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1. [Amps] KVAR Caps Rating (score: 1)
Author: Karl-Arne Markstr&ouml;m <sm0aom@telia.com> (Karl-Arne Markstr&ouml;m)
Date: Sat, 4 Jan 2003 12:19:46 +0100
Hello, The kVAr (kilovoltamperes reactive) is expressed as rms voltage over the capacitor x rms current through the capacitor. Assuming very low losses in the capacitor, the phase angle of the result
/archives//html/Amps/2003-01/msg00035.html (10,257 bytes)

2. [Amps] KVAR Caps Rating (score: 1)
Author: Karl-Arne Markstr&ouml;m <sm0aom@telia.com> (Karl-Arne Markstr&ouml;m)
Date: Mon, 6 Jan 2003 00:15:09 +0100
Hello, It is most certainly true that this is a complex matter. Maybe the most appropriate action now is to find out what capacitance the capacitors referenced to in the original post have. If they a
/archives//html/Amps/2003-01/msg00047.html (9,457 bytes)

3. [Amps] Eimac vs Svetlana (score: 1)
Author: Karl-Arne Markstr&ouml;m <sm0aom@telia.com> (Karl-Arne Markstr&ouml;m)
Date: Fri, 6 Dec 2002 07:23:52 +0100
I can second this. My organization (Stockholm Radio) runs several Collins 208U-10 10 kW amplifiers for air/ground SSB services that used Eimac 4CX350A's in the driver chain. During the final time bef
/archives//html/Amps/2002-12/msg00097.html (10,165 bytes)

4. [Amps] Re: KW Linear for FT-817 (score: 1)
Author: Karl-Arne Markstr&ouml;m <sm0aom@telia.com> (Karl-Arne Markstr&ouml;m)
Date: Wed, 17 Jul 2002 22:22:21 +0200
Gentlemen, This could probably also be done using 4 x 4CX250 or similar tubes in parallel. The Swedish ITT Marine subsidiary, Standard Radio & Telefon AB, manufactured for decades the ST1200/ST1400/S
/archives//html/Amps/2002-07/msg00264.html (8,646 bytes)

5. Re: [Amps] Benefits of 3-phase power? (score: 1)
Author: Karl-Arne Markstr&ouml;m <sm0aom@telia.com>
Date: Sun, 16 Nov 2003 15:07:18 +0100
Gentlemen, I can second your observation that 3-phase power feed is superior to single-phase. When power levels much more than 1 kVA input are used, it is possible to observe poor AC regulation with
/archives//html/Amps/2003-11/msg00215.html (10,128 bytes)

6. Re: [Amps] Benefits of 3-phase power? (score: 1)
Author: Karl-Arne Markstr&ouml;m <sm0aom@telia.com>
Date: Wed, 19 Nov 2003 08:27:21 +0100
In Sweden at least 3-phase feed is used for all "drops" to domestic houses built on this side of WW I. Inside the house, after the energy meter, the single-phase outlets are distributed over the phas
/archives//html/Amps/2003-11/msg00269.html (12,312 bytes)

7. Re: [Amps] Fw: airspaced C's (score: 1)
Author: Karl-Arne Markstr&ouml;m <sm0aom@telia.com>
Date: Tue, 23 Dec 2003 18:50:20 +0100
Hello, A conservative estimate is 1200 V peak per mm plate spacing. It is however dependent on the finish of the capacitor plates, and if the edges are properly rounded. 73 and Season's Greetings/ Ka
/archives//html/Amps/2003-12/msg00353.html (7,472 bytes)

8. Re: [Amps] disk caps needed (score: 1)
Author: Karl-Arne Markstr&ouml;m <sm0aom@telia.com>
Date: Thu, 25 Dec 2003 13:17:59 +0100
Hello, the capacitor in the DX-100 you are looking for appears to be the 0.02 uF that is connected over the secondary of the modulation transformer. This capacitor is there to provide an amount of hi
/archives//html/Amps/2003-12/msg00376.html (8,292 bytes)

9. Re: [Amps] HP vector Voltmeter info (score: 1)
Author: Karl-Arne Markstr&ouml;m <sm0aom@telia.com>
Date: Tue, 13 Jan 2004 21:54:26 +0100
Hello, If my memory serves me right, the isolator tip is used to compensate for the effects of the signal source internal impedances on sampling voltmeter readings. Without it, low source impedances
/archives//html/Amps/2004-01/msg00136.html (8,076 bytes)

10. Re: [Amps] data sheet? (score: 1)
Author: Karl-Arne Markstr&ouml;m <sm0aom@telia.com>
Date: Thu, 24 Jun 2004 18:11:59 +0200
Take a look at: http://www.svetlana.com/graphics/products/pdf/8560AS.pdf Electrically it is very similar to the 4CX250B Hope this helps and 73/ Karl-Arne SM0AOM -- Original Message -- From: "DEHAYS D
/archives//html/Amps/2004-06/msg00122.html (7,558 bytes)

11. Re: [Amps] load capacitor ratings? (score: 1)
Author: Karl-Arne Markstr&ouml;m <sm0aom@telia.com>
Date: Tue, 31 Aug 2004 08:03:51 +0200
Actually, no. A peak reading wattmeter will show PEP, which by definition is the power delivered to the load during one or more RF cycles at the peak of the modulation envelope. If the peak voltage f
/archives//html/Amps/2004-08/msg00471.html (11,634 bytes)

12. Re: [Amps] help with Collins amp ID (score: 1)
Author: Karl-Arne Markstr&ouml;m <sm0aom@telia.com>
Date: Tue, 28 Sep 2004 08:12:17 +0200
The descriptions fits in on the Collins 204H-1 servo-tuned amplifier. It is the servo-tuned "brother" of the two-channel 204F-1 which appears to be more common. Pictures of both amplifiers can seen i
/archives//html/Amps/2004-09/msg00469.html (8,613 bytes)

13. Re: [Amps] Plate modulator xmfr ? (score: 1)
Author: Karl-Arne Markstr&ouml;m <sm0aom@telia.com>
Date: Sun, 10 Oct 2004 16:00:04 +0200
Hello Stephen, The use of 813's for both the class AB modulator and class C RF amplifier is a quite wise move, as it simplifies the power supply considerations a lot. A worked example, assuming the u
/archives//html/Amps/2004-10/msg00130.html (12,039 bytes)

14. Re: [Amps] 4CX350 in Dentron Clipperton V ????? (score: 1)
Author: Karl-Arne Markstr&ouml;m <sm0aom@telia.com>
Date: Sun, 10 Oct 2004 17:25:55 +0200
The socket for the 4CX350A is identical to the 4CX250B socket, but there are a few differences: - the input capacitance is 24.2 pF instead of 15.7 pF - the output capacitance is 5.5 pF instead of 4.5
/archives//html/Amps/2004-10/msg00133.html (9,216 bytes)

15. Re: [Amps] Looking for a design for a single 4cx250b tube on 50Mhz-Six Meters (score: 1)
Author: Karl-Arne Markstr&ouml;m <sm0aom@telia.com>
Date: Mon, 11 Oct 2004 21:21:58 +0200
How about this one? http://www.btinternet.com/~geoffrey.brown3/4cx.html 73/ Karl-Arne SM0AOM _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contest
/archives//html/Amps/2004-10/msg00158.html (8,950 bytes)

16. Re: [Amps] Looking for a design for a single 4cx250b tube on50Mhz-SixMeters (score: 1)
Author: Karl-Arne Markstr&ouml;m <sm0aom@telia.com>
Date: Tue, 12 Oct 2004 18:29:22 +0200
I agree, the tuned circuits in this amplifier do look not very optimised... However, the solution may be closer than we think, look up the G6JP single 4CX250B 144 MHz PA in the RSGB VHF Manual, redes
/archives//html/Amps/2004-10/msg00178.html (11,961 bytes)

17. Re: [Amps] AIR-DUX coil info wanted (score: 1)
Author: Karl-Arne Markstr&ouml;m <sm0aom@telia.com>
Date: Mon, 25 Oct 2004 08:59:50 +0200
According to information in an old ARRL Handbook an Air-Dux 195-2 coil assembly consists of these parts connected in series: L1, strap coil for 10 m, 4 turns of 5/16" width strap, 1 1/2" diameter, 2
/archives//html/Amps/2004-10/msg00396.html (8,285 bytes)

18. Re: [Amps] 4CX1500B QSK (score: 1)
Author: Karl-Arne Markstr&ouml;m <sm0aom@telia.com>
Date: Mon, 1 Nov 2004 18:48:06 +0100
Hello Mark, The solution that I would recommend is a grid-block keying circuit that biases the grid into the cut-off region when the key is up. This is easy to handle if you drive the grid bias circu
/archives//html/Amps/2004-11/msg00003.html (10,071 bytes)

19. Re: [Amps] Shaded-pole Tube Blower (score: 1)
Author: Karl-Arne Markstr&ouml;m <sm0aom@telia.com>
Date: Mon, 22 Nov 2004 18:44:40 +0100
I have the same experience with 4CX250B's. Sometimes the phase-sequence sensor for the 3-phase blowers in the Standard Radio CT1000's 1 kW autotune PA's failed to sense backwards rotation and the con
/archives//html/Amps/2004-11/msg00377.html (9,646 bytes)

20. Re: [BULK] - [Amps] Advice on instruments for ham use (score: 1)
Author: Karl-Arne Markstr&ouml;m <sm0aom@telia.com>
Date: Tue, 23 Nov 2004 19:46:54 +0100
Pete, If you are willing to include a certain amount of "gambling" in the 'scope purchase, something to look for is the Tek 465 100 MHz unit. These are quite common, reasonably priced, and a well-kep
/archives//html/Amps/2004-11/msg00393.html (10,112 bytes)


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