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41. Re: [Amps] Overdrive protection (score: 1): Author: Richard Solomon <dickw1ksz@gmail.com>; Date: Fri, 27 Jul 2012 12:49:31 -0700; So far, I have seen no mention of the current YAESU rigs. Has anyone had a problem with any of them (and I do mean RF overshoot) ? 73, Dick, W1KSZ _______________________________________________ Amps; /archives//html/Amps/2012-07/msg00312.html (10,040 bytes)
42. Re: [Amps] Overdrive protection (score: 1): Author: "Jim W7RY" <jimw7ry@gmail.com>; Date: Fri, 27 Jul 2012 12:54:35 -0700; 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/msg00313.html (10,061 bytes)
43. Re: [Amps] Overdrive protection (score: 1): Author: Jim Barber <audioguy@q.com>; Date: Fri, 27 Jul 2012 13:01:02 -0700; And we have conflicting opinions on the IC-7600 . I bought one within the 30 days or so and while I think it's a poor fit for me for other reasons I haven't had it connected to an amp yet and am curi; /archives//html/Amps/2012-07/msg00314.html (10,689 bytes)
44. Re: [Amps] Overdrive protection (score: 1): Author: Bert Almemo <balmemo@sympatico.ca>; Date: Fri, 27 Jul 2012 21:42:14 -0400; There is a simple solution. I use a 9V battery and a pot to set an appropriate/fixed ALC voltage to my 746 for the drive power I want. Works like a charm and no overshoots. 73 Bert, VE3NR The problem; /archives//html/Amps/2012-07/msg00316.html (11,474 bytes)
45. Re: [Amps] Overdrive protection (score: 1): Author: "Leigh Turner" <invertech@frontierisp.net.au>; Date: Sat, 28 Jul 2012 11:19:00 +0930; Roger, that's because you have a very well-designed amp that behaves itself and responds benignly with whatever's thrown at it.... :-) Leigh VK5KLT That is the problem. With the power turned down, th; /archives//html/Amps/2012-07/msg00317.html (12,072 bytes)
46. Re: [Amps] Overdrive protection (score: 1): Author: Rob Stampfli <rob@cboh.org>; Date: Fri, 27 Jul 2012 21:54:56 -0400; Glad it worked for you and your 746. I tried this trick with my Kenwood 430 years ago. The 430 has no power control and I wanted to use it to drive a linear that required less than 100W input. While; /archives//html/Amps/2012-07/msg00318.html (9,360 bytes)
47. Re: [Amps] Overdrive protection (score: 1): Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>; Date: Sat, 28 Jul 2012 02:34:21 -0400; This has been discussed on Ham Amps in conjunction with Tetrode amps, as well as the Icom groups No, contrary to all of the reports I've read, I've not experience any problem. OTOH I've had no proble; /archives//html/Amps/2012-07/msg00324.html (9,807 bytes)
48. Re: [Amps] Overdrive protection (score: 1): Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>; Date: Sat, 28 Jul 2012 02:36:47 -0400; I run both the old 756 Pro and the new Yaesu FTDX5000MP with no problems from either. The 5000MP drives a tetrode amp generally in class A, but sometimes in AB1 73 Roger (K8RI) ______________________; /archives//html/Amps/2012-07/msg00325.html (10,520 bytes)
49. [Amps] Overdrive protection (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Sat, 28 Jul 2012 04:45:27 -0700; 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/msg00328.html (10,102 bytes)
50. [Amps] Overdrive protection (score: 1): Author: "Phil & Debbie Salas" <dpsalas@tx.rr.com>; Date: Sat, 28 Jul 2012 07:46:30 -0500; "There is a simple solution. I use a 9V battery and a pot to set an appropriate/fixed ALC voltage to my 746 for the drive power I want. Works like a charm and no overshoots. 73 Bert, VE3NR" This does; /archives//html/Amps/2012-07/msg00329.html (7,204 bytes)
51. Re: [Amps] Overdrive protection (score: 1): Author: Roger <sub1@rogerhalstead.com>; Date: Thu, 26 Jul 2012 16:44:02 -0400; Only one brand that I know of and do all of theirs do that? I never had a problem with my 756 Pro and I believe than are one of those that supposedly have the spike. My FTDX5000MP does not create a s; /archives//html/Amps/2012-07/msg00330.html (10,920 bytes)
52. Re: [Amps] Overdrive protection (score: 1): Author: Roger <sub1@rogerhalstead.com>; Date: Fri, 27 Jul 2012 10:27:01 -0400; That is the problem. With the power turned down, the first dit comes through at full power on some rigs. Although the 756 Pro line is notorious for this, mine does not do it, nor does my FTDX5000MP.; /archives//html/Amps/2012-07/msg00331.html (11,931 bytes)
53. Re: [Amps] Overdrive protection (score: 1): Author: "Joe Giacobello, K2XX" <k2xx@swva.net>; Date: Sat, 28 Jul 2012 10:09:31 -0400; I probably should address this question to the FT-5000 list, but since this discussion concerns ALC control, it's also appropriate here. There is a switch on the back of the 5000 called E.ALC. Accord; /archives//html/Amps/2012-07/msg00332.html (12,026 bytes)
54. Re: [Amps] Overdrive protection (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Sat, 28 Jul 2012 10:35:33 -0400; Joe, According to the operating manual, the FTdx-5K's E.ALC switch is used to change ALC recovery time (not gain), supposedly for optimized operation into the VL-1000 solid-state amp. The alternate s; /archives//html/Amps/2012-07/msg00333.html (13,329 bytes)
55. Re: [Amps] Overdrive protection (score: 1): Author: Mike <k4gmh@arrl.net>; Date: Sat, 28 Jul 2012 12:17:51 -0400; Hello Bert, Thanks for the info. on how to tame the IC746 overshoot. Too bad I didn't learn about the 746's overshoot problem or your approach to tame it until it cost me a 4CX1600 in a HB amp. Chang; /archives//html/Amps/2012-07/msg00336.html (12,636 bytes)
56. Re: [Amps] Overdrive protection (score: 1): Author: <jhurry@austin.rr.com>; Date: Sat, 28 Jul 2012 17:52:19 +0000; A properly designed amp should be able to take care of itself. ALC is a ham carry over from when there were no Drive controls, so the ALC was used to bring down the power in the Swan/Galaxy days to k; /archives//html/Amps/2012-07/msg00337.html (8,793 bytes)
57. Re: [Amps] Overdrive protection (score: 1): Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>; Date: Sat, 28 Jul 2012 15:36:23 -0400; That's pretty much how I run it. Actually I tune for about 2KW into the dummy load then increase the loading to bring it back to 1500. The amp will run 2500 pep, but running it like this gets me lots; /archives//html/Amps/2012-07/msg00341.html (9,638 bytes)

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