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1. [AMPS] SB-220 Problem (score: 1): Author: ITR@Nanoteq.co.za (Ian Roberts); Date: Fri, 05 Jan 2001 12:03:34 +0200; Pat, according to my recent similar experiences, the band switch is now intermittent and making poor contact, probably due to old age, and is about to fail... The variable does tend to arc under thes; /archives//html/Amps/2001-01/msg00158.html (7,802 bytes)
2. [AMPS] Eimac - Care and Feeding of fragile egos (score: 1): Author: ITR@Nanoteq.co.za (Ian Roberts); Date: Mon, 08 Jan 2001 09:12:01 +0200; As I remember, Bill Gates never did complete his university degree, he dropped out to present an operating system called Disk Operating System to IBM which was developing a device called a Personal C; /archives//html/Amps/2001-01/msg00264.html (10,658 bytes)
3. [AMPS] TX lock-up on Mirage D-1010-N (score: 1): Author: ITR@Nanoteq.co.za (Ian Roberts); Date: Mon, 08 Jan 2001 16:32:37 +0200; This is a 13.8 V 100 Watt 70 cm solid state linear acquired new over the weekend. The device is most reluctant to drop the rx/tx and bias relays after the exciter has been switched to RX, and continu; /archives//html/Amps/2001-01/msg00271.html (8,394 bytes)
4. [AMPS] Care and Feeding of fragile egos (score: 1): Author: ITR@Nanoteq.co.za (Ian Roberts); Date: Tue, 09 Jan 2001 07:49:17 +0200; Jim, you have confirmed what most of us older types have long suspected - it is not what you know that is important, but who you know. That is the modus operandi of man, the herd animal. Ciao, Ian ZS; /archives//html/Amps/2001-01/msg00308.html (13,287 bytes)
5. [AMPS] MGF1502 (score: 1): Author: ITR@Nanoteq.co.za (Ian Roberts); Date: Thu, 11 Jan 2001 07:51:17 +0200; Re you sure this is not a MGF1302 (or compatible with), which is a standard style, cheapie GaAsFET? Ian ZS6BTE -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Admin; /archives//html/Amps/2001-01/msg00335.html (6,809 bytes)
6. [AMPS] re: TX lock-up in Mirage D-1010-N 100 W 70 cm amp (score: 1): Author: ITR@Nanoteq.co.za (Ian Roberts); Date: Mon, 15 Jan 2001 08:58:53 +0200; To round off this discussion: The amp's biasing was found to be far too high on the bases of the driver and final stages. This was causing excessive dissipation in addition to allowing the amp to sel; /archives//html/Amps/2001-01/msg00355.html (8,216 bytes)
7. [AMPS] Output Pulse from ICOM 706 (score: 1): Author: ITR@Nanoteq.co.za (Ian Roberts); Date: Tue, 16 Jan 2001 08:51:53 +0200; This has smacked it on the head; DSP in the ham context has to be seen as cheap and nasty and a sales gimmick. High Q crystal filters remain expensive, while multi-mode, multi-bandwidth DSP can be i; /archives//html/Amps/2001-01/msg00372.html (9,537 bytes)
8. [AMPS] Output Pulse from ICOM 706 (score: 1): Author: ITR@Nanoteq.co.za (Ian Roberts); Date: Wed, 17 Jan 2001 12:04:47 +0200; Tom, I'm not sure I used the correct terminolgy here in this context ("ringing"). Ringing, as I understand it, is repetition of the basic response of the filter at harmonics of the filter's centre fr; /archives//html/Amps/2001-01/msg00406.html (11,695 bytes)
9. SV: [AMPS] SB-220 Glitch Resistor ??? (score: 1): Author: ITR@Nanoteq.co.za (Ian Roberts); Date: Fri, 01 Dec 2000 08:00:56 +0200; Presumably there are two possible places to insert the resistor: in the HT a.c. lead right out of the transformer, thus protecting everything including the bridge rectifier and caps, or immediately b; /archives//html/Amps/2000-12/msg00000.html (7,851 bytes)
10. SV: [AMPS] SB-220 Glitch Resistor ??? (score: 1): Author: ITR@Nanoteq.co.za (Ian Roberts); Date: Fri, 01 Dec 2000 08:15:07 +0200; There is a common misconception that air has good dielectric (insulation) properties. For example, the PTFE glove our wives slip over the iron is good for a few kV provided it is not punctured, altho; /archives//html/Amps/2000-12/msg00001.html (10,897 bytes)
11. SV: [AMPS] Portable linear using a DAF? (score: 1): Author: ITR@Nanoteq.co.za (Ian Roberts); Date: Wed, 01 Nov 2000 07:57:37 +0200; I'm talking about both, the early ICOM switchers were internal types. According to a friend who had a rig fitted with one of these internal types, it ran hot and there were birdies. Eventually he too; /archives//html/Amps/2000-11/msg00003.html (6,629 bytes)
12. [AMPS] Floating Grids (score: 1): Author: ITR@Nanoteq.co.za (Ian Roberts); Date: Mon, 06 Nov 2000 10:43:38 +0200; Presumably any bypass caps become more reactive with increasing frequency, rendering the bypassing less effective anyway. Ian ZS6BTE -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amp; /archives//html/Amps/2000-11/msg00067.html (7,900 bytes)
13. [AMPS] Two Tone 2000 (score: 1): Author: ITR@Nanoteq.co.za (Ian Roberts); Date: Tue, 07 Nov 2000 09:15:27 +0200; The Windows-based software SpectraLab has a generator function which allows up to 10 user defined audio tones to be activated, at user selectable levels. Output via sound card. For dynamic intermod t; /archives//html/Amps/2000-11/msg00080.html (8,107 bytes)
14. [AMPS] Hi Power Connectors (score: 1): Author: ITR@Nanoteq.co.za (Ian Roberts); Date: Wed, 22 Nov 2000 07:52:56 +0200; The term "UHF" is a complete misnomer in discussing these connectors. They are strictly HF devices. VSR above around 140 MHz is too high. The better types use PTFE, bakelite or similar insulation (wo; /archives//html/Amps/2000-11/msg00278.html (9,566 bytes)
15. [AMPS] Hi Power Connectors (score: 1): Author: ITR@Nanoteq.co.za (Ian Roberts); Date: Wed, 22 Nov 2000 11:51:34 +0200; I had always assumed this fact resulted from commercial imperatives rather than engineering ones. I had a look in the Suhner catalogue: Impedance - "undefined" Working voltage - 750 v Test voltage 25; /archives//html/Amps/2000-11/msg00281.html (10,522 bytes)
16. [AMPS] Hi Power Connectors (score: 1): Author: ITR@Nanoteq.co.za (Ian Roberts); Date: Wed, 22 Nov 2000 15:34:15 +0200; This is true, one can "patch" any impedance back to nominal, but there are losses, and the system goes narrow-band. Ian ZS6BTE -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@cont; /archives//html/Amps/2000-11/msg00291.html (10,029 bytes)
17. [AMPS] connectors and spark plugs (score: 1): Author: ITR@Nanoteq.co.za (Ian Roberts); Date: Thu, 23 Nov 2000 09:51:56 +0200; Half of the problem with break down of cinnectors is probably contamination of the dielectric with solder flux/vapours when soldering, or the centre pin with solder itself. Hams, and some professiona; /archives//html/Amps/2000-11/msg00327.html (8,762 bytes)
18. [AMPS] MFJ-259B Question (score: 1): Author: ITR@Nanoteq.co.za (Ian Roberts); Date: Thu, 12 Oct 2000 09:59:14 +0200; The MFJ DSP filter box purchased from HRO works fine here after a few years. The DSP device is the cheapest available, but all parameters are more or less per spec. At the end of the day the idea is; /archives//html/Amps/2000-10/msg00207.html (9,676 bytes)
19. [AMPS] Switches (score: 1): Author: ITR@Nanoteq.co.za (Ian Roberts); Date: Thu, 12 Oct 2000 16:58:20 +0200; May I answer this one on his behalf? 1. Fish food. 2. Polly pooh. 3. Various other contaminants that break down the insulating properties of high voltage devices, especially when some heat is involve; /archives//html/Amps/2000-10/msg00233.html (8,746 bytes)
20. [AMPS] a sticky issue. (score: 1): Author: ITR@Nanoteq.co.za (Ian Roberts); Date: Mon, 16 Oct 2000 09:28:33 +0200; Rich, they're ganging up on u again, obviously their filtering technology is not up to snuff... Nothing nicer than a vigorous debate: if a few verbal "5's" are thrown one is assured that the content; /archives//html/Amps/2000-10/msg00357.html (9,429 bytes)

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