[Hi-zreceivingarraydiscussions] Detuning antennas when using 4square

[Roger D Johnson]

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


73, Roger

On 9/19/2012 3:30 PM, kd9sv wrote:
> 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
>
> Gentlemen and Yls,
>
>         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.
>
>   
>
>         I am most pleased that Hi-Z is again actively trading.    The product
> is good and the service of equal value.   Long may this company be with us.
>
>   
>
>                                       73 Doug EI2CN
>
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