[Premium-Rx] Broad Bandwidth HF RX Antenna

[Carcia, Frank A. HS]

So if one was to construct a 80 and 40 meter dipole or inverted v
or a 160 / 80 system hams could get double duty. 2:1 ratio was the part
I didn't know about. TNX for the cool info.  fc

-----Original Message-----
From: Al Klase [mailto:skywaves at webex.net]
Sent: Monday, January 26, 2004 1:12 PM
To: Carcia, Frank A. HS
Cc: Mark Donaldson; premium-rx at ml.skirrow.org
Subject: Re: [Premium-Rx] Broad Bandwidth HF RX Antenna


Hi Frank,

That should work just fine.  There was a military double 
doublet that was used for tranmission as well as reception. 
  The VSWR is never worse that maybe 4 or 5 to 1.  If I 
recall properly, they "crossed over" the connections to the 
two dipoles at the feed point.

Low-loss balanced feed line is the key.

There are modern NVIS (Near-Verticle Incidence Skywave) 
antennas designed for regional HF coverage that consist of 
two  low inverted-V's (same 2:1 ratio) at right angles feed 
by a low-loss feedline.

Al



Carcia, Frank A. HS wrote:

> Al,
> What if 2 dipoles were connected to an open wire line say 450 ohms to the
> shack,
> with a bb transformer in the shack. This way the antenna could also be
used
> for transmitting also. I wonder if you still get the same effect? The BB
> transformer would just be replaced with an antenna tuner when you want to
> transmit. I will have the same problem on my beach lot.   fc  

-- 
Al Klase - N3FRQ
skywaves at webex.net
Flemington, NJ 08822
Web Page:  http://www.webex.net/~skywaves/home.htm