[UK-CONTEST] Whatanuk-contest@contesting.com <uk-contest@contesting.com>tenna for AFS?

Mon Jan 2 16:02:09 EST 2006

looks like you must be very bored tonight!
regards colin
----- Original Message ----- 
From: "G3SJJ" <g3sjj at btinternet.com>
Cc: <uk-contest at contesting.com>
Sent: Monday, January 02, 2006 8:46 PM
Subject: Re: [UK-CONTEST] Whatanuk-contest at contesting.com 
<uk-contest at contesting.com>tenna for AFS?


> eH? soRry, my addled brain cant  r'ead this. wHats aNuk.  iVe' gota
> feelin you're spIlling chOcker as ad to much too dri'nk
> de H11
>
>
> col wrote:
>
>> i vaguely remember a couple of years ago clive gm3poi did an analysis of
>>AFS test propagation from GM and suggested that we would need a 3 el yagi 
>>@
>>180' to be competitive from up here!
>>
>>We thought the wire reflector did help, but that is subjective. i have
>>looked at wire yagis but dont think we can get them up high enough to make
>>them worth the effort. i do like the look of the 80m moxon cebik describes
>>might be worth a try if you have a small garden.
>>
>> One of the best all round antennas we have used from GM6NX on 80m was a
>>full size quad loop fed 1/3 wavelength up one side chapter 10-6 on4un
>>lowband dxing
>>
>>i think geoff has got it right with a inverted L easy to make with a 
>>fishing
>>pole for vert section and feed with a 2:1 unun, couple of elevated 
>>radials,
>>works every time takes minutes to put up.
>>
>>Talking of wide band noise I wish I could cure my s9+++ constant noise at
>>this QTH from 1.8-30mhz noise dies down a bit above 21 mhz to s5. Have 
>>tried
>>to locate but to no avail its not in my house or immediate neihbours 
>>turned
>>all electricity off to test.
>>
>>it has a spike every 50-100 khz wibeband i suspect its a switch mode power
>>supply. The noise never dissapears 24/7, vhf frequencies clear.
>>
>>Is it worth asking ofcom to have a look as it does interfere with am
>>reception?
>>
>>
>>regards Colin
>>
>>
>>----- Original Message ----- 
>>From: "G3SJJ" <g3sjj at btinternet.com>
>>To: "col" <col at v21mail.co.uk>
>>Cc: <uk-contest at contesting.com>
>>Sent: Monday, January 02, 2006 6:24 PM
>>Subject: Re: [UK-CONTEST] What antenna for AFS?
>>
>>
>>
>>
>>>Be interesting to know if you actually noticed the 0.1dB gain!! 
>>>Seriously
>>>though, might be worth trying to calculate what take off angle is 
>>>required
>>>to put maximum signal into say Berkshire from a location in central
>>>Scotland and then designing the 2 el array spacing for that.
>>>
>>>What I find interesting about that article, which John LZQ sent me a
>>>couple of years ago, is that for "good" ground my antenna at 55ft is very
>>>close to the optimum height for max NVIS gain, and for "very good" ground
>>>it is a few feet too high. I would class the heavy clay soil around here
>>>as "Good to Very Good." My AFS/80m Cums results over the last few years
>>>appear to verify this.
>>>
>>>We came to the conclusion that a parasitic reflector would not have any
>>>major effect, although I am tempted to try a 140ft wire apex about 15ft,
>>>sloping to about 5ft to mimic the slope characteristic of the driven
>>>element.
>>>
>>>Interestingly I notice on 160m that the dipole (which is the 80m dipole
>>>with 60ft extensions on each leg, jumper dissed for 80m) always performs
>>>similar to dipoles 15 to 20 higher at other locations. Again I have put
>>>this down to local ground conductivity and that it is uninterrupted for
>>>many wave lengths.
>>>
>>>Chris G3SJJ
>>>
>>>
>>>col wrote:
>>>
>>>
>>>
>>>>Hi Stewart HNY
>>>>
>>>>have a look at w4rnl's site lots of info on NVIS antennas for 80m
>>>>http://www.cebik.com/wire/cb.html
>>>>
>>>>John mm0ccc and I used the 2 el wire yagi firing straight up approach at
>>>>gm6nx
>>>>
>>>>Colin GM0RLZ
>>>>----- Original Message ----- 
>>>>From: "Cooper, Stewart" <coopers at odl.co.uk>
>>>>To: <uk-contest at contesting.com>
>>>>Sent: Monday, January 02, 2006 3:31 PM
>>>>Subject: [UK-CONTEST] What antenna for AFS?
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>>HNY contesters! AFS is only a few days away, and I wondered what 
>>>>>antenna
>>>>>would be best? I have a vertical and a delta loop. Perhaps I ought to 
>>>>>put
>>>>>up a dipole? Last year my crappy old dipole seemed to perform the best 
>>>>>as
>>>>>I recall.
>>>>>
>>>>>Stewart
>>>>>GM4AFF
>>>>>
>>>>>P.S. Perhaps the dipole ought to be in Oxfordshire, but that's another
>>>>>matter.
>>>>>
>>>>>
>>>>>
>>>>>----------------------------------------------------------------
>>>>>
>>>>>Offshore Design Ltd
>>>>>
>>>>>www.odl.co.uk
>>>>>
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>>>>>
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>>>>
>>>>
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