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| Lora RA-01 better range than RA-02? |
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| panoss:
I 've made a Lora pair (Sender & Receiver) using Lora RA-01. It's working with the spring antennas that come with the module. I gave it to a client. Now I 've made a replacement of it, a pair of Loras using Lora RA-02. I 've tried every possible antenna type (spring, whip half length, whip 1/4 length, dipole). Also tried to maximize range with software: --- Code: ---LoRa.setSpreadingFactor(12); LoRa.setSignalBandwidth(62.5E3); LoRa.setCodingRate4(8); --- End code --- But I have not managed to get the range of the first pair (which works with the default SpreadingFactor, Bandwidth and CodingRate). I get less than half of the range. How is it possible the spring antenna (which is supposed to be crappy) on RA-01 to perform so much better than any other antenna I 've tried on RA-02? (or maybe it 's not the antenna but something else?) |
| Apollyon25_:
A quick google image search shows the RA-02 has a small coaxial connector fitted, which the RA-01 doesn't have. So probably the RF path is output to the connector instead of the PCB solder pad of the 'module'. FYI - Pictures and schematics help others to spot your errors/problems. |
| Dave_PT:
@Apollyon25_ is right. For example, this adapter board has no antenna connection. You really need to use the u.Fl connector to connect to your antenna. |
| panoss:
Yes, I know, at RA-02 I am using a connector with a coaxial cable attached to it. I should have mentioned it. |
| Apollyon25_:
Where/what is your antenna? The connector is a 50ohms connection, however your coil antenna version on the RA-01 probably has a matching network to impedance match the antenna (not 50ohms) to the LoRa transceiver output, which is 50ohms. Again, google image search shows this - https://mikroelectron.com/Product/10KM-433M-LORA-LONG-RANGE-WIRELESS-MODULE-RA-01 (third image has three components arranged as a U which are most likely the matching network) |
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