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1. [Amps] RF choke switching (score: 1): Author: Vic K2VCO <vic@rakefet.com>; Date: Thu, 09 Jun 2011 17:43:39 -0700; I'm planning another amplifier (2 x 4-400A, 1.8-28 mHz) and I was thinking that I would deal with the "RF choke problem" by having two chokes in series. The one nearest the plates will have enough in; /archives//html/Amps/2011-06/msg00115.html (7,003 bytes)
2. Re: [Amps] RF choke switching (score: 1): Author: Eddy Swynar <deswynar@xplornet.ca>; Date: Thu, 9 Jun 2011 22:10:44 -0400; Hi Vic, For some time now I've mulling over a very similar set-up here...only in my instance, I was thinking of somehow shorting the bigger inductor whenever I wanted to use the higher frequency band; /archives//html/Amps/2011-06/msg00116.html (9,359 bytes)
3. Re: [Amps] RF choke switching (score: 1): Author: Angel Vilaseca <avilaseca@bluewin.ch>; Date: Fri, 10 Jun 2011 08:12:29 +0200; Vic, Why not use the vacuum relay to short the big choke? That is what is done on the tank circuit when bandswitchig. 73 de HB9SLV Vic K2VCO a écrit : _______________________________________________; /archives//html/Amps/2011-06/msg00126.html (7,837 bytes)
4. Re: [Amps] RF choke switching (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Fri, 10 Jun 2011 08:04:14 -0400; The Henry 8K uses 2 chokes and so do several commercial 2-30MHz amps. Some switch, some dont. Carl KM1H _______________________________________________ Amps mailing list Amps@contesting.com http://li; /archives//html/Amps/2011-06/msg00129.html (10,873 bytes)
5. Re: [Amps] RF choke switching (score: 1): Author: Larry Benko <xxw0qe@comcast.net>; Date: Fri, 10 Jun 2011 06:59:48 -0600; Using 2 chokes in series and not switching them is not a "carte blanche" solution to not having any series resonances. It is probably easier to get 2 chokes to work over all the bands but be wary if; /archives//html/Amps/2011-06/msg00130.html (8,109 bytes)
6. Re: [Amps] RF choke switching (score: 1): Author: Vic K2VCO <vic@rakefet.com>; Date: Fri, 10 Jun 2011 07:43:34 -0700; Because if I do this, the bigger choke will be out of the circuit completely on the high bands. My method will leave it there, after the bypass, to provide additional filtering on the HV lead to the; /archives//html/Amps/2011-06/msg00131.html (8,768 bytes)
7. Re: [Amps] RF choke switching (score: 1): Author: Larry Benko <xxw0qe@comcast.net>; Date: Fri, 10 Jun 2011 09:09:22 -0600; Vic, Look at my post of a few hours ago. Two non-resonant chokes in series can together be resonant. This is basic circuit theory and there is no way around the issue. Larry, W0QE ___________________; /archives//html/Amps/2011-06/msg00132.html (9,541 bytes)
8. Re: [Amps] RF choke switching (score: 1): Author: Vic K2VCO <vic@rakefet.com>; Date: Fri, 10 Jun 2011 08:39:35 -0700; Most ham amplifiers use 200 uh chokes for all bands. It's hard to make a 200 uh choke that won't have resonances near a ham band when WARC bands are included. But this choke only has 2.26K of reactan; /archives//html/Amps/2011-06/msg00133.html (11,338 bytes)
9. Re: [Amps] RF choke switching (score: 1): Author: Vic K2VCO <vic@rakefet.com>; Date: Fri, 10 Jun 2011 10:22:25 -0700; Correct, but if there is a bypass capacitor to ground in between the chokes, then the additional impedance provided by the big choke -- even if lower than it could be due to a nearby resonance -- is; /archives//html/Amps/2011-06/msg00136.html (10,558 bytes)
10. Re: [Amps] RF choke switching (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Fri, 10 Jun 2011 13:58:36 -0400; The usual method is to lift the first chokes ground lead with a vacuum relay and another (or a dpdt one) to remove the short around the 2nd choke. A variant is to leave the second choke in the circui; /archives//html/Amps/2011-06/msg00138.html (11,951 bytes)
11. Re: [Amps] RF choke switching (score: 1): Author: Larry Benko <xxw0qe@comcast.net>; Date: Fri, 10 Jun 2011 12:51:40 -0600; Vic, Shane, and others, Changing the circuit to be 2 inductors in series with a capacitor to ground at the connection point between the inductors changes things but does not fix the possible low over; /archives//html/Amps/2011-06/msg00140.html (12,870 bytes)

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