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1. [AMPS] Properties of plastics at 10 GHz (score: 1): Author: ggeurts@amp.com (Geurts, Gerard); Date: Thu, 13 Aug 1998 09:09:21 +0100; Jon replied: I hate to say it, but Rich is right on this one. The problem very often is that Jon does not read the original messages properly. In this case, Rich never said that the styrofoam heats u; /archives//html/Amps/1998-08/msg00114.html (10,119 bytes)
2. [AMPS] Kenwood TS450 & SB-200?? (score: 1): Author: ggeurts@amp.com (Geurts, Gerard); Date: Mon, 17 Aug 1998 08:29:59 +0100; I did some similar measurements on a IC709 some time ago to use it with a QSK amplifier. Used the key line to trigger the scope. From memory it took a few ms for the amplifier key line to switch, and; /archives//html/Amps/1998-08/msg00160.html (10,178 bytes)
3. FW: [AMPS] Kenwood TS450 & SB-200?? (score: 1): Author: ggeurts@amp.com (Geurts, Gerard); Date: Mon, 17 Aug 1998 17:01:34 +0100; I think this didn't get out earlier. if you get this e-mail twice please accept my apologies. Gerard -- FAQ on WWW: http://www.contesting.com/ampfaq.html Submissions: amps@contesting.com Administrati; /archives//html/Amps/1998-08/msg00161.html (10,533 bytes)
4. [AMPS] Thanks for SB-1000 help! (score: 1): Author: ggeurts@amp.com (Geurts, Gerard); Date: Tue, 9 Jun 1998 08:09:57 +0100; Vic, I hope you are not into CW contesting. A vacuum relay has a life of about 2 million operations. A serious CW contester will wear it out in 6 days! And that is when the relay was purchased new. C; /archives//html/Amps/1998-06/msg00119.html (7,031 bytes)
5. [AMPS] Vacuum relays (score: 1): Author: ggeurts@amp.com (Geurts, Gerard); Date: Tue, 9 Jun 1998 10:24:34 +0100; I didn't come up with the 2 million number Rich, you did. I posted a very simple calculation on the reflector on the 11th of February. In case you forgot, here it is again: Let us assume: * 50 % TX/R; /archives//html/Amps/1998-06/msg00123.html (10,077 bytes)
6. [AMPS] Re: (score: 1): Author: ggeurts@amp.com (Geurts, Gerard); Date: Wed, 17 Jun 1998 15:16:58 +0100; Resistors don't create resonances No, suppressors are there to prevent resonances, not to create them Some of us wonder if Rich understands himself what he is trying to say Cheers Gerard M0AIU / AA3; /archives//html/Amps/1998-06/msg00182.html (8,440 bytes)
7. [AMPS] Another arc question (score: 1): Author: ggeurts@amp.com (Geurts, Gerard); Date: Thu, 7 May 1998 15:39:39 +0100; Your amp was not in cutoff. Unless you call 50 mA plate current 'cutoff'. When this event happened your amp was biased in the 'active region'. What are you trying to proof? I thought the whole idea o; /archives//html/Amps/1998-05/msg00087.html (11,912 bytes)
8. [AMPS] Another arc question (score: 1): Author: ggeurts@amp.com (Geurts, Gerard); Date: Thu, 7 May 1998 16:59:38 +0100; Yep, or maybe something like 50 micro-A in real life. Certainly not 50 mA. In a typical amateur radio GG amplifier a series resistor is used to provide 'cut off bias'. This can of course only work if; /archives//html/Amps/1998-05/msg00090.html (12,052 bytes)
9. [AMPS] Another arc question (score: 1): Author: ggeurts@amp.com (Geurts, Gerard); Date: Fri, 8 May 1998 08:44:02 +0100; Interesting you bring this up. You used Wes' tests many times in your mails to the reflector, and even used to have a link on your web pages to his web site. Interesting enough, that link has now gon; /archives//html/Amps/1998-05/msg00099.html (11,353 bytes)
10. [AMPS] Another arc question (score: 1): Author: ggeurts@amp.com (Geurts, Gerard); Date: Mon, 11 May 1998 13:36:56 +0100; A true story, draw your own conclusions. For some reason I remembered this when I came into the office this morning and had a look through the e-mails that came in over the weekend: About twelve year; /archives//html/Amps/1998-05/msg00154.html (9,904 bytes)
11. [AMPS] Parasitics (score: 1): Author: ggeurts@amp.com (Geurts, Gerard); Date: Thu, 21 May 1998 14:41:06 +0100; I admire your persistence Ian, but why are you trying to change his mind with facts? Cheers Gerard, MoAIU -- FAQ on WWW: http://www.contesting.com/ampfaq.html Submissions: amps@contesting.com Adminis; /archives//html/Amps/1998-05/msg00422.html (8,511 bytes)
12. [AMPS] More amplifier experiments (score: 1): Author: ggeurts@amp.com (Geurts, Gerard); Date: Fri, 29 May 1998 15:45:53 +0100; Indeed, why would this resistor have to be non-inductive? Some people use resistive inductors to improve their surpressors, so why not use inductive resistors? From a circuit analysis point of view a; /archives//html/Amps/1998-05/msg00640.html (10,422 bytes)
13. [AMPS] More amplifier experiments (score: 1): Author: ggeurts@amp.com (Geurts, Gerard); Date: Fri, 29 May 1998 16:07:22 +0100; This 60 nH is the series-inductance (Ls) of the resistor, not the parallel-inductance (Lp). You need to calculate the (frequency dependent) parallel equivalent first before you start paralleling the; /archives//html/Amps/1998-05/msg00642.html (9,916 bytes)
14. [AMPS] A "no tune" amplifier output section/operation question. (score: 1): Author: ggeurts@amp.com (Geurts, Gerard); Date: Tue, 7 Apr 1998 09:12:50 +0100; Skip, There is only one way I know to make a no-tune tube amplifier, and that is by making a so called distributed amplifier. In this configuration a large number of tubes, normally tetrodes, are con; /archives//html/Amps/1998-04/msg00046.html (11,293 bytes)
15. [AMPS] A "no tune" amplifier output section/operation question. (score: 1): Author: ggeurts@amp.com (Geurts, Gerard); Date: Wed, 8 Apr 1998 07:50:40 +0100; I would like to see the calculations. As I said before, the effect of 20 pF at 2500 Ohms is a bit bigger than 5 pF at 5 Ohms. It is this high impedance / high capacitance combination that makes broa; /archives//html/Amps/1998-04/msg00060.html (7,984 bytes)
16. [AMPS] parasitics (score: 1): Author: ggeurts@amp.com (Geurts, Gerard); Date: Thu, 30 Apr 1998 08:49:45 +0100; A HAM radio magazine is not a 'reputable journal' as far as 'real' engineers are concerned. Why don't you try the IEEE Broadcasting Society? Cheers Gerard -- FAQ on WWW: http://www.contesting.com/am; /archives//html/Amps/1998-04/msg00341.html (8,413 bytes)
17. [AMPS] Re: Input Impedance. (score: 1): Author: ggeurts@amp.com (Geurts, Gerard); Date: Tue, 24 Mar 1998 13:29:19 -0000; Snip ..... Snip ..... So which one is it? Snip ..... I wouldn't substitute, but put in parallel. Snip ..... Shakespeare Gerard, AA3ES -- FAQ on WWW: http://www.contesting.com/ampfaq.html Submissions:; /archives//html/Amps/1998-03/msg00381.html (8,027 bytes)
18. [AMPS] Re: Input Impedance. (score: 1): Author: ggeurts@amp.com (Geurts, Gerard); Date: Tue, 24 Mar 1998 14:34:01 -0000; Yes it does. There are capacitances which are formed by the physical structure of the tube. Take out your capacitance meter and try it. They will effect the adjustment of the input network. The effe; /archives//html/Amps/1998-03/msg00384.html (8,138 bytes)
19. [AMPS] Re: Input Impedance. (score: 1): Author: ggeurts@amp.com (Geurts, Gerard); Date: Tue, 24 Mar 1998 16:59:07 -0000; hi all, this has the correct units (ohms) at least and this has the units of potential (volts), not impedance! 73, George T. Daughters, K6GT Your SWR does not change enough to see it because as you l; /archives//html/Amps/1998-03/msg00392.html (8,889 bytes)
20. [AMPS] RF Chokes (score: 1): Author: ggeurts@amp.com (Geurts, Gerard); Date: Fri, 27 Mar 1998 15:34:40 -0000; Or test using a resistor plate to ground, no DC, RFC not connected or maybe even not present. Measure return loss at antenna port, tune circuit for desired frequency, connect RFC. The only thing you; /archives//html/Amps/1998-03/msg00451.html (8,307 bytes)

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