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
>>
>>
>
>
> _______________________________________________
> TenTec mailing list
> TenTec@contesting.com
> http://lists.contesting.com/mailman/listinfo/tentec
>
_______________________________________________
TenTec mailing list
TenTec@contesting.com
http://lists.contesting.com/mailman/listinfo/tentec
|