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Ch6-UHF
Kensington : 439-275 (-7.6 Mhz) 31\12\2009
Finally got to place the CH6
repeater back at Kensington site .
This repeater will cover in and
around the new Mosis Mabida
Soccer stadium in Durban central.
Please update the CTCSS tone to
88,5 hz encode/decode.
The pic
controller is the great
VK5DJ Pic controller which I have
modified for my own workings, included are COS indicators and a dual
alarm indication .
Thanks must go to John Drew , VK5DJ who has done
a great service to all those using his code.
Here is the early stages of the micro Controller
made on vero board and lacing twine .
Saber Battery repack /modification: Dec-2009
I decided to try something
different when I repacked a few of my saber
battery packs .
I added a small charging housing
from an old ICOM type battery pack and this is the result
.
This allows the use of the
charger as well as a wall charger or cigarette charger as used for Icom radios .
Now the radio can trickle and get
topped up wherever I go and one does not need to lug the big charger around .
See my new Cammo
antenna at the bottom of this page.
General information
I
have moved residence so my new radio room is a 6 m x 3.6m wood
constructed shack with a 1m balcony .So far the work has been slow and no
external antennas in the sky .
Radio Shack during construction
My
son MAC doing quality inspection.
Much is happening with perp work in order to have AC power supply to my
radio room.
Electrical supply DB Board
Trench has AC supply plus
ribbed conjugate carrying 4 RF feeders plus a LAN cable(for
ATU use )
My current setup :I have
been busy with the recent swap out for the Alverstone Repeater 145-600 Mhz
to link Durban 24/7 with Pmb .The MSR-2000 is
100W continuous and it should provide good coverage from Alverstone High-Site.
 _
UHF:Recently I have added a
UHF PA to the Kloof Hub repeater .It is running at 65 Watts and reports
have tended towards a great improvement on the old 3 Watts 
So
far there has been lots of work getting the radio room in order and there
is no better time than when it is new –get it done properly the
first time .
I
have been involved in the radio / telecommunications field since leaving school .My work has
taken me across many diverse radio systems
and specialties .These include Microwave short /long haul (analogue and
digital Base Bands.) , PCM systems ,analogue paging systems , two-way radio
conventional / repeater systems, MPT 1327/1343 analogue trunked systems and much more.
I currently work
for a GSM company in the technical operational side of the 2G/3G network.
My Earthing Project:
Some pictures of my earthing project .
Above:Trench with 4RF cables
in black conjugate and power in blue conjugate , 25mm earthing
cable abd danger tape.
  
Internal gland plate for rf
cables leading to trench.
15_12_2008 :
Completed next stage –bonded earth spikes together
and route finished-25mm bonded to Single earth Point .
 
Notice I used double connectors on both spikes.
Photos to follow will be the cable entry from the
floor through a bent Conjuate pipe onto the
vertical cable try and onto the earth bar.
18
December 2008
For the antenna GURU’s
I am indecisive to what wire antenna would best perform with these high
trees and be wide band .
  
Boxing Day (26/12/2008) :
Run earthing (dual 16mm2)feeds from dB junction bus earthing bar to junction box containing 25mm2 earth
feed from radio shack.
Heres the
results so far :
Below dual earthing preparation .
 
  The
junction has two line-taps-I have not greased them due to the box being
water –tight and I have added a good coat of grease to the seals.
 ============
End result of external junction:RF
and earthing to the left and power to the right
of the gutter downpipe.
 Here is the beginning of the bus bar I
put together on high voltage insulators for above the dB board.
 End result .(I did not screw the wooden
base to the rafters so I used cable ties instead .This way it could be
mounted horizontal if I decide to change it for what-ever reason .)
Completed my dB :
Repeaters: Recent
upgrade to the HUB repeater of the UHF star NATURN network has been
completed and live .
The upgrade consisted of Tait series I repeater and
a midlands 60Watt PA .
So far the audio has been changed to include the
compressor .Reports on the changes have been positive .
  The test bay at the site
.
Upgrade to the ch3 is on the cards .I am in need of one sd1433 (10 Watt
driver ) for the UHF tx to get the ch3 up and
running .
CROSS-BAND : April 2009:
Full crossband home
repeater: Had to go this route as it was the only way in order to have
control as compared to the single CROSS-BAND.
This is in the rafters with its UHF antenna and VHF
antenna totally sepertae and independent from
the radio shack and my inside HF station.
Radio shack antenna : May 2009
Required
an antenna for my radio shack and decided to camouflage the mast and
antenna as much as possible in order to fit in with the surrounding
foliage.
(1)
Cemented
a 100mm steel 3 m pole ito the ground.(700mm
deep)
(2)
Painted
the cammo onto the 7m Fibre glass tapered pole .
(3)
Painted
the cammo onto the Diamond dual band .
(4)
Ran
two low loss feeders from Shack gland plate through centre of tapered mast .
(5)
The
second feeder is for the future HF dipole for the shack.
The
results have been a success with the mast not being that obvious .
Without
the cammo it would have been a dominant feature ,but
the project has been a success.
Below see the cammo
Diamond:
 
Below close up of base of tapered fibre glass pole.
  
In the future I will possibly repaint the pole
–BROWN in line with the colour of the wooden shack.
I have not painted the brackets as of yet .
May 2009:
Completed feeder run from cammo mast to
RF-Gland plate , then feeder run from Gland Plate
to workbench .The cable ties are not all cut yet .
  
 
So far I have accessed PMB 14-700 repeater as well
as the 145-750 repeater – swr meter
indicates Antenna is good .Local repeaters – no problem
.
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