[OZAPRS] APRS Tracker

[Ray Wells]

What a load of rubbish! Define 'compliant' and 'substandard' in a way 
that's relevant to the amateur LCD - the only standard with which we 
must comply.

The humble TNC2 compatible and an assortment of other modems have served 
packet well since its earliest days in the early 1980's and, until the 
ax25 specification is changed, they will continue to do so.

There's no denying the SCS is a fine piece of gear but you berate fine 
equipment that has, and continues, to serve the fraternity well, *if set 
it up properly*.

Ray vk2tv

On 29/11/10 17:44, kevcav wrote:
> Trackers without a receiver do not conform with the technical 
> specifications under which we all have agreed to operate  when we were 
> licensed.
>
> If you want a good system for HF use then get yourself an SCS DSP 
> Tracker / TNC,  all other solutions are simply non compliant and 
> substandard in their performance.
>
>
>
>
>
> On 11/29/2010 2:29 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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