[OZAPRS] smart meters ?
Ray Wells
vk2tv at exemail.com.au
Sun Dec 12 08:10:29 EST 2010
With EZNEC the various wires have to attach to a single segment that
contains the source. As I understand it, the NEC engine can't handle
multiple wires attached to the source, hence the single, centre segment.
I haven't looked at fan dipoles in EZNEC yet, I'm too busy trying sort
out the Wells' Quadrant* for 30m.
* Wells' Quadrant comprises two half-wave elements at right angles to
each other at the feed point. The resulting radiation pattern is
essentially omni-directional horizontal polarisation, within about
1.5dB, according to EZNEC.
Ray vk2tv
On 12/12/10 07:53, Damien Gardner Jnr wrote:
> I'm thinking I got too technical.. either fan dipoles are completely
> flawed, or antenna modelling just doesn't work on them.. I finally
> finished putting the 20+10 dipoles in (lordy I re-learnt a lot of trig
> last night!), and it looks absolutely horrid for SWR.. yet everything
> I can find on the 'net suggests 1.5:1 on each band.. I might just
> build it and see ;)
>
> --DG
>
> On 12/12/2010, at 6:30 AM, Ray Wells wrote:
>
>> Gee, I didn't get that technical <grin>
>>
>> Ray vk2tv
>>
>> On 11/12/10 23:51, 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!
>>>>>>
>>>>>>
>>>>>> On 11/12/2010, at 10:54 AM, Ray Wells wrote:
>>>>>>
>>>>>>> If I had a garbage service I'd toss the monitor in the bottom of
>>>>>>> the wheelie bin and it would just disappear but, no garbage
>>>>>>> service means a visit to the tip. I wonder how many monitors my
>>>>>>> big dam will hold <g>
>>>>>>>
>>>>>>>
>>>>>>> Ray vk2tv
>>>>>>>
>>>>>>> On 11/12/10 10:43, Damien Gardner Jnr wrote:
>>>>>>>> On 11/12/2010, at 10:38 AM, Ray Wells wrote:
>>>>>>>>
>>>>>>>>> You mentioned monitors. I recently took two dead CRT monitors
>>>>>>>>> to the tip (I don't have a garbage service) and was informed
>>>>>>>>> there is a (NSW) government enforced $5.00 fee per monitor to
>>>>>>>>> leave them at the tip. How's that for a hidden tax? I wonder
>>>>>>>>> how many dead monitors will now be given swimming lessons?
>>>>>>>>
>>>>>>>> Wow, that's not bad - ACT govt charges $50/monitor to dump them
>>>>>>>> at the tip.. - when we replaced our 21" sony CRT's with 19"
>>>>>>>> LCD's back in 2005 (worked out we'd pay back the costs of
>>>>>>>> replacing 3x21" 500W crt's with 3x19" 50W LCD's per Desk, in
>>>>>>>> just under 6 months!), we ended up shoving them all into the
>>>>>>>> dumpster out the back over a couple of weeks..
>>>>>>>>
>>>>>>>> --DG
>>>>>>>>
>>>>>>>>
>>>>>>>> Damien Gardner Jnr
>>>>>>>> VK2TDG. Dip EE. GradIEAust
>>>>>>>> rendrag at rendrag.net <mailto:rendrag at rendrag.net> -
>>>>>>>> http://www.rendrag.net/
>>>>>>>> --
>>>>>>>> We rode on the winds of the rising storm,
>>>>>>>> We ran to the sounds of thunder.
>>>>>>>> We danced among the lightning bolts,
>>>>>>>> and tore the world asunder
>>>>>>>>
>>>>>>>>
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>>>>>>
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>>>
>>> --
>>>
>>> Damien Gardner Jnr
>>> VK2TDG. Dip EE. GradIEAust
>>> rendrag at rendrag.net -http://www.rendrag.net/
>>> --
>>> We rode on the winds of the rising storm,
>>> We ran to the sounds of thunder.
>>> We danced among the lightning bolts,
>>> and tore the world asunder
>>>
>>>
>>> _______________________________________________
>>> OZAPRS mailing list
>>> OZAPRS at aprs.net.au
>>> http://lists.aprs.net.au/mailman/listinfo/ozaprs
>>
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