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81. [AMPS] HT "snaps" in SB220 (score: 1): Author: itr@nanoteq.co.za (Ian Roberts); Date: Fri, 19 Nov 1999 08:22:45 +0200; My SB220 occasionally has an audible HT short, consisting of a single pulse, very intermittent, possibly not for a month or three at a time and always when the rig is not key-down. And only in SSB mo; /archives//html/Amps/1999-11/msg00409.html (7,524 bytes)
82. [AMPS] NO NEWS FROM KM1H (score: 1): Author: itr@nanoteq.co.za (Ian Roberts); Date: Tue, 30 Nov 1999 10:29:48 +0200; This is a pathetic story, bad for international business, and international relations. The original complainant should appeal the the United Nations for help, if that august body is unable to assist,; /archives//html/Amps/1999-11/msg00556.html (8,854 bytes)
83. [AMPS] Isolator - Uncle ! (score: 1): Author: itr@nanoteq.co.za (Ian Roberts); Date: Tue, 12 Oct 1999 15:25:18 +0200; Phil, we're still only half way there on this issue! An isolator is a device used to force a required impedance on the input or output circuits of typically, active devices such as GaAsFETS, used in; /archives//html/Amps/1999-10/msg00398.html (8,366 bytes)
84. [AMPS] More Relevant SWR FINAL EXAM (score: 1): Author: itr@nanoteq.co.za (Ian Roberts); Date: Wed, 13 Oct 1999 07:49:45 +0200; Rich, rather ask this question, to floor the guy: "what is the characteristic impedance of waveguide?" Ian ZS6BTE -- FAQ on WWW: http://www.contesting.com/ampsfaq.html Submissions: amps@contesting.co; /archives//html/Amps/1999-10/msg00420.html (9,379 bytes)
85. [AMPS] More Relevant SWR FINAL EXAM (score: 1): Author: itr@nanoteq.co.za (Ian Roberts); Date: Wed, 13 Oct 1999 07:56:44 +0200; Haw haw Ian ZS6BTE -- FAQ on WWW: http://www.contesting.com/ampsfaq.html Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.com Problems: owner-amps@contesting.com Sear; /archives//html/Amps/1999-10/msg00421.html (8,978 bytes)
86. [AMPS] You gotta read this.... (score: 1): Author: itr@nanoteq.co.za (Ian Roberts); Date: Thu, 14 Oct 1999 15:16:07 +0200; These boys were putting mean SSTV signals into South Africa the other day on 27 MHz, now I know how! Ian ZS6BTE -- FAQ on WWW: http://www.contesting.com/ampsfaq.html Submissions: amps@contesting.com; /archives//html/Amps/1999-10/msg00445.html (8,462 bytes)
87. R: [AMPS] L-Pi net...downside? (score: 1): Author: itr@nanoteq.co.za (Ian Roberts); Date: Tue, 03 Aug 1999 13:46:22 +0200; Hams are meant to use grip-dip meters and not worry about "Q" factors. On the input circuit (amp "OFF"!), get the deepest dip (check the harmonic response), on the output circuit, check for dips acro; /archives//html/Amps/1999-08/msg00066.html (9,724 bytes)
88. [AMPS] Re:(AMPS) sb-200 troubles (score: 1): Author: itr@nanoteq.co.za (Ian Roberts); Date: Thu, 12 Aug 1999 09:06:17 +0200; Anyone using a PA on an antenna without DC grounded driven element is certifiable. The antenna ground MUST be in parallel with the shack's mains earth. This lets one off the hook regarding the protec; /archives//html/Amps/1999-08/msg00228.html (10,506 bytes)
89. [AMPS] Safety RF choke (score: 1): Author: itr@nanoteq.co.za (Ian Roberts); Date: Thu, 12 Aug 1999 09:19:26 +0200; This is an excellent idea, but is incomplete in engineering detail. The "trap" must be tuned to the harmonic. Reactance is generated at the fundamental frequency, which must be compensated for using; /archives//html/Amps/1999-08/msg00229.html (8,362 bytes)
90. [AMPS] Re:(AMPS) sb-200 troubles (score: 1): Author: itr@nanoteq.co.za (Ian Roberts); Date: Fri, 13 Aug 1999 09:50:32 +0200; This debate has served to illustrate the poor understanding most hams have regarding the difference between static build-up on an antenna, and EMP effects caused by lightning strikes or "swipes". Sta; /archives//html/Amps/1999-08/msg00247.html (16,100 bytes)
91. [AMPS] 4cx10000/imd/sunits/splatter etc (score: 1): Author: itr@nanoteq.co.za (Ian Roberts); Date: Mon, 12 Jul 1999 15:40:04 +0200; Peter, please help me: Why? Do you mean tailoring the gain to go down with increasing intercept? A received noise floor specified as a power does not correspond to any receiver noise figure. For exam; /archives//html/Amps/1999-07/msg00207.html (12,163 bytes)
92. [AMPS] SB220 problem (score: 1): Author: itr@nanoteq.co.za (Ian Roberts); Date: Tue, 13 Jul 1999 12:01:08 +0200; Tom, on the SB220, which direction is "open"? 73, Ian. -- FAQ on WWW: http://www.contesting.com/ampfaq.html Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.com Probl; /archives//html/Amps/1999-07/msg00235.html (7,398 bytes)
93. [AMPS] G2DAF (score: 1): Author: itr@nanoteq.co.za (Ian Roberts); Date: Thu, 15 Jul 1999 09:35:23 +0200; Chris, thanks for balancing this mixer. Seems that the big problem is the biasing system, surely the various mudsuckers can unlock there minds sufficiently to do a few mods on their rigs? Ian ZS6BTE; /archives//html/Amps/1999-07/msg00295.html (8,138 bytes)
94. [AMPS] equalizing resistors/caps on small HV power supply?? (score: 1): Author: itr@nanoteq.co.za (Ian Roberts); Date: Tue, 27 Jul 1999 10:38:12 +0200; Could someone please enlarge on the procedure of matching diodes, using simple multimeters, etc.? Thanks, Ian ZS6BTE -- FAQ on WWW: http://www.contesting.com/ampfaq.html Submissions: amps@contesting.; /archives//html/Amps/1999-07/msg00509.html (9,302 bytes)
95. [AMPS] Re: (score: 1): Author: itr@nanoteq.co.za (Ian Roberts); Date: Tue, 27 Jul 1999 15:22:10 +0200; With any voltage-measuring device along a transmission line, there is ambiguity regarding the possibility of placing the probe at a voltage minimum instead of at a voltage maximum (which is presumabl; /archives//html/Amps/1999-07/msg00518.html (10,310 bytes)
96. [AMPS] IMD & Phase noise (score: 1): Author: itr@nanoteq.co.za (Ian Roberts); Date: Fri, 04 Jun 1999 09:08:08 +0200; Why don't these guys perfect the last version, why "new" every time? The IC-746 I bought locally (it was one of the first batch sent out world-wide by ICOM to gather user feedback and test reports,; /archives//html/Amps/1999-06/msg00103.html (8,409 bytes)
97. [AMPS] slam tally (score: 1): Author: itr@nanoteq.co.za (Ian Roberts); Date: Thu, 10 Jun 1999 08:47:11 +0200; Gentlemen, A engineer/technician, whatever grade, is ideally placed to speak or write with authority on de-oscillating a recalcitrant PA. A managerial employee spends most of his time pretending to s; /archives//html/Amps/1999-06/msg00332.html (8,573 bytes)
98. [AMPS] parasites prove it? (score: 1): Author: itr@nanoteq.co.za (Ian Roberts); Date: Fri, 11 Jun 1999 14:38:00 +0200; Has anyone tried lining the input or output cavities of PAs with the "lossy" material used in anechioc chambers to suppress RF reflections? The effect is to reduce the "Q" of the cavity, so that inst; /archives//html/Amps/1999-06/msg00376.html (8,602 bytes)
99. [AMPS] 3CX800 (score: 1): Author: itr@nanoteq.co.za (Ian Roberts); Date: Thu, 17 Jun 1999 09:28:39 +0200; One of the better articles on using/making a PA appeared in VHF Communications 4/1985 by DJ4GC "Two-metre Power Amplifier using Valve 4 CX 1000 A" and "Power Amplifiers - How they are operated" with; /archives//html/Amps/1999-06/msg00486.html (9,244 bytes)
100. [AMPS] RF Concepts Amplifier Question (score: 1): Author: itr@nanoteq.co.za (Ian Roberts); Date: Thu, 17 Jun 1999 09:58:28 +0200; I had this exact problem with a Motorola design for 70 cm using MRF309's and offered as a kit by Communication Concepts Inc. Initial power was 20 W instead of the target 100 W! Remedy: Solder trimmer; /archives//html/Amps/1999-06/msg00487.html (10,402 bytes)

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