Search String: Display: Description: Sort:

Results:

References: [ +subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*\[TenTec\]\s+was\s+OT\:\s+Indoor\s+Antenna\:\s+re\s+B\&W\s+type\s+terminated\s+dipoles\s*$/: 25 ]

Total 25 documents matching your query.

1. Re: [TenTec] was OT: Indoor Antenna: re B&W type terminated dipoles (score: 1)
Author: Stuart Rohre <rohre@arlut.utexas.edu>
Date: Fri, 03 Dec 2010 15:52:22 -0600
On some bands as much as 1/2 of your power goes into heating the resistor. The resistor is there to provide a smoother SWR over the range, which for which these antennas might be used by government,
/archives//html/TenTec/2010-12/msg00064.html (9,058 bytes)

2. Re: [TenTec] was OT: Indoor Antenna: re B&W type terminated dipoles (score: 1)
Author: "Rick - NJ0IP / DJ0IP" <Rick@DJ0IP.de>
Date: Fri, 3 Dec 2010 16:53:39 -0600
You're jumping to conclusions, Stuart. I have a 65 ft. vertical for transmitting. I was looking for a receive antenna for 160 and 80m. (My Eagle already has the mod with the 2x Phono jacks so I can u
/archives//html/TenTec/2010-12/msg00066.html (10,447 bytes)

3. Re: [TenTec] was OT: Indoor Antenna: re B&W type terminated dipoles (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Fri, 03 Dec 2010 17:05:47 -0600
The low long wire is a Beverage and the termination is for RF. It works down to DC as does the antenna though it looses its directivity when it gets short in wavelengths. Overall its rotten at receiv
/archives//html/TenTec/2010-12/msg00067.html (10,116 bytes)

4. Re: [TenTec] was OT: Indoor Antenna: re B&W type terminated dipoles (score: 1)
Author: "Rick - NJ0IP / DJ0IP" <Rick@DJ0IP.de>
Date: Fri, 3 Dec 2010 18:22:59 -0600
Jerry, thanks for the clarity on the ground. I wasn't sure if the ground stake for the termination was considered to be an RF or DC ground. As for the performance of the Beverage, with all due respec
/archives//html/TenTec/2010-12/msg00069.html (12,377 bytes)

5. Re: [TenTec] was OT: Indoor Antenna: re B&W type terminated dipoles (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Fri, 03 Dec 2010 19:03:56 -0600
Rotten based on recovered signal strength. A low efficiency antenna that can require a low noise preamp because the typical HF receiver has relatively poor sensitivity due to the normal level of atmo
/archives//html/TenTec/2010-12/msg00071.html (11,569 bytes)

6. Re: [TenTec] was OT: Indoor Antenna: re B&W type terminated dipoles (score: 1)
Author: "Rick - NJ0IP / DJ0IP" <Rick@DJ0IP.de>
Date: Fri, 3 Dec 2010 20:05:09 -0600
Jerry, my post wasn't based on technical theory. I'm sure you are correct in theory. I was just referring to years and year and years (over 20) of using these antennas during contest operations and h
/archives//html/TenTec/2010-12/msg00076.html (13,412 bytes)

7. Re: [TenTec] was OT: Indoor Antenna: re B&W type terminated dipoles (score: 1)
Author: Stuart Rohre <rohre@arlut.utexas.edu>
Date: Fri, 03 Dec 2010 22:10:06 -0600
Some terminated antennas such as the terminated Beverage are operating as a high impedance traveling wave antenna, and thus a resistor to even lossy ground would look like a lower RF impedance than t
/archives//html/TenTec/2010-12/msg00077.html (10,382 bytes)

8. Re: [TenTec] was OT: Indoor Antenna: re B&W type terminated dipoles (score: 1)
Author: "Rick - NJ0IP / DJ0IP" <Rick@DJ0IP.de>
Date: Fri, 3 Dec 2010 23:04:36 -0600
OK Stuart. I guess what I have gleaned from yours and Jerry's post is, in the case of a Beverage or similar RX antenna, it is both a DC and RF ground. I have always been leery of running an antenna w
/archives//html/TenTec/2010-12/msg00078.html (11,847 bytes)

9. Re: [TenTec] was OT: Indoor Antenna: re B&W type terminated dipoles (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Sat, 04 Dec 2010 07:57:05 -0600
Part of that computation is flawed because the simple computations used neglect the reduction in current from radiation along the wire. The longer the rhombic the less current reaches the end. K0EMS
/archives//html/TenTec/2010-12/msg00079.html (12,816 bytes)

10. Re: [TenTec] was OT: Indoor Antenna: re B&W type terminated dipoles (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Sun, 05 Dec 2010 12:54:17 -0600
Typical terminating resistors for Beverage run 600 to 1000 ohms, a lot higher than a ground rod resistance. That efficient? _______________________________________________ TenTec mailing list TenTec@
/archives//html/TenTec/2010-12/msg00117.html (11,231 bytes)

11. Re: [TenTec] was OT: Indoor Antenna: re B&W type terminated dipoles (score: 1)
Author: Jim WA9YSD <wa9ysd@yahoo.com>
Date: Tue, 7 Dec 2010 03:58:44 -0800 (PST)
Any antenna for that matter looses 1/2 their power or more when operated on a band that it is not designed for. Efficiency for a folded dipole has a factor of around 0.98 Efficiency for the common di
/archives//html/TenTec/2010-12/msg00176.html (9,362 bytes)

12. Re: [TenTec] was OT: Indoor Antenna: re B&W type terminated dipoles (score: 1)
Author: Hank Garretson <w6sx@arrl.net>
Date: Tue, 7 Dec 2010 07:06:10 -0800
Oh Dear! Advice to everyone, read Maxwell's Reflections. 73, Hank, W6SX Mammoth Lakes, California Elevation 8083 feet in John Muir's Range of Light On Tue, Dec 7, 2010 at 3:58 AM, Jim WA9YSD <wa9ysd@
/archives//html/TenTec/2010-12/msg00180.html (8,345 bytes)

13. Re: [TenTec] was OT: Indoor Antenna: re B&W type terminated dipoles (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Tue, 07 Dec 2010 09:12:06 -0600
Why do you say that? I don't agree. It may not radiate in the direction it did on the fundamental. The system may loose power from matching network losses when the impedance is obnoxious to match, an
/archives//html/TenTec/2010-12/msg00181.html (9,614 bytes)

14. Re: [TenTec] was OT: Indoor Antenna: re B&W type terminated dipoles (score: 1)
Author: Rsoifer@aol.com
Date: Tue, 7 Dec 2010 10:36:04 -0500 (EST)
Theoretical efficiency is usually figured as if the antenna is in free space, but of course it isn't. Height above ground, ground characteristics, surrounding objects, etc., all must be taken into ac
/archives//html/TenTec/2010-12/msg00182.html (9,558 bytes)

15. Re: [TenTec] was OT: Indoor Antenna: re B&W type terminated dipoles (score: 1)
Author: Steve Hunt <steve@karinya.net>
Date: Tue, 07 Dec 2010 18:02:09 +0000
"Efficiency" is a term well understood by most professional engineers as: Efficiency = Pout/Pin If we are talking specifically about an antenna's efficiency - not an antenna *system* - the expression
/archives//html/TenTec/2010-12/msg00188.html (9,367 bytes)

16. Re: [TenTec] was OT: Indoor Antenna: re B&W type terminated dipoles (score: 1)
Author: Ken Brown <ken.d.brown@hawaiiantel.net>
Date: Tue, 07 Dec 2010 20:08:09 -1000
Yep, Just be sure to separate the radiated power at the RF frequency that the transmitter produces from the power radiated as infrared wavelengths (heat), and you've got it right. Which is what you
/archives//html/TenTec/2010-12/msg00203.html (10,550 bytes)

17. Re: [TenTec] was OT: Indoor Antenna: re B&W type terminated dipoles (score: 1)
Author: Jim WA9YSD <wa9ysd@yahoo.com>
Date: Tue, 7 Dec 2010 23:14:19 -0800 (PST)
A floded dipole has Efficiency rating of 1 a dipole is 0.1 am I mistaking this for coupling factor? The ability for the dipole to couple into the elements of a yagi? Stay on course, fight a good figh
/archives//html/TenTec/2010-12/msg00204.html (8,157 bytes)

18. Re: [TenTec] was OT: Indoor Antenna: re B&W type terminated dipoles (score: 1)
Author: "mgorniakgw" <mgorniak@genesiswireless.us>
Date: Wed, 8 Dec 2010 12:54:21 -0600
Bingo! As a prominent professional antenna designer once told me: "The best antenna that I can build is not going to work very well if you install it at the bottom of an elevator shaft." 73, Mike NM7
/archives//html/TenTec/2010-12/msg00214.html (8,959 bytes)

19. Re: [TenTec] was OT: Indoor Antenna: re B&W type terminated dipoles (score: 1)
Author: Stuart Rohre <rohre@arlut.utexas.edu>
Date: Wed, 08 Dec 2010 23:28:27 -0600
The efficiency of a dipole is nearly 100 per cent or 1.0. Depending on construction, it might be 99 per cent, (0,99, 0,98, etc.) It is as others stated a statement of power minus losses, giving what
/archives//html/TenTec/2010-12/msg00234.html (9,122 bytes)

20. Re: [TenTec] was OT: Indoor Antenna: re B&W type terminated dipoles (score: 1)
Author: Ken Brown <ken.d.brown@hawaiiantel.net>
Date: Wed, 08 Dec 2010 22:23:09 -1000
As a dipole driven element is coupled to parasitic elements, it's radiation resistance becomes lower. It is no longer a 75 ohm feedpoint impedance, but rather something much lower. This is why drive
/archives//html/TenTec/2010-12/msg00237.html (10,069 bytes)


This search system is powered by Namazu