Drone & antenne …
Alimentation filaire pour le drone
Balise 10Ghz
Transverter 47Ghz
LNA
Antennes paille
Archives annuelles : 2018
PicTalk software available
PicTalk software is available since morning, source code available here on GitHub,
Current version (as of 21st of Feb 2018) supports SDRPlay RSP1/A and RTLSDR. Funcube is not working properly (frequency management issue) and will be added soon.
This sotware requires Python 3.5 to be installed.
To compile this program you need to check that you have the correct Python installed, and in particular the following packages:
Required Qt Modules :
- qt5-default
- libqt5svg5-dev
- qtmultimedia5-dev
- libqt5opengl5-dev
Required librairies :
- libusb-1.0-0-dev
- libfftw3-dev
- libczmq-dev
- libhidapi-dev
Enjoy decoding 🙂
Credit: F4GKR, https://picsat.obspm.fr/, https://github.com/f4gkr/PicTalk
NAGOYA UT-106UV Test
Petit tour a F6KBF aujourd’hui, pour peaufiné un quart d’onde VHF, pour le mobile, j’en profite pour passer une NAGOYA UT-106UV a l’analyseur, vendu sur ebay aux alentour de 4€, pour ce prix, c’est une copie de la Nagoya Genuine
Sur embase magnétique, VHF/UHF, gain annoncé 2.15db, 3metres de cable RG174 sur entrée SMA.
Un passage étonnant sur analyseur DG8SAQ, nous montre une perf a -36db sur 145.500
Mesure réaliser (vhf uniquement) sur un large plan de masse, le toit de ma voiture.
Weekend project, do APRS with your KT8900 transceiver
This little cheap Chinese transceiver can be found on Ebay, or Aliexpress for 60$, supporting VHF/UHF, can Tx up to 25W. A complete description and testing page is available on G7EOB website
You plan to drive for a long way? broadcast your position on APRS Network, with some components you can build a small tracker. Arduino sketch is based from Trackuino, EA5HAV Javi
Trackuino is more intended to be used on ballon flights, but can work for APRS general purpose.
With some minor modifications, the tracker can send position depending of speed of the vehicle. Reading var gps_speed parser and set the APRS_PERIOD do the job.
Just bellow, is the schematic, D3 is used to generate the modulation, through the trimmer you can adjust the modulation level, D12 is used to saturate the transistor and do the PTT, GPS1 is GPS shield, but for my test i have used a old EM406. A0 is used to monitor the battery voltage with a resistor divider. 10k/3.3k, a temperature sensor LM60, is connected A1. All parameters, like callsign, Gps baudrate, pin assignation …. can be set into the config.h file
You need:
- Arduino Nano , or Mini, i prefer Nano because it’s powered @5v, so no need external level shifter for the GPS connection.
- GPS head, like EM406, or a GPS Board (Neo 7M) …
- A temperature sensor LM60 (option)
- Two resistors to monitor the battery voltage (option)
- 7805 voltage regulator with two tantalum capacitor
- A 2n2222 transistor to drive the PTT
- A 10K trimmer with a 1uf cap
- A short network RJ45 cable
- Wire, pin header, veroboard
Yes, i need a little nice box
27.05.2018
It’s more clean with a true pcb and a nice box.
Download file (pcb ARES file, Arduino sketch, shematic …)
Décoder les télémesures de Picsat sous Windows
Le satellite PICSAT lancé le 12 janvier 2018, émet des télémesures sur 435.525 MHz avec le protocole BPSK à 1200 bauds.
En attendant le logiciel PicTalk qui sera mis trés bientôt à disposition des amateurs et radioamateurs, il est possible de décoder et d’envoyer les télémesures en se basant sur la méthode suivante.