[AMRadio] Re: [Boatanchors] Feedline Spreaders


david knepper collinsradio at adelphia.net
Thu Feb 15 09:53:17 EST 2007


Sandy, I am going to use 6 inch spacers that are made of ceramic.  I have 
some E.F. Johnson round spacers that will be part of the system.

I would think that I will use a lot of spacers if I space them 1 foot apart.

I guess it is a matter of keeping the two wires from touching.

Would you recommend a double extended Zepp or just a Zepp, 134 feet?  I 
thought of going 265 feet with the feeders attached in the middle of the 
antenna with an insulator of course.

Somehow, I seem to be going backwards instead of forward in time.  We are 
going to "construct" an old time shack from the 30's and need an authentic 
antenna configuration with a Collins antenna tuner.

Thanks

Dave, W3ST
Publisher of the Collins Journal
Secretary to the Collins Radio Association
www.collinsra.com - the CRA Website
Now with PayPal
CRA Nets: 3.805 Mhz every Monday at 8 PM EST
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----- Original Message ----- 
From: "Sandy W5TVW" <ebjr at i-55.com>
To: "Jim Brannigan" <jbrannig at optonline.net>; "david knepper" 
<collinsradio at adelphia.net>; <boatanchors at mailman.qth.net>; 
<amradio at mailman.qth.net>
Sent: Thursday, February 15, 2007 9:45 AM
Subject: Re: [Boatanchors] Feedline Spreaders


> The spacing isn't very critical at all.  Anything from 2-6" spacing and 
> wire from #16-#12.  Single conductor black plastic insulated wire works 
> just fine.  #14 guage OK.  If you make the insulators so they are spaced 
> about 4" and place a spacer every foot.  The spacers can be wood that's 
> been soaked in hot beeswax for a while.  Don't try regular paraffin 
> sealing wax as it will melt in the sun.  Beeswax will not.  Spacers can be 
> made from any DARK plastic (plexiglas, lexan, etc.)  Avoid clear plastic 
> as the sun will ruin it after a year or so.  Years ago guys were using 
> plastic "Toni" haircurlers, but the sun played hob with them after a 
> while.  Impedance? Anything from around 250-600 ohms OK.  I no longer use 
> home brewed open wire as the "window" twin lead is too readily available 
> (common 450 ohm stuff) and will handle a KW. all OK.
>
> 73,
> Sandy W5TVW
> ----- Original Message ----- 
> From: "Jim Brannigan" <jbrannig at optonline.net>
> To: "david knepper" <collinsradio at adelphia.net>; 
> <boatanchors at mailman.qth.net>; <amradio at mailman.qth.net>
> Sent: Thursday, February 15, 2007 8:23 AM
> Subject: Re: [Boatanchors] Feedline Spreaders
>
>
>>
>> What impedance are you looking for?
>>
>> The "Handbook" has formulas.
>>
>> Jim
>>
>>> What is a "good" spacing between 6 inche spreaders, using #14 wire, let 
>>> us say.
>>>
>>> Thank you
>>>
>>> Dave, W3ST
>>
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