Hi Mario, How have you been? It's been a long time! Are you still with GTZ?
Adding a phasing harness into the system will automatically drop you down 3db
from where you were with one antenna. My advise is to dump the yagi, or replace
both antennas with a folded dipole style phased array, where you could "steer"
the pattern in a particular direction with 2 or more of the dipoles.
In my opinion, that would be the best way to accomplish what you want to do.
But unfortunately, these antennas come at a typically higher price than a
standard fiberglass style antenna.
Look at my site for different base antennas, there are many types there.
73,
Scott
KA1CLX
At 01:52 PM 1/22/99 +0300, you wrote:
>
>Dear OM?s
>
>Greetings from Uganda!
>
>Who can help?
>I want to put up a VHF repeater for the UARS, Uganda Amateur Radio Society
>here in Kampala, with a 6dB omnidirectional collinear antenna, together with
>a 6-el.-Yagi antenna for a ?Keyhole antenna pattern?!
>The Collinear antenna is mounted on the top of mast, and the Yagi, (at
>present 1 lambda ) below.
>
>Who knows the correct vertical spacing for that kind of setup!
>I can?t find anything in the ARRL antenna book.
>I?m using a Procom Harness / or combiner cable, and exact 3m coaxial cable
>between the two antennas, for correct phasing.
>But the system seems not to work properly.
>Poor signal in 30-km distance, in the direction of the Yagi, as well in the
>back, where the omnidirectional should do the job!
>
>Any help is highly appreciated!
>
>N.B. I?m working here for a communication company, as the Technical Manager,
>and I?m looking as well for good quality, commercial mobile HF antennas
>(fiberglass). Any ideas? Outbacker, or Comet, do they manufacture commercial
>antennas?
>
>Vy 73?s 55
>
>De 5X1C, Mario Berger
<bold><bigger>
Advantage Communications
</bigger></bold>Professional Wireless Communications
www.advantagecomm.net
978-568-1944
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