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References: [ +subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*\[Amps\]\s+Drake\s+L4B\s+to\s+6\s+Meters\s+Help\s*$/: 33 ]

Total 33 documents matching your query.

1. [Amps] Drake L4B to 6 Meters Help (score: 1): Author: "Michelle" <michelle_melt@windstream.net>; Date: Mon, 12 Dec 2016 10:01:33 -0500; Hi Group, I have converted a Drake L4B to 6 meters and I seem to be stuck at 750 watts output, I have tried a PI input (no change) , different tank coils (less output), The current setup listed below; /archives//html/Amps/2016-12/msg00297.html (8,053 bytes)
2. Re: [Amps] Drake L4B to 6 Meters Help (score: 1): Author: Ron Youvan <ka4inm@gmail.com>; Date: Mon, 12 Dec 2016 10:13:00 -0500; I have converted a Drake L4B to 6 meters and I seem to be stuck at 750 watts output, I have tried a PI input (no change) , different tank coils (less output), The current setup listed below I have c; /archives//html/Amps/2016-12/msg00299.html (9,698 bytes)
3. [Amps] Drake L4B to 6 Meters Help (score: 1): Author: "Michelle" <michelle_melt@windstream.net>; Date: Mon, 12 Dec 2016 11:24:19 -0500; You are not missing anything, it sounds as if you have it all done just about right. 750W for 2300V/0.65A Efficiency right around 50%, gain 8dB It's exactly what I would have said to expect from a co; /archives//html/Amps/2016-12/msg00303.html (8,141 bytes)
4. Re: [Amps] Drake L4B to 6 Meters Help (score: 1): Author: "Peter Frenning [OZ1PIF]" <peter@frenning.dk>; Date: Mon, 12 Dec 2016 17:41:51 +0100; _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2016-12/msg00304.html (7,750 bytes)
5. [Amps] Drake L4B to 6 Meters Help (score: 1): Author: "Michelle" <michelle_melt@windstream.net>; Date: Mon, 12 Dec 2016 11:56:02 -0500; You are not missing anything. An L4B converted to 6M will be something around 50% efficient because the components used have not been optimized for that band. If your 750W output is key down you will; /archives//html/Amps/2016-12/msg00306.html (7,718 bytes)
6. [Amps] Drake L4B to 6 Meters Help (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Mon, 12 Dec 2016 09:00:50 -0800; Hi Group, I have converted a Drake L4B to 6 meters and I seem to be stuck at 750 watts output, I have tried a PI input (no change) , different tank coils (less output), The current setup listed below; /archives//html/Amps/2016-12/msg00307.html (11,347 bytes)
7. [Amps] Drake L4B to 6 Meters Help (score: 1): Author: "Michelle" <michelle_melt@windstream.net>; Date: Mon, 12 Dec 2016 12:42:55 -0500; OK-you did not say that you had rebuilt the PA and removed all the old parts. Many conversions do not use the proper filament choke, proper by-passing at the plate choke and filament choke, proper pl; /archives//html/Amps/2016-12/msg00309.html (8,571 bytes)
8. [Amps] Drake L4B to 6 Meters Help (score: 1): Author: "Michelle" <michelle_melt@windstream.net>; Date: Mon, 12 Dec 2016 13:05:34 -0500; Is it biased class "C" for CW usage on 6 meters? If so it should do a bit better that 65% efficiency. A pair of 3-500Z's can produce over a kilowatt if it has the plate power that supports it. (norma; /archives//html/Amps/2016-12/msg00310.html (9,148 bytes)
9. Re: [Amps] Drake L4B to 6 Meters Help (score: 1): Author: Paul Baldock <paul@paulbaldock.com>; Date: Mon, 12 Dec 2016 10:07:29 -0800; I have converted an SB220 and a TL922 for 6M. Both will produce 1300W PEP 6M. ( FYI I have converted an SB200 and that gave 600W PEP) A stock L4-B will easily produce 1KW PEP on 10m and should do the; /archives//html/Amps/2016-12/msg00311.html (9,885 bytes)
10. [Amps] Drake L4B to 6 Meters Help (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Mon, 12 Dec 2016 10:25:11 -0800; You don't say your modulation mode. (CW - FM or SSB whatever that is) I'm no expert, but you are achieving 50% efficiency, that doesn't sound bad to me for 6 meters, to get more power out you need mo; /archives//html/Amps/2016-12/msg00313.html (9,759 bytes)
11. Re: [Amps] Drake L4B to 6 Meters Help (score: 1): Author: Ed Stallman <ed.n5dg@gmail.com>; Date: Mon, 12 Dec 2016 12:32:09 -0600; strap. Strap conducts RF on BOTH sides. Tubing only conducts RF on the outside of the tubing. .5 inch wide strap = .318 inch OD tubing. Again, strap, wound flat, has no stray C between adjacent turn; /archives//html/Amps/2016-12/msg00314.html (9,734 bytes)
12. [Amps] Drake L4B to 6 Meters Help (score: 1): Author: "Michelle" <michelle_melt@windstream.net>; Date: Mon, 12 Dec 2016 13:36:01 -0500; I have converted an SB220 and a TL922 for 6M. Both will produce 1300W PEP 6M. ( FYI I have converted an SB200 and that gave 600W PEP) A stock L4-B will easily produce 1KW PEP on 10m and should do the; /archives//html/Amps/2016-12/msg00315.html (10,320 bytes)
13. [Amps] Drake L4B to 6 Meters Help (score: 1): Author: "Michelle" <michelle_melt@windstream.net>; Date: Mon, 12 Dec 2016 13:47:54 -0500; Guess I missed that List! Old age....I don't read as clearly as I once did! You noted in another post that you had biased the tubes for zero idling current?? If so, FYI my AL-82 runs about 150 ma on; /archives//html/Amps/2016-12/msg00316.html (9,326 bytes)
14. [Amps] Drake L4B to 6 Meters Help (score: 1): Author: "Michelle" <michelle_melt@windstream.net>; Date: Mon, 12 Dec 2016 13:58:37 -0500; Jim, current is way too high. 220-230 ma. You can knock the idle current down to 100 ma, when on high B+ position, with just 8 x diodes in the CT. Which will also result in 40 ma when on low B+ posit; /archives//html/Amps/2016-12/msg00318.html (9,580 bytes)
15. [Amps] Drake L4B to 6 Meters Help (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Mon, 12 Dec 2016 12:00:33 -0800; strap. Strap conducts RF on BOTH sides. Tubing only conducts RF on the outside of the tubing. .5 inch wide strap = .318 inch OD tubing. Again, strap, wound flat, has no stray C between adjacent turns; /archives//html/Amps/2016-12/msg00320.html (10,607 bytes)
16. [Amps] Drake L4B to 6 Meters Help (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Mon, 12 Dec 2016 12:27:03 -0800; Is it biased class "C" for CW usage on 6 meters? If so it should do a bit better that 65% efficiency. A pair of 3-500Z's can produce over a kilowatt if it has the plate power that supports it. (norma; /archives//html/Amps/2016-12/msg00322.html (9,846 bytes)
17. Re: [Amps] Drake L4B to 6 Meters Help (score: 1): Author: mike via Amps <amps@contesting.com>; Date: Mon, 12 Dec 2016 16:50:55 -0500; I saw this on Eham.com for sale.SB 220 converted to 6 meters only as per QST April 08 minus vacuum variable 900 watt output. with paperwork, very nice. taking offers, pickup only zip I have converted; /archives//html/Amps/2016-12/msg00324.html (11,048 bytes)
18. Re: [Amps] Drake L4B to 6 Meters Help (score: 1): Author: Alek Petkovic <vk6apk@bigpond.com>; Date: Tue, 13 Dec 2016 06:05:40 +0800; It could be something to do with your tuning procedure. On 6m with a SB-220 for example, the tuning procedure is a many step process of starting with the load cap, then tune cap, then load, then tune; /archives//html/Amps/2016-12/msg00327.html (12,309 bytes)
19. [Amps] Drake L4B to 6 Meters Help (score: 1): Author: "Michelle" <michelle_melt@windstream.net>; Date: Mon, 12 Dec 2016 17:06:08 -0500; Jim, Is it biased class "C" for CW usage on 6 meters? If so it should do a bit better that 65% efficiency. No, Amp is for SSB use only, No CW<< What condition are the 3-500Z's? Tubes are new from RF; /archives//html/Amps/2016-12/msg00328.html (9,417 bytes)
20. [Amps] Drake L4B to 6 Meters Help (score: 1): Author: "Michelle" <michelle_melt@windstream.net>; Date: Mon, 12 Dec 2016 17:16:04 -0500; Mike, I saw this on Eham.com for sale.SB 220 converted to 6 meters only as per QST April 08 minus vacuum variable 900 watt output. with paperwork, very nice. taking offers, pickup only zip Michelle _; /archives//html/Amps/2016-12/msg00329.html (9,564 bytes)

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