[UK-CONTEST] Antenna for SSB field day

[Chris G3SJJ]

  As I understand you Andy, we can all now re-vamp our antennas. Multiple elements are allowed so if a single coax comes into the operating position 
it is OK?

SJJ



On 13/08/2010 14:07, Andy Summers wrote:
>    Hi Rob,
>
> It sounds like the precedent has already been set to allow a fan dipole,
> or whatever you want to call multiple elements on a single feedline. So
> I'd go ahead with that unless you're specifically told not to by the
> contest committee.
>
> I'm all for trying not to be too descriptive with the rules, but what I
> do object to is successive committees giving inconsistent replies to
> questions about the rules.
>
> Presumably, the idea of the restricted section is to allow entrants to
> be competitive with a minimum of hardware (and money). So I would
> imagine the phrase 'single element' is used in the parasitic or driven
> array sense. Would you say that your fan dipole is a 4-element array?
> No, you wouldn't!
>
> Chris asked why you would want to use a fan dipole. I can't imagine a
> cheaper, simpler antenna. No ATU required! It also allows instant QSY.
>
> You can get gain of course from a single element, as others have
> mentioned, but you can only optimise this for one band, and the
> feedpoint impedance is now nowhere near 50R. If you try to common lots
> of these higher gain doublets (or loops) it doesn't work, because the
> method relies on power matching to select the appropriate element.
>
> The 'one antenna only' rule must be trying to stop you from having
> separate optimised antennas for each band. Personally, I don't see this
> as a big problem anyway because of the single element and only two
> supports restrictions. But does this rule have to be adhered to over the
> entire contest? If so, then adding wire on in the evening to improve LF
> performance is against the rules.
>
> What about adopting the 21/28MHz antenna rules...
>
> "Restricted - a maximum of 100 watts output and only one antenna per
> band, which must be a single element with a maximum height of 15m"
>
> But maintain the two supports rule?
>
> I think this would make it easier to get a simple station on, and at the
> same time possibly result in better signals and more Q's (especially
> 10/15m).
>
> 73,
> Andy, G4KNO.
>
>
>
> On 13/08/10 01:37, Rob Hall M0RBY wrote:
>> There are only so many variations on a theme! If a fan or common feedpoint
>> dipole is classed as a single element or just a simple doublet of a length
>> left up to the station concerned and any non-amplifying AMU introduced then
>> I might understand the "rules" but they are a tad ambiguous and I have had a
>> few differences of opinion!
>>
>> Again, I will use the proviso that this is my first ever contest and I
>> really, really don't know.
>>
>> 73, Rob
>>
> _______________________________________________
> UK-Contest mailing list
> UK-Contest at contesting.com
> http://lists.contesting.com/mailman/listinfo/uk-contest
>