70cms filters - Revision history

M0YDH: RBP-440

2021-04-17T17:38:55Z

RBP-440

2021-03-17T21:14:06Z

2021-03-17T21:13:23Z

2017-09-19T18:37:51Z

Simple inter-digital filter

2017-04-02T16:50:13Z

2017-03-30T17:43:45Z

450MHz Lowpass Filter

2017-03-30T16:20:50Z

450MHz Lowpass Filter

2017-03-30T16:20:28Z

450MHz Lowpass Filter

2017-03-30T16:20:17Z

2017-03-26T17:30:35Z

Simple inter-digital filter

← Older revision		Revision as of 17:38, 17 April 2021
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	[[File:lpf7-450m-a-640x640.jpg\|200px]]		[[File:lpf7-450m-a-640x640.jpg\|200px]]
		+
		+	==Mini-Circuits RBP-440 Bandpass filter==
		+
		+	Mini-Circuits make an excellent low power Bandpass filter - the [https://www.minicircuits.com/WebStore/dashboard.html?model=RBP-440%2B RBP-440 ]which passes 410-470MHz signals and is for mounting on a PCB. Very low insertion loss. About £16 each or try your luck with an application to their EZ Samples programme.

	===Simple inter-digital filter===		===Simple inter-digital filter===

← Older revision		Revision as of 21:14, 17 March 2021
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−
−
−	*[http://www.dtx1.info/NewProducts.html Antennair] - suppliers of the DTX1

	DG0VE used to supply reasonably priced filters for most amateur bands, but passed away a few years ago.		DG0VE used to supply reasonably priced filters for most amateur bands, but passed away a few years ago.

← Older revision		Revision as of 21:13, 17 March 2021
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	*[http://www.dtx1.info/NewProducts.html Antennair] - suppliers of the DTX1		*[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	+	DG0VE used to supply reasonably priced filters for most amateur bands, but passed away a few years ago.

← Older revision		Revision as of 18:37, 19 September 2017
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	[[File:70cms 245 1.JPG\|400px]]		[[File:70cms 245 1.JPG\|400px]]

		+	Paul Wade W1GHZ has published [http://www.w1ghz.org/filter/Combline_Filters_for_VHF_and_UHF.pdf combline filter designs] in tinplate and Hammond boxes. THe 432MHz design uses a 1590BB size box. These are more easily tunable than the Altoids tin filter by using 3 air trimmer capacitors.

	===Tuneable pass band filter===		===Tuneable pass band filter===

@@ Line 25: / Line 25: @@
 The following suppliers sell built and tested units:
 *[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

@@ Line 1: / Line 1: @@
 There are plenty of designs available for 437 MHz filters:
-===450MHz Lowpass Filter===
+===450MHz Low pass transmit Filter===
 [http://www.minikits.com.au/electronic-kits/filter-kits/uhf-lowpass-filters/LPF7-450M Minikits in Australia] make a really good low pass filter which is ideal for use with the Portsdown or other 70cms DATV transmitters.

@@ Line 3: / Line 3: @@
 ===450MHz Lowpass Filter===
-[http://www.minikits.com.au/electronic-kits/filter-kits/uhf-lowpass-filters/LPF7-450M Minikits in Australia] make a really good low pass filter which is ideal for use with the Portsdown or other 70cms DATV transmitter.  As used by G4KLB, G8VPG and others.
+[http://www.minikits.com.au/electronic-kits/filter-kits/uhf-lowpass-filters/LPF7-450M Minikits in Australia] make a really good low pass filter which is ideal for use with the Portsdown or other 70cms DATV transmitters.
 [[File:lpf7-450m-a-640x640.jpg|200px]]

@@ Line 5: / Line 5: @@
 [http://www.minikits.com.au/electronic-kits/filter-kits/uhf-lowpass-filters/LPF7-450M Minikits in Australia] make a really good low pass filter which is ideal for use with the Portsdown or other 70cms DATV transmitter.  As used by G4KLB, G8VPG and others.
-[[File:lpf7-450m-a-640x640.jpg|400px]]
+[[File:lpf7-450m-a-640x640.jpg|200px]]
 ===Simple inter-digital filter===

← Older revision		Revision as of 16:20, 30 March 2017
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	There are plenty of designs available for 437 MHz filters:		There are plenty of designs available for 437 MHz filters:
		+
		+	===450MHz Lowpass Filter===
		+
		+	[http://www.minikits.com.au/electronic-kits/filter-kits/uhf-lowpass-filters/LPF7-450M Minikits in Australia] make a really good low pass filter which is ideal for use with the Portsdown or other 70cms DATV transmitter. As used by G4KLB, G8VPG and others.
		+
		+	[[File:lpf7-450m-a-640x640.jpg\|400px]]
		+
		+

	===Simple inter-digital filter===		===Simple inter-digital filter===

← Older revision		Revision as of 17:30, 26 March 2017
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	[[File:70cms 245 1.JPG\|400px]]		[[File:70cms 245 1.JPG\|400px]]

		+
		+	===Tuneable pass band filter===
		+
		+	Tuneable passband filter design by Ian, G3KKD, with 2 MHz band pass and 30 dB attenuation 4 MHz away. (the full article is available in CQ-TV 228).
		+
		+	[[File:70cms filter G3KKD.JPG\|400px]]

	===Built units===		===Built units===