[TenTec] SLIGHTLY OT

Nathan Moreschi n4ydu at yahoo.com
Fri Apr 8 14:18:06 PDT 2011


Mike,

That will make a super multi-band antenna in terms of loss...Just not 
below 80M.

73,

Nate/N4YDU

On 4/8/2011 4:56 PM, Mike Bryce wrote:
> Okay...
>
> So what I just read from the link you sent, if I take and put up a center fed Zepp with 66 feet on each side, fed with 450 open line and assume no loss from the tuner or balun that antenna won't make a even halfway decent multiband antenna?
>
>
> Mike
>
> Sent from my iPhone
>
> On Apr 8, 2011, at 4:33 PM, Steve Hunt<steve at karinya.net>  wrote:
>
>> Mike,
>>
>> Yes, it's a very popular "Ham Myth" - not helped by various articles in QST.
>>
>> TLW is the software supplied by ARRL with the Antenna Book. It
>> calculates the losses and impedance transformations for various types of
>> feedline, given the load impedance. It typically underestimates losses,
>> and I would normally use the VK1OD on-line calculator in preference to
>> it, but that doesn't include a model for 600 Ohm line whereas TLW does.
>>
>> Here are the calculated losses for various types of line - all 110ft
>> long and at 1.9MHz - when terminated in 11-j930 Ohms:
>>
>> TLW, ARRL "generic" 600 Ohm line: 2.6dB
>> VK1OD, Wireman 551 ladderline : 6dB
>> VK1OD, Wireman 551 ladderline (wet): 8.2dB
>>
>> Remember this is all at 160m !!!!
>>
>> If you'd like to know more, take a look at this review of the QST
>> article "The Lure of Ladder Line":
>> http://vk1od.net/transmissionline/LOLL/
>>
>> 73,
>> Steve G3TXQ
>>
>>
>>
>> On 08/04/2011 20:58, Mike Bryce wrote:
>>> Don't shoot me!
>>>
>>> But I always read that open line feed was lossless.
>>>
>>> Mike
>>>
>>>
>>> Sent from my iPhone
>>>
>>> On Apr 8, 2011, at 3:42 PM, Steve Hunt<steve at karinya.net>   wrote:
>>>
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