[Antennas] DC voltage on coax

[James Duffer]

A close examination of the drawing reveals that the dc source is blocked 
from the solenoid by the first cap (the cap closest to the radio).  the 
connection from the dc appears to have been moved maybe by the word 
processor or the formatting of the e-mail.  Probably was connect to the left 
of the cap originally.



>From: "William Lambing" <w0lpq9 at msn.com>
>To: <antennas at mailman.qth.net>, "Ray Brown" <raybrown at ipa.net>
>Subject: Re: [Antennas] DC voltage on coax
>Date: Wed, 3 Nov 2004 22:47:23 -0500
>
>Use a series cap to isolate the DC from the radio and antenna.  Then 
>feed/extract the DC with a series 1mh RF Choke that is applied after the 
>cap to the radio.
>
>ANT-----||----------------------||-------radio
>                  |                        |
>                  |                        |
>                RFC                     RFC
>                  |                        |
>                  |                        |
>                Relay                   +Volts
>                 coil
>
>Hope you get the idea.  We did this at Collins years ago on a CATV/FDM 
>Telephone system on RG-59 Coax.
>
>73
>
>Bill, W0LPQ
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