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381. Re: [Amps] how to wind an HF broadband 10:1 transformer (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Thu, 28 Feb 2008 18:44:20 -0500
Terms such a "should", "could", "most cost effective", do not give me a very warm feeling Manfred. However if you can show 1.8 - 30 MHz performance statistics at the 1500W level they would go a long
/archives//html/Amps/2008-02/msg00210.html (12,229 bytes)

382. Re: [Amps] how to wind an HF broadband 10:1 transformer (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Thu, 28 Feb 2008 19:25:53 -0500
I have a 1986 catalog which contains that information. Carl KM1H _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amp
/archives//html/Amps/2008-02/msg00212.html (10,009 bytes)

383. Re: [Amps] Class-E Amplifiers (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Fri, 29 Feb 2008 15:28:35 -0500
Arent Class E monoband amps and pretty much with a 7 MHz upper limit? At least that was what I was told by an active E builder who had a 400W 75M AM amp inside about a 17 x 12 x 3 chassis minus the P
/archives//html/Amps/2008-02/msg00223.html (8,238 bytes)

384. Re: [Amps] Class-E Amplifiers (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Fri, 29 Feb 2008 17:09:33 -0500
I should have been more specific. When using power Mosfets of the IRF and similar cheapies numbers which is what many hams appear to be using on MF and low HF. Carl KM1H _____________________________
/archives//html/Amps/2008-02/msg00226.html (10,252 bytes)

385. Re: [Amps] Class-E Amplifiers (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Sat, 1 Mar 2008 21:54:37 -0500
Pretty neat. I still prefer my converted SB-200 for portable use; 750W out and 35 pounds includes the power supply. And I dont have to worry about hurting it with 100W or poor VSWR. I guess Im not qu
/archives//html/Amps/2008-03/msg00000.html (17,212 bytes)

386. Re: [Amps] Class-E Amplifiers (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Sat, 1 Mar 2008 14:18:53 -0500
What home page??? Carl _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2008-03/msg00004.html (14,620 bytes)

387. Re: [Amps] Class-E Amplifiers (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Sat, 1 Mar 2008 08:56:19 -0500
That is impressive Peter. Do you have any details, spectrum plots, etc? Carl KM1H _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mai
/archives//html/Amps/2008-03/msg00013.html (12,339 bytes)

388. Re: [Amps] Class-E Amplifiers (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Sun, 2 Mar 2008 22:05:26 -0500
Why is the forum repeating 1-2 day old messages? Carl _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2008-03/msg00023.html (13,953 bytes)

389. Re: [Amps] SB220 power supply (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Sun, 2 Mar 2008 22:17:05 -0500
Typical HV is 2500 @ 800 ma key down for 1100-1200W out on a stiff 240VAC line. They may not care for 48 hours of CW contesting in the SSB position but they hold up very well otherwise. I see no reas
/archives//html/Amps/2008-03/msg00025.html (9,155 bytes)

390. Re: [Amps] Hunter 2000C recap suggestions (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Wed, 5 Mar 2008 14:35:01 -0500
If you use 8 of them the total C is only ~ 16MF @ 3600V. Id suggest buying 8 220 MF 450V CDE 381LX series Cornell Dublier caps from Mouser. Or the 330 MF if you have the room. The originals only have
/archives//html/Amps/2008-03/msg00041.html (7,746 bytes)

391. Re: [Amps] ferrite in RF chokes for PAs (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Thu, 6 Mar 2008 13:12:29 -0500
This was covered at length on the forum in the past and is also on W8JI's web site. While a ferrite loaded choke will perform well in a low power transmitter such as the single 6146 which the origina
/archives//html/Amps/2008-03/msg00051.html (11,841 bytes)

392. Re: [Amps] Oil-caps delating 2/3 ratings? (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Thu, 6 Mar 2008 14:31:51 -0500
PLEASE, dont compare capacitors designed for HV PS use such as in amps, BC and similar with high ESR caps designed for various energy discharge applications. A true oil filled will pretty much last "
/archives//html/Amps/2008-03/msg00059.html (10,337 bytes)

393. Re: [Amps] Transceiver Output Impedance (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Sun, 9 Mar 2008 11:18:28 -0400
I remember reading a letter from Kenwood about 20 years ago that stated that their SS PA stages were designed to operate into 25-75 Ohm loads since 50 Ohm cable was not a world wide standard. Ive bee
/archives//html/Amps/2008-03/msg00092.html (10,382 bytes)

394. [Amps] FL2100-B input network (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Fri, 14 Mar 2008 10:31:27 -0400
A 500 V silver mica is sufficient in the input networks in place of C-211 thru C-219. That is what Heath, Ameritron, Dentron, Amp Supply and others use. For 160M parallel two caps to share the currre
/archives//html/Amps/2008-03/msg00119.html (11,464 bytes)

395. Re: [Amps] Questions about Amps/Tubes/Design (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Sat, 15 Mar 2008 13:38:38 -0400
AL-82 Not a high volume seller since it was initially priced very close to the AL-1200. Also has a reputation of doing nasties due to the above average voltage used. Ive reoaired several that have si
/archives//html/Amps/2008-03/msg00133.html (10,333 bytes)

396. Re: [Amps] Questions about Amps/Tubes/Design (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Sat, 15 Mar 2008 20:14:21 -0400
Here is what I sent to another ZL Gary. Replace the horrible nylon washers between the ceramic spacers and wafer with a RF grade plastic or Teflon. Build up the junction between the wafer and the spa
/archives//html/Amps/2008-03/msg00135.html (11,517 bytes)

397. Re: [Amps] SB-200 constantly keyed after flash (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Sun, 16 Mar 2008 19:46:35 -0400
Well, you have at least one blown tube, the flash being from inside it. Remove the tube with the auroral glow and check things again. But first with both tubes removed check that you have -125VDC at
/archives//html/Amps/2008-03/msg00141.html (10,375 bytes)

398. Re: [Amps] Ameritron al80a (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Mon, 17 Mar 2008 08:24:40 -0400
Unwind about 4 turns and youve moved the resonance. Carl KM1H _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2008-03/msg00147.html (8,502 bytes)

399. Re: [Amps] AL-1200 Problem (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Mon, 17 Mar 2008 08:27:57 -0400
Replace the "safety" diode on the PS board that goes from B- to ground. It is a 1N5408. Whats with 10M lately? Youre the 4 th guy this weekend to have amp troubles from tuning up on 10M. Carl KM1H __
/archives//html/Amps/2008-03/msg00148.html (8,198 bytes)

400. Re: [Amps] [!! SPAM] Re: SB-200 constantly keyed after flash (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Tue, 18 Mar 2008 09:26:31 -0400
Tony is correct about those coil slugs, Ive had some in here that were almost dust. Since they were to be stripped for 6M conversions Ive not stopped to figure out why the SB-200 appears to cook coil
/archives//html/Amps/2008-03/msg00162.html (14,637 bytes)

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