[Hi-zreceivingarraydiscussions] DIRECTIVITIY 8 CIRCLE

[Lee K7TJR]

This will be an interesting thread. The Hi-Z 8A was only designed to work on a single band, but to produce the best SNR currently available on that band. I suspect your observations are what I would expect on other bands. If operating on multiple bands, I would suggest changing over to a 4-8Pro which is a 3 band array and shows reasonable directivity on all three. With of course, slightly less available SNR of received signals than the single band array.
   All that being said, I have heard that the 8A actually hears reasonably well on 80 Meters while not showing much directivity.
 I personally have not seen the need for common mode protection however every install is usually different. If you are seeing 30+ dB of front to back ratio on 160 meters I suspect your ground rods are quite adequate.

What say others?

Lee  K7TJR

-----Original Message-----
From: Hi-zreceivingarraydiscussions [mailto:hi-zreceivingarraydiscussions-bounces at hizantennas.com] On Behalf Of k4pi at bellsouth.net
Sent: Saturday, November 30, 2013 2:13 PM
To: hi-zreceivingarraydiscussions at hizantennas.com
Subject: [Hi-zreceivingarraydiscussions] DIRECTIVITIY 8 CIRCLE

I have an 8 circle in 200 ft diameter.  I notice the F/B and F/S are mainly only good on 160.  Even on the upper portion of the BC band for the most part the F/B is not great.  Not that I need this but I have used Hi Z 4 squares with 90 ft on a side and they seem to have good F/B on the BC band and other bands.  On 80 with the 8 circle I can tell the most predominant direction of a station but there is little F/B and F/S.  Just wondering if this is what others are seeing.  It receives fine.  

I am well pleased with the system but just wondered what others were seeing.  I am using only a single 4 ft ground rod and wondered if anyone else had seen any improvement of the system with more ground rods.  Also wondered if anyone else was using common mode chokes in the feed line as recommended by ON4UN’s Low Band DXing book.  I have one at the receiver end built from K9YC data.  My feedline is about 450 ft long being cable TV hardline.  It is grounded once in the middle.

Would like to hear from others on their experience.  

73 Mike K4PI
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