TV aerial in loft stopped picking up from Winter Hill
some years ago due to path being obstructed by trees at
front.
I'm in an old Victorian house that's a lot higher than a
modern one. Trees at front and rear partially block the
signal path (although gps works through them to some
extent during winter months), at rear the trees are maybe
5m higher than roof and next year there might be another
3-5m growth. Cable run out up wall then back in and to
ridge would at a guess be over 20m. I think a mast on
rear wall will give widest view of sky for longest period
and I now have mast and brackets etc, but not yet
assembled suitable MSF/DCF receivers or interfaces.
I doubt PPS will carry well down coax without suitable
drivers and as I need power to units I'm intending using
rs422 and twisted pair cables.
[]
David
David,
Thanks for your comments. I didn't expect the wireless solution to offer
the best performance, so we can probably rule it out for your needs.
You won't need a separate co-ax for he PPS line - 1-microsecond rise time
will be more than good enough and easy to achieve with just a four-way
screen twisted pair cable. As you will be rarely sending data to the GPS,
I would pair the PPS and +5V lines, and the RX & TX lines. Yes, use
line-drivers receivers and properly terminated cables for best results.
Alternatively four-way screened cable. And I'm thinking GPS, not MSF/DCF.
We used to get baud rates well in excess of 9600 over several hundred
metres in an industrial environment with four-way screened twisted
pair....
Cheers,
David
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