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1. [Amps] source of '3rd harmonic' (score: 1): Author: Dan Sawyer <dansawyer@earthlink.net>; Date: Thu, 18 Nov 2010 21:31:53 -0800; All, I am trying to add bias to a commercial class B NPN RF module. The input and outputs are 4:1 and 1:4 'binocular' transformers, feedback is a simple CR network. The output has a significant 3rd h; /archives//html/Amps/2010-11/msg00340.html (6,822 bytes)
2. Re: [Amps] source of '3rd harmonic' (score: 1): Author: TexasRF@aol.com; Date: Fri, 19 Nov 2010 05:27:33 EST; Hi Dan, the binocular transformer causes the two transistors in the amplifier to operate in a push-pull fashion. A characteristic of push-pull design is that the fundamental and all odd harmonics com; /archives//html/Amps/2010-11/msg00346.html (8,398 bytes)
3. Re: [Amps] source of '3rd harmonic' (score: 1): Author: Dan Sawyer <dansawyer@earthlink.net>; Date: Fri, 19 Nov 2010 06:45:37 -0800; Ah, good question. The case is a simple single tone, x MHz in produces an amplified output of x MHz at plus some level and a series of odd harmonics, 3 times x. The 3rd harmonic is down 10 db from th; /archives//html/Amps/2010-11/msg00352.html (9,397 bytes)
4. Re: [Amps] source of '3rd harmonic' (score: 1): Author: Ken Brown <ken.d.brown@hawaiiantel.net>; Date: Sat, 20 Nov 2010 16:20:26 -1000; Hi Dan, Odd harmonics are caused by pretty much the same things as even harmonics, namely distortion. In a push-pull arrangement, which it sounds like your amplifier is (probably most transistor PAs; /archives//html/Amps/2010-11/msg00371.html (9,017 bytes)
5. Re: [Amps] source of '3rd harmonic' (score: 1): Author: Shane Youhouse <kd6vxi@gmail.com>; Date: Sat, 20 Nov 2010 18:53:42 -0800; I'd try putting a single steering diode from the CT junction of the input transformer to the bias network. Just ensures safety. Are you SURE that you have good bias? Your bias is a LOW impedance sour; /archives//html/Amps/2010-11/msg00372.html (11,333 bytes)
6. Re: [Amps] source of '3rd harmonic' (score: 1): Author: donroden@hiwaay.net; Date: Sun, 21 Nov 2010 06:12:54 -0600; Good info, Shane. One question. Why is the eight device amp called a Texas Star Sweet Sixteen ? Don W4DNR _______________________________________________ Amps mailing list Amps@contesting.com http://; /archives//html/Amps/2010-11/msg00374.html (7,741 bytes)

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