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Re: [TenTec] Rhombics

To: tentec@contesting.com
Subject: Re: [TenTec] Rhombics
From: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Reply-to: geraldj@weather.net, Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Tue, 07 Dec 2010 18:04:44 -0600
List-post: <tentec@contesting.com">mailto:tentec@contesting.com>
But then the transmitting antennas in the states might have been curtain 
arrays of dipoles with a mere 20 dB gain fed by 250 or 500 KW RF.

73, Jerry, K0CQ

On 12/7/2010 5:08 PM, James Duffer wrote:
> Sounds good, especially the rhombic.  I visited the  VOA (Voice of America) 
> receive plant at Furstenfeldbruck (spelling?) Germany in the 60s.  They used 
> curtain rhomibics (3 tiers) in a triple space diversity configuration with 
> diversity receivers RCA and Racal the audio sounded like it was coming from a 
> record.  Then then retransmitted it beaming it to other countries  in 
> Europe/Africa
> Jim (wd4air)
>> Date: Tue, 7 Dec 2010 09:30:05 -0800
>> From: n4ydu@yahoo.com
>> To: tentec@contesting.com
>> Subject: Re: [TenTec] Rhombics
>> The beverage is inefficient on both transmit and receive. However, you can 
>> make up for the inefficiency on receive with a preamp or matching network to 
>> take advantage of the directivity qualities (providing it is terminated or 
>> even bidirectional) of a beverage. This is not the case for transmitting.
>> A rhombic would be a super antenna in terms of transmit and receive, 
>> especially if it was terminated and worked in just one direction. One could 
>> theoretically null out noise on the low bands. While some low band yagis 
>> exist, obviously the size and money involved isn't practical for the average 
>> ham. This is when a low cost beverage comes into play and can greatly 
>> enhance one's ability to receive.
>> I use a short beverage on 160 and 80 (sometimes 40) as well as two pennant 
>> RX antennas we good results. It comes in handy during contests to null out 
>> strong signals the the NW and S that interfere with European signals. It 
>> cuts down on the fatigue factor as well.
>> Beverages are used with success on the high bands at a handful of the 
>> multi-multi mega stations with success as well. I believe they are used as 
>> alternatives to cut down on potential interference from other transmitters 
>> within the station (especially in the case of two stations on the same band 
>> that are interlocked).
>> 73,
>> Nate/N4YDU
>> --- On Sun, 12/5/10, JOSEPH DAVIS<iloveantennas@dishmail.net>  wrote:
>> From: JOSEPH DAVIS<iloveantennas@dishmail.net>
>> Subject: Re: [TenTec] Rhombics
>> To: "Discussion of Ten-Tec Equipment"<tentec@contesting.com>
>> Date: Sunday, December 5, 2010, 6:09 PM
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