[Hi-zreceivingarraydiscussions] DIRECTIVITIY 8 CIRCLE

[rich_k7zv at gphilltop.com]

A few comments on my experience with the HI-Z 4-8 Pro. It works really
well on 160 and 80. I have a 3 element yagi for 80M on a 130 foot tower
located on a hilltop with major drop off all around. I was impressed that
the HI-Z RX was on par with the yagi! The 160 RX is excellent and has
prompted me to improve my TX  antenna which is happening right now.
Hopefully that will help me work what I am hearing and can't work.

What I find interesting is the RX on the higher bands using the 4-8 Pro.
My HF antennas are at 100 feet on a different tower than the 80 and also
has extreme drop off in all directions. There are many times the HI-Z has
improved my RX on those bands. My feelings on this the HI-Z is hearing the
higher incoming angle signals better then the yagi's low angle lobe. In
any case I find myself using it to my advantage even as high as 17M.

Thanks to HI-Z and their fine product!

Rich K7ZV


> My HI-Z 4-8 PRO wrks great on both 80 & 160 with good F/B ratio. I am
> extremely pleased with the results. In fact it generally hears better on
> 80 than does my M2 rotary at 100 ft.
>
> 73,
>
> John, W4NU
>
> On 11/30/2013 5:56 PM, Lee K7TJR wrote:
>> 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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>
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