The Back Shed: HC-12 RF module antenna.....

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Topic: HC-12 RF module antenna.....

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srnet
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Joined: 08 August 2014
Location: United Kingdom
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Posts: 148

Posted: 13 January 2017 at 6:42am \| IP Logged

Phil23 wrote:

srnet wrote:

An RTL USB dongle (around Ł6) connected to a laptop will do a very good job of measuring signal strength as well.

RF Explorer looks like a neat little device....

It sure makes tuning antennas a breeze, and for what it does its not expensive.

You can make a single frequency signal strength meter quite easily with a a RFM22B, just have it constantly reading the RSSI register and print it out to a display.

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Phil23
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Joined: 27 March 2016
Location: Australia
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Posted: 13 January 2017 at 9:47pm \| IP Logged

srnet wrote:

It sure makes tuning antennas a breeze, and for what it does its not expensive.

So I went & dug the USB tuner up a few minutes ago & plugged it into my laptop.
2 minute exercise to install the drivers & software.

This is what I'm seeing from my HC-12's using the approximately 4" whip antenna supplied.

That spike is the master polling the slaves; (master under a metre from me)
I can just see the slaves respond; (about 8m away).
As they are interrupt driven, their response is almost instantaneous, so easily lost on the spectrometer.

Could easily address that by giving them a 200ms pause for testing purposes.

It does peak a bit higher than seen above, just hard to get a screen capture.

Maybe for testing purposes a bit of code to continuously send data would be the go.

Phil.

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