8-Band RF Output Switch - Revision history

G4KLB: Added schematic

2026-03-23T14:21:35Z

Added schematic

2022-06-10T23:15:58Z

If I manage to upload it, the latest parts list will now cover version 3.0

2021-10-21T11:35:24Z

Lime SDR

2021-10-21T11:35:09Z

Version 2.2 PCBs

2021-10-20T13:13:15Z

Version 3 PCB - October 2021

2021-10-20T13:11:51Z

2021-10-20T10:08:26Z

2021-07-02T10:17:15Z

Version 2.2 PCBs

2021-07-02T10:16:56Z

Usage and Performance

2021-07-02T10:16:33Z

Lime SDR

← Older revision		Revision as of 14:21, 23 March 2026
Line 8:		Line 8:

	The latest parts list is here [[:File:8_BAND_RF_SWITCH_V3.0_PARTS.xls]].		The latest parts list is here [[:File:8_BAND_RF_SWITCH_V3.0_PARTS.xls]].
		+
		+	Schematic is here [[:File:8 Band RF Switch V3-0.pdf]]

	===Version 3 PCB - October 2021===		===Version 3 PCB - October 2021===

@@ Line 6: / Line 6: @@
 PCBs and the control PIC are available from the BATC Shop.
 ===Version 3 PCB - October 2021===
@@ Line 14: / Line 16: @@
 [[File:8 way switch v3.JPG|400px]]
 [[File:8 way switch v3 circuit.JPG|400px]]
@@ Line 21: / Line 22: @@
 The circuit for Version 2.1 and 2.2 PCBs is here: [[Media:8 BAND RF SWITCH V2-1 SCH.pdf]].
+Note that the value of C13 should be increased to 2.2 uF to prevent the 5V regulator from oscillating.
 ===Version 2.1 PCBs===

@@ Line 32: / Line 32: @@
 [[File:V2.1 Rework.JPG|240px]]
-===Lime SDR===
+====Lime SDR====
 When used with the Lime SDR, Dave G8GKQ recommended changes to the input attenutor in his article in CQ-TV 262 to improve performance at 2.4GHz. C16 changes to 1pF and R5 becomes a Zero Ohms link.  The modification is shown here on a prototype PCB with the 1pf capacitor on the white square.

@@ Line 19: / Line 19: @@
 ===Version 2.2 PCBs===
 The circuit for Version 2.1 and 2.2 PCBs is here: [[Media:8 BAND RF SWITCH V2-1 SCH.pdf]].
 The latest parts list is here [[:File:8_BAND_RF_SWITCH_V2.2a_PARTS.xls]].  This list is corrected to increase the value of C13 to 2.2 uf to prevent the 5v regulator oscillating.
 ===Version 2.1 PCBs===

← Older revision		Revision as of 13:13, 20 October 2021
Line 16:		Line 16:


−		+	[[File:8 way switch v3 circuit.JPG\|400px]]
−

	===Version 2.2 PCBs===		===Version 2.2 PCBs===

← Older revision		Revision as of 10:17, 2 July 2021
Line 14:		Line 14:

	The latest parts list is here [[:File:8_BAND_RF_SWITCH_V2.2a_PARTS.xls]]. This list is corrected to increase the value of C13 to 2.2 uf to prevent the 5v regulator oscillating.		The latest parts list is here [[:File:8_BAND_RF_SWITCH_V2.2a_PARTS.xls]]. This list is corrected to increase the value of C13 to 2.2 uf to prevent the 5v regulator oscillating.
		+
		+	===Usage and Performance===
		+
		+	The 8-way switch is intended to be used in association with the digital attenuator described here https://wiki.batc.org.uk/Output_Attenuator .
		+
		+	Typical system output levels with the digital attenuator connected to the output of the filter modulator board, and followed by the 8-way switch are shown below. Output levels and shoulder levels with the attenuator set to 0 dB and 3 dB are included.
		+
		+	{\| class="wikitable"
		+	\|-
		+	! Freq !! Level @0dB Atten !! Shoulders !! Level @-3dB !! Shoulders
		+	\|-
		+	\| 71 \|\| +10 dBm \|\| -45 dB \|\| +7 dBm \|\| -50 dB
		+	\|-
		+	\| 146 \|\| +12 dBm \|\| -45 dB \|\| +9 dBm \|\| -50 dB
		+	\|-
		+	\| 437 \|\| +14.5 dBm \|\| -45 dB \|\| +11.5 dBm \|\| -50 dB
		+	\|-
		+	\| 1255 \|\| +11 dBm \|\| -45 dB \|\| +8 dBm \|\| -45 dB
		+	\|}

	===Version 2.1 PCBs===		===Version 2.1 PCBs===

← Older revision		Revision as of 10:16, 2 July 2021
Line 51:		Line 51:

	[[File:8-Way RF Prototype Small.jpg\|556px]]		[[File:8-Way RF Prototype Small.jpg\|556px]]
−
−	~~===Usage and Performance===~~
−
−	~~The 8-way switch is intended to be used in association with the digital attenuator described here https://wiki.batc.org.uk/Output_Attenuator .~~
−
−	Typical system output levels with the digital attenuator connected to the output of the filter modulator board, and followed by the 8-way switch are shown below. Output levels and shoulder levels with the attenuator set to 0 dB and 3 dB are included.
−
−	~~{\| class="wikitable"~~
−	\|-
−	~~! Freq !! Level @0dB Atten !! Shoulders !! Level @-3dB !! Shoulders~~
−	\|-
−	~~\| 71 \|\| +10 dBm \|\| -45 dB \|\| +7 dBm \|\| -50 dB~~
−	\|-
−	~~\| 146 \|\| +12 dBm \|\| -45 dB \|\| +9 dBm \|\| -50 dB~~
−	\|-
−	~~\| 437 \|\| +14.5 dBm \|\| -45 dB \|\| +11.5 dBm \|\| -50 dB~~
−	\|-
−	~~\| 1255 \|\| +11 dBm \|\| -45 dB \|\| +8 dBm \|\| -45 dB~~
−	\|}

@@ Line 33: / Line 33: @@
 Here is a V2.3 PCB for LimeSDR Mini use, and the underside showing the wire link. Assembled by David M0YDH
-[[File:20190201 182759-1008x756.jpg|480px]]      [[File:20190201 182818-1008x756.jpg|480px]]
+[[File:20190201 182759-1008x756.jpg|400px]]      [[File:20190201 182818-1008x756.jpg|480px]]
 ===Version 1 PCBs===