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1. [Amps] low pass filter fail ;) (score: 1): Author: Benedikt Sveinsson <benedikt@ok.is>; Date: Fri, 25 Apr 2014 21:49:47 +0000; I have been building a 2M SSPA - final part in the puzzle has been the low pass filter. After building this filter, copied the design from W6PQL - but I have limited resources here in TF land, so I d; /archives//html/Amps/2014-04/msg00221.html (7,136 bytes)
2. Re: [Amps] low pass filter fail ;) (score: 1): Author: Benedikt Sveinsson <benedikt@ok.is>; Date: Mon, 28 Apr 2014 00:21:52 +0000; well, here goes ;) I'm very close finishing my 2m amplifier that I'm going to use on EME here is a brief description of how I made the amplifier. http://www.tf3cy.is/1-2-kw-144-mhz-sspa (sorry for ba; /archives//html/Amps/2014-04/msg00235.html (8,577 bytes)
3. Re: [Amps] low pass filter fail ;) (score: 1): Author: Bill Turner <dezrat1242@wildblue.net>; Date: Sun, 27 Apr 2014 21:47:57 -0700; ORIGINAL MESSAGE: (may be snipped) REPLY: I wonder if the problem with the filter overheating might be that the cutoff frequency is too close to the operating frequency? That's just a guess - I have; /archives//html/Amps/2014-04/msg00236.html (7,652 bytes)
4. Re: [Amps] low pass filter fail ;) (score: 1): Author: peter chadwick <g8on@fsmail.net>; Date: Mon, 28 Apr 2014 08:32:04 +0200; With a VSWR of only 1.2:1, I wouldn't have thought it was too close to the cut off frequency. Passive LC filters (other than the absorptive types) work by having a high VSWR in the stop-band. Accordi; /archives//html/Amps/2014-04/msg00237.html (8,621 bytes)
5. [Amps] low pass filter fail ;) (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Mon, 28 Apr 2014 14:33:36 -0700; With a VSWR of only 1.2:1, I wouldn't have thought it was too close to the cut off frequency. Passive LC filters (other than the absorptive types) work by having a high VSWR in the stop-band. Accordi; /archives//html/Amps/2014-04/msg00238.html (8,337 bytes)
6. Re: [Amps] low pass filter fail ;) (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Mon, 28 Apr 2014 19:34:10 -0400; The most common cause Ive seen for filter problems is choosing the wrong cap for the job such as one designed for industrial service and not RF. I still see people using 60's TV doorknobs of 500pf 30; /archives//html/Amps/2014-04/msg00239.html (10,479 bytes)
7. Re: [Amps] low pass filter fail ;) (score: 1): Author: Tom Thompson <tlthompson@qwest.net>; Date: Mon, 28 Apr 2014 21:33:54 -0600; If you model the filter in LTSpice, you can look at all the voltages and currents and see if the capacitors are up to the task. Tom W0IVJ Jims comment about parallel caps is also valid; my 3CX1000A7; /archives//html/Amps/2014-04/msg00240.html (11,110 bytes)
8. Re: [Amps] low pass filter fail ;) (score: 1): Author: "ZL2AAA" <zl2aaa@nowmail.co.nz>; Date: Tue, 29 Apr 2014 18:19:02 +1200; Having made a good number of low pass filters some with disastrous results the biggest problem appears to be able to get reliable current ratings of the cap !Morrie If you model the filter in LTSpice; /archives//html/Amps/2014-04/msg00243.html (12,655 bytes)

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