ARLA/CLUSTER: A historia de dois pico balões australianos que ainda circunvagam a Terra

[João Costa > CT1FBF]

Pico balloon detected circumnavigating the earth

The Aussie solar powered pico balloon *PS-56* that had a catastrophic GPS
tracking failure, has been tracked by its weak CW signal, having encircled
the southern hemisphere.

Meantime its sister balloon* PS-57* crossed over the equator and is now in
the northern hemisphere.

Balloon PS-56 was put up by *Andy Nguyen VK3YT* from Melbourne on Saturday
November 28, who said it passed the usual pre-flight tests, but shortly
after it went up there were no WSPR or JT9 packets, but the balloon payload
sent the default Morse code sequence only.

That situation has been likened to the historical docudrama film on the
Apollo 13 moon mission which used the phrase, ‘Houston, we have a problem’.

Andy VK3YT put out a call for a watch-out for the balloon. Not giving up
easily, hard-core VK and ZL trackers took up the challenge.

The ingenuity of radio amateurs trackers has enabled this balloon flight to
be tracked without a working GPS.

He explained that using the Sun greyline at sunset and sunrise, antenna
bearing and wind prediction, the balloon position could be estimated.

PS-56 was tracked like this continuously for a week by Bob ZL1RS, before it
got to South America, and went out of range.

However by December 13 it popped up again on his waterfall, and tracking
resumed. Bob ZL2RS further narrowed the position down to between South
America and South Africa.

Fast forward to Saturday December 19, John VK2FAK and Joe VK5EI spotted
PS-56 with strong signal strength.

Then on last Sunday December 20 in the morning Bob ZL1RS he had the
position PS-56 based on the limited data available.

Andy VK3YT said: “Thanks to the efforts of trackers, it has been confirmed
as having circumnavigated the Southern Hemisphere, and is still flying.�

Earlier Andy VK3YT achieved a record distance flight with PS-46 that went
around the southern hemisphere twice, and leaving South Africa in storm on
July 18, 2015, was lost just short of its third circumnavigation.

Meantime its sister balloon PS-57 crossed over the equator on the morning
of December 24, is now in the northern hemisphere.

It travelled slowly but crossed north over the equator and at last report
was 9000m over Colombia, heading towards Venezuela.

Among the trackers following the norther hemisphere flight are ZL1RS,
AK4AT, VE1VDM/1, AK4AT, KC4RSN and K5XL. What will it do in the coming days
– wait and see.

* Jim Linton VK3PC*
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