Topband: : Re: 1 center point to ground all 8 beverages??

[donovanf at starpower.net]

Hi Felipe, 


I've never done Beverage switching in my antenna field, my 
nine receiving antenna feedlines go individually to my shack. 


But I'll speculate a bit, perhaps others can comment based on 
their actual experience. 


The feed point impedance of a Beverage antenna is approximately 
450 ohms. If you use relays to select among the Beverages at 
the 450 ohm impedacne level you probably will have great 
difficulty achieving adequate isolation. 


You're more likely to achieve good switching isolation on the low 
impedance side of your Beverage matching transformers. If you 
must use a common ground rod for multiple Beverage feed points, 
you should also switch the connections to the ground rod. 


73 
Frank 
W3LPL 











----- Original Message -----

From: "Filipe Lopes" <ct1ilt at gmail.com> 
To: "Frank Donovan" <donovanf at starpower.net> 
Cc: "topband" <topband at contesting.com> 
Sent: Sunday, March 27, 2016 9:53:21 PM 
Subject: Re: Topband: : Re: 1 center point to ground all 8 beverages?? 


Hello Frank 
Thank you for your email, just one more question. 
Do you put the relay directly at each antenna wire or do you just connect the ground to a common point and you select and deselect the antenna you want to be connected to ground? 
73s Filipe CT1ILT 
Sent from my Huawei Mate 8 
Em 22/03/2016 4:12 p.m., < donovanf at starpower.net > escreveu: 




Hi Felipe, 


As W4ZV noted in his posting, three meter ground rod spacing was 
not enough when he brought multiple Beverages to a common point. 


A much better solution is to use inexpensive hermetically sealed 
relays to connect only the selected Beverage to a single ground rod. 


73 
Frank 
W3LPL 




From: "Filipe Lopes" < ct1ilt at gmail.com > 
To: "k1fz" < k1fz at myfairpoint.net >, "topband" < topband at contesting.com > 
Sent: Tuesday, March 22, 2016 1:17:51 PM 
Subject: Re: Topband: : Re: 1 center point to ground all 8 beverages?? 

what about 7 ground rods 20cm apart, will it do ? 


73's Filipe Lopes 
CT1ILT - CR6K 
F4VPX - TM3M 

2016-03-22 14:09 GMT+01:00 K1FZ-Bruce < k1fz at myfairpoint.net >: 

> 
> ----- Forwarded message from K1FZ-Bruce ----- 
> 
> Date: Tue, 22 Mar 2016 09:04:06 -0400 
> From: K1FZ-Bruce 
> Reply-To: k1fz at myfairpoint.net 
> Subject: Topband: Fwd: Re: 1 center point to ground all 8 beverages?? 
> To: Topband 
> 
> I agree. We have been thinking of switching at the coax cable location. 
> Will need to correct my Beverage notes page. 
> 
> The W4ZV and W3LPL method will work. 
> 
> 73 
> Bruce-K1FZ 
> 
> www.qsl.net/k1fzbeverage_antenna.html 
> 
> http://www , qsl.net/k1fz/beverage_antenna.html 
> 
> 
> ----- Forwarded message from Bill Tippett ----- 
> 
> Date: Tue, 22 Mar 2016 05:19:48 -0400 
> From: Bill Tippett 
> Reply-To: Bill Tippett 
> Subject: Re: Topband: 1 center point to ground all 8 beverages?? 
> To: topband 
> 
> W3LPL: 
> 
> >Another solution is to use 
> relays to connect only the selected Beverage to the ground rod 
> and disconnect the other seven. 
> 
> I've done this for 31 years from 3 different locations with no problems. 
> From a 2011 post on this subject: 
> 
> _________________ 
> Topband Reflector Archives - http://www.contesting.com/_topband 
> 
> ----- End forwarded message ----- 
> 
> _________________ 
> Topband Reflector Archives - http://www.contesting.com/_topband 
_________________ 
Topband Reflector Archives - http://www.contesting.com/_topband