[TowerTalk] steppir v. lpda

[F.R. Ashley]

Its not on 12 or 17.  I have to use wires for those bands, which is one 
reason this thread got started, remember?
I've had a TH7 for a number of years, I still have worked anyone I've 
heard,. wire antennas included..  As for sitting around all day trying to 
work a DX station, well I'd never do that anyway, its not important to me.

73 Buddy WB4M



> How's that TH7 on 17 and 12? K7ZA
> ----- Original Message ----- 
> From: "F.R. Ashley" <gdadx2 at clearwire.net>
> To: "Tower and HF antenna construction topics." <towertalk at contesting.com>
> Sent: Sunday, January 24, 2010 01:24
> Subject: Re: [TowerTalk] steppir v. lpda
>
>
>>
>> Am I going to work something on a SteppIR that I can't work on a LP?  Or 
>> a
>> TH7?
>> Don't think so.
>>
>> 73 Buddy WB4M
>> ----- Original Message ----- 
>> From: "Steve, W3AHL" <w3ahl at att.net>
>> To: "Tower and HF antenna construction topics." 
>> <towertalk at contesting.com>
>> Sent: Saturday, January 23, 2010 8:05 PM
>> Subject: Re: [TowerTalk] steppir v. lpda
>>
>>
>>> Since the Tennadynes that I've seen have a 50 ohm nominal feed point Z,
>>> not
>>> 200 ohm, the issue is a little different.
>>>
>>> Having a balun at the front of the boom isn't a problem if it's
>>> constructed
>>> correctly.  Using a coil of coax bundled up and flapping in the breeze
>>> will
>>> eventually lead to failure probably.  A better solution is to use 
>>> ferrite
>>> core balun is mounted in a weatherproof plastic box with its output
>>> terminals screwed into the boom / transmission line.
>>>
>>> Some Tennadyne owners do place the 1:1 balun at the mast plate and claim
>>> there is no significant difference in the pattern.
>>>
>>> What affect the feed line imbalance has in either case hasn't been
>>> evident
>>> in the few field measurements I've seen posted.  Whether it is enough to
>>> justify constructing a custom balanced feed line back to the mast is
>>> doubtful, if a couple of ferrites at the mast are effective.
>>>
>>> LPDA's that do use a 200-ohm transmission line boom usually have a feed
>>> point Z of 95-110 ohms.
>>>
>>> Steve, W3AHL
>>>
>>> ----- Original Message ----- 
>>> From: "Gene Fuller" <w2lu at rochester.rr.com>
>>> To: "Tower and HF antenna construction topics."
>>> <towertalk at contesting.com>
>>> Sent: Saturday, January 23, 2010 4:23 PM
>>> Subject: Re: [TowerTalk] steppir v. lpda
>>>
>>>
>>>> For the umpteenth time,ehy not make up 200 ohm  line,using 1/4" copper
>>>> tubing, on standoffs to keep aay from the boom, placing the balun back
>>>> at
>>>> the mast, where it is accessible.
>>> ..snip..
>>>
>>> _______________________________________________
>>>
>>>
>>>
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