MicroP25RX

[robnj74]

There isn't a way to edit the configuration via PC yet, but as of about 5 minutes ago, there is an application available to monitor. A few days back, goldmyne99 told me about a language / development environment called "Processing". It has an arduino / sketch type interface and the language is very close to Java. It is supported on Windows, Mac, and Linux. The application that we developed is called MicroP25RXMon and will allow you to monitor your MicroP25RX on a PC with a display and PC-audio playback over the USB link. The application is currently a single "sketch" file named MicroP25RXMon.pde and can be found here: GitHub - tvelliott/MicroP25RXMon: A monitoring application for the MicroP25RX receiver written for the Processing development environment It is very easy to install the Processing development environment and to run the MicroP25RXMon.pde sketch. It may require that you have a GPU video card with OpenGL support using the default code. If you have troubles with the display being slow, try changing the 'have_gpu=1' to 'have_gpu=0'. With regard to being able to edit the configuration via the application, that will take more effort. This is a start in that direction. In order to use the new application, you will need to update the MicroP25RX firmware to fw1230-03. After you get it up and running, you can generate a Windows executable application under FILE->Export application. Happy New Year!

View attachment 133456

Seems to work pretty good for me, sound is passed right to the laptop speakers.

 

[btt]

I added this to the github readme regarding the MicroP25RXMon application. This may help resolve some performance issues.

Highly recommended, to edit the memory settings. FILE->Edit preferences, change to enable the Max Allowed Memory of
512M. If you are having issues with slow graphics or audio issues, this may resolve the issue.

 

[btt]

There is an update to the MicroP25RXMon code. (on github). This fixes an audio related issue.

 

[KevinC]

Anyone else notice with the newest FW ( 2022-12-30-03) your RSSI is much lower? I can go back and forth between the last 2 FW builds and the latest is always about 8-9 dB lower.

 

[robnj74]

Anyone else notice with the newest FW ( 2022-12-30-03) your RSSI is much lower? I can go back and forth between the last 2 FW builds and the latest is always about 8-9 dB lower.

I have not seen a change in my RSSI values, they are at the same levels as previous firmware.

 

[KevinC]

I have not seen a change in my RSSI values, they are at the same levels as previous firmware.

Interesting. I can positively switch back and forth and the current is always lower.

 

[robnj74]

Interesting. I can positively switch back and forth and the current is always lower.

OK I re-evaluated it and I see what you're talking about now.

 

[KevinC]

OK I re-evaluated it and I see what you're talking about now.

Good. It’s not just me then.

 

[btt]

The RSSI issue should be resolved in fw1231-01.

 

[btt]

The MicroP25RXMon application has been update. The audio code has been moved to a separate file and adds a separate thread for the audio playback. This will prevent choppy audio being caused by a slow or busy machine. You will need to get the new files and recompile to use.

 

[robnj74]

I have a question with respect to RSSI values. One pic is the MicroP25RX and the other a HackRF-One The values shown by the MicroP25RX appear to be half that of the HackRF-One. Can that be accurate?
For reference the same exact antenna was used with the devices located in the same place during measurement. Also note the HackRF-One gain was turned down and it's amp turned off. Edit: The MicroP25RX was set to LNA-08, MIX-AUTO,VGA-10

 

[btt]

I have a question with respect to RSSI values. One pic is the MicroP25RX and the other a HackRF-One The values shown by the MicroP25RX appear to be half that of the HackRF-One. Can that be accurate?
For reference the same exact antenna was used with the devices located in the same place during measurement. Also note the HackRF-One gain was turned down and it's amp turned off. Edit: The MicroP25RX was set to LNA-08, MIX-AUTO,VGA-10

You are comparing dBFS with dBm. dBFS is dB relative to full-scale measurement of an ADC. dBm is dB relative to power of 1 milliWatt.

 

[FreqNout]

@btt excellent info on dBFS! Just to add...all these sdr software packages like SDR trunk only display dBFS. There also is no way to directly compare RSSI between any radio because of unknown gains and bandwidth used by the software in each radio displaying their RSSI. Simply changing BW will change the noise floor of any RF power measurement.

 

[btt]

fw2023-0101-01 is available. I reverted some recent changes to P25 P1 audio. Both P1 and P2 are sounding really good this morning while monitoring with the latest release of the MicroP25RXMon software. In the latest, the audio code was moved to a separate thread from the thread for the main-loop. It has not been tested on Windows yet. Let me know if there are any issues.

 

[dustinsterk]

Love the new top bar that tells you what the buttons do! Nice improvement @btt and @goldmyne99

 

[btt]

Love the new top bar that tells you what the buttons do! Nice improvement @btt and @goldmyne99

Updated the firmware for both MicroP25RX and WIo to allow changing the backup/foreground color of the new top bar / button descriptions. When making a BACKUP file, there are now LINE0_BG and LINE0_FG colors that can be defined in the [GLOBAL_CONFIG] section.

 

[maus92]

I have a question with respect to RSSI values. One pic is the MicroP25RX and the other a HackRF-One The values shown by the MicroP25RX appear to be half that of the HackRF-One. Can that be accurate?
For reference the same exact antenna was used with the devices located in the same place during measurement. Also note the HackRF-One gain was turned down and it's amp turned off. Edit: The MicroP25RX was set to LNA-08, MIX-AUTO,VGA-10

HackRF is not a super great receiver, aka not particularly sensitive or well filtered. The RSSI of 88.5 dBm measured by the uP25RX is actually pretty good. In the end, DAQ is what matters, and that cannot be measured.

 

[KevinC]

Tried the latest FW...


2023-01-02-01

• audio related changes

Lots of popping and crackling audio. Reverted to the last one I had downloaded ( 2023-01-01-02).

 

[btt]

Tried the latest FW...


2023-01-02-01

• audio related changes

Lots of popping and crackling audio. Reverted to the last one I had downloaded ( 2023-01-01-02).

What do you have the volume level set to? Default?

 

[KevinC]

What do you have the volume level set to? Default?

I didn’t change it, but it was on “Normal” before I updated. I didn’t check or change afterwards.