The LORA chips usually have a TX_CTRL output to switch the antenna between its TX and RX pins… The amplifier also has an input for manually switching it between RX and TX as opposed to the slow automatic detection. I got this working successfully for TX by tapping into that control signal and buffering it so that it can “manually” switch the amp between RX and TX and none of the data gets cut off. This same control signal can also be used to operate an RF switch that could let you switch beween dedicated RX and TX antennas. What i found with these modules is that they attenuate RX too much so I am bypassing it for RX
Interesting. You would think that if it is clipping the header, you would get the same packets dropped when you are up close as far away. Have you tried turning the spreading factor as high as possible and the data rate as low as possible. This would increase the time it takes to send the synchronization header. Less of the header would be clipped. Interesting.
i would Rip the RF Shield off an have a Good look at it's guts even take them to be X rayed (Fake bootleg IC Hardware) and see if the dev meshtastic can add in a Pin on the ESP32 To come on Sooner than it TX to Alert the amp to switch Much sooner
Just found your channel now, I'm very interested in the LoRa and meshtastic. I wonder if the small amount of extra cable required to patch the amplifier is introducing just enough loss to negate the amplifier gain. Just a thought. Can't wait to see more of this project
@@PRSH8YAPROJECTS If your useing 400MHz you could be interfering with public safety services. Are you a ham? The US ham 70cm band states at 420Mhz. If your licensed, you can use that.
I appreciate the comment but I would be stupid to use a frequency that I am not licensed for especially posting a video for all 3 letter agencies to watch.
Thank for the update from UK
I will be testing a few ideas from comments and will do an update video with that info.
The LORA chips usually have a TX_CTRL output to switch the antenna between its TX and RX pins… The amplifier also has an input for manually switching it between RX and TX as opposed to the slow automatic detection. I got this working successfully for TX by tapping into that control signal and buffering it so that it can “manually” switch the amp between RX and TX and none of the data gets cut off. This same control signal can also be used to operate an RF switch that could let you switch beween dedicated RX and TX antennas.
What i found with these modules is that they attenuate RX too much so I am bypassing it for RX
This is great information
Any updates? I am interested in this setup
Interesting. You would think that if it is clipping the header, you would get the same packets dropped when you are up close as far away. Have you tried turning the spreading factor as high as possible and the data rate as low as possible. This would increase the time it takes to send the synchronization header. Less of the header would be clipped. Interesting.
That is good information, I will try that.
i would Rip the RF Shield off an have a Good look at it's guts even take them to be X rayed (Fake bootleg IC Hardware)
and see if the dev meshtastic can add in a Pin on the ESP32 To come on Sooner than it TX to Alert the amp to switch Much sooner
We are on the same page
Just found your channel now, I'm very interested in the LoRa and meshtastic. I wonder if the small amount of extra cable required to patch the amplifier is introducing just enough loss to negate the amplifier gain. Just a thought. Can't wait to see more of this project
Make one dedacted to transmit and one recive if possible
I thought about that. It's all in the switching and they don't allow dedicated.
Is that a 433mhz amp on 915mhz? Are you in the UK?
868 mhz in the uk
I am in the USA, I am using a band in the 400ish MHz
@@PRSH8YAPROJECTS If your useing 400MHz you could be interfering with public safety services. Are you a ham? The US ham 70cm band states at 420Mhz. If your licensed, you can use that.
I appreciate the comment but I would be stupid to use a frequency that I am not licensed for especially posting a video for all 3 letter agencies to watch.
@@PRSH8YAPROJECTS Not trying to be insulting. Sorry if I offended.
433mhz, ham bands in US
Thanks for your comment!
If you are in US , you should be on 915mhz
Unless you are licensed