[OZAPRS] APRS Tracker

Ray Wells vk2tv at exemail.com.au
Mon Nov 29 15:59:13 EST 2010


They're also licenced by the ACMA to do what they do and where they do it.

Ray vk2tv

On 29/11/10 15:38, Gerard Hill wrote:
> 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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