Elecraft

Twin Lead feedline

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Thom LaCosta

Twin Lead feedline

It's been years since I melted 300 ohm twin lead...

Can I use it for a 44 foot each side of center doublet at 100 watts out? I
can't find any other open wire feedline locally, and I need to get something up
in the air....I keep on walking into the slinky that runs down my hallway.

I'm thinking at 5 watts it will pass...just not sure what will happen at 100
watts.

Thanks

73 k3hrn
Thom,EIEIO
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Joe-aa4nn

Re: Twin Lead feedline

I have put 300 watts from a single 813
grounded grid amp into a doublet made
using 300 ohm twin lead. No problem.
de Joe, aa4nn

----- Original Message -----
From: "Thom LaCosta" <[hidden email]>
To: <[hidden email]>
Sent: Tuesday, August 14, 2007 7:26 AM
Subject: [Elecraft] Twin Lead feedline

> It's been years since I melted 300 ohm twin lead...
>
> Can I use it for a 44 foot each side of center doublet at 100 watts out?
> I can't find any other open wire feedline locally, and I need to get
> something up in the air....I keep on walking into the slinky that runs
> down my hallway.
>
> I'm thinking at 5 watts it will pass...just not sure what will happen at
> 100 watts.
>
> Thanks
>
> 73 k3hrn
> Thom,EIEIO
> Email, Internet, Electronic Information Officer
>
> www.baltimorehon.com/ Home of the Baltimore Lexicon
> www.tlchost.net/hosting/ Web Hosting as low as 3.49/month
> _______________________________________________
> Elecraft mailing list
> Post to: [hidden email]
> You must be a subscriber to post to the list.
> Subscriber Info (Addr. Change, sub, unsub etc.):
> http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/subscribers.htm
> Elecraft web page: http://www.elecraft.com
>

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n6wg

Re: Twin Lead feedline

In reply to this post by Thom LaCosta

Thom
There are various grades of 300 ohm twinlead.
Some are very cheap and have pretty skimpy
conductors. Some are good quality. There is/was
at least one version that was suitable for transmitting
(power level not stated that I can recall). If you
have some of the good quality stuff, you can probably
do 100w just fine. I'd watch out for the skimpy stuff,
though.
Good luck and 73
Bob N6WG

----- Original Message -----
From: "Thom LaCosta" <[hidden email]>
To: <[hidden email]>
Sent: Tuesday, August 14, 2007 4:26 AM
Subject: [Elecraft] Twin Lead feedline

> It's been years since I melted 300 ohm twin lead...
>
> Can I use it for a 44 foot each side of center doublet at 100 watts out?
I
> can't find any other open wire feedline locally, and I need to get
something up
> in the air....I keep on walking into the slinky that runs down my hallway.
>
> I'm thinking at 5 watts it will pass...just not sure what will happen at
100

> watts.
>
> Thanks
>
> 73 k3hrn
> Thom,EIEIO
> Email, Internet, Electronic Information Officer
>
> www.baltimorehon.com/ Home of the Baltimore Lexicon
> www.tlchost.net/hosting/ Web Hosting as low as 3.49/month
> _______________________________________________
> Elecraft mailing list
> Post to: [hidden email]
> You must be a subscriber to post to the list.
> Subscriber Info (Addr. Change, sub, unsub etc.):
> http://mailman.qth.net/mailman/listinfo/elecraft
>
> Help: http://mailman.qth.net/subscribers.htm
> Elecraft web page: http://www.elecraft.com

Jozef Hand-Boniakowski

Re: Twin Lead feedline

I have been using TruValue twin lead at $14/100 feet for the past 4
years on both my G5RV and my 40 meter loop. Works just fine. Best
bargain around. Since I only need 40 feet on either antenna, if it goes
bad, I just use the other half of what is left with some to spare.

Jozef WB2MIC

PS. The antenna wire is leftover electric fence wire now over 22 years
old. Cost per antenna per year is quite low. :)

Robert Tellefsen wrote:

> Thom
> There are various grades of 300 ohm twinlead.
> Some are very cheap and have pretty skimpy
> conductors. Some are good quality. There is/was
> at least one version that was suitable for transmitting
> (power level not stated that I can recall). If you
> have some of the good quality stuff, you can probably
> do 100w just fine. I'd watch out for the skimpy stuff,
> though.
> Good luck and 73
> Bob N6WG
>
> ----- Original Message -----
> From: "Thom LaCosta" <[hidden email]>
> To: <[hidden email]>
> Sent: Tuesday, August 14, 2007 4:26 AM
> Subject: [Elecraft] Twin Lead feedline
>
>
>
>> It's been years since I melted 300 ohm twin lead...
>>
>> Can I use it for a 44 foot each side of center doublet at 100 watts out?
>>
> I
>
>> can't find any other open wire feedline locally, and I need to get
>>
> something up
>
>> in the air....I keep on walking into the slinky that runs down my hallway.
>>
>> I'm thinking at 5 watts it will pass...just not sure what will happen at
>>
> 100
>
>> watts.
>>
>> Thanks
>>
>> 73 k3hrn
>> Thom,EIEIO
>> Email, Internet, Electronic Information Officer
>>
>> www.baltimorehon.com/ Home of the Baltimore Lexicon
>> www.tlchost.net/hosting/ Web Hosting as low as 3.49/month
>> _______________________________________________
>> Elecraft mailing list
>> Post to: [hidden email]
>> You must be a subscriber to post to the list.
>> Subscriber Info (Addr. Change, sub, unsub etc.):
>> http://mailman.qth.net/mailman/listinfo/elecraft
>>
>> Help: http://mailman.qth.net/subscribers.htm
>> Elecraft web page: http://www.elecraft.com
>>
>
> _______________________________________________
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> Post to: [hidden email]
> You must be a subscriber to post to the list.
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>

David Cutter

Re: Twin Lead feedline

I've just re-read your question. So, the twin lead is not for the feeder,
it's for the arms of the doublet, or possibly both. I presume to widen the
frequency response. There are some interesting ideas for using ribbon as
antennas.

If it's the pale pink variety, the only thing I would advise is to make sure
you water-proof the cut ends because it will drink water by capillary action
and rapidly rot the copper inside. This happened to me many years ago. If
it's the black ladder line, I would say it is quite heavy compared to single
wires.

Otherwise I see no particular problems.

David
G3UNA

----- Original Message -----
From: "Jozef Hand-Boniakowski" <[hidden email]>
To: "Robert Tellefsen" <[hidden email]>
Cc: <[hidden email]>
Sent: Tuesday, August 14, 2007 5:02 PM
Subject: Re: [Elecraft] Twin Lead feedline

>I have been using TruValue twin lead at $14/100 feet for the past 4 years
>on both my G5RV and my 40 meter loop. Works just fine. Best bargain
>around. Since I only need 40 feet on either antenna, if it goes bad, I
>just use the other half of what is left with some to spare.
>
> Jozef WB2MIC
>
> PS. The antenna wire is leftover electric fence wire now over 22 years
> old. Cost per antenna per year is quite low. :)
>
> Robert Tellefsen wrote:
>> Thom
>> There are various grades of 300 ohm twinlead.
>> Some are very cheap and have pretty skimpy
>> conductors. Some are good quality. There is/was
>> at least one version that was suitable for transmitting
>> (power level not stated that I can recall). If you
>> have some of the good quality stuff, you can probably
>> do 100w just fine. I'd watch out for the skimpy stuff,
>> though.
>> Good luck and 73
>> Bob N6WG
>>
>> ----- Original Message -----
>> From: "Thom LaCosta" <[hidden email]>
>> To: <[hidden email]>
>> Sent: Tuesday, August 14, 2007 4:26 AM
>> Subject: [Elecraft] Twin Lead feedline
>>
>>
>>
>>> It's been years since I melted 300 ohm twin lead...
>>>
>>> Can I use it for a 44 foot each side of center doublet at 100 watts out?
>>>
>> I
>>
>>> can't find any other open wire feedline locally, and I need to get
>>>
>> something up
>>
>>> in the air....I keep on walking into the slinky that runs down my
>>> hallway.
>>>
>>> I'm thinking at 5 watts it will pass...just not sure what will happen at
>>>
>> 100
>>
>>> watts.
>>>
>>> Thanks
>>>
>>> 73 k3hrn
>>> Thom,EIEIO
>>> Email, Internet, Electronic Information Officer
>>>
>>> www.baltimorehon.com/ Home of the Baltimore Lexicon
>>> www.tlchost.net/hosting/ Web Hosting as low as
>>> 3.49/month
>>> _______________________________________________
>>> Elecraft mailing list
>>> Post to: [hidden email]
>>> You must be a subscriber to post to the list.
>>> Subscriber Info (Addr. Change, sub, unsub etc.):
>>> http://mailman.qth.net/mailman/listinfo/elecraft
>>>
>>> Help: http://mailman.qth.net/subscribers.htm
>>> Elecraft web page: http://www.elecraft.com
>>>
>>
>> _______________________________________________
>> Elecraft mailing list
>> Post to: [hidden email]
>> You must be a subscriber to post to the list.
>> Subscriber Info (Addr. Change, sub, unsub etc.):
>> http://mailman.qth.net/mailman/listinfo/elecraft
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>> Elecraft web page: http://www.elecraft.com
>>
>>
> _______________________________________________
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