[NLRS] 915 MHz ISM Band and Digital Modes

[Russ Ramirez]

Thanks Jerry. As I do not have a 'real' antenna up yet for 33 cm, I am not
very familiar with the congestion or QRM in general yet, but that will be a
good step 1 once I do and can get a look at/feel for the spectrum.

73, Russ, K0WFS

On Mon, Jul 11, 2016 at 11:17 AM, Dr. Gerald N. Johnson <geraldj at netins.net>
wrote:

>
>
> 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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