The now-defunct Southern Pacific Railroad, acquired by Union Pacific 20
or so years ago, used DDRR VHF antennas on their trackside signaling
equipment. They were cast steel [maybe brass under the finish], very
low profile on top of the equipment box, small [they looked like a
handle], and about as indestructible as the steel box they were on.
Indestructability is fairly important with stuff trackside in the middle
of nowhere. With antennas however, electrical size matters. Rear
window size at VHF is big ... not so much on 40 meters.
So, does my 41.4 meter wire at 1.8 meters AGL classify as a DDRR?
73,
Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County
On 8/20/2017 6:52 PM, Ken G Kopp wrote:
Larsen makes a VHF mobile antenna that mounts on a vehicle window and is
fed via a capacity coupling arrangement mounted on the inside of the glass.
Some of you have been talking about an antenna that's known as a DDRR and
perhaps not realizing it.
Google is your friend ....
73
Ken - K0PP
On Aug 20, 2017 19:27, <[email protected]> wrote:
Subject: Re: [Elecraft] Mobile antenna breakthrough?
someone makes a rear window antenna ,,,, held with sticky pads to the
inside
of the glass,, worked well on 144
Bob K3DJC
On Sun, 20 Aug 2017 17:15:20 -0700 Phil Kane <[email protected]> writes:
On 8/19/2017 9:26 PM, Doug Smith wrote:
Yes, I was thinking along the same lines ? that copper
?conductive tape? stuff.
It could be mounted to the outside of the carrier and would look
like stylish racing stripes!
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[email protected]
This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to [email protected]
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[email protected]
This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to [email protected]
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[email protected]
This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to [email protected]
