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Total 156 documents matching your query.

41. Re: [Amps] filament supply d.c. or a.c. (score: 1)
Author: <d.cutter@ntlworld.com>
Date: Thu, 14 Feb 2008 10:23:40 +0000
Working on an army battery set back in the '70's I wondered if polarity would make a difference; I thought that one end would be more biassed than the other wrt grid, but when I reversed the polarity
/archives//html/Amps/2008-02/msg00091.html (8,432 bytes)

42. Re: [Amps] Duration of time delay for soft start (score: 1)
Author: "David Cutter" <d.cutter@ntlworld.com>
Date: Fri, 22 Feb 2008 10:20:18 -0500
Fixed timers I've heard of are around 5s, auto timers can be just a few mains cycles depending on the series resistance and threshold of relays. David G3UNA __________________________________________
/archives//html/Amps/2008-02/msg00150.html (7,814 bytes)

43. Re: [Amps] how to wind an HF broadband 10:1 transformer (score: 1)
Author: "David Cutter" <d.cutter@ntlworld.com>
Date: Fri, 29 Feb 2008 06:08:48 -0500
To improve the range of choices, could the non-linearity introduced by the core be improved by a feedback system ? The Amps archives have ideas which might bear more fruit with modern devices. I dare
/archives//html/Amps/2008-02/msg00215.html (9,439 bytes)

44. Re: [Amps] SB220 power supply (score: 1)
Author: "David Cutter" <d.cutter@ntlworld.com>
Date: Mon, 03 Mar 2008 02:14:36 -0500
Pat There is a recognised way of measuring temperature rise to meet legal requirements, eg UL, CSA, BS etc: the accent is on protection against short from the primary supply to anything else. Leave t
/archives//html/Amps/2008-03/msg00029.html (10,850 bytes)

45. [Amps] IC2KL ACC cable (score: 1)
Author: "David Cutter" <d.cutter@ntlworld.com>
Date: Sat, 08 Mar 2008 11:55:48 -0500
All Need to buy or make the interconnection lead from the amplifier to the tuner (ACC); can anyone help with the connectors, type, where to buy? They look like Molex but I can't figure out the type.
/archives//html/Amps/2008-03/msg00075.html (7,205 bytes)

46. Re: [Amps] Transceiver Output Impedance (score: 1)
Author: "David Cutter" <d.cutter@ntlworld.com>
Date: Sun, 09 Mar 2008 08:18:48 -0500
One of these days I will try the following experiment. I will MAKE a rf signal generator and add resistance in series with it to a load of 50ohms and stop adding resistance when the load voltage is h
/archives//html/Amps/2008-03/msg00091.html (8,445 bytes)

47. [Amps] Refurbishing old amps (score: 1)
Author: "David Cutter" <d.cutter@ntlworld.com>
Date: Fri, 28 Mar 2008 11:26:34 -0500
All What cleaning fluids and treatments should one use or not use when cleaning and polishing old gear? David G3UNA _______________________________________________ Amps mailing list Amps@contesting.c
/archives//html/Amps/2008-03/msg00313.html (7,366 bytes)

48. Re: [Amps] Refurbishing old amps (score: 1)
Author: "David Cutter" <d.cutter@ntlworld.com>
Date: Fri, 28 Mar 2008 14:12:52 -0500
Some excellent advice here but most of the stuff mentioned doesn't ring any bells with me. Perhaps some Brits know equivalents for these. We have WD40 and I've seen MEK at work but not sure I could g
/archives//html/Amps/2008-03/msg00322.html (9,025 bytes)

49. Re: [Amps] Relays (score: 1)
Author: "David Cutter" <d.cutter@ntlworld.com>
Date: Sun, 30 Mar 2008 19:28:10 +0100
Tim Do you ever use foot-operated PTT ? I am always a little suspicious that the brain gets the voice to start before the foot gets the switch to the floor. When ms count, the 11ms from brain to foot
/archives//html/Amps/2008-03/msg00364.html (8,408 bytes)

50. Re: [Amps] Relays (score: 1)
Author: "David Cutter" <d.cutter@ntlworld.com>
Date: Sun, 30 Mar 2008 19:50:14 +0100
Sorry to labour the point, but, how do you guarantee that? Is it a question of operator training? David G3UNA _______________________________________________ Amps mailing list Amps@contesting.com htt
/archives//html/Amps/2008-03/msg00366.html (9,595 bytes)

51. Re: [Amps] Relays (score: 1)
Author: "David Cutter" <d.cutter@ntlworld.com>
Date: Sun, 30 Mar 2008 20:09:21 +0100
Not a nice thing to do in the middle of a contest, though. David G3UNA _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listin
/archives//html/Amps/2008-03/msg00368.html (9,410 bytes)

52. Re: [Amps] Amps Digest, Vol 63, Issue 56 (score: 1)
Author: "David Cutter" <d.cutter@ntlworld.com>
Date: Mon, 31 Mar 2008 23:45:12 +0100
How do you ensure your voice arrives at the right time? David G3UNA _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/
/archives//html/Amps/2008-03/msg00392.html (7,439 bytes)

53. Re: [Amps] Amps Digest, Vol 63, Issue 56 (score: 1)
Author: "David Cutter" <d.cutter@ntlworld.com>
Date: Tue, 1 Apr 2008 07:19:30 +0100
Mike That's interesting. What I mean is, how do you ensure your voice is not cut off if you speak too soon, relative to the transmitter coming on? I presume it's a question of training yourself to sp
/archives//html/Amps/2008-04/msg00002.html (8,810 bytes)

54. Re: [Amps] Relays (score: 1)
Author: <d.cutter@ntlworld.com>
Date: Wed, 2 Apr 2008 10:30:31 +0100
Back in the days of steam radio, didn't we use TR switching using bottles? I seem to remember an 807 used as a switch, but the memory dims and I'm not next to my library to look it up. Do we *have* t
/archives//html/Amps/2008-04/msg00029.html (8,543 bytes)

55. Re: [Amps] Dual power supplies in EB104 4X MRF150 design (score: 1)
Author: <d.cutter@ntlworld.com>
Date: Thu, 10 Apr 2008 03:21:16 -0500
I've often wondered about series connecting switchers. Can the experts tell us if there are any odd start-up conditions that might need attention? I once made a +/- pair of supplies running from the
/archives//html/Amps/2008-04/msg00136.html (11,493 bytes)

56. Re: [Amps] Dual power supplies in EB104 4X MRF150 design (score: 1)
Author: "David Cutter" <d.cutter@ntlworld.com>
Date: Thu, 10 Apr 2008 23:09:50 +0100
Hal Where can we find diagrams and more detail on these systems you describe? They sound quite interesting. David G3UNA -- Original "Whoa, whoa! The Load Sharing system uses the Frame Ground as signa
/archives//html/Amps/2008-04/msg00157.html (9,516 bytes)

57. Re: [Amps] current in primary of microwave oven transformer (score: 1)
Author: <d.cutter@ntlworld.com>
Date: Wed, 23 Apr 2008 03:28:04 -0500
The current you are measuring has a phase angle relative to the mains voltage supplied, meaning this is not real power being consumed it is apparant power, ie not Watts but Volt-amps. You will need a
/archives//html/Amps/2008-04/msg00265.html (8,896 bytes)

58. Re: [Amps] current in primary of microwave oven transformer (score: 1)
Author: <d.cutter@ntlworld.com>
Date: Thu, 24 Apr 2008 12:45:28 +0100
David I don't think that's what Angel measured: I understood it was measured using a regular current meter, therefore the results are VA reactive not Watts. David G3UNA -- Email sent from www.virginm
/archives//html/Amps/2008-04/msg00281.html (12,527 bytes)

59. Re: [Amps] Sheet aluminum (score: 1)
Author: "David Cutter" <d.cutter@ntlworld.com>
Date: Fri, 16 May 2008 05:39:31 +0100
If this is just the rf deck and not containing heavy things like transformers, you will probably do with 2mm thick 6082 for most of the work, unless you are trying to make it as light as possible. If
/archives//html/Amps/2008-05/msg00101.html (8,851 bytes)

60. Re: [Amps] W3NQN band pass filters (score: 1)
Author: <d.cutter@ntlworld.com>
Date: Fri, 13 Jun 2008 13:03:59 +0100
Presumably this is for a contest station. What matters more is the break thro into the other station's rx and this can be strongly influenced by the antenna or input Z of the linear on the filter. It
/archives//html/Amps/2008-06/msg00109.html (10,783 bytes)

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