$69 Gemtek Gateway: The Things Indoor Gateway

(Verkehrsrot) #85

must be in horizontal position with plugged USB C.

(bluesensing) #86

but, when the wallplug is in horizontal position :slight_smile: ?

(Verkehrsrot) #87

No, doesn’t work. You would need a 90 dregees USB-C for this, then it could work.

(Paul Dekkers) #88

Also being confused by the TTN outage at first (that was not on status.thethings.network? but most of my gateways appeared down anyway) I’ve got the unit working as well.

What I’m surprised about, is the reception of LoRa, and I’m curious about experiences from others. I see some frames being received by gateways on the other side of town but not this gateway (for a sensor with SF11) and another sensor with SF9 only comes in when I turn the gateway towards it. Sometimes. Without any user-interface it’s hard to diagnose whether the WiFi signal is good, yet the “last seen” messages appear to come in at the same time. Other experiences?

(Dmth) #89

That’s how the Giveaway-device (868MHz) looks from inside:
loramodem loramodem_bottom loramodem_ufl powersupply

(Arjan) #90

That answers the question if a simple firmware upgrade could change a US915 unit into a EU868 unit (while the antenna would be troublesome then). No, that would at least need some soldering as well:

US or EU


Is that a 0 ohm resistor or a PCB trace (that will have to be cut)?

(Verkehrsrot) #92

maybe it’s only a passive “DIP-Switch” which is read by firmware?

(Arjan) #93

Given the distance from the antenna and its connector on the very same board, I’d guess it doesn’t change much in that antenna path. But this is not my area of expertise at all… Maybe some might be able to tell us if the chip sets would support multiple regions to start with?

As an aside, the “also available” made me laugh; apparently it needs to be mentioned separately?


(Bantob) #94

I have followed these steps. After reboot how do i register it in the TTN console? thanks

(Dmth) #95

Seems to be 0 Ohm resistor, as measured as 0 Ohm resistance.

Detailled photo might expose a UART Inferface:

Antenna CON1 EU_US_Jumper TP1 TP3TP4TP5 UART UFL-Connector USBC

(Bantob) #96

ok finally got it. I found EUI in its page and add it in the console registration page! Now is online.


After this morning :slight_smile:
Online, get data from it. So it works
Now look how we get more info out off the GEMTEK-box
Powered over USB-C are 230 volt connection both are working well.
Thanks DMTH for the look inside

(Afremont) #98

The four solder pads in a row certainly looks like a good candidate for being a UART interface.

(Afremont) #99

Maybe the “also available” version is 433MHz, or whatever that band is. In an ideal world, there would be differences in passive components leading to the antenna and the antenna itself, between the US and EU versions, but it’s far from an ideal world these days. So many modules for sale that include 2.4ghz wifi antennas, instead of 900MHz antennas, according to actual tests run by people with rf equipment.

(Humaxnerd) #100

I have tested is and it is a UART. Some output.
019-02-02 14:49:46.264 [SYN:INFO] Avg MCU drift vs SX1301#0: 1.0ppm
2019-02-02 14:49:46.283 [SYS:DEBU] Free Heap: 19512 (min=17304) wifi=5 mh=7 cups=8 tc=4
2019-02-02 14:49:47.287 [SYS:DEBU] Free Heap: 19512 (min=17304) wifi=5 mh=7 cups=8 tc=4
2019-02-02 14:49:48.290 [SYS:DEBU] Free Heap: 19512 (min=17304) wifi=5 mh=7 cups=8 tc=4
2019-02-02 14:49:49.294 [SYS:DEBU] Free Heap: 19512 (min=17304) wifi=5 mh=7 cups=8 tc=4
2019-02-02 14:49:50.298 [SYS:DEBU] Free Heap: 19512 (min=17304) wifi=5 mh=7 cups=8 tc=4
2019-02-02 14:49:51.301 [SYS:DEBU] Free Heap: 19512 (min=17304) wifi=5 mh=7 cups=8 tc=4

Pin close to GND is TX from gateway

(Jose Marcelino) #101

All gateways I know have (notch) filters so I doubt you can really get a worldwide gateway.

(Bahnhofsoma) #102

I have added the wifi ap, selected the legacy packet forwarder and used the mac-address within in the middle part described above, but no connection. Could anyone help?

(Beacon) #103

If anyone’s interrested here’s the datasheet of the onboard antenna.


Or you place it on a small cardboard packing box. With a hole for the USB-c connector :grinning:
Then you can just put it on your desk