Base Long wire antenna for cb?

[Tweetybird]

All the rest of you guys too

 

[Tweetybird]

I will buy as soon as funds become available,thank you.

I need this lots of knobs. And quesions

 

[Tweetybird]

That depends on how you connected the ladder line to your receiver. How did you do that?

Wrong bj showed me the right way works good now

 

[Captain Kilowatt]

If that is true, then something is wrong with the way you did your Doublet. The Doublet if correctly done should have much greater "capture area" than the CB antenna on most shortwave bands.

EXACTLY what I was thinking.

 

[Captain Kilowatt]

Lafayette HE-80
General Coverage Shortwave Communications Receiver
(1964)

http://www.noobowsystems.org/restorations/he-80/he-80-en.html

https://www.ecrater.com/p/14787374/lafayette-he80-he-80-receiver-service

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Ladder line connects Here

WRONG!! That antenna connector is UNBALANCED whereas ladder line is BALANCED. The antenna connector is labelled A and E. The A means ANTENNA and the E means EARTH aka GROUND. Connecting ladderline here grounds one side of the ladderline and antenna. NOT what you want to do.

 

[Captain Kilowatt]

Carbon fiber does conduct electricity. It is not as good of a conductor as most metals, but if you build a structure with it, you will find that its electrical conduction can easily contribute to galvanic corrosion, by electrically connecting dissimilar metals. Or wet environment galvanic current carrying.
Carbon fiber is NOT an insulator!

Definitely more of a concern when transmitting but yes I agree......carbon fibre and antennas do not mix.

 

[Tweetybird]

WRONG!! That antenna connector is UNBALANCED whereas ladder line is BALANCED. The antenna connector is labelled A and E. The A means ANTENNA and the E means EARTH aka GROUND. Connecting ladderline here grounds one side of the ladderline and antenna. NOT what you want to do.

I used two pieces of coax, centers to the screws. The shield soldered at both ends. I am hearing a lot more than I was.what do i do?

 

[Tweetybird]

Hook both to A and run a ground to other?

 

[Captain Kilowatt]

It's a receiver. Nothing bad will happen like if it was a transmitter. Ideally you would use a balun between the feedline and the receiver to convert from BALunced to UNbalanced.

 

[Shadetree Mechanic]

The standoffs should be PVC/fiberglass etc. something NON-conductive and should not touch any metal.

I like the yoke, but the crimp connectors make me think about the lights on my trailer. I got tired of redoing the connectors because of exposure to the elements. I now use dielectric silicone grease and squirt it into the connectors before I insert the wire. Just my 2 cents.

 

[M0GVZ]

Sir,

I doubt if you see any antenna a wavelength long with 20dB gain ?

Try modelling them. In my case the antenna was an 85ft long inverted L being used on 20m band and it performed with lobes and nulls exactly as the modelling software illustrated. Modelling it for the 10m band showed even more lobes and nulls.

[Now, you see I had some "sarcasme" above, thats because i know you are a frequent writer, (no harm ment, but you know a lot...).

Several years ago I used to be into contesting. I have a wall of first place certificates for CQ-WW, CQ-WPX, ARRL International DX, IARU HF and even a first in world in class in CQ-WPX-RTTY. Even though I was only running 100W my entries would be in the top 20% of all entries, regularly beating those running 1.5kW into antenna farms. My antennas? Up to 2015, a Cobwebb and an inverted L which I used to adjust the length of to get that 20dB gain you claim doesn't exist. In 2012 in the CQ-WW contest I did a 10m only low power entry using that long wire and worked 91 countries in 16hrs that weekend, getting 1st place in England, 25th in Europe, 57th in World.

So how did I manage this feat? Lots and lots of hours learning about antennas, learning modelling, building and testing what I modelled going through hundreds of feet of wire.

 

[Henry HPSD]

Good morning Sir !

Well, it sure "bazzels" me ?

From my point of view: It is not possible to have a wire antenna: inverted L which is only 85 feet long will show you 20dB of gain. Well, maybe it can but then it would be 20dB of gain compared to something really bad.

And absolutly not to irritate you, but claiming how good it is based on trophys isnt providing "facts", i always like facts that can be reproduced.

So lets get back to the facts....
You claim an inverted L 85 feet long provides 20dB of gain.
And the moddeling software is there to confirm it.
Well, im surely intrested !
Looking forward to it.

Kind regards, Henry

 

[binrat]

Try modelling them. In my case the antenna was an 85ft long inverted L being used on 20m band and it performed with lobes and nulls exactly as the modelling software illustrated. Modelling it for the 10m band showed even more lobes and nulls.



Several years ago I used to be into contesting. I have a wall of first place certificates for CQ-WW, CQ-WPX, ARRL International DX, IARU HF and even a first in world in class in CQ-WPX-RTTY. Even though I was only running 100W my entries would be in the top 20% of all entries, regularly beating those running 1.5kW into antenna farms. My antennas? Up to 2015, a Cobwebb and an inverted L which I used to adjust the length of to get that 20dB gain you claim doesn't exist. In 2012 in the CQ-WW contest I did a 10m only low power entry using that long wire and worked 91 countries in 16hrs that weekend, getting 1st place in England, 25th in Europe, 57th in World.

So how did I manage this feat? Lots and lots of hours learning about antennas, learning modelling, building and testing what I modelled going through hundreds of feet of wire.

I have seen a grain storage bin that was loaded up produce great results as well. It's all about band conditions as well as antenna.

 

[Beetle]

I have seen a grain storage bin that was loaded up produce great results as well. It's all about band conditions as well as antenna.

Did you use a siloading coil? (Sorry.)

 

[Marconi]

Try modelling them. In my case the antenna was an 85ft long inverted L being used on 20m band and it performed with lobes and nulls exactly as the modelling software illustrated. Modelling it for the 10m band showed even more lobes and nulls.

M0GVZ, if you would show us your models with some detail, I will then try and duplicate your model of an Inverted L idea at 20m's just as you've suggested.

I'm curious, how your antenna works and is able to produce nulls and peaks in the pattern at various angles.

I'm referring to a model at 1.84 MHz in the ARRL Antenna Handbook, 19th Edition, page 6-29 posted in the PDF file below. I see no nulls produced in this model.