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--- feed_measurements [2018/05/10 17:53] – [8MHz comb RFI] jrseti
+++ feed_measurements [2023/10/28 18:36] (current) – external edit 127.0.0.1
@@ Line 1: / Line 1: @@
-====Feed Measurements====
+=====Feed Testing=====
+June 05, 2018 - received the mini circuits attenuator and 8 port RF switch. Two of each.
+{{:rf-switch-and-attenuator.jpg|}}
+Note: That is a quarter coin in the center for size reference.
+Plugged into VM server ngs-work1 (sonata@10.1.49.174, polaris)
+  - Attenuator RUDAT-6000-30: https://www.minicircuits.com/WebStore/dashboard.html?model=RUDAT-6000-30
+  - RF Switch USB-1SP8T-63H: https://www.minicircuits.com/WebStore/dashboard.html?model=USB-1SP8T-63H
+Created 2 programs, rfswitch and atten to control these units over USB. See https://github.com/jrseti/ATARFSwitchUtils for a full explanation and the source code.
+**Setting up Proxmox USB ports**
+  root@nsg-headnode:~# qm monitor 101
+  qm> info usbhost
+    Bus 3, Addr 5, Port 14.1, Speed 1.5 Mb/s
+      Class 00: USB device 0557:2419
+    Bus 3, Addr 8, Port 12.4.4, Speed 12 Mb/s
+      Class 00: USB device 20ce:0023, Mini-Circuits
+    Bus 3, Addr 7, Port 12.4.2, Speed 12 Mb/s
+      Class 00: USB device 20ce:0022, Mini-Circuits
+    Bus 3, Addr 10, Port 12.4.1.3, Speed 12 Mb/s
+      Class 00: USB device 20ce:0022, Mini-Circuits
+    Bus 3, Addr 9, Port 12.4.1.1, Speed 12 Mb/s
+      Class 00: USB device 20ce:0023, Mini-Circuits
+Note the port numbers (like Port 12.4.4)
+In Proxmox, assign the usb ports as shown:
+{{:usb-proxmox.png|}}
+The head node needs to be rebooted to make the USB changes work.
+The RF switch and attenuator units are installed at the top of the FXA Rack just to the right of the RFCB rack:
+{{:rfswitch-location.jpg|}}
+=====Feed Measurements - May 09, 2018 =====
 Various feed measurements using the spectrum analyzer. Using feed 4jx. **May 09, 2018**
@@ Line 20: / Line 63: @@
 For reference, here is the original RFCB drawing I found:
 {{ :rfcb-diagram-original.png?400 |}}
+=====CasA=====
+CasA at 1420, looks like it always does:
+{{ :4jx-casa-h1.png?400 |}}
 =====W3OH=====
@@ Line 42: / Line 91: @@
 On feed 3Lx it was very strong, this is a 120MHz badwidth shot:
-{{ :3l-rfi-every_8mhz.png?600 |}}
+{{ :3l-rfi-every_8mhz.png?400 |}}