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References: [ +subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*\[Amps\]\s+Need\s+for\s+bias\s+switch\s+$CW\/SSB$\s*$/: 18 ]

Total 18 documents matching your query.

1. [Amps] Need for bias switch (CW/SSB) (score: 1): Author: "Charlie" <charlie@drhabekost.com>; Date: Mon, 11 Jan 2016 10:16:58 -0800; Folks I am putting a 8877 amp together. I was wondering why some amps have a "CW/SSB" switch. Assuming the power supply can handle cw key down, other than higher efficiency, what other reason could t; /archives//html/Amps/2016-01/msg00001.html (6,504 bytes)
2. Re: [Amps] Need for bias switch (CW/SSB) (score: 1): Author: "Mike Feher" <n4fs@eozinc.com>; Date: Tue, 12 Jan 2016 10:24:59 -0500; In CW it can run Class C, but for SSB it has to be linear. 73 - Mike Mike B. Feher, N4FS 89 Arnold Blvd. Howell, NJ, 07731 732-886-5960 Folks I am putting a 8877 amp together. I was wondering why som; /archives//html/Amps/2016-01/msg00002.html (8,217 bytes)
3. Re: [Amps] Need for bias switch (CW/SSB) (score: 1): Author: n8de@thepoint.net; Date: Tue, 12 Jan 2016 10:35:30 -0500; Most amps that have that switch are Class C on CW and some class AB (1 or 2) on SSB. That switch is used to change the bias on the tube to change amp class. 73 Don N8DE Folks I am putting a 8877 amp; /archives//html/Amps/2016-01/msg00003.html (8,118 bytes)
4. Re: [Amps] Need for bias switch (CW/SSB) (score: 1): Author: "Jim Garland" <4cx250b@miamioh.edu>; Date: Tue, 12 Jan 2016 08:48:13 -0700; Charlie, With an 8877, two bias settings aren't necessary. You'd gain a bit more efficiency on CW and slightly ower heat dissipation in the room, but that's about all. It's pretty important with tetr; /archives//html/Amps/2016-01/msg00004.html (8,709 bytes)
5. [Amps] Need for bias switch (CW/SSB) (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Tue, 12 Jan 2016 09:52:44 -0800; I am putting a 8877 amp together. I was wondering why some amps have a "CW/SSB" switch. Assuming the power supply can handle cw key down, other than higher efficiency, what other reason could there b; /archives//html/Amps/2016-01/msg00005.html (8,099 bytes)
6. Re: [Amps] Need for bias switch (CW/SSB) (score: 1): Author: "Carl" <km1h@jeremy.qozzy.com>; Date: Wed, 13 Jan 2016 12:41:01 -0500; The FCC did it! Originally the rule was 1000W DC input for any mode. Then it changed to 2000W PEP for SSB only so the plate transformer was tapped and a switch added, Some of those older amps have a; /archives//html/Amps/2016-01/msg00008.html (9,504 bytes)
7. Re: [Amps] Need for bias switch (CW/SSB) (score: 1): Author: Kim Elmore <cw_de_n5op@sbcglobal.net>; Date: Wed, 13 Jan 2016 14:41:52 -0600; I don't think this is true. Class C will generate terrible key clicks because it won't preserve the keying envelope. Kim N5OP "People that make music together cannot be enemies, at least as long as t; /archives//html/Amps/2016-01/msg00010.html (9,571 bytes)
8. Re: [Amps] Need for bias switch (CW/SSB) (score: 1): Author: "Steve Flood" <kk7uv@bresnan.net>; Date: Sun, 17 Jan 2016 06:36:07 -0700; I have an adjustable bias where I can run a little ZSAC for Class AB. But I can dial the bias until it *just* cuts off and I often use this setting for CW. What class am I running when I do so? I've; /archives//html/Amps/2016-01/msg00011.html (8,238 bytes)
9. Re: [Amps] Need for bias switch (CW/SSB) (score: 1): Author: Gerald Williamson via Amps <amps@contesting.com>; Date: Sun, 17 Jan 2016 08:55:52 -0500; Sounds like class B; plate current flows for 180 degrees of the excitation cycle. On the issue of key clicks and class C: Up until mid to late 50's when SSB came along, all of the ham amplifiers were; /archives//html/Amps/2016-01/msg00014.html (9,750 bytes)
10. Re: [Amps] Need for bias switch (CW/SSB) (score: 1): Author: Paul Christensen <w9ac@arrl.net>; Date: Sun, 17 Jan 2016 08:57:06 -0500; A class C amp will preserve the CW waveform in a linear region of operation, provided there's a means to sequence it out of class C during the T/R cycle and when the amp key line is active. Typically; /archives//html/Amps/2016-01/msg00015.html (11,687 bytes)
11. Re: [Amps] Need for bias switch (CW/SSB) (score: 1): Author: "Joe Subich, W4TV" <lists@subich.com>; Date: Sun, 17 Jan 2016 09:09:03 -0500; Class B is defined as a conduction angle of 180 degrees exactly - therefor one can not be "fairly deep Class B". It might be deep into Class AB2 - i.e., well beyond the point at which the tube start; /archives//html/Amps/2016-01/msg00016.html (9,873 bytes)
12. Re: [Amps] Need for bias switch (CW/SSB) (score: 1): Author: Ron Youvan <ka4inm@gmail.com>; Date: Sun, 17 Jan 2016 09:55:45 -0500; I don't think this is true. Class C will generate terrible key clicks because it won't preserve the keying envelope. That is not necessarily so, the keying waveform will be altered for sure, but I o; /archives//html/Amps/2016-01/msg00018.html (9,481 bytes)
13. Re: [Amps] Need for bias switch (CW/SSB) (score: 1): Author: RCM <robrk@nidhog.net>; Date: Sun, 17 Jan 2016 11:26:42 -0500; Back then, you keyed the cutoff bias of the amp. My Central Electronics 20A had -100 vdc out the back that followed the keying and did a full cutoff of the HB 4X250's with operating bias set for clas; /archives//html/Amps/2016-01/msg00020.html (9,493 bytes)
14. Re: [Amps] Need for bias switch (CW/SSB) (score: 1): Author: Vic Rosenthal <k2vco.vic@gmail.com>; Date: Sun, 17 Jan 2016 19:26:09 +0200; Close to cutoff is class B. If the amplifier has a combination of fixed bias plus some way of generating additional bias when driven (e.g. a grid resistor in a grid-driven amp) then it can move deepe; /archives//html/Amps/2016-01/msg00021.html (9,778 bytes)
15. Re: [Amps] Need for bias switch (CW/SSB) (score: 1): Author: "Carl" <km1h@jeremy.qozzy.com>; Date: Sun, 17 Jan 2016 13:08:33 -0500; The best way to tell if your CW signal is objectionable is to look at it on a spectrum analyzer which is built in to many SDR rigs, find someone running one and ask him. "just" cutoff is a twilight z; /archives//html/Amps/2016-01/msg00023.html (11,039 bytes)
16. Re: [Amps] Need for bias switch (CW/SSB) (score: 1): Author: "Carl" <km1h@jeremy.qozzy.com>; Date: Sun, 17 Jan 2016 13:12:59 -0500; Which is why saying Deep Class B signifies a variation and has been used for ages. Real old manuals used B/C Not accurate for a purist but fine for real world use. Carl KM1H Class B is defined as a c; /archives//html/Amps/2016-01/msg00024.html (10,950 bytes)
17. Re: [Amps] Need for bias switch (CW/SSB) (score: 1): Author: "Carl" <km1h@jeremy.qozzy.com>; Date: Sun, 17 Jan 2016 13:27:26 -0500; -100V isnt even close to a full cutoff description since typical operating bias in Class C is -90V for 250B's. Carl KM1H -- Original Message -- From: "RCM" <robrk@nidhog.net> To: <amps@contesting.com; /archives//html/Amps/2016-01/msg00026.html (11,115 bytes)
18. [Amps] Need for bias switch (CW/SSB) (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Mon, 18 Jan 2016 08:17:55 -0800; Back then, you keyed the cutoff bias of the amp. My Central Electronics 20A had -100 vdc out the back that followed the keying and did a full cutoff of the HB 4X250's with operating bias set for clas; /archives//html/Amps/2016-01/msg00036.html (8,907 bytes)

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