The higher you can get the bottom wire off the ground, the better the
antenna will perform. It should be at least 3 meters off the ground,
preferably higher. 73, Dick WC1M
> -----Original Message-----
> From: Geert Hofman [mailto:Geert_Hofman@Jabil.com]
> Sent: Monday, October 30, 2006 5:37 AM
> To: towertalk@contesting.com
> Subject: [TowerTalk] 80 m delta loop
>
> Hi,
>
>
>
> Some weeks ago I posted a question regarding my 80 m delta loop .
>
> I finally decided to go the "easy way" and cut off about 10
> meters, to get it to resonance in the 80 m band
>
> It's now resonant around 3.650 Mhz and by replacing the
> "tuning bit of wire" I can get it up or down.
>
>
>
> Made this morning my first QSO with K1 land, so I am
> happy.... ( although I only got 449, whilst I read him with
> real 559, but am running only 100 Watts)
>
>
>
> Out of curiosity though I modeled the antenna via MMANA but
> get very strange results...
>
> I assume there are more knowledgeable people on this group,
> who can tell me what really to expect.
>
>
>
> I made a small drawing below ...
>
>
>
>
>
> *
>
> 21 meter * * 21 meter
>
> * *
>
> * *
>
> *
> *° FEEDPOINT
>
> * * * * * * * * * * * * * * * *
>
>
>
> 42 meter
>
>
>
> Apex height is only 10 meter and baseline wire of 42 meter is
> only 2 meter from the ground.
>
> Feedpoint is very close to the corner , but was measured for
> around 3.600 MHz, so pretty much in line with current
> resonance of 3.650 MHz
>
>
>
> Soil is average to good.
>
>
>
> Would like to hear what take off angle with max gain I can
> expect and some idea of the radiation pattern.
>
>
>
>
>
> Thanks for helping me out and hopefully we meet somewhere on
> 80 ( CW or BPSK )
>
>
>
>
>
> 73's - ON4IG - OQ5A
>
> Gerry
>
>
>
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