- 1. [Amps] question for you experts... (score: 1)
- Author: Kathy Bookmiller <wb2aio@yahoo.com>
- Date: Tue, 27 Mar 2012 14:10:43 -0700 (PDT)
- I was doing some checking out everything on my amp. (NCL2000) and noticed that the 2.5mh choke that is after the loading capacitor in the amp. was open-connection/wire is gone. Looking at others amps
- /archives//html/Amps/2012-03/msg00280.html (7,162 bytes)
- 2. Re: [Amps] question for you experts... (score: 1)
- Author: Vic K2VCO <k2vco.vic@gmail.com>
- Date: Tue, 27 Mar 2012 17:45:51 -0700
- The reason that's usually given for this choke is as you say, in order to protect the operator in the event that the blocking capacitor breaks down. But I have also had the same thought that you have
- /archives//html/Amps/2012-03/msg00282.html (8,803 bytes)
- 3. Re: [Amps] question for you experts... (score: 1)
- Author: "Carl" <km1h@jeremy.mv.com>
- Date: Tue, 27 Mar 2012 21:25:38 -0400
- Its there strictly for safety in case the plate blocking cap shorts. It will then short B+ to ground causing a fuse to open before self destructing....theoretically anyway. Anything from 1 to 2.5MH (
- /archives//html/Amps/2012-03/msg00283.html (9,158 bytes)
- 4. Re: [Amps] question for you experts... (score: 1)
- Author: "Gary Schafer" <garyschafer@comcast.net>
- Date: Tue, 27 Mar 2012 21:27:03 -0400
- A lot of people think that the choke is there as a safety device in case the plate blocking capacitor shorts. Most chokes across the output are too small in current carrying capacity to be an effecti
- /archives//html/Amps/2012-03/msg00284.html (10,124 bytes)
- 5. Re: [Amps] question for you experts... (score: 1)
- Author: "Carl" <km1h@jeremy.mv.com>
- Date: Tue, 27 Mar 2012 21:57:42 -0400
- The REAL reason was as I stated since it conformed with Handbook and magazine suggestions for decades prior. The other reason was a secondary benefit found by accident and reported in Hints and Kinks
- /archives//html/Amps/2012-03/msg00285.html (12,432 bytes)
- 6. Re: [Amps] question for you experts... (score: 1)
- Author: "Gary Schafer" <garyschafer@comcast.net>
- Date: Tue, 27 Mar 2012 22:20:41 -0400
- Well Carl, which is it? You seem to be waffling both ways. The only "safety benefit" that the choke offers is it keeps the DC voltage at zero on the output terminal of the amplifier so you won't get
- /archives//html/Amps/2012-03/msg00286.html (14,197 bytes)
- 7. Re: [Amps] question for you experts... (score: 1)
- Author: Bob K6UJ <k6uj@pacbell.net>
- Date: Tue, 27 Mar 2012 19:32:42 -0700
- Carl, My Alpha 76CA is still running perfectly after the conversion to 3CPX800's and the other items I did that you recommended here on the reflector. I haven't tried putting a brick on the key yet t
- /archives//html/Amps/2012-03/msg00287.html (13,811 bytes)
- 8. Re: [Amps] question for you experts... (score: 1)
- Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
- Date: Tue, 27 Mar 2012 22:50:39 -0400
- It's more than just the antenna connector. Add feed line and antenna. The practice of the choke goes way back to when the legal limit was considerably less than today and it applies to transmitters a
- /archives//html/Amps/2012-03/msg00288.html (15,801 bytes)
- 9. [Amps] question for you experts... (score: 1)
- Author: "Jim Thomson" <jim.thom@telus.net>
- Date: Wed, 28 Mar 2012 06:21:16 -0700
- Well Carl, which is it? You seem to be waffling both ways. The only "safety benefit" that the choke offers is it keeps the DC voltage at zero on the output terminal of the amplifier so you won't get
- /archives//html/Amps/2012-03/msg00290.html (11,378 bytes)
- 10. Re: [Amps] question for you experts... (score: 1)
- Author: "Carl" <km1h@jeremy.mv.com>
- Date: Wed, 28 Mar 2012 10:12:51 -0400
- _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
- /archives//html/Amps/2012-03/msg00296.html (15,723 bytes)
- 11. Re: [Amps] question for you experts... (score: 1)
- Author: "Lennart M" <lennart.michaelsson@telia.com>
- Date: Wed, 28 Mar 2012 16:34:51 +0200
- Being far from an expert but a ham for more than 50 yrs and having spent my entire life working with RF I would say: A DC short circuit at the output of an amplifier (with lethal plate voltage) is a
- /archives//html/Amps/2012-03/msg00297.html (10,469 bytes)
- 12. Re: [Amps] question for you experts... (score: 1)
- Author: Rob Atkinson <ranchorobbo@gmail.com>
- Date: Wed, 28 Mar 2012 11:32:06 -0500
- This sounds good but is doubtful: Just about all air variable load caps I have seen in use look like they are good for more than a few hundred volts, more like 1 or 2 KV. The stored energy in a 500 p
- /archives//html/Amps/2012-03/msg00305.html (9,227 bytes)
- 13. Re: [Amps] question for you experts... (score: 1)
- Author: "Gary Schafer" <garyschafer@comcast.net>
- Date: Wed, 28 Mar 2012 12:38:28 -0400
- While I agree that a "safety choke" on the output of the amp would be a good idea,, it is obvious that the chokes used in most ham amplifiers are not there as safety devices as they would be much lar
- /archives//html/Amps/2012-03/msg00306.html (14,592 bytes)
- 14. Re: [Amps] question for you experts... (score: 1)
- Author: "Carl" <km1h@jeremy.mv.com>
- Date: Wed, 28 Mar 2012 14:39:37 -0400
- Anybody else you want to blame Gary? I suppose youre perfect as usual and all the manufacturers are evil. When do you plan to run a test? Carl -- Original Message -- From: "Gary Schafer" <garyschafer
- /archives//html/Amps/2012-03/msg00311.html (14,826 bytes)
- 15. Re: [Amps] question for you experts... (score: 1)
- Author: Michael Tope <W4EF@dellroy.com>
- Date: Wed, 28 Mar 2012 14:30:08 -0700
- What you say makes sense, Gary, especially when you consider that the PI-network caps are usually air dielectric and the plate block capacitor is usually some sort of ceramic doorknob. If the blockin
- /archives//html/Amps/2012-03/msg00322.html (16,166 bytes)
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