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Reply to "Great Northern railway"

Block signalling on the GNRW  phase III:

Although Phase II (software) is not completely done, Phase III (hardware) of installing all coil sensors to the Tower LCC's has proceeded.   With the previous initial test of several blocks, 10 more blocks with sensor coils to the Tower LCC's were completed.

The circuit boards were moved to a permanent location.

signals RR-cirkits CB 05

Unlike 40 years ago, I'm a little smarter now (but not much) and labeled both ends of the sensor coil wires.

signals RR-cirkits CB 06  

The variable 'pots' needed adjustment and, per the builder of these circuit boards, some 0.1 UF capacitors were needed across the sensor coil wires.  

One thing I did that I learned back when constructing the layout, only one wire hook up at a time and thoroughly test it before adding more wires.

Besides an engine, I'm using one of the low amp draw lighted cabeese to test the 'system'.  This will keep the block signal as occupied until the entire train has left the block.  The LED's in the cabeese only draws .004 amps so this system is pretty sensitive to low voltage.  NOW, I'm glad I lighted all those cabeese

 

signals RR-cirkits CB 07

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  • signals RR-cirkits CB 05
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  • signals RR-cirkits CB 07
Last edited by samparfitt
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