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References: [ +subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*LF\:\s+Loop\s+\(was\s+Re\:\s+IGBT\s+in\s+136\s+KHz\s+TX\?\)\s*$/: 10 ]

Total 10 documents matching your query.

1. Re: LF: Loop (was Re: IGBT in 136 KHz TX?) (score: 1)
Author:
Date: 22 Jul 2009 00:00 GMT
Dear John, LF, I would like especially to comment on using a one winding loop combined with a step-up transformer: I am using such a loop for years with continuing success. The primary of the transfo
/rsgb_lf_group-archives/html/rsgb_lf_group/2009-07/msg00014.html (11,031 bytes)

2. Re: LF: Loop (was Re: IGBT in 136 KHz TX?) (score: 1)
Author: John Andrews <>
Date: Tue, 21 Jul 2009 20:41:40 -0400
Ha-Jo, That's one way to look at it, and a valid approach. But consider another example: Suppose you have a single-turn loop that has an (arbitrary) impedance of 0.1 +j10 ohms at a frequency of inter
/rsgb_lf_group-archives/html/rsgb_lf_group/2009-07/msg00031.html (11,577 bytes)

3. Re: LF: Loop (was Re: IGBT in 136 KHz TX?) (score: 1)
Author: Alberto di Bene <>
Date: Wed, 22 Jul 2009 19:04:03 +0200
I would like especially to comment on using a one winding loop combined with a step-up transformer: I am interested in knowing opinions about using the loop itself as a primary of the transformer, as
/rsgb_lf_group-archives/html/rsgb_lf_group/2009-07/msg00034.html (10,444 bytes)

4. LF: Loop (was Re: IGBT in 136 KHz TX?) (score: 1)
Author: Warren Ziegler <>
Date: Tue, 21 Jul 2009 09:20:43 -0400
Laurence, What do you think is the upper power limit for a loop using coaxial cable as a conductor? I've run about 1.3 kW into my loop made up of one turn RG-11 and one turn RG-214 (both turns parall
/rsgb_lf_group-archives/html/rsgb_lf_group/2009-07/msg00035.html (12,702 bytes)

5. Re: LF: Loop (was Re: IGBT in 136 KHz TX?) (score: 1)
Author:
Date: 22 Jul 2009 13:51 GMT
Dear John, I am sorry, but I do not see your problems. I do NOT tune my loop. The loop is feeding a transformer, its secondary is connected to a cable into the shack to the receiver or the preselecto
/rsgb_lf_group-archives/html/rsgb_lf_group/2009-07/msg00054.html (12,486 bytes)

6. Re: LF: Loop (was Re: IGBT in 136 KHz TX?) (score: 1)
Author: "Roelof Bakker" <>
Date: Wed, 22 Jul 2009 10:02:22 +0200 (CEST)
Hello John, Regarding the single turn versus multiple turn loop, I have done both. For the multiple turn loop, 100 meter of 1.2 mm PCV clad electrical mains wire was wound on a wooden frame with side
/rsgb_lf_group-archives/html/rsgb_lf_group/2009-07/msg00068.html (10,711 bytes)

7. Re: LF: Loop (was Re: IGBT in 136 KHz TX?) (score: 1)
Author: "mal hamilton" <>
Date: Tue, 21 Jul 2009 16:48:44 +0100
Use a vertical and avoid all the specified LOOP problems and directional limitations. Loops maybe for RX but for TX vertical systems, ie inv L, T top is probably the best approach on LF and MF. One w
/rsgb_lf_group-archives/html/rsgb_lf_group/2009-07/msg00084.html (12,650 bytes)

8. Re: LF: Loop (was Re: IGBT in 136 KHz TX?) (score: 1)
Author: "James Moritz" <>
Date: Wed, 22 Jul 2009 22:33:27 +0100
Dear LF Group, Since I have used several designs of loop antennas almost exclusively for 136k and 500k reception, here are some thoughts:- For small VLF - MF RX loops, the available signal power from
/rsgb_lf_group-archives/html/rsgb_lf_group/2009-07/msg00175.html (18,335 bytes)

9. Re: LF: Loop (was Re: IGBT in 136 KHz TX?) (score: 1)
Author: <>
Date: Tue, 21 Jul 2009 11:10:04 -0400
Just to add a little more information on LF transmitting loops: Paralleling conductors is usually more effective than creating a multi-turn loop. The extra copper loss from another turn can easily ne
/rsgb_lf_group-archives/html/rsgb_lf_group/2009-07/msg00177.html (11,110 bytes)

10. Re: LF: Loop (was Re: IGBT in 136 KHz TX?) (score: 1)
Author: John Andrews <>
Date: Wed, 22 Jul 2009 18:21:29 -0400
Ha-Jo, I wasn't making a comment on your setup -- just pointing out some options for others who might want a tuned, single turn loop. No offense intended! John, W1TAG I am sorry, but I do not see you
/rsgb_lf_group-archives/html/rsgb_lf_group/2009-07/msg00184.html (10,142 bytes)


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