Topband: New 160M high performance receiving antenna at W3LPL

[Rudy Bakalov]

Hi Tim,

This does look like a viable option. Too bad it is single-band and only bi-directional, although a star-like arrangement (with lots of relays) could work too.


Rudy N2WQ


________________________________
 From: Tim Duffy <k3lr at k3lr.com>
To: 'Rudy Bakalov' <r_bakalov at yahoo.com>; topband at contesting.com 
Sent: Wednesday, February 13, 2013 1:43 AM
Subject: Re: Topband: New 160M high performance receiving antenna at W3LPL
 
Hello Rudy,

I am using a pair of VE3DO loops in a phased array for 160 meters. The two
loops are spaced 5/8 wavelength (at 1830 KHz) apart at K3LR - aimed at
45/225 degrees (a DPDT relay selects the direction for each loop).

The VE3DO loops are simple to construct and work very well. The in phase
feed for the two loops is simple with equal lengths of 50 ohm coax to a T
connector and a 25 to 50 ohm UNUN to match to the 50 ohm RX. The VSWR of the
system is excellent with the 9:1 K9AY transformers at each loop feed point
up thru 7 MHz. I suggest using a DX Engineering RPA-1 preamp operating at 16
VDC to feed the receiver for best results. 

Details for the inexpensive VE3DO loop receive antenna is here:

http://topbanddinner.com/page_presentations.html

73!
Tim K3LR 

-----Original Message-----
From: Topband [mailto:topband-bounces at contesting.com] On Behalf Of Rudy
Bakalov
Sent: Tuesday, February 12, 2013 12:00 PM
To: topband at contesting.com
Subject: Re: Topband: New 160M high performance receiving antenna at W3LPL

I have been wondering if the antenna element in phased arrays could be a
loop rather than a vertical. My thinking is that the loop has some level of
directivity so phasing two of them should result in better side lobe
suppression compared to a vertical. Is there any merit to this thought?
Specifically, will I see better RDF numbers if I were to use loop elements
in any of the active 8 and 4 circle systems (e.g., DX Engineering, Hi-Z
Antennas, etc.)?

Rudy N2WQ
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Topband Reflector

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Topband Reflector