2-Way RF Switch - Revision history

G8GTZ at 10:22, 2 July 2021

2021-07-02T10:22:47Z

2019-04-17T15:43:08Z

Parts List

2019-04-17T15:41:49Z

Schematic

2019-04-17T13:50:24Z

Self-build version using a Coaxial Relay

2019-04-17T13:49:51Z

2019-04-17T13:49:04Z

Self-build version using a Coaxial Relay

2019-04-17T13:43:34Z

Schematic

2019-04-17T13:39:16Z

2019-04-17T13:30:25Z

2019-04-17T13:29:36Z

← Older revision		Revision as of 10:22, 2 July 2021
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−	The 2-way RF switch ~~is a new addition to the Portsdown system. It allows~~ a single PA (or the 4-way or 8-way RF switch) to be driven from either the Portsdown Filter-modulator board or the LimeSDR without reconfiguration. So, it is intended as 2 inputs, one output, rather than the single input, multiple outputs of the 4-way and 8-way switches.	+	The 2-way RF switch enables a single PA (or the 4-way or 8-way RF switch) to be driven from either the Portsdown Filter-modulator board or the LimeSDR without reconfiguration. So, it is intended as 2 inputs, one output, rather than the single input, multiple outputs of the 4-way and 8-way switches.

	This block diagram shows a comprehensive arrangement with all the features. Many of the blocks are optional – it depends on your requirements.		This block diagram shows a comprehensive arrangement with all the features. Many of the blocks are optional – it depends on your requirements.

@@ Line 17: / Line 17: @@
 ===Parts List===
-The parts list can be found here [[:File:2-Way RF Switch V1-0 parts.xls]].  Note that there are a number of configurations listed in the parts list, either using screw terminals or Molex connectors.  Also the RF switching IC can be substituted with a relay.  The photo above shows the use of Molex connectors together wiuth and RF switching IC.
+The parts list can be found here [[:File:2-Way RF Switch V1-0 parts.xls]].  Note that there are a number of configurations listed in the parts list, either using screw terminals or Molex connectors.  Also the RF switching IC can be substituted with a relay.  The photo above shows the use of Molex connectors together with an RF switching IC.  The SMA connectors are vertical mount in the photo above, end-launch SMAs can also be used.
 ===Test results===

← Older revision		Revision as of 15:41, 17 April 2019
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	[[File:2 Way switch Circuit.png\|914px]]		[[File:2 Way switch Circuit.png\|914px]]
		+
		+	===Parts List===
		+
		+	The parts list can be found here [[:File:2-Way RF Switch V1-0 parts.xls]]. Note that there are a number of configurations listed in the parts list, either using screw terminals or Molex connectors. Also the RF switching IC can be substituted with a relay. The photo above shows the use of Molex connectors together wiuth and RF switching IC.

	===Test results===		===Test results===

@@ Line 40: / Line 40: @@
 ===Self-build version using a Coaxial Relay===
-John, our hardware designer, has provided this suggested circuit for a self-build version (dead-bug or veroboard) using a coaxial relay:
+John, our hardware designer, has also provided this suggested circuit for a self-build version (dead-bug or veroboard) using a coaxial relay:
 [[File:Simple RF Switch.jpg|498px]]

@@ Line 2: / Line 2: @@
 This block diagram shows a comprehensive arrangement with all the features.  Many of the blocks are optional – it depends on your requirements.
 [[File:Output Switching.JPG|612px]]
 The 2-way switch decodes the signals sent on the symbol rate switching lines (detecting all 3 high, which was previously unused) and selects the LimeSDR output, rather than the Filter-modulator board, when required.

@@ Line 11: / Line 11: @@
 ===Schematic===
-[[File:2 Way switch Circuit.jpg|800px]]
+[[File:2 Way switch Circuit.png|914px]]
 ===Test results===

@@ Line 31: / Line 31: @@
 | 2405 MHz || 3.5dB || 19dB
 |}
 The insertion loss at 2405 MHz can be reduced by 0.5 dB by trimming the centre pins of the SMA connectors to be flush with the underside of the PCB.  A further improvement could probably be made by trimming the RF tracks on the top of the PCB so that they do not extend beyond the SMA centre pin.
 The PCB for the RF switch is available from the BATC shop.

@@ Line 5: / Line 5: @@
 [[File:Output Switching.JPG|612px]]
-The 2-way switch decodes the signals sent on the symbol rate switching lines (detecting all 3 high, which was previously unused) and selects the LimeSDR output, rather than the Filter-modulator board when required.
+The 2-way switch decodes the signals sent on the symbol rate switching lines (detecting all 3 high, which was previously unused) and selects the LimeSDR output, rather than the Filter-modulator board, when required.
 [[File:2 Way Switch.jpg|400px]]