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" <[email protected]> To: "Frank Donovan" <[email protected]> Cc: "topband" <[email protected]> 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., < [email protected] > 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" < [email protected] > To: "k1fz" < [email protected] >, "topband" < [email protected] > 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 < [email protected] >: > > ----- Forwarded message from K1FZ-Bruce ----- > > Date: Tue, 22 Mar 2016 09:04:06 -0400 > From: K1FZ-Bruce > Reply-To: [email protected] > 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 _________________ Topband Reflector Archives - http://www.contesting.com/_topband
