[OZAPRS] APRS Tracker

[VK4UN]

??What a hornets nest!!
a bit like opening up Pandora's box

VK4UN

----- Original Message ----- 
From: "Darryl Smith" <darryl at radio-active.net.au>
To: "Australian APRS Users" <ozaprs at aprs.net.au>
Sent: Monday, November 29, 2010 9:44 AM
Subject: Re: [OZAPRS] APRS Tracker


> 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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