APRS Floater Launch is Go… or not

Having completed the code for the APRS/RTTY Payload I got round to making a container and an antenna for it. The 70cms antenna was just going to be the normal 1/4 wave however the 2 meter one had to be slightly different. I settled on a Slim Jim made from twin core feeder wire. Using M0UKD’s Slim Jim Calculator I quickly made one up and made a choke out of some 40mm PVC tubing.

The estimates for battery life were a whopping 70 hours for each pair of AA’s in the payload (The operating battery voltage had to be > 3V or the efficiencies on the 5V stepup started to cause issues). In the end I decided on 3 pairs of AA energizers. Enough for continuous TX for about a week.


Here you can see the battery pack on the left and the transmitters on the right.
IMG_1143All fastened up note slim jim hanging below. Full build pics >here<

It was all ready to go, just plug in and launch then a spanner in the works. Apparently the operation of amateur radio equipment in the air isn’t permitted in France. Maybe. With the situation becoming unclear and the launch window rapidly approaching I made the decision not to launch the payload. Instead we’d launch a PAVA board with the same code on to test the Geofencing.

Leave a Comment

NOTE - You can use these HTML tags and attributes:
<a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <s> <strike> <strong>

Human test : * Time limit is exhausted. Please reload CAPTCHA.

This site uses Akismet to reduce spam. Learn how your comment data is processed.