DollaTek U.FL IPEX to SMA Connector Antenna 868-915MHz for Lora Board Lora32u4 II Wifi Lora32-5pcs

Fontionnent pour des modules LORA Heltec avec Meshtastic.Pas forcément vu d'amélioration en terme de portée, mais elles sont plus solides que celles d'origine

I was hoping for 868mhzz but all 915mhzWarm the cover a little to remove it if you want to change the very small coil inside

I tested these antennas by connecting to a Nano VNA tester. They all showed to be tuned to the lower frequency 868 Mhz band. To get the best SWR centered around 915 Mhz remove the plastic covering on the antenna by using a flat blade screw driver to pry the covering off. The covering is pressed fit over a knurl on the SMA connector. Underneath is a spring wire antenna. Just removing the cover made the antennas almost exactly tuned to 915Mhz with a SWR of around 1.2:1 or better. They can be cut slightly - cutting 1mm or less with wire cutters will also raise the frequency. I trimmed about a 1 mm off only one of the antennas because it seemed to be tuned to a slightly lower frequency and as a test. All my checks were done without the use of the included IPEX to SMA cable.

Ottimo