[NLRS] 915 MHz ISM Band and Digital Modes

[Dr. Gerald N. Johnson]

I believe there are lots of signals across the 902 MHz band. We 
concentrate mostly at 902.1 for repeater inputs and narrow band because 
the broad band users have to avoid the band edges, but fill the rest 
solidly and some are not low power, like pagers. I was consulted years 
ago about a bank 915 link between a branch and the main office in Boone 
Iowa that was messed up by a pager located between the two locations. 
While good directional gain antenna can help the desired received signal 
strength it can also increase the undesired if that undesired is in the 
same direction. 915 with power and antenna gain should work but there 
will be lots of QRM from the unlicensed equipment spread all over the 
territory.

73, Jerry, K0CQ

On 7/11/2016 10:48 AM, Russ Ramirez wrote:
>
>
> Since David Palm asked a 902 MHz related question, I thought I would ask a
> another question about 33 cm.
>
> Are any of you doing any work with digital messaging or beacons up at 915
> MHz?
>
> Since as amateurs we are able to use the ISM band in ways that unlicensed
> makers cannot, this has been an area of recent interest for me as a number
> of microcontroller designs utilizing the RFM69HCW -
> http://www.hoperf.com/rf_transceiver/modules/RFM69HCW.html have appeared
> lately.
>
> For general wireless communication between microcontrollers, 915 MHz works
> far better than 2.4 GHz WiFi, BLE, or ZigBee do around your home/office,
> and 915 devices are much easier on battery/solar power.
>
> For the amateur who might already have 33 cm loopers and amplifiers, the
> use of these small devices opens up some interesting possibilities for very
> little investment.
>
> Thoughts?
>
> Russ, K0WFS
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