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[aprssig] KC2TUA/KC2UFG Ballon QRM

Randy Farley rdfarley at fmtc.com
Sun Mar 22 15:06:59 UTC 2009


It could have been an honest mistake like turning the VFO nob on a
frequency agile  radio just before launch.
We had that happen once in a balloon club i belonged to. The frequency
used was 145.390. That happened to be one of our local club repeater
outputs. I  figured out what happened when i got phone calls from some
irate club members.

When i contacted the bashful culprit, they were very sorry. They could
not quite figure out why they had lost one of their redundant trackers
during that flight. :-)

Of course if a proper preflight check list is followed, such a mistake
should not happen. A lot goes on during a balloon flight preparation. It
was another one of those ham learning moments. No one died and the
repeater took no damage, so all was ok in the end.

Best choice is use a dedicated radio with only 144.390  programmed in it
or a single frequency unit.

I still accidently turn my memory vfo to 145.390 on my dual bander and
wonder why i see no one ;-)


Randy Farley
My QTH at:          http://map.findu.com/n7gps
Find Me Mobile at:  http://map.findu.com/n7gps-9

Ron wrote:
> For the past 2 hours, packet beacons from KC2UFG have been QRM'ing a repeater in NS by transmitting every minute on 146.400 mhz.
> This appears to be packet telemetry.
> KC2UFG>CQ [03/22/09  10:12:10] <UI R>:
> ÍÍs&ï©A€?oŸÿ|¹€€ÎƒŠð¶Á&@–@€àpr€ †€€€€€P=@€‘hÿD²@€p/Žÿ€†¢…€€Œ€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€À슓øà¡ïÿÿÿÿÿÿÿ
> KC2UFG>CQ [03/22/09  10:12:11] <UI R>:
> So why does a balloon transmit on a known and popular 2m voice channel?
> At 30,0000 ft its range is extreme...easily QRM'ing a 2m repeater 185 miles away.
> The APRS packet using KC2TUA-8 is at the same time on 144.390
> KC2TUA-8>APBL10,VE1TPL,WIDE1*,WIDE2-1 [03/22/09  10:32:33] <UI C>:
> !4306.69N/06300.26WO064/037/A=032592NS3 Air Vehicle
> Position of KC2TUA-8 --- 106.1 miles southeast of HALIFAX, NS --- Report received 5 seconds ago Course: 58.0 Speed: 46.0 MPH Altitude: 32474 feet
> Raw packet: KC2TUA-8>APBL10,VE1PKT,WIDE1,VE1TPL,WIDE2*,qAR,VE1AIC-1:!4317.84N/06231.84WO058/040/A=032474NS3 Air Vehicle
> This multi-hop path means every digipeater within 300 miles or more will be banging the network every minute.
> Come on guys, really...a packet every minute at 30,000 ft with mutli-hop path!!!!
> - VE1AIC Ron
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