Mail Archive Search: <+from:W4EF@dellroy.com>

Results:

References: [ +from:W4EF@dellroy.com: 320 ]

Total 320 documents matching your query.

41. [Amps] Henry 3K-A (score: 1): Author: W4EF@dellroy.com (Mike); Date: Sun, 17 Mar 2002 14:38:19 -0800; What is the anode voltage in the CW and SSB positions? These numbers seem about right for a c. 2500VDC anode supply (SSB position), but would be somewhat low for a c. 3500 VDC anode supply. Mike, W4E; /archives//html/Amps/2002-03/msg00384.html (9,143 bytes)
42. [Amps] SB-220 for WARC bands (score: 1): Author: W4EF@dellroy.com (Mike); Date: Thu, 21 Mar 2002 20:15:40 -0800; I think the Drake L-7 may suffer from the same problem. I decided to check the 30 meter output capability on mine the other day (into a dummy load, of course). Previously I had run the amp over-the-a; /archives//html/Amps/2002-03/msg00494.html (8,695 bytes)
43. [Amps] Re: [Amps] Bird® 43 Manua (score: 1): Author: W4EF@dellroy.com (Mike); Date: Wed, 27 Mar 2002 20:38:54 -0800; The reflected wave combines with the incident wave at the source such that the source sees a mismatched load. Whether the load impedance presented to the source is high or lower than Zo depends on th; /archives//html/Amps/2002-03/msg00637.html (15,354 bytes)
44. [Amps] Re: Bird® 43 Manua (score: 1): Author: W4EF@dellroy.com (Mike); Date: Thu, 28 Mar 2002 04:40:01 -0800; My point is that power dissipation in the source will vary depending on the length of that unterminated line since the actual impedance presented to the final amplifier could be anything on the rim o; /archives//html/Amps/2002-03/msg00644.html (12,013 bytes)
45. [Amps] Re: [Amps] Re: [Amps] Bird® 43 Manua (score: 1): Author: W4EF@dellroy.com (Mike); Date: Thu, 28 Mar 2002 09:35:20 -0800; is zero-resistance shorted across it's terminals? Either in the battery or the engine of the ambulance :) the absence of a transmission line or load? In the rig; /archives//html/Amps/2002-03/msg00662.html (8,650 bytes)
46. [Amps] Re: Bird® 43 Manua (score: 1): Author: W4EF@dellroy.com (Mike); Date: Thu, 28 Mar 2002 10:29:31 -0800; I would disagree. Power is reflected in a mismatched transmission line. Send a short RF pulse down a long transmission line with a mismatch at the end, and then switch in a 50 ohm load at the source; /archives//html/Amps/2002-03/msg00665.html (12,938 bytes)
47. [Amps] Re: [Amps] Re: [Amps] Bird® 43 Manua (score: 1): Author: W4EF@dellroy.com (Mike); Date: Thu, 28 Mar 2002 18:42:31 -0800; I take issue with the assertion that power is a scalar quantity that can't have a direction. It is no more scalar than voltage or current (they all have a sign associated with them, but none of them; /archives//html/Amps/2002-03/msg00674.html (12,167 bytes)
48. [AMPS] RCD HV Resistors from Ameritron (score: 1): Author: W4EF@dellroy.com (Mike); Date: Fri, 1 Feb 2002 09:50:01 -0800; I bought some RCD175P 10 Ohm/10 Watt "High Voltage" resistors from Ameritron. Does anyone know what the voltage and pulse rating is for these parts? Per the RCD website, they look like they might be; /archives//html/Amps/2002-02/msg00007.html (6,746 bytes)
49. [AMPS] I did a dumb thing! (score: 1): Author: W4EF@dellroy.com (Mike); Date: Fri, 4 Jan 2002 02:17:15 -0800; Would there be any long term detrimental effect of running very high filament voltage on 3-500Z for a few seconds. I was testing a Drake L-7 here and forgot to jumper the filament transformer for 240; /archives//html/Amps/2002-01/msg00044.html (7,497 bytes)
50. [AMPS] Re: AL1500 problem (score: 1): Author: W4EF@dellroy.com (Mike); Date: Thu, 20 Dec 2001 11:32:26 -0800; Jose', You may have already done this, but a good test to isolate problems in the amplifier from the exciter is to key the amplifier manually using a shorting plug installed in the amplifier's T/R co; /archives//html/Amps/2001-12/msg00401.html (12,760 bytes)
51. [AMPS] Power problems on 10/15 Meters HF2500 (score: 1): Author: W4EF@dellroy.com (Mike); Date: Sat, 3 Nov 2001 23:14:20 -0800; Hi Rich, What happens if you put the exciter in transmit mode by closing the PTT line prior to applying RF? We had a similar problem using the FT-1000D driving an Ameritron AL-82 (slow buildup from a; /archives//html/Amps/2001-11/msg00028.html (9,565 bytes)
52. [AMPS] another myth on EMF (score: 1): Author: W4EF@dellroy.com (Mike); Date: Mon, 5 Nov 2001 21:49:21 -0800; Bravo, John! Very well stated. This emotionally loaded topic seems to surface from time-to-time on the various reflectors with the usual one-sided political knee-jerking coming from both sides of the; /archives//html/Amps/2001-11/msg00062.html (11,939 bytes)
53. [AMPS] TS-940 and SB-200 (score: 1): Author: W4EF@dellroy.com (Mike); Date: Tue, 27 Nov 2001 19:14:25 -0800; This is a multi-part message in MIME format. --=_NextPart_000_00B5_01C17777.BA744480 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi Barry,=20 Try connec; /archives//html/Amps/2001-11/msg00449.html (13,116 bytes)
54. [AMPS] Another Stupid Question (score: 1): Author: W4EF@dellroy.com (Mike); Date: Thu, 29 Nov 2001 00:47:22 -0800; Isn't there also the issue of the current rating of the blocking cap? At higher frequencies, the tubes stray C can carry quite a bit RF circulating current, thus the tank will draw an equivalent amou; /archives//html/Amps/2001-11/msg00475.html (11,336 bytes)
55. [AMPS] Filament resistance and power output (score: 1): Author: Mike" <W4EF@dellroy.com (Mike); Date: Wed, 10 Oct 2001 17:35:44 -0700; Hi Pete, Filament current on the 3-500Z is around 15 amps per tube. Fourty millohms (.04 ohms) of contact resistance, for instance, is enough to drop the filament voltage by 0.6 volts, or 12% of the; /archives//html/Amps/2001-10/msg00277.html (9,418 bytes)
56. [AMPS] AL-82 Primary Tap Settings (score: 1): Author: Mike" <W4EF@dellroy.com (Mike); Date: Wed, 17 Oct 2001 06:43:56 -0700; Hi All, We have 3 Ameritron AL-82's at our local club station. The station was recently moved into a new shack which is wired with one phase of a 3 phase 208 VAC service (the old shack was setup for; /archives//html/Amps/2001-10/msg00356.html (7,872 bytes)
57. [AMPS] Alpha question (score: 1): Author: Mike" <W4EF@dellroy.com (Mike); Date: Wed, 17 Oct 2001 20:59:02 -0700; Hi Jack, A single 1/4 wave stub made from low-loss coax will give you between 20 and 25 dB of attenuation when properly adjusted. If the second station doesn't shut down the amp on the first station; /archives//html/Amps/2001-10/msg00370.html (10,154 bytes)
58. [AMPS] transformer oil (score: 1): Author: Mike" <W4EF@dellroy.com (Mike); Date: Sun, 30 Sep 2001 18:32:06 -0700; This is a multi-part message in MIME format. --=_NextPart_000_0109_01C149DE.35658EA0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Ken,=20 You can buy tra; /archives//html/Amps/2001-09/msg00003.html (15,120 bytes)
59. [AMPS] Band Switch Stop on Drake L-7 (score: 1): Author: Mike" <W4EF@dellroy.com (Mike); Date: Mon, 3 Sep 2001 06:35:19 -0700; I started the process of adding 10 meter capability to my Drake L-7 this morning. The first step, removing the low-pass filter in front of the tuned input, was quite easy. The next step, removing the; /archives//html/Amps/2001-09/msg00033.html (7,043 bytes)
60. [AMPS] SB-1000 mods? (score: 1): Author: Mike" <W4EF@dellroy.com (Mike); Date: Fri, 7 Sep 2001 18:43:10 -0700; Hi Tom, Is there any reason that a glitch resistor is preferred over a fuse in the anode lead. I opened up my L-7 power supply last night and found that someone had replaced the 0.82 ohm glitch resis; /archives//html/Amps/2001-09/msg00114.html (10,028 bytes)

Current List: 41 - 60
Page: [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16]