jurdyr - 05 June 2009 02:31 AM
can you take more photos please show the cables and all the bostter units and send two me please , want to make it out better
jurdy
(Replied as follows)
As requested, here are some hi-res pictures of the setup, from which you should be able to see
more.
The modules *are* mounted on a frame, except the bottom fixing of the 905-S (marked channel 39).
The coax in, to the 905-S, has an injector for 12v from the power supply, which I guess goes up to
power a masthead amplifier. The power supply is fed from a 230v socket, which in turn is fed from a
fusebox in the room.
The coax chain then goes to the 6 905-Gs (marked channels 42, 45, 59, 62, 65) and the three Teko
MP13s (marked channels 56, 57 and 57), for which the 12v power is jury-rigged via the white cable.
The outputs are likewise chained together, from the 905-S onwards to the last MP13 (it’s a trick of
the photo that it looks as if the final coax cable comes off the earlier one, but it doesn’t).
This coax then goes to the Alcad DE-219 distribution box, which *is* fixed directly on the wall (but I
doubt if it sees any DC so perhaps it’s just sloppy rather than dangerous?), 1 in, 3 out.
And the three outs go back into the wall, down three conduits. One of these conduits is the one
from which the coax from the roof comes; also in there is a CAT-5 network cable, which goes into
another hole, on the left, where the telephone wires are a mess I don’t even want to think about (and
fortunately don’t have to).
The FM module just sits there on the rack, powered but not connected.
I reckon all the 905-Gs date from 1992 when the building went up, and the 905-S is a later
replacement for a channel 39 905-G module that failed, perhaps.
The Tekos look like a later addition; were channels 56 and 57 not used in 1992? And why 2 channel
57 modules anyway?
Or are these perhaps for TDT?
Also attached is a better picture of the aerials; that bottom one still looks like an FM dipole to me,
rather than a broken aerial for something else…
The line of the building faces NNE/SSW, so the aerials are probably pointing SWS (top two) and SE
(bottom 2, though the dipole is facing 90 degrees to that..
I bet the top aerial was added later than 1992, though. Is it a ‘digital’ aerial? Is there indeed such a
thing as a ‘digital’ aerial rather than just a ‘better’ aerial?
And re the 905-Gs; do these need replacing by ‘digital’ amplifiers, or just supplementing?
And again, is there such a thing as a ‘digital’ module, rather than just a ‘better’ module, to decode
what, despite being TDT, still arrives (if I understand it correctly) as a multiplexed signal on an
existing channel?
