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41. [AMPS] FAILURE OF PARASITIC RESISTORS IN AL-811X AMPLIFIER (score: 1): Author: itr@nanoteq.co.za (Ian Roberts); Date: Thu, 02 Mar 2000 11:48:59 +0200; the What is the frequency of instability? Therefore what is the reactance? On what grounds is it assumed that there is only one frequency of instability? If the "suppressor" is meant to suppress some; /archives//html/Amps/2000-03/msg00041.html (9,424 bytes)
42. [AMPS] Network analysis of suppressors (score: 1): Author: itr@nanoteq.co.za (Ian Roberts); Date: Fri, 03 Mar 2000 08:24:35 +0200; The component in the B+ chain that arcs is thus the (RF choke?).....? The destruction can be avoided by fusing the B+ chain with a fast blow fuse? Are we sure that these arcs are not simply filth on; /archives//html/Amps/2000-03/msg00079.html (10,377 bytes)
43. [AMPS] 2nd harmonic pumped parasitic (score: 1): Author: itr@nanoteq.co.za (Ian Roberts); Date: Fri, 03 Mar 2000 09:06:06 +0200; John, this is a quality reply to my question about the effect (with the specific reference to harmonics from ham rigs) of harmonics causing oscillation in PAs. The powers that be pooh-poohed this pos; /archives//html/Amps/2000-03/msg00080.html (13,233 bytes)
44. [AMPS] 2nd harmonic pumped parasitic (score: 1): Author: itr@nanoteq.co.za (Ian Roberts); Date: Fri, 03 Mar 2000 11:15:50 +0200; Wow, then all the more reason to await spurious responses (I won't use the word oscillation right now...). Ciao. -- FAQ on WWW: http://www.contesting.com/ampsfaq.html Submissions: amps@contesting.com; /archives//html/Amps/2000-03/msg00089.html (8,238 bytes)
45. [AMPS] 2nd harmonic pumped parasitic (score: 1): Author: itr@nanoteq.co.za (Ian Roberts); Date: Mon, 06 Mar 2000 07:45:02 +0200; Stick to the lossy tungsten, Tom. -- FAQ on WWW: http://www.contesting.com/ampsfaq.html Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.com Problems: owner-amps@cont; /archives//html/Amps/2000-03/msg00211.html (8,039 bytes)
46. [AMPS] reply on connectors and VHF (score: 1): Author: itr@nanoteq.co.za (Ian Roberts); Date: Mon, 06 Mar 2000 08:23:18 +0200; In signal amps, one of the sure signs that a low noise signal amplifier has out of band oscillation, is a poor noise figure, even if the device seems to be delivering rated gain. The principle is id; /archives//html/Amps/2000-03/msg00214.html (8,007 bytes)
47. [AMPS] IMDs (score: 1): Author: itr@nanoteq.co.za (Ian Roberts); Date: Mon, 06 Mar 2000 14:39:38 +0200; It's a pity you didn't rather use the audio gain to set the output at the required PEP? Tests such as this are linked to the old adage "linearity must be maintained", ALC is a form of compression. Po; /archives//html/Amps/2000-03/msg00235.html (8,919 bytes)
48. [AMPS] Re: Re: Mission Impossible (score: 1): Author: itr@nanoteq.co.za (Ian Roberts); Date: Tue, 07 Mar 2000 14:20:53 +0200; What has not been mentioned in this discussion, is the performance of noise blankers on amateur receivers, which when "in", contribute more than their fair share of clicking noises to a strong signal; /archives//html/Amps/2000-03/msg00354.html (8,841 bytes)
49. [AMPS] Re: Re: Mission Impossible (score: 1): Author: itr@nanoteq.co.za (Ian Roberts); Date: Wed, 08 Mar 2000 08:58:41 +0200; Peter, you have received the answer to your posting days ago, the answer is "elbow room". When it is quite acceptable to yell "cq test" on top of someone else, you should be grateful and humble that; /archives//html/Amps/2000-03/msg00434.html (11,021 bytes)
50. SV: [AMPS] Power Handling of Resistors (score: 1): Author: itr@nanoteq.co.za (Ian Roberts); Date: Wed, 08 Mar 2000 09:18:19 +0200; No man, relax! You are too tight! Pose questions such as this (expanding the analogy below): "so a 1/4 W resistor can handle a 5 MW (that's not milli-Watts) pulse if the duty cycle is short enough?"; /archives//html/Amps/2000-03/msg00436.html (10,859 bytes)
51. SV: [AMPS] Re: Re: Mission Impossible (score: 1): Author: itr@nanoteq.co.za (Ian Roberts); Date: Wed, 08 Mar 2000 09:32:14 +0200; For contesters obviously not, they all deserve each other. -- FAQ on WWW: http://www.contesting.com/ampsfaq.html Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.com; /archives//html/Amps/2000-03/msg00439.html (8,037 bytes)
52. [AMPS] Power Handling of Resistors (score: 1): Author: itr@nanoteq.co.za (Ian Roberts); Date: Fri, 10 Mar 2000 08:29:24 +0200; Speaking from memory, I recall that a 1 micro size cap can provide a peak current of 20 amps, therefore 32 micros can provide...? Ian. ZS6BTE -- FAQ on WWW: http://www.contesting.com/ampsfaq.html Sub; /archives//html/Amps/2000-03/msg00526.html (8,642 bytes)
53. [AMPS] Re: Power Handling of Resistors (score: 1): Author: itr@nanoteq.co.za (Ian Roberts); Date: Fri, 10 Mar 2000 08:32:56 +0200; An arc is energy applied to a POINT target, in this case the thin contacts of a bandswitch in the presence of oxygen. We aren't talking about melting down metal ingots here. -- FAQ on WWW: http://www; /archives//html/Amps/2000-03/msg00527.html (8,368 bytes)
54. [AMPS] Power Handling of Resistors (score: 1): Author: itr@nanoteq.co.za (Ian Roberts); Date: Fri, 10 Mar 2000 16:21:48 +0200; (I hope I haven't duped this message). I think you are right and wrong at the same time. The original discussion did relate to the topic above, but your statement was an absolute one unrelated to the; /archives//html/Amps/2000-03/msg00539.html (12,486 bytes)
55. [AMPS] Power Handling of Resistors (score: 1): Author: itr@nanoteq.co.za (Ian Roberts); Date: Fri, 10 Mar 2000 16:24:51 +0200; A capacitor of 220 milli-Farads is assuredly gigantic.. -- FAQ on WWW: http://www.contesting.com/ampsfaq.html Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.com Pro; /archives//html/Amps/2000-03/msg00540.html (8,218 bytes)
56. [AMPS] Rocky Point effects (score: 1): Author: itr@nanoteq.co.za (Ian Roberts); Date: Tue, 14 Mar 2000 12:10:35 +0200; Tom, in the SB 220, how would you suggest warming up the 3-500s, don't have a 1500 Watt load and the max PEP allowed is 400 Watts. Do they have to get "cherry red"? Ian ZS6BTE -- FAQ on WWW: http://w; /archives//html/Amps/2000-03/msg00655.html (9,453 bytes)
57. [AMPS] Receiver performance (score: 1): Author: itr@nanoteq.co.za (Ian Roberts); Date: Tue, 14 Mar 2000 16:05:31 +0200; Is this not the classical definition of diff gain? Or did you mean the wave phase? Is group delay not automatically "differential"? Ciao. Ian ZS6BTE -- FAQ on WWW: http://www.contesting.com/ampsfaq.h; /archives//html/Amps/2000-03/msg00662.html (9,206 bytes)
58. [AMPS] Rocky Point effects (score: 1): Author: itr@nanoteq.co.za (Ian Roberts); Date: Wed, 15 Mar 2000 09:05:00 +0200; Not that I've noticed, also not when at 400 W RTTY or SSTV.. The tubes are new EIMACs, according to the previous owner. On this point, I've always been under the impression that for this box, the SB; /archives//html/Amps/2000-03/msg00688.html (9,202 bytes)
59. [AMPS] Is screen potential important? (score: 1): Author: itr@nanoteq.co.za (Ian Roberts); Date: Thu, 30 Mar 2000 15:31:16 +0200; Seems to me that this beast will do just fine on 100% duty cycle modes: AM, FM and SSB-SSTV, SSB-RTTY, SSB-PSK, but query it's CW and speech-SSB performance? What was it originally mean to do? Ian, Z; /archives//html/Amps/2000-03/msg01079.html (10,814 bytes)
60. [AMPS] Power Supply Diodes (score: 1): Author: itr@nanoteq.co.za (Ian Roberts); Date: Fri, 04 Feb 2000 07:27:03 +0200; Periods are not rated in Siemens... -- FAQ on WWW: http://www.contesting.com/ampsfaq.html Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.com Problems: owner-amps@co; /archives//html/Amps/2000-02/msg00068.html (8,953 bytes)

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