If memory serves me correctly, there is a PolyPhaser product that will allow
DC voltages to be applied to the coax (and protect
the DC source or sink as well). That would seem more appropriate and allow you
to continue using your Heathkit switch.
-- Eric K3NA
-----Original Message-----
From: owner-towertalk@contesting.com
[mailto:owner-towertalk@contesting.com]On Behalf Of Tom Rauch
Sent: 2002 January 13 Sun 06:08
To: towertalk@contesting.com; Bill Otten
Subject: Re: [TowerTalk] Remote antenna switches
Hi Bill,
> I've recently begun installing the PolyPhaser flange mount coax
> blocking protectors (IS-B50HU-C0 ~ Broadband dc Blocked Protector for
> Freq. Range: 1.5-400MHz, and IS-B50LU-C1-ME ~ Broadband dc Blocked
> Protector for Freq. Range: 50-700MHz ).
>
> The installation has negated the use of my HeathKit remote coax
> switch, since it uses a DC switching scheme at the tower via the coax.
Why use a DC blocked protector? The DC blocking will do next to
nothing for lightning protection if it passes HF signals without a
SWR bump. Lightning is a time-varying pulse, not DC. The DC
energy content is actually not very high in lightning.
> I'd still like to use some method of remote antenna switching....can
> anyone inform me of another unit that doesn't rely on the above DC
> switching scheme through the coax and offer some thoughts on the unit
> reliability?
Then try an Ameritron RCS-8, but remember you have to suitably
protect or better yet disconnect the cables if you want real lightning
protection.
73, Tom W8JI
W8JI@contesting.com
________________________________________________________________________
Where do you get ICE bandpass filters & beverage matching boxes? The
same place that pays for the hosting of this list: The eHam Store.
Order online at http://store.eham.net.
-----------------------------------------------------------------------
-----
FAQ on WWW: http://www.contesting.com/FAQ/towertalk
Submissions: towertalk@contesting.com
Administrative requests: towertalk-REQUEST@contesting.com
Problems: owner-towertalk@contesting.com
________________________________________________________________________
Where do you get ICE bandpass filters & beverage matching boxes? The
same place that pays for the hosting of this list: The eHam Store.
Order online at http://store.eham.net.
-----------------------------------------------------------------------
-----
FAQ on WWW: http://www.contesting.com/FAQ/towertalk
Submissions: towertalk@contesting.com
Administrative requests: towertalk-REQUEST@contesting.com
Problems: owner-towertalk@contesting.com
|