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References: [ +subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*Topband\:\s+The\s+WD8DSB\s+mini\-flag\s+antenna\s*$/: 28 ]

Total 28 documents matching your query.

21. Re: Topband: The WD8DSB mini-flag antenna (score: 1)
Author: "Tim Duffy" <k3lr@k3lr.com>
Date: Wed, 24 Feb 2021 16:55:55 -0500
Hello Don and John: DXE has not measured the noise figure of the loop preamp yet, but we will soon and it will be posted on the part detail for the loop amplifier. https://www.dxengineering.com/parts
/archives//html/Topband/2021-02/msg00124.html (15,748 bytes)

22. Re: Topband: The WD8DSB mini-flag antenna (score: 1)
Author: Jim Brown <jim@audiosystemsgroup.com>
Date: Wed, 24 Feb 2021 14:41:05 -0800
YES! and direct signal ingress into the feedline that often haunts us. I do have one recommendation about pattern distortion as follows. Check to make sure the peak and the null of the antenna are in
/archives//html/Topband/2021-02/msg00125.html (10,611 bytes)

23. Re: Topband: The WD8DSB mini-flag antenna (score: 1)
Author: Don Kirk <wd8dsb@gmail.com>
Date: Wed, 24 Feb 2021 17:44:58 -0500
Hi Tim, Thanks, and I have gain vs frequency plot on my website for the DX Engineering preamp and my measurements agree with yours. The DX Engineering preamp designed for use my my portable flag is d
/archives//html/Topband/2021-02/msg00126.html (17,472 bytes)

24. Re: Topband: The WD8DSB mini-flag antenna (score: 1)
Author: Jim Brown <jim@audiosystemsgroup.com>
Date: Wed, 24 Feb 2021 14:55:45 -0800
The link takes me to a page showing a unit with no display and no tuning knob, needing a computer to run it. I needed to follow a link on that page to find the self-contained unit. http://afedri-sdr.
/archives//html/Topband/2021-02/msg00127.html (24,026 bytes)

25. Re: Topband: The WD8DSB mini-flag antenna (score: 1)
Author: Jim Brown <jim@audiosystemsgroup.com>
Date: Wed, 24 Feb 2021 15:09:47 -0800
Studying the fine print, the stand-alone unit needs either USB power or 7.5-10VDC. I've got a couple of 3 Ah Motorola-branded outboard cell phone battery packs that look like they could work with the
/archives//html/Topband/2021-02/msg00128.html (9,639 bytes)

26. Re: Topband: The WD8DSB mini-flag antenna (score: 1)
Author: "Richard (Rick) Karlquist" <richard@karlquist.com>
Date: Wed, 24 Feb 2021 16:53:43 -0800
" The problem here is that any loop antenna inherently has a noise temperature of 300K, because it is lossy, and because it "sees" the earth" Would you elaborate on that? Small loop 1/10 of wave leng
/archives//html/Topband/2021-02/msg00129.html (14,192 bytes)

27. Re: Topband: The WD8DSB mini-flag antenna (score: 1)
Author: <n4is@comcast.net>
Date: Wed, 24 Feb 2021 23:30:35 -0500
The antenna in question is not a "loop" it is a terminated loop, the diagram is a cardioid, it is very broadband 1-10, like 1 MHz to 10 MHz or 3 o 30 MHz with the same irradiation diagram. The behav
/archives//html/Topband/2021-02/msg00130.html (13,605 bytes)

28. Re: Topband: The WD8DSB mini-flag antenna (score: 1)
Author: "Richard (Rick) Karlquist" <richard@karlquist.com>
Date: Fri, 26 Feb 2021 07:58:33 -0800
Correction to my previous comment. I didn't realize that the mini-flag impedance is close to 50 ohms resistive at all frequencies of interest. Therefore, the 50 NF of any amplifier is also the NF tha
/archives//html/Topband/2021-02/msg00141.html (11,381 bytes)

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