[Hi-zreceivingarraydiscussions] Detuning antennas when using 4 sq

[Roger D Johnson]

Hi Doug....

Sorry I got off track when I thought you said inverted V. Describe your inverted L.
Vertical height, horizontal length, any matching circuit at base, any traps, etc.

73, Roger

On 9/20/2012 3:43 PM, Doug Turnbull wrote:
> Gentlemen,
>       I am using a good balun on the feed line of the TB Inverted L to
> decouple it.   Gary, who manufactures the vacuum relay and where are they
> available?   I understand that you are suggesting to break the sky hook
> close to the point where it connects to the transmit antenna the radial
> system being left in place.    I am presently using raised radials and so
> these may complicate the issue.    I wonder if ground mounted radials would
> be as problematic as I am likely to make the change to an extensive ground
> radial system.   Thank you for advice already given and any more information
> you may have.
>
>              73 Doug EI2CN
>
>
>
>
> ----------------------------------------------------------------------
> ,
>
>         I am using a Hi-Z four square and find that then my 160M inverted L
> is down that it works better on both TB and 80M.   Obviously there is an
> interaction and yes it is certainly closer than two hundred feet to the
> closest point of the 4 sq.    What method of detuning antennas such as the
> inverted L is normally used?    I suppose a relay switching in or out is
> part of the system and the problem then becomes that when operating on TB
> the TX antenna must be detuned possibly slowing down operations and if not
> properly thought out problematic for a power amplifier.
>
>   
>
>
>                                       73 Doug EI2CN
>
>
>
> ------------------------------
> 	
> Content-Type: text/plain;	charset="us-ascii"
>
> Doug, I would use an RJ-1A vacuum relay to open (disconnect) the antenna
> from the feedline...if no current can flow in the antenna wire it should not
> re-radiate and bother the 4 square...de gary
>
> -----Original Message-----
> From: hi-zreceivingarraydiscussions-bounces at hizantennas.com
> [mailto:hi-zreceivingarraydiscussions-bounces at hizantennas.com] On Behalf Of
> Doug Turnbull
> Sent: Wednesday, September 19, 2012 3:15 PM
> To: hi-zreceivingarraydiscussions at hizantennas.com
> Subject: [Hi-zreceivingarraydiscussions] Detuning antennas when using
> 4square
>
>
>
>
>
> ------------------------------
>
> Message: 3
> Date: Wed, 19 Sep 2012 15:58:44 -0400
> From: Roger D Johnson <n1rj at roadrunner.com>
> To: Hi-Z Receiving Array Discussions
> 	<hi-zreceivingarraydiscussions at hizantennas.com>
> Subject: Re: [Hi-zreceivingarraydiscussions] Detuning antennas when
> 	using 4square
> Message-ID: <505A23F4.6080105 at roadrunner.com>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> It's a bit more complicated then that. If you open the feedline center
> conductor
> at the antenna (Ithink that's what you mean), you still have two half waves
> on 80m.
> Also, you have the combined length of half the inv V and the outer conductor
> of the
> feedline that's resonant somewhere! Doug..do you have a good balun to
> prevent
> this?
>
> 73, Roger
>
>
>
>
>
>
>
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