Unterschiede

Hier werden die Unterschiede zwischen zwei Versionen angezeigt.

--- projekte:3cmbeacon:start [2023/01/06 18:25] – [Integrated 10 GHz Beacon Transmitter] thasti
+++ projekte:3cmbeacon:start [2023/01/06 18:30] – thasti
@@ Zeile 8: / Zeile 8: @@
   * **[[https://git.loetlabor-jena.de/10g_beacon/10g_beacon_sw_v2|Software repository, Rev 2 (Gitlab)]]**
   * **[[https://git.loetlabor-jena.de/10g_beacon/10g_beacon_sw|Software repository, Rev 1 (Gitlab, obsolete)]]**
-{{:projekte:3cmbeacon:pcb_v1_small.jpeg?400 |}} {{ :projekte:3cmbeacon:pcb_v2_small.jpeg?400|}}
 ===== Architecture =====
+{{ :projekte:3cmbeacon:odu_tx_ref.jpg?500|Fully assembled transmitter PCB on temporary heat sink}}
 A simple block diagram of the beacon transmitter is shown in the figure below.
@@ Zeile 23: / Zeile 23: @@
 ===== RF Design =====
+{{ :projekte:3cmbeacon:pcb_v1_small.jpeg?425|}}\\
 One of the key design features that helps with driving down cost is working with a commercial four-layer FR4 stackup. These have become ubiquitous and cheap to use, so one supplier (JLCPCB from China) was chosen and their PCB process characterized for RF performance. Two dedicated RF test coupons were designed: Based on the results of long simulations, prototype designs for SMA connector footprints, microstrip, coplanar waveguides etc were designed.
@@ Zeile 67: / Zeile 69: @@
 ===== Testing =====
+{{ :projekte:3cmbeacon:pcb_v2_small.jpeg?400|}}
 Before going into continuous operation at DB0HDF, the transmitter hard- and software were extensively tested on the lab workbench. The output power, phase noise and spurious performance was first evaluated, with a particular emphasis on varying input voltage conditions. Long supply wires could possibly cause regulator instabilities in final installations, and (resistive) voltage drop could across the cable could cause unexpected input voltage conditions.
@@ Zeile 88: / Zeile 92: @@
 ===== Transmitter Integration at DB0HDF =====
 With the PCB battle-tested, the beacon needed to be assembled in a setup suitable for extended outdoor installation. A small add-on PCB allows supplying power and serial data through a common Cat.5 Ethernet cable with RJ-45 connectors. On the receiving end, a Raspberry Pi shield was designed that houses a relay for power control and RS-422 level conversion for the on-board serial port.
-{{:projekte:3cmbeacon:odu_tx_ref.jpg?600|Fully assembled transmitter PCB on temporary heat sink}}
 {{:projekte:3cmbeacon:idu_shield_ref.jpg?600|Raspberry Pi Shield}}