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FC-40 and Dipole?

pewomail
 

Hi everybody,
I'm new to ham radio and plan to buy some equipment soon (Xmax's
comming up ;-)
I was thinking FT-857D and Buddipole; since many package-deals shave
50% off of a FC-40, I'm wondering if I can use it to fine-tune a dipole
antenna.
I gather there is a difference between balanced and un-balanced
antennas; let me see if I get this straight: since solid-state
transceivers feature unbalanced final stages, it is desireable to
insert a balun between the radio and the dipole, which is a balanced
antenna (I guess this is to avoid currents on the outer side of the
coax cable). The FC-40's output is geared towards wire antennas and is
probably un-balanced, right!?
(1) Can you comment on the use of the FC-40 with a dipole antenna (and
the Buddipole in particular).
(2) How is the LDG Z11Pro tuner different from the FC-40.
Your help is appreciated!
Thanks,
Wolf
[email protected]
 

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In a message dated 12/6/2005 7:11:12 AM Central Standard Time, pewomail@... writes:
?
>I'm new to ham radio and plan to buy some equipment soon (Xmax's
>comming up ;-)
?
I have the FT-857D and the FC-40, no experience with the Buddipole.
?
>FC-40, I'm wondering if I can use it to fine-tune a dipole antenna.
?
The FC-40 will work with random wires, dipoles, loops and other configurations of wire antennas, BUT there is probably no single wire length that will allow operation on ALL bands.? There is no "free lunch" involved -- shorter antennas WILL be much less efficient radiators (and receivers) on the 80 and 160 meter bands, even with a perfect "match" by the FC-40.
?
As I understand the Buddipole, (from reading only) one is able to change coils to change bands, and match to different frequencies within the band by means of movable taps on the coil.? How far "out of (coil) band" one might be able to venture with the FC-40 is something you might want to email the Buddipole folks about.?
?
>I gather there is a difference between balanced and un-balanced
>antennas; let me see if I get this straight: since solid-state
>transceivers feature unbalanced final stages, it is desireable to
>insert a balun between the radio and the dipole, which is a balanced
>antenna (I guess this is to avoid currents on the outer side of the
>coax cable). The FC-40's output is geared towards wire antennas and is
>probably un-balanced, right!?
?
The Coax feed from the FT-857-D is unbananced into the FC-40.? The FC-40 is expecting to feed a balanced antenna -- one side hot, one to ground/counterpoise.? In the (in my experience) LIKELY event that you are experienceing RF on the coax, line isolaters (see radioworks.com or others -- no I don't work for them) will eliminate that problem.? Some snap-on ferrites can be used on the supplied 16-foot control cable between the CAT port of the FT-857D and the FC-40 to preculde RF pickup on the control line.
?
The FC-40, and the similar-function products by SGC,?are more properly termed "antenna couplers" and are located?at or very near?(fewer inches are better) the antenna feed point.
?
Some other products, more properly called "tuners" sit at/near the operating position and may not require a CAT connetion.? Additionally, some feed out with coax.
?
Yaesu sends one 16' control cable that must be connected between the CAT ports on the radio and the FC-40 (extensions of 16' length are about $35US from Yaesu).? OK for mobile installations, but for fixed use one will probably need more control cable length (remember to use ferrites to avoid RF pickup).? With the FC-40 plugged into the CAT port?of the FT-857D, there is no provision for using?a?computer to control the transciver.?
Hope this helps with your decision.
?
73.
Gary
?
Kyle N4NSS
 

My loop or as I call it, my electric fence antenna works on all bands with no problem.

gkstemple@... wrote:
In a message dated 12/6/2005 7:11:12 AM Central Standard Time, pewomail@... writes:
?
>I'm new to ham radio and plan to buy some equipment soon (Xmax's
>comming up ;-)
?
I have the FT-857D and the FC-40, no experience with the Buddipole.
?
>FC-40, I'm wondering if I can use it to fine-tune a dipole antenna.
?
The FC-40 will work with random wires, dipoles, loops and other configurations of wire antennas, BUT there is probably no single wire length that will allow operation on ALL bands.? There is no "free lunch" involved -- shorter antennas WILL be much less efficient radiators (and receivers) on the 80 and 160 meter bands, even with a perfect "match" by the FC-40.
?
As I understand the Buddipole, (from reading only) one is able to change coils to change bands, and match to different frequencies within the band by means of movable taps on the coil.? How far "out of (coil) band" one might be able to venture with the FC-40 is something you might want to email the Buddipole folks about.?
?
>I gather there is a difference between balanced and un-balanced
>antennas; let me see if I get this straight: since solid-state
>transceivers feature unbalanced final stages, it is desireable to
>insert a balun between the radio and the dipole, which is a balanced
>antenna (I guess this is to avoid currents on the outer side of the
>coax cable). The FC-40's output is geared towards wire antennas and is
>probably un-balanced, right!?
?
The Coax feed from the FT-857-D is unbananced into the FC-40.? The FC-40 is expecting to feed a balanced antenna -- one side hot, one to ground/counterpoise.? In the (in my experience) LIKELY event that you are experienceing RF on the coax, line isolaters (see radioworks.com or others -- no I don't work for them) will eliminate that problem.? Some snap-on ferrites can be used on the supplied 16-foot control cable between the CAT port of the FT-857D and the FC-40 to preculde RF pickup on the control line.
?
The FC-40, and the similar-function products by SGC,?are more properly termed "antenna couplers" and are located?at or very near?(fewer inches are better) the antenna feed point.
?
Some other products, more properly called "tuners" sit at/near the operating position and may not require a CAT connetion.? Additionally, some feed out with coax.
?
Yaesu sends one 16' control cable that must be connected between the CAT ports on the radio and the FC-40 (extensions of 16' length are about $35US from Yaesu).? OK for mobile installations, but for fixed use one will probably need more control cable length (remember to use ferrites to avoid RF pickup).? With the FC-40 plugged into the CAT port?of the FT-857D, there is no provision for using?a?computer to control the transciver.?
Hope this helps with your decision.
?
73.
Gary
?



Kyle W. Jeske??? N4NSS?@?arrl dot net
Licensed since 1966.
Level III Certified ARECC, Skywarn Advanced
FISTS: #9760??Grid: EL87qu 27.843927N ??? -82.642812W??
Backpacker, QRP, Antennas, and Stealth?Antennas
My site:
?

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[email protected]
 

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n4nss@... writes:
?
>My loop or as I call it, my electric fence antenna works on all bands with no problem.
?
Great.? I'm considering trying one of these next spring on a visit to my folks, who have one around their garden.? The fence charger is not needed in daylight.
?
Could you provide more details -- length?, height above ground?, more-or-less level terrain?, etc.???
?
I wasn't thinking of the greater-than-a-full-wavelength on 160 meters L O? O? O N? N G G wire, but if it's up, insulated and not energized for other purposes at the time, why not?try it!!
?
73
Gary
KC9DJQ
?
Kyle N4NSS
 

I used fiberglass sticks which were used when I was keeping some small farm animals.? These sticks are four feet long.? I nailed one to each of the 4 inch by 4 inch posts of the 6 foot wood fence which goes around the back yard.? I put a wire just above the wood fence and another about two feet above that one.? These wires are both tied together at the far end.? The total lenght is around 200 feet.? I think that because the wires are spaced it might make the diameter of the wire thicker which give wider bandwith, like a cage antenna.? This tunes 160 thru 6 meters.? So far I don't have any contacts on 160.? I use it on all the other bands with very good results.

gkstemple@... wrote:
n4nss@... writes:
?
>My loop or as I call it, my electric fence antenna works on all bands with no problem.
?
Great.? I'm considering trying one of these next spring on a visit to my folks, who have one around their garden.? The fence charger is not needed in daylight.
?
Could you provide more details -- length?, height above ground?, more-or-less level terrain?, etc.???
?
I wasn't thinking of the greater-than-a-full-wavelength on 160 meters L O? O? O N? N G G wire, but if it's up, insulated and not energized for other purposes at the time, why not?try it!!
?
73
Gary
KC9DJQ
?

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