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References: [ +subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*Topband\:\s+RX\s+4\s+square\s*$/: 20 ]

Total 20 documents matching your query.

1. Topband: RX 4 square (score: 1)
Author: Lennart Michaelsson <lennart.michaelsson@telia.com>
Date: Tue, 21 Aug 2007 07:50:44 +0200
Good morning all, Is anyone willing to share their experience with me concerning DX Engineering RX 4 square? I read an article where one ham states that thin and small radiators can cause phase and a
/archives//html/Topband/2007-08/msg00064.html (7,380 bytes)

2. Re: Topband: RX 4 square (score: 1)
Author: Doug Renwick <ve5ra@sasktel.net>
Date: Tue, 21 Aug 2007 08:08:00 -0600
Good morning all, Is anyone willing to share their experience with me concerning DX Engineering RX 4 square? I read an article where one ham states that thin and small radiators can cause phase and a
/archives//html/Topband/2007-08/msg00065.html (8,156 bytes)

3. Re: Topband: RX 4 square (score: 1)
Author: tsmithers@cix.co.uk (Trevor Smithers)
Date: Tue, 21 Aug 2007 15:03 +0100 (BST)
I'm sure this is a subject many on this list will be interested in so posting replies here would be more appropriate. 73 to all Trevor G0KTN _______________________________________________ Topband m
/archives//html/Topband/2007-08/msg00066.html (7,574 bytes)

4. Re: Topband: RX 4 square (score: 1)
Author: "Tom McAlee" <tom@klient.com>
Date: Tue, 21 Aug 2007 16:30:10 -0400
Engineering RX 4 square? ... Please send any comments directly to me. As someone else pointed out, this may be of interest to others so I'll send it to the group. Your mileage may vary, but here is
/archives//html/Topband/2007-08/msg00074.html (11,013 bytes)

5. Topband: RX 4 square (score: 1)
Author: Niko Cimbur <ac6dd@yahoo.com>
Date: Tue, 21 Aug 2007 19:51:20 -0700 (PDT)
It looks like Summer is coming to an end, and topbanders are coming out of the woodwork. I set up the dxerx4sq group so everyone can see the responses to queries about this antenna, instead of the "T
/archives//html/Topband/2007-08/msg00078.html (7,003 bytes)

6. Topband: RX 4 square (score: 1)
Author: "Lee K7TJR" <k7tjr@msn.com>
Date: Tue, 21 Aug 2007 20:53:43 -0700
Good Evening Len and all. I recognize the statements you refer to as being from my recent 8 element antenna article posted to my website. First let me say that I cannot speak to the Dx Engineering RX
/archives//html/Topband/2007-08/msg00079.html (7,777 bytes)

7. Re: Topband: RX 4 square (score: 1)
Author: "Richard (Rick) Karlquist" <richard@karlquist.com>
Date: Tue, 21 Aug 2007 21:56:05 -0700
As I have previously posted, you can do much better the the DXE active whip with a cheap homebrew system. Instead of the DXE amplifier, just use a Mini-circuits transformer, such as T36-1 for $6.55.
/archives//html/Topband/2007-08/msg00080.html (8,020 bytes)

8. Topband: RX 4 square (score: 1)
Author: Lennart Michaelsson <lennart.michaelsson@telia.com>
Date: Wed, 22 Aug 2007 13:45:30 +0200
Good morning Lee and all, Having got more than 40 replies to my simple questions means that top band interest is catching up after northern hemisphere summer season, thank you all! To summarize: Almo
/archives//html/Topband/2007-08/msg00082.html (10,796 bytes)

9. Re: Topband: RX 4 square (score: 1)
Author: "Tom Rauch" <w8ji@contesting.com>
Date: Wed, 22 Aug 2007 10:04:13 -0400
Regarding some comments on the active elements, there are a few corrections that need to be made. If this doesn't pass through on Towertalk I hope someone forwards it. First, someone posted that a si
/archives//html/Topband/2007-08/msg00084.html (11,284 bytes)

10. Topband: RX 4 square (score: 1)
Author: "Lee K7TJR" <k7tjr@msn.com>
Date: Wed, 22 Aug 2007 09:17:32 -0700
At W7LR we are working on a 5 element rectangular array that "fires" in 6 different directions and not a 4 square. This antenna hopefully will provide Bob a maximum RDF for the environmental conditio
/archives//html/Topband/2007-08/msg00088.html (7,295 bytes)

11. Re: Topband: RX 4 square (score: 1)
Author: "Tom Rauch" <w8ji@contesting.com>
Date: Wed, 22 Aug 2007 14:09:43 -0400
I have, several times and the results were not good. It would also be interesting to see how others who have built arrays weigh in on this. I know ZL3IX and others use active elements. At quiet loca
/archives//html/Topband/2007-08/msg00090.html (8,730 bytes)

12. Re: Topband: RX 4 square (score: 1)
Author: W0UN -- John Brosnahan <shr@swtexas.net>
Date: Wed, 22 Aug 2007 19:11:24 -0500
My experimental results confirm what Rick has observed (with all due respect to Tom and Jim). I built an RX array in 1989 using three sets of crossed dipoles. Each dipole was about 10 feet above the
/archives//html/Topband/2007-08/msg00093.html (9,916 bytes)

13. Re: Topband: RX 4 square (score: 1)
Author: "Tom Rauch" <w8ji@contesting.com>
Date: Wed, 22 Aug 2007 21:10:29 -0400
One big factor people miss is the bandwidth of the receiver. Noise power is proportional to receiver bandwidth and a wide receiver or detector system limits on propagated noise much more easily than
/archives//html/Topband/2007-08/msg00094.html (10,216 bytes)

14. Re: Topband: RX 4 square (score: 1)
Author: W0UN -- John Brosnahan <shr@swtexas.net>
Date: Wed, 22 Aug 2007 21:27:34 -0500
Tom-- Well, not missed by me. BW of the receiver is matched to the BW of the desired signal, whether it is a DX station or in my case a radar pulse echo. In fact the received wide-band pulse is sprea
/archives//html/Topband/2007-08/msg00095.html (13,518 bytes)

15. Re: Topband: RX 4 square (score: 1)
Author: "Michael Tope" <W4EF@dellroy.com>
Date: Wed, 22 Aug 2007 22:37:01 -0700
If the sky noise power (read propagated noise + local QRN) is 10dB above the receive system thermal noise at 2.1 KHz bandwidth, it will still be 10dB above the receive system thermal noise when you r
/archives//html/Topband/2007-08/msg00097.html (9,886 bytes)

16. Re: Topband: RX 4 square (score: 1)
Author: "Joe Subich, W4TV" <w4tv@subich.com>
Date: Thu, 23 Aug 2007 08:51:59 -0400
Mike, This is only true if the bandwidth is determined in the detector as happens with a DSP demodulation. Since most amateur transceivers set the demodulated bandwidth with a crystal or mechanical f
/archives//html/Topband/2007-08/msg00098.html (11,480 bytes)

17. Re: Topband: RX 4 square (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Thu, 23 Aug 2007 08:43:10 -0700
My post was not intended to say that it won't work, only that it can complicate things. :) Which is much of what Tom is saying. Also, remember that Tom is designing commercial products, which need to
/archives//html/Topband/2007-08/msg00099.html (8,605 bytes)

18. Re: Topband: RX 4 square (score: 1)
Author: "Tom Rauch" <w8ji@contesting.com>
Date: Thu, 23 Aug 2007 12:53:32 -0400
That's true, and is often why you need a bit more headroom than expected with narrow filters. The major point is the narrow bandwidth means you must have more gain and that additional gain must be a
/archives//html/Topband/2007-08/msg00101.html (9,688 bytes)

19. Re: Topband: RX 4 square (score: 1)
Author: Greg - ZL3IX <zl3ix@inet.net.nz>
Date: Fri, 24 Aug 2007 06:08:31 +1200
My array uses a FET source follower on each element, for the exact reasons that Tom cites. The series capacitance of a 3m element on 160m is around 20pF, a reactance of 4 kohm. It's much easier to ma
/archives//html/Topband/2007-08/msg00103.html (9,786 bytes)

20. Topband: RX 4 square (score: 1)
Author: "Lee K7TJR" <k7tjr@msn.com>
Date: Thu, 23 Aug 2007 14:02:39 -0700
Greg writes: My array uses a FET source follower on each element, for the exact reasons that Tom cites. The series capacitance of a 3m element on 160m is around 20pF, a reactance of 4 kohm. It's much
/archives//html/Topband/2007-08/msg00105.html (9,317 bytes)

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