--------------------------------------------------
From: "Richard (Rick) Karlquist" <richard@karlquist.com>
Sent: Monday, July 19, 2010 7:20 PM
To: "Jim Thomson" <jim.thom@telus.net>
Cc: <towertalk@contesting.com>
Subject: Re: [TowerTalk] back to back baluns..with 450 ohm between em.
>
>
> Jim Thomson wrote:
>> http://www.dxengineering.com/Parts.asp?ID=3585&PLID=50&SecID=10&DeptID=9&PartNo=DXE%2DBAL450%2DH10%2DB%2DP
>>
>> Has anybody uses these items or similar ?? The concept is a 1:9 balun
>> at each end of a 300-1000' run of 450 ohm line... then 50 ohm coax up a
>> tower... that happens to be 300-1000' away.
>
> FWIW:
>
> I ran across this review on eham:
>
> http://www.eham.net/reviews/detail/848?page=2
>
> Scroll down to KE7AMS. He gave this a poor review.
> Says Array Solutions is better. Just passing this
> along.
>
> Rick N6RK
### The fellow was not using a pair of them, back to back..with 450 ohm
line between them. If you use just one 9:1 balun... on a
random length of 450 ohm line.. to a dipole... you will probably fry the 9:1
balun.
"I was using a DX Engineering 9 to 1 balun that would
saturate on 160 meters running 1,000 watts.
My antenna is a 450 ohm ladder line fed Off Center Caged half wave dipole,
with 3 wires and a one meter spacing, for 160 meters."
## For just a pair of back to back 9:1 baluns... the dx eng units may well
have fared better.. and no doubt worked. Having said that.. the
pair of Array solutions 9:1 baluns in the back to back config [ with
450 ohm line between em] would work fine too... and probably better.
## In the back to back config, they are not being stressed, since swr is
low, from end to end.
later... Jim VE7RF
>
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|