Re: KF4ZTI 11 latex floater now over Tulsa OK


Bill Brown
 

Update on the KF4ZTI-11 latex floater. Thanks to Harry KC5TRB in Tulsa OK for dusting off his APRS setup and establishing an iGate tuned to the higher frequency. It is now directly over his house in Tulsa OK having floating all night bouncing between 92,000 and 95,000 feet and is now back at 108,000 feet now that the Sun is heating it up again. The battery pack went out an hour before sunrise but came back now that the bubble-wrap insulation is allowing the payload to reach temperatures over 20 degrees C. It was -45 deg C most of the night. (Eveready AAA lithiums 4-pack). Now that the internal temp is over 20 C, the frequency has drifted back to around 144.342 and 144.392 MHz so should work with digipeaters and iGates again.

Should be heard from Omaha to Houston now and all over OK, AR, KS and MO.

Now it is just a matter of time to see how long it can survive the UV radiation.

- Bill WB8ELK


-----Original Message-----
From: Bill Brown via groups.io <wb8elk@...>
To: GPSL@groups.io <GPSL@groups.io>
Sent: Sat, Jun 13, 2020 10:45 pm
Subject: Re: [GPSL] KF4ZTI11 latex floater heading across Arkansas tonight

Update on the KF4ZTI-11 latex floater. After sunset it dropped from 108000 feet (where it spent most of the day) down to 92000 feet where it has leveled off. APRS frequencies now have settled down to 144.351 MHz and 144.401 MHz. I'm still decoding it on 144.351 MHz from 255 miles away as it travels west across Arkansas tonight. Harry KC5TRB is hearing it now in Tulsa and getting partial decodes on APRS.  Mike W0MB in Kansas City can hear it weakly but doesn't have a way to decode the APRS packets. At the current rate of speed and westerly heading it will likely be in Oklahoma by sunrise tomorrow.

- Bill WB8ELK


-----Original Message-----
From: Bill Brown via groups.io <wb8elk@...>
To: gpsl@groups.io <gpsl@groups.io>
Sent: Sat, Jun 13, 2020 9:23 pm
Subject: [GPSL] KF4ZTI11 latex floater heading across Arkansas tonight

KF4ZTI-11 was launched this morning (Saturday) from Clarksville TN with just one pound of payload attached. GoPro type camera and an APRS tracker. It transmits every 1 minute on 144.39 and then 10 seconds later on 144.34 MHz...This payload sat in a tree for a week or two last year and saw quite a bit of weather. As a result the transmit frequency has shifted to 144.348 MHz on APRS as well as 144.398 MHz when it gets below -20 C...As a result it is out of the passband for most digipeaters. I am still copying it here in Huntsville AL from 220 miles out but is about out of range for me. Is there someone in the St. Louis, Kansas City, Little Rock, Memphis or east OK or NE TX that can set up an iGate tuned to 144.348 MHz tonight? If you already have an iGate, can you tune it to 144.398 or 144.348 MHz? This is an unplanned latex floater due to KF4ZTI putting in only a few ounces of positive lift on a 1200 gram balloon. It floated all day around 107000 feet but is descending after sunset...probably will level out around 90,000 feet and continue on west across Arkansas tonight.

- Bill WB8ELK


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