[OZAPRS] smart meters ?

[Gerard Hill]

How will you match it, Ray? Delta match or T match perhaps?
Maybe its discussed in Wells' article from 1943, but its hard to get 
hold of without an IEEE subscription.

Damien, I'm currently using an end-fed inverted L antenna for 30m APRS. 
Originally it was designed as a 3/8λ for 160m like this one: 
http://www.n8mr.com/topband.html
I've shortened it to about 50m long so that its a 5/4λ on 40m and 7/4λ 
on 30m. At 18m high, the horizontal length (32m) is less than an 80m 
half wave dipole so it might fit your lot. Polarisation is mixed so the 
vertically polarised local mobiles can be received as well as the more 
distant stations via sky wave.

Cheers ... Gerard, VK2IO

On 12/12/2010 8:10 AM, Ray Wells wrote:
> 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!