Thanks Clive! I did a F/B test towards the TX ant and the F/B is indeed
5 db less. I may need to think of that solution.
73 Ash 3V8SF
-- Original Message --
From: "Clive GM3POI"
To: "Ashraf Chaabane"
Sent: 02/03/2019 12:32:02
Subject: RE: Re[2]: Topband: 4 Squar
e GM3POI"
To: "Ashraf Chaabane" ; topband@contesting.com
Sent: 02/03/2019 11:54:48
Subject: RE: Topband: 4 Square Receiving at 3V8SF
Ash model in also your TX antenna and see whether you need to isolate
that
vertical on RX with a relay. 73 Clive GM3POI
-Original Message-
From:
: Topband: 4 Square Receiving at 3V8SF
Hi guys,
I built a 4 Square Receiving Array for 160m at 3V8SF. I put details in
my website: http://kf5eyy.info/topband.htm
The achieved F/B so far is 20 db and the F/S is 19 db. There is still
room for improvement with better matching of the elements. I'll
Clive,
The vertical is 130m away from the array center. I'm presuming this is a
good distance to avoid interaction.
73 Ash 3V8SF
-- Original Message --
From: "Clive GM3POI"
To: "Ashraf Chaabane" ; topband@contesting.com
Sent: 02/03/2019 11:54:48
Subje
Hi guys,
I built a 4 Square Receiving Array for 160m at 3V8SF. I put details in
my website: http://kf5eyy.info/topband.htm
The achieved F/B so far is 20 db and the F/S is 19 db. There is still
room for improvement with better matching of the elements. I'll need
time to do that.
Thanks to Ahm
Jim, you need ON4UN's 5th edition of "Low Band Dxing" page 11-93 talks
about the 4 square with 1/8 wave spacing.
He says, regarding the 1/8 wave spacing (67 feet +/-)
- gain is down 1.3 db compared to 1/4 wave spacing.
- directivity is as good or better than 1/4 wave.
- has much narrower bandwit
Manual says min spacing for 160M is 54ft and optimal spacing is 135ft. 135ft
is a non-starter for my lot. Can anyone comment on performance degradation
between these two extremes? Minimal? Substantial? Sensitivity? f/b? I cannot
find experimental data.
Jim K7EG
Sent from Mail for Windows 10
> Even so the odd Dec/Jan thunderstorm can cause a problem so I have a supply
> of 450 ohm resistors of the type recommended on this reflector, on hand for
> quick repairs! The maintenance never ends! Steve, NN4T
Get some gas tubes from Mouser. I use 652-2049-12-BT1LF. 62 cents each last
tim
Subject: Re: Topband: 4 square
The DX Engineering arrays use hi-impedance verticals that need a preamp. The
preamp is especially susceptible to lightning damage and does not matter
whether it is powered on or not.
There are other 4-squares and 8-circles that use passive low-Z elements that
Used both the 4 square and 8 circle array by DX Engineering. Both work
but, in my thunderstorm environment, I spent many hours and as many
dollars as the systems originally cost repairing them over three seasons.
This is despite keeping the systems powered off, except when being used.
The guys
Used both the 4 square and 8 circle array by DX Engineering. Both work but, in
my thunderstorm environment, I spent many hours and as many dollars as the
systems originally cost repairing them over three seasons. This is despite
keeping the systems powered off, except when being used. The guys a
Does anybody have an opinion on the DX Engineering verses the Array
Solutions 4 square controller?
- Paul KW7Y
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