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Total 78 documents matching your query.

41. Re: [Amps] Question for All Amp Builders... (score: 1)
Author: Jeff Carter <amps@hidden-valley.com>
Date: Fri, 20 Feb 2009 00:02:35 -0500
Scott, See if this helps: http://www.radars.me.uk/Pictures/HF_Linear/HFLinear1.jpg It purports to be continuous from 1.8 to 30 Mhz, and to give 800W out for 50W of drive. Jeff/KD4RBG -- Original mess
/archives//html/Amps/2009-02/msg00583.html (7,615 bytes)

42. [Amps] SB-220 and load mismatching... (score: 1)
Author: Jeff Carter <amps@hidden-valley.com>
Date: Mon, 2 Mar 2009 17:26:45 -0500
Hi all, It has recently come to my attention that folks are running amps into unmatched loads. Nobody seems to be worried about VSWR very much. I've got a SB-220 that I've never run into anything but
/archives//html/Amps/2009-03/msg00072.html (7,896 bytes)

43. Re: [Amps] SB-220 and load mismatching... (score: 1)
Author: Jeff Carter <amps@hidden-valley.com>
Date: Mon, 2 Mar 2009 20:07:07 -0500
Right, I've got a Cushcraft R7 which fits your requirement of a multiband vertical, but it's extremely narrowbanded. I rebuilt this antenna a couple of years ago, partially for this purpose, but both
/archives//html/Amps/2009-03/msg00076.html (9,474 bytes)

44. Re: [Amps] SWR & other things... (score: 1)
Author: Jeff Carter <amps@hidden-valley.com>
Date: Mon, 2 Mar 2009 21:50:53 -0500
You know, I have always wondered about that, and I was hoping that somebody would set me straight on it. As I was building this SB-220, I was thinking how much the components reminded me of the insid
/archives//html/Amps/2009-03/msg00079.html (8,190 bytes)

45. Re: [Amps] Panel Meter Article, QST (score: 1)
Author: Jeff Carter <amps@hidden-valley.com>
Date: Wed, 4 Mar 2009 20:27:04 -0500
Hi again, Scott, I'm sure everybody has their own method, but here's what I do: I take a variable power supply and a handful of known-good, known-value resistors. Starting with the highest value (say
/archives//html/Amps/2009-03/msg00120.html (8,717 bytes)

46. Re: [Amps] An Extra Thank You! (score: 1)
Author: Jeff Carter <amps@hidden-valley.com>
Date: Thu, 5 Mar 2009 15:55:01 -0500
Congratulations! It's such a rush to work on something like that and see it work when you're done. To answer your questions, I have to say it's been a while, and I'm sure AMPS will jump in and correc
/archives//html/Amps/2009-03/msg00164.html (8,704 bytes)

47. Re: [Amps] An Extra Thank You! (score: 1)
Author: Jeff Carter <amps@hidden-valley.com>
Date: Thu, 5 Mar 2009 16:14:45 -0500
That makes sense. So it's: 450/(2400v*375ma)= 450/(900)= 50% Does that sound right? Seems suspiciously like a round number guess instead of something I just calculated... Jeff/KD4RBG -- Original mess
/archives//html/Amps/2009-03/msg00169.html (8,812 bytes)

48. Re: [Amps] An Extra Thank You! (score: 1)
Author: Jeff Carter <amps@hidden-valley.com>
Date: Thu, 5 Mar 2009 16:22:35 -0500
I didn't add the drive back in on mine, so I'm off by that 20W. I'm not sure I completely understand why the drive is added back. You could write a thick, thick book with what I don't know about tube
/archives//html/Amps/2009-03/msg00172.html (9,089 bytes)

49. Re: [Amps] Dentron mla-2500 meters (score: 1)
Author: Jeff Carter <amps@hidden-valley.com>
Date: Mon, 16 Mar 2009 18:28:29 -0400
Interesting choice of words (cave), considering bats have been measured doing echolocation all the way up to 120 Khz, or 2500 meters. We now return you to your regularly scheduled AMPS discussion. Je
/archives//html/Amps/2009-03/msg00451.html (7,706 bytes)

50. Re: [Amps] Heathkit SB220 manual (score: 1)
Author: Jeff Carter <amps@hidden-valley.com>
Date: Mon, 16 Mar 2009 21:09:33 -0400
I do, but it's 50 Megabytes. You'd be better served to download it, because 7 out of 10 ISPs will kick back an attachment over 10 meg. in size. If you're sure you can receive that big an attachment,
/archives//html/Amps/2009-03/msg00455.html (7,799 bytes)

51. Re: [Amps] Heathkit SB220 manual (score: 1)
Author: Jeff Carter <amps@hidden-valley.com>
Date: Tue, 17 Mar 2009 14:12:55 -0400
I agree, they'll always be available on sites outside the US, and available quietly through individuals who are in love with these old boxes. Some users of old radio gear in other countries, most not
/archives//html/Amps/2009-03/msg00467.html (9,567 bytes)

52. Re: [Amps] Heathkit SB220 manual (score: 1)
Author: Jeff Carter <amps@hidden-valley.com>
Date: Tue, 17 Mar 2009 14:52:05 -0400
I totally concur. I think we as hams might be slightly guilty of contributing to the problem, though. In years past, these manuals have been listed on eBay either bound or on CD, and rather than do a
/archives//html/Amps/2009-03/msg00469.html (9,985 bytes)

53. Re: [Amps] High SWR was SB-1000 tuning question (score: 1)
Author: Jeff Carter <amps@hidden-valley.com>
Date: Wed, 22 Apr 2009 16:06:47 -0400
I feel this way, too. I have a SB-220, but I only run it on 80m because that's the only place I have a 1:1 SWR. I have other antennas, but none of them give me a good enough match for me to feel conf
/archives//html/Amps/2009-04/msg00210.html (8,560 bytes)

54. Re: [Amps] High SWR (score: 1)
Author: Jeff Carter <amps@hidden-valley.com>
Date: Wed, 22 Apr 2009 16:52:57 -0400
No, it's nothing special at all. I've got a 60-65' oak tree in the yard, and I used a fishing rod to "access" the top of the tree for purposes of installing this inverted V. Even that is being sort o
/archives//html/Amps/2009-04/msg00214.html (7,414 bytes)

55. Re: [Amps] High SWR (score: 1)
Author: Jeff Carter <amps@hidden-valley.com>
Date: Wed, 22 Apr 2009 17:21:21 -0400
I have had others tell me I can get away with it, too. At the center of the issue, the problem isn't engineering, it's cowardice. See, I built this amp from the metal up, and it's probably the cooles
/archives//html/Amps/2009-04/msg00216.html (9,753 bytes)

56. Re: [Amps] High SWR (score: 1)
Author: Jeff Carter <amps@hidden-valley.com>
Date: Thu, 23 Apr 2009 13:33:24 -0400
Back when I was in broadcasting full-time, VSWR was important, too. That situation had nothing to do with cheap finals, it was mostly about efficiency. Things I took for granted working with high pow
/archives//html/Amps/2009-04/msg00273.html (8,887 bytes)

57. Re: [Amps] High SWR (score: 1)
Author: Jeff Carter <amps@hidden-valley.com>
Date: Thu, 23 Apr 2009 14:15:38 -0400
Nothing brought home standing waves to me like a slotted line. I haven't seen one of those since college, though. You can look at all the simulations in the world, but actually seeing the minimums an
/archives//html/Amps/2009-04/msg00279.html (9,417 bytes)

58. Re: [Amps] High SWR (score: 1)
Author: Jeff Carter <amps@hidden-valley.com>
Date: Thu, 23 Apr 2009 15:55:34 -0400
Ham Radio is kind of like Mount Everest. Whatever it is, you can do it, but it's likely been done before, and better. Thanks for the link. Jeff/KD4RBG _______________________________________________
/archives//html/Amps/2009-04/msg00287.html (8,616 bytes)

59. Re: [Amps] Cleaning Cigarette tar....? (score: 1)
Author: Jeff Carter <amps@hidden-valley.com>
Date: Sat, 1 Aug 2009 22:27:01 -0400
I second this. In fact, Don may be a little modest here. Scrubbing Bubbles is the best all purpose cleaner for PCB boards and electronic assemblies I've ever found in 20+ years of fooling around with
/archives//html/Amps/2009-08/msg00018.html (7,911 bytes)

60. Re: [Amps] PEP Reading Wattmeter (score: 1)
Author: Jeff Carter <amps@hidden-valley.com>
Date: Thu, 1 Oct 2009 19:45:44 -0400
I'd like to put in another vote for the Autek WM-1. They're reasonably inexpensive on the used market and it's been perfect for my needs. Jeff/KD4RBG _______________________________________________ A
/archives//html/Amps/2009-10/msg00009.html (8,334 bytes)

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