[160m] Re: 160m Digest, Vol 30, Issue 2

[David Raymond]

If your signaling needs are simple, using DC is the easiest option.  A 100mh
choke will provide adequate RF isolation.  A .01mfd capacitor can be used to
block the DC.  I have used this configuration many times for simple
requirements.  It works well and generates no interference whatsoever as
long as the coax does not have water in it.

73...Dave
W0FLS

-----Original Message-----
From: 160m-bounces at mailman.qth.net
[mailto:160m-bounces at mailman.qth.net]On Behalf Of d.cutter at ntlworld.com
Sent: Tuesday, May 29, 2007 6:49 AM
To: 160m at mailman.qth.net; 160m at mailman.qth.net
Subject: [160m] Re: 160m Digest, Vol 30, Issue 2


I am about to deploy some Beverages and I thought it would be good to use
the coax for signalling as well, but the rf transformers of course present a
little problem.  I thought if I were to use tone signalling (rather than dc
levels), say CTCSS and use an opto-isolator to get around the transformers
that might do the trick.  That's as far as I've got, but it may give someone
an idea.

David
G3UNA


> Does anyone know a good source for control cables? My
> Beverage control cables need replaced. Right now I'm using a
> flooded copper shielded 5 pair telco cable but can't seem to
> lay my hands on any more.
>
> I've priced sprinkler control cables at about $0.45 per foot
> but I was hoping to find surplus to cut the cost since I
> need a few thousand feet. Has to last a while underground
> and be at least 20 ga conductors. Can't use CAT5 cables,
> life is too short. Also need ten conductors or more. 9
> control and a ground return.
>
> 73 Tom
>

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