I understand, English is not my first language as well, feel free to ask me anything I will try to help as best as I can.
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You as well , btw your written English is really good
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It has, but I can still tell when a translator is being used Lol
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Very nice build, nice solution for GPS antenna, is with build in LNA?
How did you power GPS LNA?
Why use RG174?
GP = 0,0 gain
Low SWR its match 50 Ohms, not show about antenna radiation pattern
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I dont know if the PCB GPS ant connector have 3 - 5 Volt BIAS-T to power de GPS LNA. Mabe the programmers know if needed to turn ON the BIAS-T than you have 38 dB extra.
The uBlox GPS on the t-beam is capable of supplying a 3v bias, but it seems from what others have said that itās pretty random whether itās enabled or not when we receive them. Some people have receive t-beamās with the bias voltage disabled, some with it enabled.
I donāt know enough about the t-beam yet to know if weāre able to pass commands direct to the gps chip via serial. If we could pass commands to the chipās serial line the bias could be enabled (if currently disabled).
If itās something that IS do-able through the meshtastic firmware it might be nice if a checkbox enable / disable option was added to the admin settings interface.
Ric
I am looking to build the most efficient receiver antenna for my 433 MHz RC car. I would like to build my own antenna and Iām interested in your designs here.
Kool, Feel free to duplicate any of the designs, It would be best to have a VNA or NVNa to tune, for that application A loaded Dipole or whip should so the trick all you need to do is tune it.
Would this work well in a 433mhz RC car as a receiver antenna for best distance? Is this a 5/8 wave antenna or 1.25 wave? Thanks.
There are several designs that you could use, But I think a 1/2 Wave Dipole would do the trick, your RC car may have a long antenna though.