Receiver Setup » History » Version 4
steve-m, 02/19/2016 10:50 PM
add FCD + helical antenna receiver setup
| 1 | 1 | laforge | = Receiver Setup = |
|---|---|---|---|
| 2 | |||
| 3 | 4 | steve-m | == !FunCube Dongle Pro + helical antenna == |
| 4 | 1 | laforge | |
| 5 | 4 | steve-m | This setup uses a !FunCube Dongle Pro along with a helical-antenna. Works fine without external LNA and the FCD gain set to 30dBm. |
| 6 | |||
| 7 | [[Image(fcd_gmr_helix.jpg, 50%)]] |
||
| 8 | |||
| 9 | 3 | horiz0n | |
| 10 | 1 | laforge | == USRP + WBX + helical antenna == |
| 11 | |||
| 12 | This setup works without any specific LNA, simply by using a USRP board with WBX front-end and a helical antenna |
||
| 13 | |||
| 14 | 2 | laforge | [[Image(gmr-helical-antenna.png)]] |
| 15 | 1 | laforge | |
| 16 | == USRP + WBX + LNA + offset dish antenna == |
||
| 17 | |||
| 18 | 3 | horiz0n | The signal chain looks as follows: |
| 19 | |||
| 20 | * 80cm offset dish |
||
| 21 | * selfmade RHCP feed (4 turns) |
||
| 22 | * LNA BB 1020 A from Kuhne electronic (>28dB gain, 0.8dB NF) |
||
| 23 | * L-Band dielectric filter |
||
| 24 | * WBX with GDB (gain setting at 20dB) |
||
| 25 | * USRP1 with standard clock |
||
| 26 | |||
| 27 | It is extremely helpful to observe the waterfall display while moving the dish. When adjusting for best reception, you have something like 10 degrees of margin in H and V direction. Gpredict has been used to evaluate Thuraya bearing with good results. |
||
| 28 | |||
| 29 | The antenna feed was built following the guidelines from http://www.uhf-satcom.com/lband/. Please note, that Thuraya uses LHC polarization, so the feed has to be RHCP because of the mirroring dish. |
||
| 30 | |||
| 31 | [[Image(offset_dish.jpg)]] |
