Mail Archive Search: <+subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*\[Amps\]\s+Overdrive\s+protection\s*$/>

Results:

References: [ +subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*\[Amps\]\s+Overdrive\s+protection\s*$/: 57 ]

Total 57 documents matching your query.

21. Re: [Amps] Overdrive protection (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Thu, 26 Jul 2012 21:26:40 -0400; Interesting, I have 4 TS-830's and none do it. And couldnt get 150W out of them either. One is specifically used to test amps and the others were all thoroughly tested before being put into driving t; /archives//html/Amps/2012-07/msg00290.html (11,767 bytes)
22. Re: [Amps] Overdrive protection (score: 1): Author: Ron Youvan <ka4inm@gmail.com>; Date: Thu, 26 Jul 2012 22:27:45 -0400; /*snip*/ I don't see why the ALC can't be adjusted so the amplifier is never over driven and is kept at the desired operating drive level. I actually thought that was the idea. -- 73 Ron KA4INM - All; /archives//html/Amps/2012-07/msg00291.html (9,807 bytes)
23. Re: [Amps] Overdrive protection (score: 1): Author: "Joe Subich, W4TV" <lists@subich.com>; Date: Thu, 26 Jul 2012 22:51:22 -0400; The problem is that the transceiver ALC time constant is too slow and the transceiver IF stages have excess gain. Thus the transceiver makes "full power" for the few milliseconds *before* the ALC ca; /archives//html/Amps/2012-07/msg00292.html (10,239 bytes)
24. Re: [Amps] Overdrive protection (score: 1): Author: Michael Tope <W4EF@dellroy.com>; Date: Fri, 27 Jul 2012 06:13:23 -0700; With an extra SO-239 on the rear panel and a coax jumper, the amp manufacturer could provide a "loop-thru" for an external power attenuator. This would allow the user to tailor the drive requirements; /archives//html/Amps/2012-07/msg00295.html (9,617 bytes)
25. Re: [Amps] Overdrive protection (score: 1): Author: Michael Tope <W4EF@dellroy.com>; Date: Fri, 27 Jul 2012 06:36:31 -0700; Oh, duh, I should have said two extra SO-239s, otherwise you couldn't insert the attenuator after the input T/R relay. Mike W4EF................. _______________________________________________ Amps; /archives//html/Amps/2012-07/msg00296.html (9,384 bytes)
26. [Amps] Overdrive protection (score: 1): Author: "Phil & Debbie Salas" <dpsalas@tx.rr.com>; Date: Fri, 27 Jul 2012 09:01:50 -0500; The overshoot problem is a different issue. My IC-706MKII would overshoot to 140 watts on the first dit regardless of output power setting. Duration of the pulse is a bit less than 2ms. I've been tol; /archives//html/Amps/2012-07/msg00297.html (6,964 bytes)
27. Re: [Amps] Overdrive protection (score: 1): Author: "Jim Hargrave" <w5ifp@gvtc.com>; Date: Fri, 27 Jul 2012 09:11:13 -0500; Duh... Why not just use the RF PWR adjustment on the front of the transceiver and save all that costs and wasted heat dissipated by the attenuator. "Discipline" is the keyword. With proper drive powe; /archives//html/Amps/2012-07/msg00298.html (10,671 bytes)
28. Re: [Amps] Overdrive protection (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Fri, 27 Jul 2012 10:13:30 -0400; Johnson provided an optional attenuator as far back as the Desk KW of the 50's to alow different exciters to be used as well as AB2 and Class C. They didnt sell it at a ridiculous mark up either. Car; /archives//html/Amps/2012-07/msg00299.html (11,144 bytes)
29. Re: [Amps] Overdrive protection (score: 1): Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>; Date: Fri, 27 Jul 2012 10:28:49 -0400; That is the problem. With the power turned down, the first dit comes through at full power on some rigs. This approach works just fine in both of my rigs. Although the 756 Pro line is notorious for t; /archives//html/Amps/2012-07/msg00300.html (12,245 bytes)
30. Re: [Amps] Overdrive protection (score: 1): Author: "Joe Subich, W4TV" <lists@subich.com>; Date: Fri, 27 Jul 2012 10:32:17 -0400; Because many transceivers designers - particularly Icom - control Power with the ALC circuit. That does nothing to stop the spike due to a slow ALC attack time and excess IF gain (excess drive to th; /archives//html/Amps/2012-07/msg00301.html (12,031 bytes)
31. Re: [Amps] Overdrive protection (score: 1): Author: "Jerry Kaidor" <jerry@tr2.com>; Date: Fri, 27 Jul 2012 09:08:12 -0700 (PDT); Back in the late 70's I had access to some very good test equipment - I was working as a bench tech in an instrument shop. I would bring in my ham rigs to play. On the spectrum analyzer I would see a; /archives//html/Amps/2012-07/msg00302.html (10,028 bytes)
32. Re: [Amps] Overdrive protection (score: 1): Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>; Date: Fri, 27 Jul 2012 10:49:25 -0400; That's one of those, "It all depends". Like other topics, some do and some don't. 73 Roger (K8RI) _______________________________________________ Amps mailing list Amps@contesting.com http://lists.co; /archives//html/Amps/2012-07/msg00303.html (10,534 bytes)
33. Re: [Amps] Overdrive protection (score: 1): Author: Michael Tope <W4EF@dellroy.com>; Date: Fri, 27 Jul 2012 07:51:55 -0700; Jim, The issue isn't so much lack of discipline as it is the power overshoot of the internal ALC circuits found in many modern solid-state transceivers. Yes, a disciplined operator can dial back the; /archives//html/Amps/2012-07/msg00304.html (10,459 bytes)
34. Re: [Amps] Overdrive protection (score: 1): Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>; Date: Fri, 27 Jul 2012 10:55:24 -0400; Ceramic tubes the size of those old 4-1000As don't have a bit of trouble either. 73 Roger (K8RI) That's the one nice _______________________________________________ Amps mailing list Amps@contesting.; /archives//html/Amps/2012-07/msg00305.html (11,069 bytes)
35. Re: [Amps] Overdrive protection (score: 1): Author: Vic K2VCO <k2vco.vic@gmail.com>; Date: Fri, 27 Jul 2012 08:32:20 -0700; In some cases it depends on how you adjust the transceiver. The TS930s had both a Carrier control and a Power control active in CW mode. The power control set the point at which the ALC would hold th; /archives//html/Amps/2012-07/msg00306.html (12,512 bytes)
36. Re: [Amps] Overdrive protection (score: 1): Author: "Joe Subich, W4TV" <lists@subich.com>; Date: Fri, 27 Jul 2012 11:49:28 -0400; Find a separate carrier control in modern transceivers! In general the carrier control is buried in a factory set-up menu as the IF gain on each band and they are often set high specifically to avoi; /archives//html/Amps/2012-07/msg00307.html (13,271 bytes)
37. Re: [Amps] Overdrive protection (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Fri, 27 Jul 2012 11:59:21 -0400; It's probably worth distinguishing between the two types of RF power controls commonly found on moden transceivers. We all know that the RF Output Contol is used to adjust the nominal power of the t; /archives//html/Amps/2012-07/msg00308.html (11,235 bytes)
38. Re: [Amps] Overdrive protection (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Fri, 27 Jul 2012 12:02:18 -0400; OK on ancient history (-; of the best test equipment or built up a suitable substitute here at home. What I have found with SS gear that Ive tested (and that is far from all of them) is that there ar; /archives//html/Amps/2012-07/msg00309.html (11,427 bytes)
39. Re: [Amps] Overdrive protection (score: 1): Author: "Jim W7RY" <jimw7ry@gmail.com>; Date: Fri, 27 Jul 2012 12:39:53 -0700; Although the 756 Pro line is notorious for this,...... 73 Roger (K8RI) What do you base your statement on Roger? Just hearsay or actual experience? Something on the web? If so, could you point me to; /archives//html/Amps/2012-07/msg00310.html (9,535 bytes)
40. Re: [Amps] Overdrive protection (score: 1): Author: "David Jordan" <wa3gin@comcast.net>; Date: Fri, 27 Jul 2012 15:48:35 -0400; FYI... from ALPHA's Brad K0HM All, We have received a number of phone calls on the last alpha news letter about the abuse log and the spikes generated by radios. Just to clear this up. The abuse log; /archives//html/Amps/2012-07/msg00311.html (9,933 bytes)

Current List: 21 - 40
Page: [1] [2] [3]