[OZAPRS] smart meters ?

[Gerard Hill]

The 30m SWR is a little surprising. Usually the resonant dipole 
dominates because its the one sucking most of the current at the centre 
of the fan. The non-resonant ones have little effect. An impedance of 
609+j895 seems way too high. Are you sure the 30m element was included 
in the model? And is there enough separation from the other elements?

VK2TPM built a dual band 40m/30m fan dipole and reports good results. 
SWR is excellent on both bands. See:
<http://blog.marxy.org/2010/10/dual-band-dipole-for-40-and-30m.html>

Cheers ... Gerard, VK2IO

On 11/12/2010 11:51 PM, Damien Gardner Jnr wrote:
> Ewwww, ray was correct - swr on 30m would be 38 (609+j895) on 30m, due
> to the other band dipoles not being full wave etc on 30m.. Ok, will be a
> 40(+15)/20/10 dipole then ;) I had contemplated shoving 5m on the
> bottom, but it might look kinda rediculous in the middle..
>
> --DG
>
> On 11/12/2010 11:35 AM, Damien Gardner Jnr wrote:
>> ooh, really? I'm building one based from here
>> (http://www.hamuniverse.com/multidipole.html) - yard isn't big enough
>> for 40m of dipole for 80m band, so having already built the centre
>> (http://www.rendrag.net/wpg2?g2_itemId=11755), I thought I'd just make
>> the top band 40m, and add 30 in the middle.. Might shove it through
>> MMANA first to see what happens, before I finish cutting and
>> assembling that behemoth, and then pulling it up between the masts..
>>
>> Thanks,
>>
>> DG
>>
>> On 11/12/2010, at 11:26 AM, Ray Wells wrote:
>>
>>> Previous experience of adding a 30m dipole to an existing 20/40/80m
>>> unit was not good. 30m doesn't have a harmonic relationship and it
>>> presented weird and wonderful reactance to the feedpoint. ymmv
>>>
>>> Ray vk2tv
>>>
>>> On 11/12/10 11:19, Damien Gardner Jnr wrote:
>>>> Lol, though monitors aren't allowed in bins, or even hard waste
>>>> roadside pickup :(
>>>>
>>>> I have to say I do like the dell service, where if you order a
>>>> computer with a monitor (can just be a laptop), they pickup the old
>>>> monitor for free and dispose of it :) Though they had a heart attack
>>>> when we asked if we could dispose of 60 21" sony's through that :-p
>>>> Actually, they had enough of a heart attack when we asked about
>>>> ordering 60 LCD's as 'spares' for our existing machines.. ;)
>>>>
>>>> -_DG
>>>>
>>>> Off to build a 40/30/20/10m fan dipole this arvo after work, will be
>>>> interesting to see how much better that is than my TEV-1 vertical!