At 01:48 PM 3/15/05, you wrote:
>what do you guys know about the installation of radiating cable for a
>repeater in a building. I have a 5 story building and sub basement. So
>it is like 6 stories. Thinking of putting the repeater in the lower level
>and installing the cable up to the roof. On the roof thinking a
>DB-408. (or would a dummy load be used) This would be a UHF
>repeater possible 2 watts or other low power use. The goal is to cover
>the floors as there are a lot of cement and metal. At this time they have
>a repeater on the roof but the lower floors are dead and there is very
>little receive in the sub basement. The current repeater is 40 watts. No
>preamp.
>
>Or any other thoughts would help.
>
> John
Several office buildings in downtown Los Angeles are
using that exact system, with DC remotes from the
radio cabinet to a telephone set style remote at the
guard desk. The antenna on the roof provides coverage
for a short distance around the building and the Radiax
(that is in one of the elevator shafts) gives saturation
coverage in the building.
If you end up installing Radiax USE THE PROPER
HANGERS... and it's up to you to convince the fire
inspector and the building maintenance folks that it
DOESN'T go in conduit... there's a story behind that...
An alternative method that I saw a hospital in a
air conditioning building on the roof:
A Motorola PURC (900MHZ Micor based) paging
system TX fed a power divider - of a type I had
never seen before - was an aluminum block
the size of a red brick, with three ports, one labeled TX,
the second labeled ANT-1, and the third labeled ANT-2,
with stenciled text on the side...
"BIRD 900MHz power divider
75% to ANT1
25% to ANT2"
The ANT1 feedline fed a super stationmaster on a
10 foot mast on a tripod mount.
ANT2 was a 6 element beam pointed straight
down into the building.
The pagers worked even in the sub-basement
x-ray room.
Mike WA6ILQ
Yahoo! Groups Links
<*> To visit your group on the web, go to:
http://groups.yahoo.com/group/Repeater-Builder/
<*> To unsubscribe from this group, send an email to:
[EMAIL PROTECTED]
<*> Your use of Yahoo! Groups is subject to:
http://docs.yahoo.com/info/terms/
