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41. Re: [Amps] Mobile amps (score: 1): Author: Dan Sawyer <dansawyer@earthlink.net>; Date: Fri, 22 Jul 2005 06:59:46 -0700; Will, Is it practical to adapt these to work on 80 through 10 meters? Thanks, Dan _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mai; /archives//html/Amps/2005-07/msg00256.html (7,798 bytes)
42. [Amps] bi-directional coupler question (score: 1): Author: Dan Sawyer <dansawyer@earthlink.net>; Date: Fri, 18 Nov 2005 13:10:31 -0800; All, This journey started several months ago with the purchase on an 8405a to measure an antenna. One of the items listed at that time was a bi-directional coupler. Finally I have found one and am be; /archives//html/Amps/2005-11/msg00324.html (6,872 bytes)
43. Re: [Amps] bi-directional coupler question (score: 1): Author: Dan Sawyer <dansawyer@earthlink.net>; Date: Fri, 18 Nov 2005 18:23:50 -0800; Thank you. The coupler I have is too high frequency for my current needs. I am interested in a 1 to 100 MHz bi-directional coupler. However bi-directional couplers are much less common then uni-direc; /archives//html/Amps/2005-11/msg00331.html (10,232 bytes)
44. [Amps] difference between 2,3,4 and 43, 45, ... materials? (score: 1): Author: Dan Sawyer <dansawyer@earthlink.net>; Date: Sat, 19 Nov 2005 11:49:55 -0800; All, I am constructing a bi-directional coupler according to the notes in the arrl antenna handbook. It calls for a couple of transformers to be build. I have purchased Amadon 'red' cores. (I think p; /archives//html/Amps/2005-11/msg00352.html (6,893 bytes)
45. [Amps] hit a wall on bi-directional couplers (score: 1): Author: Dan Sawyer <dansawyer@earthlink.net>; Date: Sat, 19 Nov 2005 17:58:48 -0800; All, I have hit a wall on bidirectional couplers for HF. I have breadboarded the bi-directional portion of the following attached bi-directional coupler circuit. It appears in principal to be the sam; /archives//html/Amps/2005-11/msg00356.html (7,414 bytes)
46. Re: [Amps] hit a wall on bi-directional couplers (score: 1): Author: Dan Sawyer <dansawyer@earthlink.net>; Date: Sat, 19 Nov 2005 21:29:53 -0800; Mike, Thanks for the reply. The year of the handbook is 1995. There are 2 or 3 examples on bi-directional couplers in the back. The full schematic is on page 35 of the link, however the coupler porti; /archives//html/Amps/2005-11/msg00363.html (10,763 bytes)
47. Re: [Amps] difference between 2,3,4 and 43, 45, ... materials? (score: 1): Author: Dan Sawyer <dansawyer@earthlink.net>; Date: Sun, 20 Nov 2005 11:48:26 -0800; Thanks, Does a quick bench test of winding two coils of equal turns and then driving one with a 50 Ohm sweep generator and terminating the other in 50 Ohms show a good representation of the bandwidth; /archives//html/Amps/2005-11/msg00385.html (7,920 bytes)
48. Re: [Amps] hit a wall on bi-directional couplers (score: 1): Author: Dan Sawyer <dansawyer@earthlink.net>; Date: Sun, 20 Nov 2005 20:25:53 -0800; Bob, Thanks for the detailed reply. My version is the 17th and while the exact figure references are off a little the observations seem relevant. If I read your reply correctly the shields should sep; /archives//html/Amps/2005-11/msg00391.html (10,450 bytes)
49. Re: [Amps] hit a wall on bi-directional couplers (score: 1): Author: Dan Sawyer <dansawyer@earthlink.net>; Date: Mon, 21 Nov 2005 18:41:47 -0800; Bob, Second quick follow up on the role of the Faraday shield. I reviewed a second, 20th addition of the handbook today. The second diagram with the horizontal shield is still, unchanged, in that ver; /archives//html/Amps/2005-11/msg00417.html (10,227 bytes)
50. Re: [Amps] hit a wall on bi-directional couplers (score: 1): Author: Dan Sawyer <dansawyer@earthlink.net>; Date: Tue, 22 Nov 2005 19:56:31 -0800; Thanks again Bob, The explanation of the shield on the primary winding makes sense. I thing that is referred to as a Faraday shield. Your explanation makes sense, it shields the E field but not the H; /archives//html/Amps/2005-11/msg00449.html (14,268 bytes)
51. [Amps] how to connect 8405a probes ? (score: 1): Author: Dan Sawyer <dansawyer@earthlink.net>; Date: Tue, 06 Dec 2005 07:51:11 -0800; All, After much fussing around I finally have a working 8405a. It has normal probes - what slick ways have people come up with to connect these probes? I would like to make a device to connect the pr; /archives//html/Amps/2005-12/msg00046.html (6,331 bytes)
52. [Amps] help diagnosing a bad 8450a probe ? (score: 1): Author: Dan Sawyer <dansawyer@earthlink.net>; Date: Thu, 08 Dec 2005 22:08:02 -0800; All, I have an 8405a with a bad probe. The unit makes it through most of the calibration until the noise cancellation step. One board works and comes in at less then 5 mv. However one shows a 1V peak; /archives//html/Amps/2005-12/msg00100.html (6,605 bytes)
53. Re: [Amps] help diagnosing a bad 8450a probe ? (score: 1): Author: Dan Sawyer <dansawyer@earthlink.net>; Date: Fri, 09 Dec 2005 06:59:26 -0800; Peter - Thank you. Is there a simple way to match them? I have an old Tek curve tracer. Will a simple visual match work? 73 Dan - kb0qil _______________________________________________ Amps mailing l; /archives//html/Amps/2005-12/msg00103.html (8,146 bytes)
54. Re: [Amps] help diagnosing a bad 8450a probe ? (score: 1): Author: Dan Sawyer <dansawyer@earthlink.net>; Date: Fri, 09 Dec 2005 07:11:47 -0800; Steve, I have a cross match for HP2800 and HP2835 to NTE parts 112 and 484, they are available locally. What characteristics should I look for? In this circuit as long as they match will they work in; /archives//html/Amps/2005-12/msg00104.html (9,152 bytes)
55. [Amps] Ouch - 23 Ohms ? (score: 1): Author: Dan Sawyer <dansawyer@earthlink.net>; Date: Sat, 10 Dec 2005 16:17:47 -0800; Ouch. I picked a set of couplers that are apparently not 50 Ohms. They appear to be 23 Ohms. What aspects of the construction would make a coupler 23 Ohms over 50, or for that matter anything else? T; /archives//html/Amps/2005-12/msg00114.html (6,435 bytes)
56. Re: [Amps] Ouch - 23 Ohms ? (score: 1): Author: Dan Sawyer <dansawyer@earthlink.net>; Date: Sun, 11 Dec 2005 08:10:17 -0800; Thank you. The pickup tap reads about 23 Ohms. If I string 6 of them together, out to in, and terminate the last one with 50 Ohms the impedance is about 22 Ohms. The only negative effect is they appe; /archives//html/Amps/2005-12/msg00119.html (9,032 bytes)
57. Re: [Amps] Ouch - 23 Ohms ? (score: 1): Author: Dan Sawyer <dansawyer@earthlink.net>; Date: Sun, 11 Dec 2005 11:11:30 -0800; Thank you. The devices are Mini-Circuits ZFDC-20-5-23. Normally these devices either have no third numeric indicating 50 Ohms, or a 75 indicating 75 Ohms. I am trying to determine both the coupler im; /archives//html/Amps/2005-12/msg00123.html (8,837 bytes)
58. Re: [Amps] Ouch - 23 Ohms ? (score: 1): Author: Dan Sawyer <dansawyer@earthlink.net>; Date: Sun, 11 Dec 2005 11:13:09 -0800; I agree it is confusing. The coupler output reads 23 Ohms with a DVM. If I connect 6 of the devices in to out, terminate the last device in 50 Ohms, and then read the input with an impedance meter, s; /archives//html/Amps/2005-12/msg00124.html (8,995 bytes)
59. [Amps] hp 8405a mostly working - yea!! (score: 1): Author: Dan Sawyer <dansawyer@earthlink.net>; Date: Sat, 17 Dec 2005 16:43:07 -0800; I want to thank many of you for a great deal of help. After more the 6 months, most of which was spent working around the 'white elephant' project in the middle of the bench the 8405a is mostly worki; /archives//html/Amps/2005-12/msg00236.html (8,235 bytes)
60. [Amps] 8405a setup question? (score: 1): Author: Dan Sawyer <dansawyer@earthlink.net>; Date: Mon, 19 Dec 2005 20:08:56 -0800; All, my 8405a is set up and almost perfectly calibrated. Due to a difference in diodes between the probes the sampling efficiency on channel B is just readable less 'efficient' then channel A. The A; /archives//html/Amps/2005-12/msg00272.html (7,430 bytes)

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