[TenTec] ORIONII_INTERNAL_AT_TUNER

[Denton]

Wonder what it would take to homebrew a true automatic link coupled antenna 
tuner?
----- Original Message ----- 
From: "Robert & Linda McGraw K4TAX" <RMcGraw at Blomand.Net>
To: <w2yj at highstream.net>; "Tentec" <tentec at contesting.com>
Sent: Saturday, December 31, 2005 5:17 PM
Subject: Re: [TenTec] ORIONII_INTERNAL_AT_TUNER


> George:
>
> First from my point of view, 4:1 baluns should not be used in this
> application.  I wouldn't expect it to work.  Based on your 
> antenna/feedline
> configuration the actual feed Z of the antenna may be more near 25 ohms.
> Thus with a 4:1 balun the load the tuner must match is 25/4 or 6.5 ohms.
> Very few if any tuners will match efficiently below about 15 ohms.
>
> You should be using a 1:1 current balun in all applications, all
> configurations.  The 4:1 balun should reside in the trash can.
>
> History:  4:1 baluns became popular due to hams making folded dipoles from
> TV type line or open wire line.  In this configuration the resonant feed Z
> is more like 200 to 300 ohms.  Thus with a 4:1 balun the load to the
> transmitter is in the order or 50 to 75 ohms which is great for most
> transmitters with those being link coupled outputs or with the new pi
> networks.
>
> Happy New Year
>
> 73
> Bob, K4TAX
>
>
> ----- Original Message ----- 
> From: "George K" <w2yj at highstream.net>
> To: "Discussion of Ten-Tec Equipment" <tentec at contesting.com>
> Sent: Friday, December 30, 2005 2:12 PM
> Subject: [TenTec] ORIONII_INTERNAL_AT_TUNER
>
>
>> My original Orion with internal tuner would not tune the lower ends of 80
>> and 160 meters.
>> The antenna is a 270 foot center fed with open wire terminating at a 4:1
>> balun outside the shack and then on into the OrionII rig with 20 feet of
>> coax.
>> The OrionII has no problem with either band on the lower ends tuning to
>> 1.2:1???
>> Did TT beef up the tuners capabilities in the, new and improved,
>> OrionII???
>> If not I can't think of what I may have done since receiving the OII.
>> I'm elated, but in a quandary.
>> George
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>>
>
>
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