The human voice (legal or not the transmitter) can be determined by ear. Sometimes illegal digital transmitters (for example, LoRa) work with a very wide bandwidth, which partially or completely overlaps with another similar transmitter in frequency. But they do not work simultaneously. I am attaching two pictures with such cases.

It is possible to separate one of them from the other only on the receiver’s SDR waterfall by their characteristic pattern.
I have a suggestion on how to improve KRAKEN to separate overlapping transmitters.
Need a button " delete last 5 seconds mapping " If I see or hear a legal transmitter, I press a button " delete last 5 seconds mapping ". If I see or hear an illegal transmitter, I do not touch anything and continue moving towards the target. It will also be very useful to configure how many seconds to erase when you press such a button.

[dbvanhorn]

I just wrote this:

Pickle button for jammer hunting

What would it take in terms of a fee/donation to get a “pickle button” function on the GPIO pins? I really believe this is essential to hunting something like a repeater jammer. I don’t trust my ability to hit the screen buttons accurately while moving, nor should I need that distraction while driving. Most of the traffic on the repeater input frequency will be legit users. Without the button, I will end up clearing the data over and over and over waiting for the jammer to pop up. I also can’…

I think we’re looking for the same thing or close to it.

[Vadim]

Yes, we are looking for something similar. I suggested the button to erase the last seconds of mapping because digital signals are very short (one or two seconds). I will not have time to press the start/stop button for mapping. During this time it is impossible to separate one transmitter from another.