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1. [Amps] Pacemakers (score: 1): Author: G3rzp@aol.com; Date: Wed, 17 Nov 2004 09:11:54 EST; Professionally, I am somewhat on the periphery of this, being very heavily involved with designing radios to go in pacemakers Firstly, there was an article a good few years ago (late 1980's) in RF De; /archives//html/Amps/2004-11/msg00247.html (8,624 bytes)
2. Re: [Amps] tube flatulence - gettering (score: 1): Author: G3rzp@aol.com; Date: Fri, 19 Nov 2004 13:40:50 EST; I've usually founds that a blue glow inside the envelope isn't a problem - it's some sort of flourescence. Some brands of 807s seemed to do it more than others. 73 Peter G3RZP _______________________; /archives//html/Amps/2004-11/msg00285.html (7,103 bytes)
3. Re: [Amps] tube flatulence - gettering (score: 1): Author: G3rzp@aol.com; Date: Fri, 19 Nov 2004 13:46:43 EST; I've seen receiving tubes ( power tubes - 6V6 size) with perfectly silver getter coating on the glass, but a blue glow between the electrodes with volts on - a sure sign of gassiness. I've also seen; /archives//html/Amps/2004-11/msg00287.html (7,466 bytes)
4. Re: [Amps] Trio TL-922 Filament Transformer... (score: 1): Author: G3rzp@aol.com; Date: Sat, 20 Nov 2004 06:46:21 EST; Since T2 is unfused, if one of the tubes grid-filament shorts, the +110vdc cutoff-bias supply that is powered by the 80Vrms winding on T2 sees a short In my innocence, I would say that's bad design.; /archives//html/Amps/2004-11/msg00321.html (7,644 bytes)
5. Re: [Amps] Advice on instruments for ham use (score: 1): Author: G3rzp@aol.com; Date: Tue, 23 Nov 2004 17:06:30 EST; I would be a bit leary of a digital scope. the reason for that is that if you put ina well modulated RF signal, the possibilities of aliasing are frightening. I demo'd this to a HP rep - a 500 Megasa; /archives//html/Amps/2004-11/msg00401.html (8,597 bytes)
6. Re: [Amps] Advice on instruments for ham use (score: 1): Author: G3rzp@aol.com; Date: Thu, 25 Nov 2004 06:17:16 EST; In our Swedish lab, we have one of these super duper digital scopes from le Croix (sp?) that can look at 2.5GHz sine waves. It still can get confused by 90% modulated RF signals. Mind you, if you're; /archives//html/Amps/2004-11/msg00425.html (8,683 bytes)
7. Re: [Amps] Advice on instruments for ham use (score: 1): Author: G3rzp@aol.com; Date: Thu, 25 Nov 2004 16:20:47 EST; That is a joy to use. If you have a lot of spare change around, buy yourself a nice spectrum analyzer for Christmas Spectrum analysers can also lie like personnel managers. They also tell you things; /archives//html/Amps/2004-11/msg00429.html (8,865 bytes)
8. Re: [Amps] Advice on instruments for ham use (score: 1): Author: G3rzp@aol.com; Date: Fri, 26 Nov 2004 16:20:08 EST; What would be a good (cheap) analog (or digital ) scope to use for the sole purpose of observing my transmitted signal? And being I have zero experience with a scope, what would be the easiest method; /archives//html/Amps/2004-11/msg00441.html (9,963 bytes)
9. Re: [Amps] Help on Aerovox capacitor (score: 1): Author: G3rzp@aol.com; Date: Sat, 18 Dec 2004 08:42:47 EST; The embossed marking is probably an indication of the outer foil. That you maybe able to find out by measuring the capacitance from each terminal to case. You could also measure the leakage current.; /archives//html/Amps/2004-12/msg00231.html (7,365 bytes)
10. Re: [Amps] SB-220 (score: 1): Author: G3rzp@aol.com; Date: Mon, 27 Dec 2004 11:01:51 EST; The only RF-Tx amplifiers that do not benefit from a step-start are those that already have one. To my mind, anything over the 100 watt level can benefit - and quite possibly, stuff under that too, i; /archives//html/Amps/2004-12/msg00359.html (7,872 bytes)
11. Re: [Amps] 8122 x 12 (score: 1): Author: G3rzp@aol.com; Date: Wed, 29 Dec 2004 05:19:08 EST; About 30 years ago, you could buy such an amplifier from Marconi, the H-1000. It used 12 4CX250B's in a distributed wide-band amplifier configuration and provided 1 kW CW or PEP with 100 mW drive bet; /archives//html/Amps/2004-12/msg00379.html (8,229 bytes)
12. Re: [Amps] 8122 x 12 (score: 1): Author: G3rzp@aol.com; Date: Wed, 29 Dec 2004 10:17:18 EST; When I think about it, the H-1000 was probably only rated to 25 MHz.... There were variants. When used as a drive for the H1200 30kW tx, they were 4 - 27MHz: stand alone as the HS113 (which I believe; /archives//html/Amps/2004-12/msg00381.html (8,291 bytes)
13. Re: [Amps] 8122 x 12 (score: 1): Author: G3rzp@aol.com; Date: Thu, 30 Dec 2004 04:51:29 EST; Could you please make some info available? I can photocopy and mail next week - I could try getting the XYL to use her scanner if she has time before she goes off on her next business trip. Personall; /archives//html/Amps/2004-12/msg00394.html (8,717 bytes)
14. Re: [Amps] Parasites, Microbes and Other Hazards (score: 1): Author: G3rzp@aol.com; Date: Sun, 2 Jan 2005 07:52:47 EST; I presume that this is the latest thing in biotechnology.......... How does this 'microbe wire' work, and are the microbes linear? If you have the wrong sort of organic insulating material around, do; /archives//html/Amps/2005-01/msg00008.html (7,007 bytes)
15. Re: [Amps] OT: Relay questions (score: 1): Author: G3rzp@aol.com; Date: Wed, 5 Jan 2005 12:54:46 EST; I use a Ledex driving a ceramic rotary switch, the one about an inch and a quarter across. It has front and back contacts connected together, and 50 ohm strip lines from it to the 12 SO239 sockets. T; /archives//html/Amps/2005-01/msg00056.html (6,864 bytes)
16. Re: [Amps] Q meter [TSPA] (score: 1): Author: G3rzp@aol.com; Date: Sat, 8 Jan 2005 04:11:19 EST; In my opinion, I dont think any instrument can measure the true unloaded Q exactly due to too many factors or variables such as stray capacitance and inductance. Even when measuring the components on; /archives//html/Amps/2005-01/msg00123.html (7,588 bytes)
17. Re: [Amps] Q meter [TSPA] (score: 1): Author: G3rzp@aol.com; Date: Sat, 8 Jan 2005 15:12:25 EST; In a tank circuit, rather than use a Q meter, I prefer to put a suitable resistor from the plate to ground (and with no HV, of course) feed a signal in from the output Then use a valve voltmeter to m; /archives//html/Amps/2005-01/msg00129.html (8,089 bytes)
18. Re: [Amps] Q meter [TSPA] (score: 1): Author: G3rzp@aol.com; Date: Sun, 9 Jan 2005 02:57:34 EST; There's a question as whether the Q function on an LCR meter measures Q - or rather, which Q it measures...... The usual LCR or bridge (which measures 1/D as well) measures at some fi xed, and genera; /archives//html/Amps/2005-01/msg00136.html (9,699 bytes)
19. Re: [Amps] Link coupling (score: 1): Author: G3rzp@aol.com; Date: Sun, 9 Jan 2005 03:04:23 EST; The problem with the fixed link and varying secondary turns is that you need the secondary impedance to vary. There's some compensation in that as the number of secondary turns drops, the leakage rea; /archives//html/Amps/2005-01/msg00137.html (7,736 bytes)
20. Re: [Amps] Link coupling (score: 1): Author: G3rzp@aol.com; Date: Sun, 9 Jan 2005 07:26:26 EST; The trouble with a direct ground on a balanced feedline is increased risk of sudden discharge -- as in "big-bang". To reduce this risk, slowly bleed down the static charge with a 1-10 M-ohm HV-type r; /archives//html/Amps/2005-01/msg00143.html (8,216 bytes)

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