[sdiy] wireless patching

[Gordonjcp]

On 26 May 2017, at 19:58, mskala at ansuz.sooke.bc.ca wrote:

> On Fri, 26 May 2017, Tom Wiltshire wrote:
>> That doesn't sound too impossible given the 27MHz transmission frequency.
>> The standard 50Hz PWM seems like a pretty light load for such a signal. How
>> many channels can an RC controller handle? Are they multiplexed?
> 
> I described the protocol in my earlier message.  The number of channels is
> variable but typically eight.  Bandwidth would be a few kilohertz
> depending on how much resolution you want and how much signal/noise you
> think you can play with.  It is not a particularly bandwidth-efficient
> encoding.  I'm sure that the bandwidth in practice is limited by
> regulatory concerns - if you want a much higher sampling rate and you want
> to do it *legally*, then you're going to either be limited to flea power,
> or forced up into the UHF.
> 

Given the size of aerials at 27MHz, UHF might not be a bad idea.

As for "legally", bear in mind that some of us run tens of kW ERP on 2.4GHz...

-- 
Gordonjcp MM0YEQ