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#21
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About Baluns - What is the Best Balun ?
In article ,
David wrote: On Sat, 27 Jan 2007 17:55:17 -0800, Telamon wrote: In article , David wrote: On Sat, 27 Jan 2007 12:05:57 -0800, Telamon wrote: Snip That would depend on the application like anything engineered. In general the current type would be best for Hertzian antennas and I would only use the voltage type on random/long wire Marconi type antennas. http://www.moonraker.com.au/techni/q...everticals.htm What does this have to do with BALUNs? A random wire is not a Marconi antenna. A Marconi antenna is a 1/4 wave vertical with a formal ground screen/radial system providing a second 1/4 wave image below the earth which allows the system to load like (but radiate like) a half-wave antenna. A Marconi antenna is ca. 36 Ohms and needs no 9:1 or 10:1 transformer. A Marconi antenna is not necessarily a quarter wave vertical but is a quarter wave or longer. In the beginning of the development of radio technology there came about two main styles of antennas. A Marconi style is a one element where the other is a ground. Hertzian's are balanced antennas with two elements in the air. Irrespective of antenna style 1/4 wave is a basic element. Single element antennas can pick up static electricity that can damage radio front ends. Using a voltage type UNUN is best type to use due to the separate windings. The voltage type also lends itself to fractional impedance transformations. Balanced antennas can be of a closed RF loop design where the higher efficiency of the current type transformer is a plus and static electricity is not an issue. -- Telamon Ventura, California |
#22
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About Baluns - What is the Best Balun ?
On Sun, 28 Jan 2007 17:35:51 GMT, Telamon
wrote: Single element antennas can pick up static electricity that can damage radio front ends. Using a voltage type UNUN is best type to use due to the separate windings. The voltage type also lends itself to fractional impedance transformations. Shunt Feed. Delta Match. |
#23
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About Baluns - What is the Best Balun ?
In article ,
David wrote: On Sun, 28 Jan 2007 17:35:51 GMT, Telamon wrote: Single element antennas can pick up static electricity that can damage radio front ends. Using a voltage type UNUN is best type to use due to the separate windings. The voltage type also lends itself to fractional impedance transformations. Shunt Feed. Delta Match. I though we were discussing BALUNs. Shunt feed and delta match are tuned circuits with narrow bandwidth whereas a BALUN or UNUNs are broadband. SWLs are not transmitting so the need to tune the antennas output match at some frequency is not desirable. -- Telamon Ventura, California |
#24
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About Baluns - What is the Best Balun ?
On Jan 28, 7:32 pm, Telamon wrote: In article , David wrote: On Sun, 28 Jan 2007 17:35:51 GMT, Telamon wrote: Single element antennas can pick up static electricity that can damage radio front ends. Using a voltage type UNUN is best type to use due to the separate windings. The voltage type also lends itself to fractional impedance transformations. Shunt Feed. Delta Match.I though we were discussing BALUNs. Shunt feed and delta match are tuned circuits with narrow bandwidth whereas a BALUN or UNUNs are broadband. SWLs are not transmitting so the need to tune the antennas output match at some frequency is not desirable. -- Telamon Ventura, California Telamon - Thank you for pointing that out. The Topic is : About Baluns - What is the Best Balun ? So . . . Whats between your Shortwave Listening (SWL) Antenna and the Coax Cable feed-in-line ? ? ? - iane ~ RHF |
#25
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About Baluns - What is the Best Balun ?
On 28 Jan 2007 20:20:27 -0800, "RHF"
wrote: So . . . Whats between your Shortwave Listening (SWL) Antenna and the Coax Cable feed-in-line ? ? ? - iane ~ RHF . . . . Palomar MLB. I thought we already settled this? Besides, Paranoid Boy changed the subject to Marconi antennas, which are not broadband, and then said a transformer was desirable for grounding and I pointed out 2 feed mechanisms that pass DC ground. Try to keep up. |
#26
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About Baluns - What is the Best Balun ?
In article ,
David wrote: On 28 Jan 2007 20:20:27 -0800, "RHF" wrote: So . . . Whats between your Shortwave Listening (SWL) Antenna and the Coax Cable feed-in-line ? ? ? - iane ~ RHF . . . . Palomar MLB. I thought we already settled this? Besides, Paranoid Boy changed the subject to Marconi antennas, which are not broadband, and then said a transformer was desirable for grounding and I pointed out 2 feed mechanisms that pass DC ground. Try to keep up. You are one funny guy. You tell the OP that the that subject is something other than what he meant. Sure thing buddy. The subject and question "About Baluns - What is the Best Balun ?" I addressed what the best type would be based on antenna type. I did not change the topic thank you very much. -- Telamon Ventura, California |
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