[OZAPRS] APRS Tracker

[Compton Allen]

Repeaters Tx with out listening.

On 11/29/10, Darryl Smith <darryl at radio-active.net.au> wrote:
> People,
>
> From my point of view, the impact is in my mind at least partially impacted
> by the duty cycle, the randomness of the duty cycle and the location of the
> transmitter.
>
> 	* Once every 5 seconds is bad and once every month might be OK
> 	* A random variance of 25% is better than no variance (a random delay
> between 45 and 75 seconds is better than every 60 seconds)
> 	* a transmitter without receiver in the Strezleki desert is more acceptable
> than one in the Sydney CBD.
>
> My personal view is that in most applications, since the cost of a full
> RX/TX device is almost the same as a TX device, a RX/TX unit therefore
> should be used. There are in my mind some applications where having a
> receiver might not be acceptable. This would include
> 	
> 	* High interference situations where a transmitter will work but a receiver
> will not (Imagine a device transmitting in the vicinity of a spark gap
> transmitter)
> 	* Where the transmitter is disposable after a single use (down a mine, or
> in a balloon over the ocean)
> 	* Where some other form of control is used (remote controlled transmitters
> for field strength measurements)
> 	* Where there are unusual mechanical constraints restricting the use of an
> RX (really small devices)
>
> Rule of thumb... Don't transmit without receive.
>
> Darryl
>
>
> ---------
> Darryl Smith, VK2TDS POBox 169 Ingleburn NSW 2565 Australia
> Mobile Number 0412 929 634 [+61 4 12 929 634 Int] - 02 9618 6459
> www.radio-active.net.au/blog/ - www.radio-active.net.au/
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>

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