[hpsdr] Fwd: Hermes Ethernet

[Richard]

On Thu, 05 Aug 2010 15:43:07 +0200
Henry Vredegoor <henry.vredegoor at gmail.com> wrote:

> ***** High Performance Software Defined Radio Discussion List *****
> 
> Hi Bob, All,
> 
> I am experiencing the same and I must admit that it is all cheap 
> hardware and cabling that I'm currently using and no special attention 
> was given to the routing layout etc. because it is all for temporary use.
> 
> But I think to minimize interference the same old rules apply like for 
> any data cabling scheme:
> 
> Use of good quality  cables and connecting hardware
> Use of good quality network gear, preferably in metal enclosures / cabinets
> Good earthing scheme
> Good routing schemes for cabling, (metal shielding cable ducts?) away 
> from antenna (receiving-) cabling
> Good power cabling
> 
>   I think if you search the net you will find good information on the 
> subject.
> But it also can be hard to fix/find an interference problem introduced 
> by "wrong" wiring.
> 
> 73's,
> 
> Henry.
> 
>

Hi
the situation is worse when the ISP is using fibeoptic cable then converts to
UHF for local distribution, so you end up with crud from LF right up to about
600MHz, there's no excuse for it, if balance cables are properly terminated,
there is not too much radiation.
I consider in 4 pair cables the unused pairs should be terminated too. but that
cost too much to do, according to the ISPs.

my two penneth
-- 
Best wishes

Richard Bown G8JVM

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