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

Mon Jan 2 16:21:30 EST 2006

Good response! Colin. I never took the exam for lower case! JJ

col wrote:

> 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
>>>>>>
>>>>>> This email is for the sole use of the intended recipient(s) and may
>>>>>> contain confidential
>>>>>> and privileged information. You should not disclose its contents 
>>>>>> to any
>>>>>> other person. Any
>>>>>> unauthorised review, use, disclosure or distribution is 
>>>>>> prohibited. If
>>>>>> you are not the
>>>>>> intended recipient, please notify the sender immediately.
>>>>>> _______________________________________________
>>>>>> UK-Contest mailing list
>>>>>> UK-Contest at contesting.com
>>>>>> http://lists.contesting.com/mailman/listinfo/uk-contest
>>>>>>
>>>>>>
>>>>>>
>>>>>> -- 
>>>>>> No virus found in this incoming message.
>>>>>> Checked by AVG Free Edition.
>>>>>> Version: 7.1.371 / Virus Database: 267.14.10/218 - Release Date:
>>>>>> 02/01/2006
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>> _______________________________________________
>>>>> UK-Contest mailing list
>>>>> UK-Contest at contesting.com
>>>>> http://lists.contesting.com/mailman/listinfo/uk-contest
>>>>>
>>>>>
>>>>>
>>>>>
>>>>
>>>> -- 
>>>> No virus found in this incoming message.
>>>> Checked by AVG Free Edition.
>>>> Version: 7.1.371 / Virus Database: 267.14.10/218 - Release Date:
>>>> 02/01/2006
>>>>
>>>>
>>>>
>>>>
>>>
>>> _______________________________________________
>>> UK-Contest mailing list
>>> UK-Contest at contesting.com
>>> http://lists.contesting.com/mailman/listinfo/uk-contest
>>>
>>>
>>>
>> _______________________________________________
>> UK-Contest mailing list
>> UK-Contest at contesting.com
>> http://lists.contesting.com/mailman/listinfo/uk-contest
>>
>>
>>
>> -- 
>> No virus found in this incoming message.
>> Checked by AVG Free Edition.
>> Version: 7.1.371 / Virus Database: 267.14.10/218 - Release Date: 
>> 02/01/2006
>>
>>
>
>