How to choose the gain for helium hotspot antenna

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Author : Tony Huang
Update time : 2022-03-31 18:18:06

How to choose the gain for helium hotspot antenna?

 

The Helium network is not just for earning $HNT, it can connect everything on the future, and may achieve the real IoT internet of things by the helium network, so a good helium antenna will benefit on the future!

 

How to choose the gain for the helium antenna?

 

Although it’s not the most important point, but it seems that it’s what most people concerns. First of all, there is a misconception that the higher gain the better, because the actual gain also relate to the antenna effective angle, the antenna can achieve the gain only within the effective signal coverage, however, the higher gain will have narrower effective angle, see below picture, the high dbi value comes with a narrow signal.

If you are in a city, a low dBi antenna will benefit the hotspot more, 3 dBi or 5 dBi may be enough.

On suburb area, 6 dBi or 8 dBi with a proper angle is the perfect choice.

 

While on rural area, a 10 dBi or 12 dBi high gain antenna can reach far, but do remember that the obstacle may interfere the antenna, you may

need to take more time on setting the antenna.

Antenna length has a close relationship with the antenna gain, 12 dBi antenna will have a length of 210mm, the cost for shipping will go straight up and with the narrow effective angle, the antenna may not work efficiently if you choose 15 dBi ones.

How to check the quality of the helium antenna?

It seems hard to know whether the antenna you received up to the gain it declared, one simple judgement is the antenna length, because the antenna characteristic define that specific antenna gain require a fix length, a table below show the relationship between antenna length & antenna gain.

Antenna gain

3 dBi

5 dBi

6 dBi

8 dBi

10 dBi

12 dBi

Antenna length

30 cm

70 cm

90 cm

130 cm

170 cm

210 cm

How to know what the antenna frequency you need?

 

You can get the frequency at helium.com, normally, Europe use 868MHz and US use 915MHz.

 

Does the antenna work on all brand helium miner?

 

Yes, helium hotspot antenna is a passive device, which means that it compatible with all brand helium miner.

Part 2. About Helium hotspot antenna accessories

 

Helium enclosure kit

 

If your miner and the antenna connect with a 15m or even 30m extension cable, the loss may be high, and you can think of buying a Helium enclosure kit to assemble the miner and antenna as close as possible.

Is lightning arrester necessary?

 

It depends, if your antennas are in rural area and have the potential of lightning risk, a lightning arrester is necessary.

How to choose Extension Cable?

 

An extension cable is always necessary for the helium antenna kit, LMR400 is the most popular, LMR600 cable however, the performance is similar with LMR400 and the cost is too high, we didn’t recommend, for short distance, LMR195, RG316 and flat cable is available and the performance is acceptable.

 

Solution 1: LMR400 Cable, N Male to RP SMA Male, L= 1m, 3m, 5m, 7m 10m, 15m

Solution 2: LMR200 Cable, RG316 Cable, N Male to RP SMA Male, L= 1m, 3m

Solution 3: Flat Cable

DIY

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