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References: [ +subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*Topband\:\s+best\s+core\s+material\?\s*$/: 15 ]

Total 15 documents matching your query.

1. Topband: best core material? (score: 1)
Author: James Rodenkirch <rodenkirch_llc@msn.com>
Date: Mon, 5 Aug 2013 11:33:42 -0600
I have a schematic for a delta shaped loop that shows I'll need an 18:1 transformer to transform the 950 ohms of the antenna to 50 ohms (feeding it with 50 ohm coax). One transformer diagram shows an
/archives//html/Topband/2013-08/msg00041.html (6,656 bytes)

2. Re: Topband: best core material? (score: 1)
Author: James Rodenkirch <rodenkirch_llc@msn.com>
Date: Mon, 5 Aug 2013 12:03:43 -0600
Sorry - didn't make it crystal clear that this is a Delta shaped variant of a EWE antenna!!!! My bad for not utilizing all of the necessary verbiage to make that clear....you see it in ON4UN's latest
/archives//html/Topband/2013-08/msg00042.html (10,206 bytes)

3. Re: Topband: best core material? (score: 1)
Author: "Shoppa, Tim" <tshoppa@wmata.com>
Date: Mon, 5 Aug 2013 18:12:48 +0000
If receive only, you will do just fine using the 2873000202 binocular 73 material core that Tom mentions. I think this corresponds to Amidon part number BN-202-73. Newark stocks the part under the or
/archives//html/Topband/2013-08/msg00044.html (11,445 bytes)

4. Re: Topband: best core material? (score: 1)
Author: "Charlie Cunningham" <charlie-cunningham@nc.rr.com>
Date: Mon, 5 Aug 2013 14:14:25 -0400
Hi, Jim Yes, I gathered that it was a receiving loop. I built one a few years ago and used 73 mat'l for the transformer because it's what I had. Worked quite well. It was also a delta-shaped "Kaz" an
/archives//html/Topband/2013-08/msg00045.html (11,230 bytes)

5. Re: Topband: best core material? (score: 1)
Author: James Rodenkirch <rodenkirch_llc@msn.com>
Date: Mon, 5 Aug 2013 12:19:57 -0600
I wasn't going to use a binocular core, Tim - I was going to use the Amidon FT-140-43 OR the FT-140-77 IF it made any noticeable difference....is there some magical reason to use binocular vice stand
/archives//html/Topband/2013-08/msg00046.html (12,691 bytes)

6. Re: Topband: best core material? (score: 1)
Author: "Charlie Cunningham" <charlie-cunningham@nc.rr.com>
Date: Mon, 5 Aug 2013 14:24:05 -0400
BTW, Jim I assume that 18:1 is the impedance ratio, and the turns ratio is of the order of 4:1 or so Charlie, K4OTV Sorry - didn't make it crystal clear that this is a Delta shaped variant of a EWE a
/archives//html/Topband/2013-08/msg00048.html (11,018 bytes)

7. Re: Topband: best core material? (score: 1)
Author: "Charlie Cunningham" <charlie-cunningham@nc.rr.com>
Date: Mon, 5 Aug 2013 14:28:32 -0400
When I did mine, I had used up all my binocular cores that were large enough, so I taped two tubular cores together side-by-side to make a binocular core. A little more room to wind, and maybe a litt
/archives//html/Topband/2013-08/msg00050.html (13,525 bytes)

8. Re: Topband: best core material? (score: 1)
Author: James Rodenkirch <rodenkirch_llc@msn.com>
Date: Mon, 5 Aug 2013 12:28:49 -0600
Yes to both, Charlie - a friend of mine has a calculator to figure the exact turns ratio BUT, at a web site I found for this antenna (used during an FO0 dxpedition) the ratio was defined as 8 turns i
/archives//html/Topband/2013-08/msg00051.html (12,305 bytes)

9. Re: Topband: best core material? (score: 1)
Author: "Shoppa, Tim" <tshoppa@wmata.com>
Date: Mon, 5 Aug 2013 18:33:49 +0000
You'll notice in my original response I was trying to determine if this is only for receiving or if you were planning on transmitting with this transformer too few turns of skinny wire through it wou
/archives//html/Topband/2013-08/msg00053.html (14,579 bytes)

10. Re: Topband: best core material? (score: 1)
Author: "Charlie Cunningham" <charlie-cunningham@nc.rr.com>
Date: Mon, 5 Aug 2013 14:45:12 -0400
BTW, Jim I think you will be pleased with that loop! Mine was 40' long X 10' high and it was an excellent receive antenna for 160, 80, 40 and 30 m. If you model it in EZNEC, you will find that the im
/archives//html/Topband/2013-08/msg00054.html (12,960 bytes)

11. Re: Topband: best core material? (score: 1)
Author: James Rodenkirch <rodenkirch_llc@msn.com>
Date: Mon, 5 Aug 2013 13:23:13 -0600
Thanks to all that replied - VERY informative information as well as anecdotal evidence the small delta loop receive antenna works well AND at a lower height, which I was thinking of doing but not su
/archives//html/Topband/2013-08/msg00056.html (10,817 bytes)

12. Re: Topband: best core material? (score: 1)
Author: "Charlie Cunningham" <charlie-cunningham@nc.rr.com>
Date: Mon, 5 Aug 2013 15:31:49 -0400
Hi, Jim Well, seems that I may have borrowed the 40X10 dimensions from somewhere. Interesting thing, is, if you are into modeling things with EZNEC, as I am, you can play with the dimensions quite a
/archives//html/Topband/2013-08/msg00057.html (17,027 bytes)

13. Re: Topband: best core material? (score: 1)
Author: "Charlie Cunningham" <charlie-cunningham@nc.rr.com>
Date: Mon, 5 Aug 2013 15:36:44 -0400
By the way, Jim. My loop was only about 3' high on the bottom 40' run and about 13' at the apex. Charlie, K4OTV Thanks to all that replied - VERY informative information as well as anecdotal evidence
/archives//html/Topband/2013-08/msg00058.html (11,275 bytes)

14. Re: Topband: best core material? (score: 1)
Author: "JC N4IS" <n4is@comcast.net>
Date: Mon, 5 Aug 2013 15:49:37 -0400
If you plan to use the antenna on 160m you'll need 73 material. 43 works 3.8 up. Regards JC N4IS I wasn't going to use a binocular core, Tim - I was going to use the Amidon FT-140-43 OR the FT-140-77
/archives//html/Topband/2013-08/msg00059.html (13,452 bytes)

15. Re: Topband: best core material? (score: 1)
Author: James Rodenkirch <rodenkirch_llc@msn.com>
Date: Mon, 5 Aug 2013 14:09:47 -0600
Yes, JC - ordering 73 material binocular cores today! _________________ Topband Reflector
/archives//html/Topband/2013-08/msg00061.html (14,889 bytes)

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