[OZAPRS] VK2HAB 25/05/16

[Matthew Cook]

I'd suggest you research polarisation of antennae a little more and then
think about that some more.  No circular polarised antennas are not the
solution.

73

Matthew
VK5ZM

On 29 May 2016 at 05:59, Andrew Rich <vk4tec at tech-software.net> wrote:

> Hang a yagi looking back at earth
>
> -----------------------------
> Sent from my iPhone
> Andrew Rich
> vk4tec at tech-software.net
> www.tech-software.net
> 0419 738 223
>
> On 26 May 2016, at 11:08, Matthew Cook <vk5zm at bistre.net> wrote:
>
> Hi Norm,
>
> That sounds about right with respect to range, height is might !
>
> Also don't forget that if you've got local traffic on a digi that this
> will tromp on a balloon payload even at altitude.  It all comes down to
> sneaking through the gaps.  Even with altitude you still have free space
> path loss and the capture effect to contend with a the digi receiver.   It
> is always sensible to run open squelch with software DCD if your packet
> engine supports it.  That means weak signals don't have to crack the mute
> of the radio first or get truncated if it drops too low.
>
> Another quirk with balloons is the antenna pattern at altitiude can have
> severe nulls in it, so being directly under a balloon can make it very
> difficult to decode (from bitter experience) when people 50km or more can
> copy it fine.  YMMV.
>
> 73
>
> Matthew
> VK5ZM
>
>
>
>
> On 25 May 2016 at 17:44, Norm McMillan <vk3xci at gmail.com> wrote:
>
>> Thank you Mathew,
>>
>> 100,000 feet  is 30480meters, range 625km.
>>  VK3RBT to VK2HAB 510 km.
>>
>> Seems odd that VK3RBT picked it up but not VK3RBX, which is closer.
>> Better check the squelch/sensitivity on RBX I guess
>>
>> norm
>> vk3xci
>>
>> On Wed, May 25, 2016 at 4:55 PM, Matthew Cook <vk5zm at bistre.net> wrote:
>>
>>> Norm,
>>>
>>> Yes 100,000ft for a HAB is not uncommon.  See if you can find an online
>>> radio horizon calculator and punch in 100,000ft. Take the position of the
>>> balloon when you received the posit and draw a circle around it from the
>>> horizon calculator.  I'm fairly certain you'll find Bambil tanks is within
>>> this circle.
>>>
>>> We regularly have VK3 stations receive our HAB telemetry with the
>>> balloon 25kms or more in to the stratosphere.  Height is might !
>>>
>>> 73
>>>
>>> Matthew
>>> VK5ZM
>>> AREG/Project Horus
>>>
>>> On 25 May 2016 at 16:12, Norm McMillan <vk3xci at gmail.com> wrote:
>>>
>>>> Copied a few (20 or so) packets from this event. the path is
>>>> interesting to say the least. Is there a digi not correctly identifying or
>>>> did VK3RBT at Bambil Tank REALLY receive the balloon direct.
>>>>
>>>>
>>>> 0:TNC->
>>>> VK2HAB-11>APT314,VK3RBT-1,VK2RBX-1,WIDE2*:!3349.O1S/14701.26E0161/003/A=100594/UpLift
>>>> Balloon Flights|$"!!!!|
>>>>
>>>> And did it really make it to 100594 feet?
>>>> And what does the   |$"!!!!|   at the end mean. I noticed the first two
>>>> characters change as the flight progressed
>>>>
>>>> Due to my inexperience with xastir I didn't log it, but I have a screen
>>>> shot!
>>>>
>>>>
>>>> norm
>>>> vk3xci
>>>>
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