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Article #2215Re: HV protection for receiver input?
From: Roger Johansson
Date: Sun, 10 Aug 2003 16:47
Date: Sun, 10 Aug 2003 16:47
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2604 bytes
Paul Burridge <redscar@waitrose.notformail.com> wrote: >>And the inductor is used how? In series it will block the RF. In parallel, >>it will still look like a high impedance for the fast rise time spike of >>a zap. > >Good point, Sam. So what's the definitive answer? Anti-parallell diodes are a good answer, but there has to be something before it to limit the current. Maybe an impedance-corrected pad, or a series resonant circuit, an antenna transformer.. I have seen schemes for switching antennas for radio amateurs, between different bands, between receiving and transmitting.. They give the diodes a forward voltage to turn it on or a back voltage to turn it off (low capacitance). There has to be some useful tricks these radio amateurs use because they don't seem to have problems with broken diodes. It just needs some more consideration than just putting two diodes directly at the input. -- Roger J.
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X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: 112d1e,5731ee67b7a682a6 X-Google-Attributes: gid112d1e,public X-Google-Thread: 10d137,5731ee67b7a682a6 X-Google-Attributes: gid10d137,public X-Google-Thread: 1131b0,5731ee67b7a682a6 X-Google-Attributes: gid1131b0,public X-Google-Thread: 103407,5731ee67b7a682a6 X-Google-Attributes: gid103407,public X-Google-ArrivalTime: 2003-08-10 09:48:25 PST Path: arc1-ca.pugleaf.net!archiver1.google.com!news1.google.com!newsfeed.stanford.edu!headwall.stanford.edu!fu-berlin.de!uni-berlin.de!dialup-d2i-62-65-93-128.home.SE!not-for-mail From: Roger Johansson <no-email@home.se> Newsgroups: sci.electronics.design,alt.engineering.electrical,sci.electronics.repair,aus.electronics Subject: Re: HV protection for receiver input? Date: Sun, 10 Aug 2003 18:47:04 +0200 Organization: Utopia Lines: 29 Message-ID: <lktcjv4mtpfdvh04ivnpc61o9sjvc7t564@4ax.com> References: <0001HW.BB56508400106C52F0386600@news.individual.net> <bgr1dh$2m7$1@news.eusc.inter.net> <bgr65s$siv$3@blue.rahul.net> <4a7a3b7a1b561e37c5ee768af015fb55@free.teranews.com> <6wispanzgs.fsf@saul.cis.upenn.edu> <fe797f443eac5056732e1ab8efda6820@free.teranews.com> <6wsmoemeeu.fsf@saul.cis.upenn.edu> <bh4575$u4a$1@slb9.atl.mindspring.net> <MPG.199fe94553edab74989ba2@news.inreach.net> <6wadah7hpf.fsf@saul.cis.upenn.edu> <b5ncjvgq4sssd59enmkmt7kmejqukddb41@4ax.com> NNTP-Posting-Host: dialup-d2i-62-65-93-128.home.se (62.65.93.128) Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Trace: news.uni-berlin.de 1060534103 32252930 62.65.93.128 (16 [86336]) X-Newsreader: Forte Agent 1.92/32.572