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Total 11 documents matching your query.

1. [Amps] Tank Coil spacing (score: 1)
Author: "Steve Flood" <flood@ixi.net>
Date: Sun, 25 Mar 2007 17:45:32 -0600
As I begin to experiment with component layout on an amp ("playing chassis-chess"), the biggest hurdle is trying to maintain the requisite space around the pi and L coils. I wound them 3" diameter 10
/archives//html/Amps/2007-03/msg00335.html (6,986 bytes)

2. Re: [Amps] Tank Coil spacing (score: 1)
Author: "Robert Bonner" <rbonner@qro.com>
Date: Sun, 25 Mar 2007 20:41:06 -0500
Steve, I like to adhere to an absolute minimum of 1". I've been in arguments with others that voltage and RF will not arc down to 1/10" etc... However as you get COILS closer to the cabinet wall stra
/archives//html/Amps/2007-03/msg00336.html (9,322 bytes)

3. Re: [Amps] Tank Coil spacing (score: 1)
Author: Steve Thompson <g8gsq@eltac.co.uk>
Date: Mon, 26 Mar 2007 09:02:17 +0100
Something I found with external anode valves (4CX250 - 8877 sizes) is that the actual capacitance from anode to ground when they're mounted in a chassis, not close up against side panels, is roughly
/archives//html/Amps/2007-03/msg00339.html (6,915 bytes)

4. Re: [Amps] Tank Coil spacing (score: 1)
Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Date: Mon, 26 Mar 2007 14:38:52 +0200 (CEST)
Steve asked: To meet the current requirements of the FCC and the Radio Regulations on spurious emissions, yes. The Class AB stage produces a harmonic content in the plate current that is 6 dB down on
/archives//html/Amps/2007-03/msg00341.html (7,815 bytes)

5. Re: [Amps] Tank Coil spacing (score: 1)
Author: "Tom W8JI" <w8ji@w8ji.com>
Date: Mon, 26 Mar 2007 11:36:15 -0400
Peter, Let's not leap to conclusions! The answer is actually no. Most amplifiers will meet the regulations easily without a pi-L, and many pi-L's actually are insignificantly better on harmonics or
/archives//html/Amps/2007-03/msg00344.html (9,539 bytes)

6. Re: [Amps] Tank Coil spacing (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Mon, 26 Mar 2007 17:32:23 +0100
There are some interesting measurements on G4AXX's website, at: http://granta.g4axx.com/Linear_design_notes.php3 For that particular amplifier, the harmonic levels on various bands ranged from -45dBc
/archives//html/Amps/2007-03/msg00346.html (8,272 bytes)

7. Re: [Amps] Tank Coil spacing (score: 1)
Author: Colin Lamb <k7fm@teleport.com>
Date: Mon, 26 Mar 2007 09:18:25 -0800 (GMT-08:00)
Hi Ian: Boy, you and Tom like to complicate things. It should be easy to just read a bit, come close to an existing design, blindly substituting parts on hand, and have a "perfect" amplifier. But, no
/archives//html/Amps/2007-03/msg00347.html (7,989 bytes)

8. Re: [Amps] Tank Coil spacing (score: 1)
Author: "Tom W8JI" <w8ji@w8ji.com>
Date: Mon, 26 Mar 2007 18:21:48 -0400
In the USA the bottom line regulation is we are not allowed to have any emission, no matter what level, that causes a problem. This is why Novices commonly received warnings or citations for out of
/archives//html/Amps/2007-03/msg00349.html (9,263 bytes)

9. Re: [Amps] Tank Coil spacing (score: 1)
Author: "Tom W8JI" <w8ji@w8ji.com>
Date: Mon, 26 Mar 2007 18:30:06 -0400
That's what I always used. Even though 60dB down, I occasionally got harmonic reports on 40 meters when I used an EDZ at 150 feet on 80 meters. I simply added a 1/4 w shorted stub that switches in l
/archives//html/Amps/2007-03/msg00350.html (8,843 bytes)

10. Re: [Amps] Tank Coil spacing (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Mon, 26 Mar 2007 23:56:35 +0100
We have a different regulation in the UK, based on the concept of "undue interference". Peter is the professional expert on exactly what the magic word "undue" is supposed to mean... but in practice
/archives//html/Amps/2007-03/msg00352.html (8,839 bytes)

11. Re: [Amps] Tank Coil spacing (score: 1)
Author: "Keith Dutson" <kdutson@sbcglobal.net>
Date: Mon, 26 Mar 2007 19:40:53 -0500
is always going to be if we get bad reports. If we do, then we fix the problem. Any level of spurious or harmonic emissions that causes a problem is technically illegal. 73 Tom That's how I have alw
/archives//html/Amps/2007-03/msg00355.html (8,703 bytes)

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