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5/8 WL Antennas ?
On Dec 29, 8:05*am, RHF wrote:
On Dec 29, 5:42*am, Dave wrote: Telamon wrote: In article , *Dave wrote: John Smith wrote: However, in side-by-side comparisons on 10-6-2m antennas I have built, comparing a 5/8 against the 1/2 (construction methods/materials and matching components identical) ... the actual difference, in the real world, must be less than the width of a meter needle in the readings ... or, put simply, I no longer deal with the extra length required of the 5/8 ... your mileage may vary ... The advantage of a physical height (antenna length) *between 180 and 215 degrees (see previous post regarding the magic number being around 195 degrees) is improved take-off angle and reduced skywave-groundwave interaction, not dramatic nearfield voltage increases. Regarding Mr. Smith's comments above my experience and others is the opposite. 5/8 is a much better performing antenna than a 1/2 wave for local VHF and UHF communications. Well worth the effort to build a 5/8 wave antenna over a 1/2 wave. The 5/8 had some kind of series load coil part way up the whip where the 1/2 wave match/compensation was done at the base so the whip was solid. Sorry I can't more specific then that as those experiments were many years ago. Mr. Smith is still lost in space. - 5/8 wavelength antennas do not require a ground plane, do they? Dave here is a Picture of a . . . 5/8 WL Ground Plane Antennahttp://home.att.net/~wizardoz/cbmw/Images/antenna2.gifhttp://users.belgacom.net/hamradio/schemas/50mc58golf.gifhttp://users.belgacom.net/hamradio/schemas/on6muvhf58verticalantenna.htm *. CBers use 5/8 WL Ground Plane Antennas very often.http://cgi.ebay.com/_W0QQitemZ260334577278 * Elevated Vertical Element * Load Matching Device * Ground Plane Radialshttp://www.pacificaerials.co.nz/antInfo/antennaTypes.htm#3 *. FWIW the 5/8 WL* does go 'mobile' as a Vertical "CB" Antenna but it uses the Car's body as the Ground Plane.http://www.firestik.com/Catalog/FS2-FS5.htm * They do require Tuning {Matching} for Transmithttp://www.firestik.com/Tech_Docs/TUNABLE.htmhttp://www.firestik.com/Catalog/FS2-FS5.htm *. Some where I remember a 5/8 WL Vertical Element on top of a 5/8 WL Vertical Mast {Grounded} as being a very good Antenna : Mono-Pole ? Collinear ? http://www.signalengineering.com/ultimate/verts.jpg : ]========"---------------- : :Ground Level ~ RHF |
Shortwave Radio Listener (SWL) Antennas -versus- Amateur Radio Antennas
"Telamon" wrote in message ... In article , John Smith wrote: Dave wrote: ... A tuner at the antenna is a much better setup. You are doing things right. Most HAM's don't. When Mr. Smith imagines doing this he does it wrong. He's right, too. My sloper is resonant but I still use a tuner to protect the transceiver. I was going to use the Remote Autotuner but don't need it. I get a decent match even on 160. Actually, Telemundo is just the same old idiot, pulling the same old tricks and attempting to appear as a guru to those possessing even less knowledge than himself ... That's our boy Telamon! |
Shortwave Radio Listener (SWL) Antennas -versus- Amateur Radio Antennas
You ridiculous fool. You are the most complete brain dead example of a sub-human which has ever been presented to me ... You dumb twit. We don't care about transmitting. We don't...? Receiving is EQUALLY as important as the transmitting element in the above. Again you dumb twit, we don't care about transmitting. We don't...? Yeah, very sad of you to keep plonking and then continue to read me. I thought this was your trick? What a goofball. Takes one to know one. |
The Difference Between : Shortwave Radio Listener (SWL) -and- Amateur Radio Operators (Hams)
"Telamon" wrote in message ... In article , John Smith wrote: RHF wrote: [stuff] RHF, I have no bone to pick with you, don't fall victim to trolls here which just wish to "stir up chit", to mask their ignorance ... SNIP Now that is funny. One Trolling idiot posting a response to another trolling idiot "don't fall victim to the Trolls". And the hobo of s.r.sw Teleamon, the biggest troll here....is telling other trolls how to act! Hillarious! |
Shortwave Radio Listener (SWL) Antennas -versus- Amateur RadioAntennas
RP wrote:
You ridiculous fool. You are the most complete brain dead example of a sub-human which has ever been presented to me ... You dumb twit. We don't care about transmitting. We don't...? Receiving is EQUALLY as important as the transmitting element in the above. Again you dumb twit, we don't care about transmitting. We don't...? Yeah, very sad of you to keep plonking and then continue to read me. I thought this was your trick? What a goofball. Takes one to know one. Hey, telemundo is a great man, in his own mind, leave him alone ... humor here is sparse, he provides for a needed demand ... :-) Regards, JS |
The Difference Between : Shortwave Radio Listener (SWL) -and-Amateur Radio Operators (Hams)
RP wrote:
... And the hobo of s.r.sw Teleamon, the biggest troll here....is telling other trolls how to act! Hillarious! Hmmm, I can see how you are mistaken; but, brother you are mistaken. telemundo would not even amount to a pimple of a decent trolls hoary old butt ... indeed, I can't imagine the lifeform he could make a pimple on .... grin But then, you know, he already knows that ... :-( Regards, JS |
5/8 WL Antennas ?
RHF wrote:
... Some where I remember a 5/8 WL Vertical Element on top of a 5/8 WL Vertical Mast {Grounded} as being a very good Antenna : Mono-Pole ? Collinear ? http://www.signalengineering.com/ultimate/verts.jpg : ]========"---------------- : :Ground Level ~ RHF . . I don't know if I interpret that, correctly, or not ... however, I think a 5/8 is a FINE performer ... I only complain when having to add the extra length to a 15m - 20m and longer! Indeed, a 1/2 becomes impossible, and quickly--but then, you already know that ... At 6m and below (talking meter length), no problem! Regards, JS |
Transmitting with a "Beverage" Antenna and/or a Ferrite Rod Antenna
RHF wrote:
Dave even Arnie Coro "DXers Unlimited" [RHC] says it can be done ;-} http://www.radiohc.org/Distributions...s/01-1222.html "you can build a ferrite rod loop antenna" . all things are 'possible' : especially for the man who does not know that he can not do it ~ RHF Arnie Coro also recommends the T2FD. |
The Characteristically 50 Ohm Impedance Coax Cable is 'only'50 Ohms Nominal when . . .
RHF wrote:
On Dec 29, 12:37 pm, Telamon wrote: In article , RHF wrote: On Dec 28, 8:36 pm, Telamon wrote: In article , John Smith wrote: SNIP I never even commented on where the placement of the matchbox would be, and, as everyone knows, anywhere along the line you can place it. The best place would be between the coax (feedline) and the antenna- Right. That's because you are to stupid to understand a concept until someone rubes your nose in it. This would not even occur to you until someone else brought it up. -that is, taking for granted that the match from your rig to the feedline is perfect. SNIP You are really worried about the match of 50 ohm coax to your radios 50 ohm output? Now that's funny. IIRC - The Characteristically 50 Ohm Impedance Coax Cable is 'only' 50 Ohms nominal . . . Until you attach something to it. SNIP Nope. The cable itself has a characteristic impedance of some design value. The spacing and size of the conductors along with the dielectric constant of the insulator between them dictates the impedance of the coax. You are confusing the characteristic impedance of the coax with its ability to be an effective transmission line. The coax only behaves as an effective transmission line when both ends of it are terminated at its characteristic impedance. -- Telamon Ventura, California Telamon, OK -restatement- The "Measured" {by You} 50 Ohm Impedance Coax Cable is 'only' 50 Ohms nominal* * Until you attach something to it. -IF- You then attach a Transmitters Output that is a Nominal 50 Ohms to one end of the Coax Cable and then the 'other' end will still "Measure*" about 50 Ohms. * This is what the Antenna will see. However -if- You attach an Unknown "Z" Antenna and Ground to one end of the Coax Cable; then the 'other' end may "Measure*" near or far from 50 Ohms. * This is what the Transmitter will see. That depends on the length of the transmission line. |
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