Topband: Long Beverages and distant feed points

[Lee J. Imber (WW2DX)]

Here is a short video I did of a 720' beverage fed with 1000' of RG6 a  
couple weeks ago.

http://www.youtube.com/watch?v=AmNjvHxJWgw&feature=youtube_gdata

73

Lee J. Imber
WW2DX

Sent from my iPhone

On Nov 18, 2009, at 3:19 PM, Colin Cook <col.kat at btinternet.com> wrote:

> gm0vhr wrote:
>> I can run one of the beverages at about 290 deg that is over 1150'  
>> long but
>> the feed point will be about 600' from the shack. Is this too long  
>> for a
>> beverage and is the feed point a little too far away? I know coax  
>> losses
>> are less important with RX ariels but is there a sensible limit  
>> when it
>> come to the distance to the feed point?
>
> At P40V in 1988, we had to sets of Beverages out in a huge field.  
> One was
> for 80M and the other for 160M. The five 80M Beverages were about  
> 450 feet
> long with a center about 1000 feet from the shack. The three Topband
> Beverages were 900 feet long with their center about 2000 feet from  
> the
> shack. At each center, we had a switch and a preamp run off of an  
> automobile
> battery. They worked incredibly well over coral. You may not need a  
> preamp
> at 600 feet, but it can be done with the dimensions you mention.
>
> 73, Wayne, N7NG
> Jackson Hole, Wyoming
>
>
> The feed point for Our beverages at W3PP were at least 600 feet from  
> the
> shack.  We used RG-6 75 ohm flooded  coax.  The longest beverage we  
> had was
> around 600 feet.
>
> I am not sure there is a lot to be gained with the extra 500 feet,   
> If you
> have the room I think you might consider two 525 footers in different
> directions or leave them unterminated so that they are bi- 
> directional. On
> the other hand at this qth, 300 feet is the max I can go and 1100  
> feet would
> Seem like paradise to me.  We hear GM3POI very loud here with what  
> ever he
> Is transmitting with.  He is probably listening on beverages to hear  
> us on
> the east coast of the USA.
>
> 73
>
> Chet  N4FX
>
>
> One, the feedline is not too long.  Youll maybe need to treat it for
> common mode in a couple of places.
>
> My only BEV is 600' long to the NE (eu).  It works well on 160 but it
> works better on 80.  That tells me that it would be better on 160 if  
> it
> was longer. My feedline is about 500' of RG6. I have a 10db preamp at
> the head end, with power supplied through the coax.
>
> Have fun
>
> Dean W5PJR
> Tijeras, NM
>
>
>
> 290 deg is an excellent direction from UK for most USA. However a bit
> off beam for W7s, KL7s, KH6s etc which come in 330deg/360deg.
> 1150ft  is very long, and will make the beverage very directive  
> (only 51
> degrees beamwidth and low angle 22 degrees elevation lobe, -6dBi gain,
> approx), a real killer rx ant if the DX is close to that direction.
>
> If I was in happy position of having that antenna, and didnt have  
> space
> for other directions, I would try putting a relay in the middle as  
> could
> hear a wider azimuth range when half or third the length. A 600ft
> beverage 4ft high has approx 73deg beamwidth and 30 degree elevation
> main lobe, -10dBi gain. A 400ft beverage has approx 97deg beamwidth  
> and
> 40 degree elevation main lobe. */Has anyone else tried this with one
> wire?/ *
>
> 600ft feeder is no problem.  Satellite TV duofoil-type coax is
> relatively cheap and has relatively low loss on 160/80m.
> Beverages 4 ft high are between approx -5dBi to -15dBi gain, so  
> another
> few dB even from lossy coax should not be a problem with modern
> sensitive rxs, or if necessary with external extra preamp in shack. I
> use up to 1200ft without problem. Take normal precautions for common
> mode and critter attack!
> 73's
> John G3PQA
>
>
>
>
> Feeding your Beverage 600' from the shack should not be a problem.
> Loss in most kinds of coax will be very low at lowband frequencies,
> and it will be nothing like the negative gain figures you'll realize
> from the Beverage itself.
>
> The feed point of my Beverage is over 1000' from the shack, and I feed
> it with RG-6 coax.  The preamp is in the shack so that I can easily
> disconnect it during storms.  Most of the time, signals from the
> Beverage are within 1 S-unit of the signal strengths I see on the
> Inverted-L on 160.
>
> The coax, of course, is buried in conduit.  Couldn't keep the horses,
> goats, & donkeys away from it, when I hung it on the fence.
>
> 73,
> Brad, KV5V
>
>
>
>
>
>
>
>
>
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> _______________________________________________
> 160 meters is a serious band, it should be treated with respect. -  
> TF4M