Hi Tom.
Yes, I understand that, but my point is that advertising the antenna as a 5
bander opens up the opportunity to do the same thing for virtually any
antenna as anything at the end of a coax will radiate on 20-10 mtrs.
F12's advertising should be questioned a little more in my opinion, people
think they buy an antenna for 5 bands when they don't. F12 sell a tribander
that is "forced" to run on WARC-bands, with properties that are so poor
that the antenna even shoots the other way on one band.
Anyone else advertising like they do would be flamed, but they get away
with it. Question is why..
73/Peter SM2CEW
At 00:31 2002-03-07 , you wrote:
>A dipole does NOT need to be resonant to radiate,
>so the split dipole feed on the C3 antennas is simply
>matched at the transmitter through the coax on the
>WARC bands. Yes, additional feedline loss is incurred
>but it does work.
>
>Tom N4KG
>
>On Wed, 06 Mar 2002 Peter Sundberg <sm2cew@telia.com> writes:
>> Fellow towertalkians, regarding Jims questions;
>>
>> Am I right in assuming that the F12 yagis are designed for 20, 15
>> and 10
>> mtrs and 17/12 mtrs only work because there is a load at the end of
>> the
>> coax and you need to use a tuner to operate there..
>> Performance on those bands seems mediocre at the most. Kinda like
>> stating
>> that a 20 mtr monobander also works on 17 and 12 mtrs.. of course it
>> does.
>>
>> Or am I missing something ?
>>
>> 73/Peter SM2CEW
>> www.qsl.net/sm2cew
>>
>>
>>
>> At 07:27 2002-03-06 , you wrote:
>> >Hi all,
>> >
>> >Getting ready to replace the old HyGain TH3 with something better.
>> Have
>> >decided on the F12 C4 series with the 2 el 40 as this seems to best
>> fit
>> >the constraints of my 33 x 120 ft city lot. (Gotta get something
>> on 40
>> >better than the present droopy dipole.) The antenna will be at
>> about 50
>> >ft. Rotor and mast will be upgraded as required. Main interest is
>>
>> >contesting. Trying to decide between the XL and the SXL.
>> >
>> > From looking at the specs I don't see any significant difference
>> in
>> >gain or F/B between the two models.
>> >
>> >The XL has better 2:1 SWR bandwidth on 10 (1.5 MHz vs 1.1 MHz) but
>> do I
>> >care? i.e. How often am I going to be above 29.1 in a contest?
>> Also,
>> >the most power I run in a contest is 150W and the MkV can put out
>> 200W
>> >so I should be able to get 150W into the antenna at frequencies
>> higher
>> >than 28.1 even if the SWR is getting up past 3:1.
>> >
>> >On 12m the XL max SWR is about 3.2:1 vs about 4:1 for the SXL but
>> it
>> >isn't a contest band so that isn't much of an issue.
>> >
>> >SWR specs are identical for the other bands.
>> >
>> >The SXL is smaller, lighter and cheaper than the XL.
>> >
>> > From the above it would seem that the appropriate choice for me is
>> the SXL.
>> >
>> >I would be interested in any comments as to the validity of my
>> choice.
>> > i.e. do you know something that I don't about these antennas which
>>
>> >might swing the choice the other way?
>> >
>> >TIA for your help.
>> >
>> >73 de Jim Smith VE7FO
>> >
>> >
>> >
>> >_______________________________________________
>> >Towertalk mailing list
>> >Towertalk@contesting.com
>> >http://lists.contesting.com/mailman/listinfo/towertalk
>> >
>>
>>
>>
>> _______________________________________________
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>> Towertalk@contesting.com
>> http://lists.contesting.com/mailman/listinfo/towertalk
>
>
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