[chbot] Group project: Wireless remote security monitor

[Mark Atherton]

I love Helmuts idea of the missile launcher, but can't help but think a 
localized jammer will be a bit less work.

Now, Mr Gardner, you have your amateur license, and apparently, 
according to your license :

https://www.rsm.govt.nz/about-rsm/pdf-and-documents-library/spectrum-policy/official-information-notices-gazette/gurl-notices/amateur-radio-operators/amateur-radio-operators-gurl-2017.pdf

... you are allowed a kilowatt on 2.4GHz; some PAL FM video would 
legitimately occupy some broad spectrum. Possibly a test card with your 
callsign.

In terms of antenna, the ever popular grid pack 
(https://www.trademe.co.nz/Browse/Listing.aspx?id=1608128429) but maybe 
a lower gain version, with a wider beamwidth.

You may only want to put this on the air (maybe 20 mins at a time - 
drone battery life) when a threat has been detected.

For a broadband receiver, AD8318, with 2.4GHz Band pass filter 
https://www.trademe.co.nz/Browse/Listing.aspx?id=1607039465, and maybe 
preceded by a preamp

Interestingly, just found 
https://www.ebay.com/sch/i.html?&_nkw=361948176468 and 
https://www.ebay.com/sch/i.html?&_nkw=282583880052

As usual, the Christchurch Robotics Group does not condone illegal 
activities, but does encourage free-thinking and discussion.

Regards, Mark