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Total 51 documents matching your query.

1. [AMPS] Bias for SB-220 (score: 1): Author: n4zr@contesting.com (Pete Smith); Date: Tue, 01 Jun 1999 11:27:29 -0400; OK, I'm confused. I'm building an electronic bias switch and vacuum relay QSK into my SB-220, having finally been jarred out of procrastination by the failure of the changeover relay this past weeken; /archives//html/Amps/1999-06/msg00007.html (8,578 bytes)
2. [AMPS] Bias for SB-220 (score: 1): Author: Dick Green" <dick.green@valley.net (Dick Green); Date: Tue, 1 Jun 1999 11:55:53 -0400; Pete, I built Rich's electronic bias for my SB-221 ten years ago, then recently rebuilt it after a powerful gassy tube arc destroyed a couple of components on it. I think it works very well (as does; /archives//html/Amps/1999-06/msg00008.html (8,977 bytes)
3. [AMPS] Bias for SB-220 (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Tue, 1 Jun 1999 14:24:15 -0400; Hi Pete, ' In a grounded grid PA, the output and input are in series. That is what reduces gain, because it adds heavy amounts of negative feedback. With so much negative feedback, there is very litt; /archives//html/Amps/1999-06/msg00012.html (10,651 bytes)
4. [AMPS] Bias for SB-220 (score: 1): Author: measures@vc.net (Rich Measures); Date: Tue, 1 Jun 1999 17:33:58 -0700; ? The ZSAC (zero signal anode current) matters more than the actual bias voltage. In a 3-500Z, IMD goes up rapidly with a ZSAC of less than 65mA, I like to use between 75 and 100mA, - If an electron; /archives//html/Amps/1999-06/msg00015.html (9,093 bytes)
5. [AMPS] Bias for SB-220 (score: 1): Author: wb8jkr@juno.com (wb8jkr@juno.com); Date: Tue, 1 Jun 1999 21:41:16 EDT; This is true, but if you place a high value resistor acrossed the switching transistor to allow about 5 ma or so of Idle current in standby and place a 10 to 25 ufd capacitor acrossed the switching t; /archives//html/Amps/1999-06/msg00016.html (9,844 bytes)
6. [AMPS] Bias for SB-220 (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Wed, 2 Jun 1999 09:24:19 +0100; out >of linear bias during normal speech when the relays are in the transmit Do I understand from that comment that the majority of these bias schemes actually try to switch to follow the RF envelope; /archives//html/Amps/1999-06/msg00029.html (11,156 bytes)
7. [AMPS] Bias for SB-220 (score: 1): Author: measures@vc.net (Rich Measures); Date: Wed, 2 Jun 1999 04:11:35 -0700; ? The problem is a bit more complex than hang time. In humanoid speech, nothing happens on a precise time schedule. Even if the soft-syllable hang time problem could be ameliorated, another problem; /archives//html/Amps/1999-06/msg00031.html (10,207 bytes)
8. [AMPS] Bias for SB-220 (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Wed, 2 Jun 1999 12:25:59 +0100; bias I must admit that I've never thought it through very carefully before, but unless the bias is switched before the RF gets there, you must be effectively pulse modulating. This will give the usua; /archives//html/Amps/1999-06/msg00033.html (9,689 bytes)
9. [AMPS] Bias for SB-220 (score: 1): Author: yo3ctk@qsl.net (yo3ctk@qsl.net); Date: Wed, 02 Jun 1999 15:03:13 +0300; Being on this thread, why one can possibly need RF-actuated electronic bias switching ? Could it be in order to save some power dissipated by the final tubes, corresponding to the amount of idle curr; /archives//html/Amps/1999-06/msg00034.html (9,446 bytes)
10. [AMPS] Bias for SB-220 (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Wed, 2 Jun 1999 08:18:56 -0400; Hi Peter, Rich apparently does not exactly understand how auto-bias works in many cases. In the AL-80B and AL-800 series, auto-bias turns on hard with drive power as low as a few dozen milliwatts. Bu; /archives//html/Amps/1999-06/msg00036.html (10,413 bytes)
11. [AMPS] Bias for SB-220 (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Wed, 2 Jun 1999 13:28:05 +0100; with TX/RX switching. I agree; but perhaps one has to remember the business about 'kidding some of the people some of the time' You can make quite a bit of money out of pandering to the latest fashio; /archives//html/Amps/1999-06/msg00038.html (9,791 bytes)
12. [AMPS] Bias for SB-220 (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Wed, 2 Jun 1999 08:54:04 -0400; First, RF bias switching does not cause problems when properly implemented. So that is a non-issue. Second, while Rich focuses on the electronic bias with empirical conclusions many rigs have horrid; /archives//html/Amps/1999-06/msg00040.html (12,217 bytes)
13. [AMPS] Bias for SB-220 (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Wed, 2 Jun 1999 14:25:23 +0100; So how much dissipation do you save? Assuming that you bias the PA off totally during receive, how much does the dissipation go down by reducing dissipation at the syllabic rate? Especially as the b; /archives//html/Amps/1999-06/msg00041.html (9,336 bytes)
14. [AMPS] Bias for SB-220 (score: 1): Author: yo3ctk@qsl.net (yo3ctk@qsl.net); Date: Wed, 02 Jun 1999 17:03:06 +0300; W8JI: The real problem is wasted power and heat. Letting the bias run in full-tilt on condition is like putting a 600-1000 watt space heater the room. Ok, let me see: 1500 out at 60% efficiency means; /archives//html/Amps/1999-06/msg00044.html (9,462 bytes)
15. [AMPS] Bias for SB-220 (score: 1): Author: measures@vc.net (Rich Measures); Date: Wed, 2 Jun 1999 09:50:38 -0700; ? Indeed, Peter, indeed. On this side of the pond, it is a well-known fact that gopher snakes consistentently achieve higher speeds in gopher-tunnels if they are liberally lubed with high-quality sn; /archives//html/Amps/1999-06/msg00049.html (9,913 bytes)
16. [AMPS] Bias for SB-220 (score: 1): Author: measures@vc.net (Rich Measures); Date: Wed, 2 Jun 1999 09:50:39 -0700; ? But of course!. . . A three-tone test does not simulate the problem of using RF-actuated bias-switching with humanoid speech. . Curiously, G2DAF-enthusiasts (which Mr. Rauch quite rightly ridicule; /archives//html/Amps/1999-06/msg00050.html (11,779 bytes)
17. [AMPS] Bias for SB-220 (score: 1): Author: measures@vc.net (Rich Measures); Date: Wed, 2 Jun 1999 09:50:35 -0700; ? I continue to hear amplifiers with the problem, Tom. When can proper implementation be explected? ? Leading edge distortion occurs during ALC attack. Leading edge distortion can be considerable if; /archives//html/Amps/1999-06/msg00052.html (10,386 bytes)
18. [AMPS] Bias for SB-220 (score: 1): Author: Dick Green" <dick.green@valley.net (Dick Green); Date: Wed, 2 Jun 1999 13:03:18 -0400; Let's not forget the TS950SDX, which suffers from the same problem. 73, Dick, WC1M -- FAQ on WWW: http://www.contesting.com/ampfaq.html Submissions: amps@contesting.com Administrative requests: amps; /archives//html/Amps/1999-06/msg00054.html (9,335 bytes)
19. [AMPS] Bias for SB-220 (score: 1): Author: measures@vc.net (Rich Measures); Date: Wed, 2 Jun 1999 11:30:43 -0700; ? Only for those who believe that way mo' ALC is way mo' betta - cheers, Dick Rich... R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures -- FAQ on WWW: http://www.contesting.com/ampfaq.html; /archives//html/Amps/1999-06/msg00056.html (9,339 bytes)
20. [AMPS] Bias for SB-220 (score: 1): Author: sm2cew@telia.com (Peter Sundberg); Date: Wed, 02 Jun 1999 21:05:28 +0200; Gee Boy's... You all talk about IMD, IP3 etc like this was the BIG problem on our ham bands these days.. The real problem is BAD OPERATING HABITS from BAD OPERATORS ! I use old radios (Drake TR7/R7,; /archives//html/Amps/1999-06/msg00057.html (9,823 bytes)

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