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## Re: [Amps] Checking Plate Choke resonance

 To: amps@contesting.com Re: [Amps] Checking Plate Choke resonance Larry Benko Tue, 13 Oct 2009 19:37:27 -0600 mailto:amps@contesting.com>
 ```Let me add a little insight here. I believe everyone agrees that a series resonance would be disastrous for a plate choke. However for a parallel resonance there are 2 distinct cases. Case #1: Just below the parallel resonance Xl is very high such as +j10,000 and Xc is also very high such as -j11,000. At a slightly higher frequency the parallel resonance has a combined extremely high impedance and very small circulating current. Case #2: Just below the parallel resonance Xl is very low such as +j100 and Xc is also very low such as -j110. At a slightly higher frequency the parallel resonance has a combined extremely high impedance but a very high circulating current. While both cases might mathematically work Case #1 is what we are talking about for a plate choke. Case #2 might make sense with medium value impedances for the plate choke if wanted to increase the impedance for a specific small frequency range such as 160m. Larry, W0QE Carl wrote: > Yep, the principle works from power supplies, audio and RF. > > I believe Bill is the one confused. > > Carl > KM1H > > > ----- Original Message ----- > From: "Jeff Blaine AC0C" > To: ; > Sent: Tuesday, October 13, 2009 9:07 PM > Subject: Re: [Amps] Checking Plate Choke resonance > > > >> Hi Bill, >> >> I am a bit confused on this. >> >> It's been a while - but I was thinking that I read one time on RM's site >> about creating an intentional parallel resonance on the filament choke. >> That's a different part, but it seems the principle would be the same. >> >> 73/jeff/ac0c >> >> -------------------------------------------------- >> From: "Bill, W6WRT" >> Sent: Tuesday, October 13, 2009 11:03 AM >> To: >> Subject: Re: [Amps] Checking Plate Choke resonance >> >> >>> ORIGINAL MESSAGE: >>> >>> On Mon, 12 Oct 2009 23:17:39 -0700, "Hardy Landskov" >>> wrote: >>> >>> >>>> Sweep >>>> the frequency range you want to use and watch for series resonances. >>>> >>> REPLY: >>> >>> Watch for parallel resonances too. Either one will smoke the choke if >>> they >>> are >>> in or near a ham band. >>> >>> 73, Bill W6WRT >>> _______________________________________________ >>> Amps mailing list >>> Amps@contesting.com >>> http://lists.contesting.com/mailman/listinfo/amps >>> >>> > _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps ```
 Current Thread Re: [Amps] Checking Plate Choke resonance, (continued) Re: [Amps] Checking Plate Choke resonance, Jim Tonne Re: [Amps] Checking Plate Choke resonance, Vic K2VCO Re: [Amps] Checking Plate Choke resonance, Gary Schafer Re: [Amps] Checking Plate Choke resonance, Bill, W6WRT Re: [Amps] Checking Plate Choke resonance, Carl Re: [Amps] Checking Plate Choke resonance, DF3KV Re: [Amps] Checking Plate Choke resonance, Bill, W6WRT Re: [Amps] Checking Plate Choke resonance, Gary Schafer Re: [Amps] Checking Plate Choke resonance, Jeff Blaine AC0C Re: [Amps] Checking Plate Choke resonance, Carl Re: [Amps] Checking Plate Choke resonance, Larry Benko <= Re: [Amps] Checking Plate Choke resonance, Bill, W6WRT Re: [Amps] Checking Plate Choke resonance, Larry Benko Re: [Amps] Checking Plate Choke resonance, Bill, W6WRT Re: [Amps] Checking Plate Choke resonance, Larry Benko Re: [Amps] Checking Plate Choke resonance, Bill, W6WRT