[OZAPRS] ISS Packet system down....
vk4tec at tech-software.net
Wed Aug 2 09:44:06 AEST 2017
Did u know we saw trees bend 1090 MHz
Sent from my iPhone
> On 2 Aug 2017, at 8:59 am, vk2tv <vk2tv at exemail.com.au> wrote:
>> On 01/08/17 16:03, Andrew Rich wrote:
>> Very much depends on antenna altitude
> True, but the aircraft FL has the most impact. For an antenna here (site location 8m ASL), mounted 1m AGL, the radio distance to a plane at FL 390 (12000m) is 455km. I only gain another 19km (to 474km) by raising the antenna to 30m AGL. Those figures are for my best direction, a virtually uninterrupted path to the Pacific Ocean. If I pick the reverse direction I'd be lucky to get 150km due to the Great Dividing Range rising 4000-5000ft just west of me. My antenna is currently inside, against a south facing window, and I see some aircraft, at around FL 350, out to around 250-350km to the east. Other directions only serve to prove how much attenuation bricks and mortar, and a great lump of hill have at 1090MHz!
>> I made a power over Ethernet box here as well
> I didn't get that adventurous. I'll run separate ethernet and 12V cables - it's only a 20ft run that easily accessible.
>> Still can't beat the hill installation
> Don't forget that old rule of thumb - "no matter how high the hill, there's no substitute for height above that hill". In other words, use a big tower if you can.
>> I have noticed on occasion a dump1090 data break
> Do you mean the program just stops decoding? I've not struck that problem.
>> Never sorted it out
> Ray vk2tv
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