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References: [ +from:n1rj@adelphia.net: 24 ]

Total 24 documents matching your query.

1. Re: Topband: vertical 160/80m (score: 1)
Author: Roger D Johnson <n1rj@adelphia.net>
Date: Sat, 17 Apr 2004 11:52:07 -0500
I have used several versions of this antenna over the years. The last being the Titanex V-160s. It's approximately 3/8 wavelength on 80m so the base impedance isn't too high. I also discovered that t
/archives//html/Topband/2004-04/msg00129.html (7,974 bytes)

2. Re: Topband: Re: 1837.5 KC/1845 KC CW QRM (score: 1)
Author: Roger D Johnson <n1rj@adelphia.net>
Date: Sat, 17 Apr 2004 12:09:02 -0500
While I have no dog in this particular fight, I did object very strongly to the FCC applying federal muscle to enforce a "voluntary" band plan. While operations of Mr Wehrung, and others, may have be
/archives//html/Topband/2004-04/msg00130.html (9,368 bytes)

3. Re: Topband: two wires Beverage (score: 1)
Author: Roger D Johnson <n1rj@adelphia.net>
Date: Thu, 29 Jul 2004 15:38:07 -0400
Ryszard Tymkiewicz wrote: Hmm...it seems Tom has been right /again/ and I wanted to have good solution in too easy way. Thanks Jacques and Ulli for measurements..the values of looses are so high that
/archives//html/Topband/2004-07/msg00089.html (9,581 bytes)

4. Re: Topband: Two Wire Beverage Query... (score: 1)
Author: Roger D Johnson <n1rj@adelphia.net>
Date: Fri, 20 Aug 2004 12:46:12 -0400
Tom Rauch wrote: Second, if it did work to crate a low resistance path the effect would only be to make the antenna stop working. Beverages depend on ground losses to function. I respectfully beg to
/archives//html/Topband/2004-08/msg00024.html (8,812 bytes)

5. Re: Topband: Vertical SWR problem (score: 1)
Author: Roger D Johnson <n1rj@adelphia.net>
Date: Sun, 28 Nov 2004 10:38:54 -0500
I've just installed a Titanex V160S vertical (87') with a V160AS (160m only) tuning unit. Yesterday I connected 12 radials (130') each, adjusted the taps on the tuning unit coil with an MFJ SWR analy
/archives//html/Topband/2004-11/msg00242.html (8,911 bytes)

6. Re: Topband: Efficiently Matching Low-Impedance Antennas to 50ohms (score: 1)
Author: Roger D Johnson <n1rj@adelphia.net>
Date: Fri, 07 Oct 2005 12:06:39 -0400
Let me throw a small monkey wrench into this. If you have an accurate set of measurements at the base of the antenna and a Smith chart program, you can achieve a wider bandwidth by NOT adjusting the
/archives//html/Topband/2005-10/msg00029.html (8,013 bytes)

7. Topband: DX Engineering ARAV-1P preamp (score: 1)
Author: Roger D Johnson <n1rj@adelphia.net>
Date: Tue, 01 Nov 2005 10:58:35 -0500
I'm about ready to erect my receiving 4-square. The info supplied by DX Engineering about setting the preamp jumpers is very sparse. I contacted them to see if they had any info about the overall fre
/archives//html/Topband/2005-11/msg00006.html (7,384 bytes)

8. Re: Topband: Arcing Prevention (score: 1)
Author: Roger D Johnson <n1rj@adelphia.net>
Date: Thu, 10 Nov 2005 12:42:07 -0500
harmonic relationship) of matching - does this ring Hi Pete... I have a Titanex V-160 which is about 87 ft tall. While playing around with EZNEC and a Smith chart, I discovered a matching sytem that
/archives//html/Topband/2005-11/msg00089.html (8,352 bytes)

9. Re: Topband: 1820.4 carrier (score: 1)
Author: Roger D Johnson <n1rj@adelphia.net>
Date: Fri, 09 Dec 2005 21:19:50 -0500
From Limington, Me (abt 25 mi wnw of Portland) the sig is best to the NE on my new 4-square rx array. 73, Roger -- Remember the USS Liberty (AGTR-5) http://ussliberty.org/ ___________________________
/archives//html/Topband/2005-12/msg00119.html (7,290 bytes)

10. Topband: 1820.4 carrier (score: 1)
Author: Roger D Johnson <n1rj@adelphia.net>
Date: Sat, 10 Dec 2005 15:51:49 -0500
I think we must use some caution using Beverage antennas to DF this signal. Beverages have significant minor lobes that can make the signal, especially high angle ones, seem to come from another dire
/archives//html/Topband/2005-12/msg00130.html (7,300 bytes)

11. Re: Topband: Building a practical vertical from Al tubing (score: 1)
Author: Roger D Johnson <n1rj@adelphia.net>
Date: Thu, 05 Jan 2006 13:06:16 -0500
One aspect of this that always seems to be a problem is how to attach the guys to the vertical. I'd be interested to hear how others have accomplished this in a matter that is enduring. 73, Roger --
/archives//html/Topband/2006-01/msg00071.html (7,895 bytes)

12. Topband: Preamps (score: 1)
Author: Roger D Johnson <n1rj@adelphia.net>
Date: Mon, 27 Feb 2006 12:00:41 -0500
Anyone have any info concerning the performance of the Ameco nuvistor preamps vs their dual gate MOSFET types? 73, Roger -- Remember the USS Liberty (AGTR-5) http://ussliberty.org/ __________________
/archives//html/Topband/2006-02/msg00217.html (6,199 bytes)

13. Re: Topband: Relays in RX array (score: 1)
Author: Roger D Johnson <n1rj@adelphia.net>
Date: Thu, 23 Mar 2006 08:34:01 -0500
Info on contact materials see: http://relays.tycoelectronics.com/app_pdfs/13c3236.pdf It appears that, for RX applications, gold is the material of choice. 73, Roger -- Remember the USS Liberty (AGTR
/archives//html/Topband/2006-03/msg00162.html (8,446 bytes)

14. Re: Topband: Relays in *TX* array (score: 1)
Author: Roger D Johnson <n1rj@adelphia.net>
Date: Thu, 23 Mar 2006 08:40:43 -0500
My preference would be a vacuum relay such as the Jennings RJ-1A. They're fast, sealed, relatively inexpensive, and will handle the power easily. I've also seen a bunch of Russian vacuum relays about
/archives//html/Topband/2006-03/msg00163.html (7,454 bytes)

15. Re: Topband: Relays in *TX* array (score: 1)
Author: Roger D Johnson <n1rj@adelphia.net>
Date: Thu, 23 Mar 2006 09:38:14 -0500
Trudging several hundred feet, through 3 ft of snow during a Maine winter, to futz with a recalcitrant relay at the base of the antenna will make one wish he had spent a few extra bucks for the vacuu
/archives//html/Topband/2006-03/msg00165.html (8,608 bytes)

16. Re: Topband: Relay types-Tx and Rx (score: 1)
Author: Roger D Johnson <n1rj@adelphia.net>
Date: Thu, 23 Mar 2006 13:23:49 -0500
I'm getting a bit confused! We have two different relay discussions that have seemingly merged into one. The first questioner asked about relays for a strictly receive application. Unless one wants t
/archives//html/Topband/2006-03/msg00174.html (8,659 bytes)

17. Topband: Modeling DX Engineering 4 square rx array (score: 1)
Author: Roger D Johnson <n1rj@adelphia.net>
Date: Thu, 01 Jun 2006 15:43:58 -0400
Is there an easy way to model this array in EZNEC? It would be nice to enter the feed system and be able to sweep a band of frequencies without having to change anything. 73, Roger -- Remember the US
/archives//html/Topband/2006-06/msg00000.html (6,076 bytes)

18. Re: Topband: plasma TV RFI? (score: 1)
Author: Roger D Johnson <n1rj@adelphia.net>
Date: Mon, 04 Dec 2006 21:18:11 -0500
Virtually everything you want to know: http://www.justradios.com/safetytips.html 73, Roger -- Remember the USS Liberty (AGTR-5) http://ussliberty.org/ _______________________________________________
/archives//html/Topband/2006-12/msg00055.html (8,588 bytes)

19. Topband: 4 square receiving array (score: 1)
Author: Roger D Johnson <n1rj@adelphia.net>
Date: Tue, 30 Jan 2007 15:08:20 -0500
I need some educating. I always believed that it was the LOAD at the end of a coaxial line that established the SWR and phase shift. With a receiving antenna, that load is the receiver or, in the cas
/archives//html/Topband/2007-01/msg00471.html (7,826 bytes)

20. Topband: Cushcraft MA-160v (score: 1)
Author: Roger D Johnson <n1rj@adelphia.net>
Date: Thu, 22 Feb 2007 12:49:47 -0500
I've seen several questions about this antenna lately. I modeled it for a VE using EZNEC4. I worked from the CC instruction manual so my dimensions might be off a bit but I'm sure I'm in the ballpark
/archives//html/Topband/2007-02/msg00247.html (6,944 bytes)

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