[OZAPRS] APRS Tracker

[Gerard Hill]

So do beacons.
They operate on coordinated and approved frequencies.

Cheers ... Gerard, VK2IO

On 29/11/2010 3:29 PM, Compton Allen wrote:
> 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/
>> _______________________________________________
>> OZAPRS mailing list
>> OZAPRS at aprs.net.au
>> http://lists.aprs.net.au/mailman/listinfo/ozaprs
>>
>

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