23cms filters - Revision history

M0YDH: /* 3 and 5 pole filters */ brass screws

2021-06-26T11:55:09Z

3 and 5 pole filters: brass screws

M0YDH: /* 3 and 5 pole filters */

2021-06-20T14:00:50Z

3 and 5 pole filters

M0YDH: /* 3 and 5 pole filters */

2021-06-20T13:58:39Z

3 and 5 pole filters

M0YDH: /* 3 and 5 pole filters */

2021-06-20T13:50:01Z

3 and 5 pole filters

M0YDH: /* 3 and 5 pole filters */

2021-06-20T13:49:44Z

3 and 5 pole filters

M0YDH: 5 pole filter

2021-06-20T13:47:25Z

5 pole filter

M0YDH: DB6NT LPF

2018-05-07T19:19:22Z

DB6NT LPF

M0YDH: DB6NT PCB 58 low pass filter

2018-05-07T19:11:30Z

DB6NT PCB 58 low pass filter

M0YDH: add photo of my version of BPF

2017-12-05T17:04:27Z

add photo of my version of BPF

G4FRE at 14:26, 8 October 2017

2017-10-08T14:26:57Z

@@ Line 23: / Line 23: @@
 http://www.w6pql.com/23cm_filters.htm
-Pictures of the 5 pole version made by David M0YDH. Cables and coupler only measured at -9.75dBm indicating an inserion loss of 2.3dBm for the filter. Wire loops are 12mm long. Blutak and a 1mm thick washer were very helpful during assembly soldering for positioning the loops. Poles are 50mm long and M4 screws were used. It is important to produce a good D hole for the connectors - in this case filing out a Ø5mm hole to get a snug, anti-rotation hole for the SMA connectors.  Filter centre was adjusted from 1296 to 1249 - 1255 MHz. The long brass screws affect the insertion loss by tenths of a dB - very fine tuning!
+Pictures of the 5 pole version made by David M0YDH. Cables and coupler only measured at -9.75dBm indicating an inserion loss of 2.3dBm for the filter. When the zinc plated steel screws were replaced by solid brass screws this reduced to a 1.7 dBm loss. Wire loops are 12mm long. Blutak and a 1mm thick washer were very helpful during assembly soldering for positioning the loops. Poles are 50mm long and M4 screws were used. It is important to produce a good D hole for the connectors - in this case filing out a Ø5mm hole to get a snug, anti-rotation hole for the SMA connectors.  Filter centre was adjusted from 1296 to 1249 - 1255 MHz. The long brass screws affect the insertion loss by tenths of a dB - very fine tuning! With all brass screws the two 25mm were peaked nearly fully inserted.
 [[File:1255 Interdigital filter 1.jpg|300px]] [[File:1255 Interdigital filter 2.jpg|300px]] [[File:1255 Interdigital filter 3.jpg|600px]]

@@ Line 23: / Line 23: @@
 http://www.w6pql.com/23cm_filters.htm
-Pictures of the 5 pole version made by David M0YDH. Cables and coupler measured at -9.75dBm indicating an inserion loss of 2.3dBm. Wire loops are 12mm long. Blutak and a 1mm thick washer were very helpful during assembly soldering for positioning the loops. Poles are 50mm long and M4 screws were used. It is important to produce a good D hole for the connectors - in this case filing out a Ø5mm hole to get a snug, anti-rotation hole for the SMA connectors.  Filter centre was adjusted from 1296 to 1249 - 1255 MHz
+Pictures of the 5 pole version made by David M0YDH. Cables and coupler only measured at -9.75dBm indicating an inserion loss of 2.3dBm for the filter. Wire loops are 12mm long. Blutak and a 1mm thick washer were very helpful during assembly soldering for positioning the loops. Poles are 50mm long and M4 screws were used. It is important to produce a good D hole for the connectors - in this case filing out a Ø5mm hole to get a snug, anti-rotation hole for the SMA connectors.  Filter centre was adjusted from 1296 to 1249 - 1255 MHz. The long brass screws affect the insertion loss by tenths of a dB - very fine tuning!
 [[File:1255 Interdigital filter 1.jpg|300px]] [[File:1255 Interdigital filter 2.jpg|300px]] [[File:1255 Interdigital filter 3.jpg|600px]]

@@ Line 23: / Line 23: @@
 http://www.w6pql.com/23cm_filters.htm
-Pictures of the 5 pole version made by David M0YDH. Cables and coupler measured at -9.75dBm indicating an inserion loss of 2.3dBm. Wire loops are 12mm long. Blutak and a 1mm thick washer were very helpful during assembly soldering for positioning the loops. Poles are 50mm long and M4 screws were used. Filter centre was adjusted from 1296 to 1249 - 1255 MHz
+Pictures of the 5 pole version made by David M0YDH. Cables and coupler measured at -9.75dBm indicating an inserion loss of 2.3dBm. Wire loops are 12mm long. Blutak and a 1mm thick washer were very helpful during assembly soldering for positioning the loops. Poles are 50mm long and M4 screws were used. It is important to produce a good D hole for the connectors - in this case filing out a Ø5mm hole to get a snug, anti-rotation hole for the SMA connectors.  Filter centre was adjusted from 1296 to 1249 - 1255 MHz
 [[File:1255 Interdigital filter 1.jpg|300px]] [[File:1255 Interdigital filter 2.jpg|300px]] [[File:1255 Interdigital filter 3.jpg|600px]]

@@ Line 25: / Line 25: @@
 Pictures of the 5 pole version made by David M0YDH. Cables and coupler measured at -9.75dBm indicating an inserion loss of 2.3dBm. Wire loops are 12mm long. Blutak and a 1mm thick washer were very helpful during assembly soldering for positioning the loops. Poles are 50mm long and M4 screws were used. Filter centre was adjusted from 1296 to 1249 - 1255 MHz
-[[File:1255 Interdigital filter 1.jpg|300px]] [[File:1255 Interdigital filter 2.jpg|300px]] [[File:1255 Interdigital filter 3.jpg|400px]]
+[[File:1255 Interdigital filter 1.jpg|300px]] [[File:1255 Interdigital filter 2.jpg|300px]] [[File:1255 Interdigital filter 3.jpg|600px]]
 ===Low Pass Filter===

@@ Line 25: / Line 25: @@
 Pictures of the 5 pole version made by David M0YDH. Cables and coupler measured at -9.75dBm indicating an inserion loss of 2.3dBm. Wire loops are 12mm long. Blutak and a 1mm thick washer were very helpful during assembly soldering for positioning the loops. Poles are 50mm long and M4 screws were used. Filter centre was adjusted from 1296 to 1249 - 1255 MHz
-[[File:1255 Interdigital filter 1.jpg|300px]] [[File:1255 Interdigital filter 2.jpg|300px]] [[File:1255 Interdigital filter 3.jpg|300px]]
+[[File:1255 Interdigital filter 1.jpg|300px]] [[File:1255 Interdigital filter 2.jpg|300px]] [[File:1255 Interdigital filter 3.jpg|400px]]
 ===Low Pass Filter===

@@ Line 9: / Line 9: @@
 https://wiki.batc.tv/images/a/ab/20171126_GM8OTI_BPF_23cm_%28Small%29.jpg
-Example made by M0YDH (using capacitors found in the Finningley ARS scrap heap during CAT17!). Thanks to John Cooke GM8OTI for the drawing where dimensions in blue are the result of scaling. Elements are brass rods Ø3mm x 19 long off inside face.
+Example made by M0YDH (using capacitors found in the Finningley ARS scrap heap during CAT17!). Thanks to John Cooke GM8OTI for the drawing where dimensions in blue are the result of scaling. Elements are brass rods Ø3mm x 19 long off inside face. Design is dependant on high quality capacitors. W6PQL filters may have lower insertion loss.
 ===Look through cavity filter for 23cms===
@@ Line 22: / Line 22: @@
 http://www.w6pql.com/23cm_filters.htm
 ===Low Pass Filter===
@@ Line 43: / Line 48: @@
 *[http://www.dtx1.info/NewProducts.html Antennair] - suppliers of the DTX1
-*[http://www.dg0ve.de/en/filter.htm DG0VE] - German supplier of reasonably priced filters for most amateur bands
+*[http://www.dg0ve.de/en/filter.htm DG0VE] - German supplier of reasonably priced filters for most amateur bands now sadly SK - company closed 2019
 *[http://aerial-parts.co.uk/epages/626ba059-121d-45c5-8692-ea58514eb29c.sf/en_GB/?ObjectPath=/Shops/626ba059-121d-45c5-8692-ea58514eb29c/Products/APP0003 Aerial-parts-uk] - 23cm Interdigital, Filter Response measured at the 2016 Martlesham Microwave Round table as follows:-
 [[File:Screen_20170408_154607.png|400px]]

@@ Line 26: / Line 26: @@
 [[File:DB6NT_23cm_low_pass_filter.jpg|300px]]
-Kuhne PCB 58 is a low pass filter and coupler rated up to 30W. [http://www.xeropage.co.uk/g3nyk/componen.htm This is available as a kit of PCB, tinplate box and SMA connectors from Alan Melia G3NYK.] It's priced £21.50 in 2018. This does not include discrete components for the coupler portion.
+Kuhne PCB 58 is a low pass filter and coupler rated up to 30W. [http://www.xeropage.co.uk/g3nyk/componen.htm This is available as a kit of PCB, tinplate box and SMA connectors from Alan Melia G3NYK.] 3/4 of the way down the page. It's priced £21.50 in 2018. This does not include discrete components for the coupler portion.
-[http://shop.kuhne-electronic.de/kuhne/en/shop/accessoires/pcbs/PCB+no++58++lowpass+23+cm+band/?card=331#accessories The PCB is originally shown here] which contains a PDF with full spec, schematic and colour photos.
+[http://shop.kuhne-electronic.de/kuhne/en/shop/accessoires/pcbs/PCB+no++58++lowpass+23+cm+band/?card=331#accessories The PCB is originally shown here]
-[http://shop.kuhne-electronic.de/module/mysydeshop/webforms/download_file.php?file=1671 Under downloads there is a Beschreibung / Descriptions link].
+[http://shop.kuhne-electronic.de/module/mysydeshop/webforms/download_file.php?file=1671 Under downloads there is a Beschreibung / Descriptions link] which contains a PDF with full spec, schematic and colour photos.
-[http://www.g4dbn.uk/?m=201609 Neil G4DBN has published test results for the filter and populated the coupler circuit.] NB the diode he chose is stripe marked at the ANODE end - when you use high magnification!
+[http://www.g4dbn.uk/?m=201609 Neil G4DBN has published test results for the filter and populated the coupler circuit.] NB the diode he chose is stripe marked at the ANODE end - when you use very high magnification!

← Older revision		Revision as of 19:11, 7 May 2018
Line 23:		Line 23:
	http://www.w6pql.com/23cm_filters.htm		http://www.w6pql.com/23cm_filters.htm

		+	===Low Pass Filter===
		+	[[File:DB6NT_23cm_low_pass_filter.jpg\|300px]]
		+
		+	Kuhne PCB 58 is a low pass filter and coupler rated up to 30W. [http://www.xeropage.co.uk/g3nyk/componen.htm This is available as a kit of PCB, tinplate box and SMA connectors from Alan Melia G3NYK.] It's priced £21.50 in 2018. This does not include discrete components for the coupler portion.
		+
		+	[http://shop.kuhne-electronic.de/kuhne/en/shop/accessoires/pcbs/PCB+no++58++lowpass+23+cm+band/?card=331#accessories The PCB is originally shown here] which contains a PDF with full spec, schematic and colour photos.
		+
		+	[http://shop.kuhne-electronic.de/module/mysydeshop/webforms/download_file.php?file=1671 Under downloads there is a Beschreibung / Descriptions link].
		+
		+	[http://www.g4dbn.uk/?m=201609 Neil G4DBN has published test results for the filter and populated the coupler circuit.] NB the diode he chose is stripe marked at the ANODE end - when you use high magnification!
		+
		+
		+

	===Manufacturers===		===Manufacturers===

@@ Line 5: / Line 5: @@
 A nice simple to construct design by GM8OTI
 http://www.marwynandjohn.org.uk/GM8OTI/proj23cmBPF/proj23cmBPF.html
 ===Look through cavity filter for 23cms===