[TenTec] Antenna is up, but the coupler doesn't like 160 meters

[Bob McGraw - K4TAX]

This link works.  ..

And yes some years ago I modified my 238 with the referenced caps.  High 
power drife problem solved.

73
Bob, K4TAX


----- Original Message ----- 
From: "Mike, K9UW" <k9uw at wi-net.com>
To: "Clayton Brantley" <clayton_n4ev at yahoo.com>; "Discussion of Ten-Tec 
Equipment" <tentec at contesting.com>
Sent: Saturday, October 12, 2013 12:44 PM
Subject: Re: [TenTec] Antenna is up, but the coupler doesn't like 160 meters


> Try http://n6ie.com/Ten_Tec_238.html
>
> 73, de Mike, K9UW
> Amherst, WI
>
>
> On 10/12/2013 12:15 PM, Clayton Brantley wrote:
>> Sorry guys.  I am using Yahoo and they are going thru a downgrade in 
>> their services.  They have went from
>> a working system to something a pre-schooler would dream up.
>>
>> Here is a link to the web site for the 229/238 tuner mod:
>>
>>          www.n6ic.com/Ten_Tec_238.htm
>>
>> Hope this works, if not simply Google TenTec 229 mod and you should see 
>> it.
>>
>> Clayton N4EV
>>
>>
>>
>>
>>
>> On Saturday, October 12, 2013 1:06 PM, Rick - DJ0IP / NJ0IP 
>> <Rick at DJ0IP.de> wrote:
>>   THAT'S THE PROBLEM, MIKE!  (the Chinese have smaller feet than we do)
>>
>>
>> -----Original Message-----
>> From: TenTec [mailto:tentec-bounces at contesting.com] On Behalf Of Mike 
>> Bryce
>> Sent: Saturday, October 12, 2013 5:59 PM
>> To: Discussion of Ten-Tec Equipment
>> Subject: Re: [TenTec] Antenna is up, but the coupler doesn't like 160 
>> meters
>>
>> bob and the gang,
>>
>> inserted the 259 and with the 1:1 balun.
>>
>> resonate freq is 2.487 or there abouts
>>
>> so the antenna as it sits is too short.
>>
>> I'll re-check the length with my harbor freight made in china 300 foot 
>> tape
>> and see what each leg is (length wise)
>>
>>
>> Mike Bryce, WB8VGE
>> the heathkit shop
>> SunLight energy systems
>> J e e p
>> o|||||||o
>>
>>
>>
>>
>>
>>
>> On Oct 12, 2013, at 10:42 AM, Bob McGraw - K4TAX wrote:
>>
>>> The extra / external cap is used across the capacitor bank, starting at
>> position #4 and #5.  Both on the Low and High Z sides.  I find the text 
>> is
>> incorrect, the schematic is correct.  Yes a .01 is way too much C by a
>> factor of 10x.
>>> If you have a means to do so, what is the natural resonant frequency of
>> the antenna?  I use my MFJ-259 as a grid dip meter effect to find the
>> resonant frequency.  I'm not speaking of some frequency where the SWR is 
>> 1:1
>> or such.
>>> I take a different approach to antennas.  I first start with a resonant
>> antenna at the desired frequency, then adjust the height of the antenna 
>> to
>> attain the desired feed point impedance.  I saw Jim Brown, K9YC mentioned
>> this in his earlier post as he used different coax impedance lines 
>> dependant
>> on the height of the antenna.  I am not one to "prune" the length of the
>> antenna for some SWR value.  Now in cases I know we can't get the antenna 
>> at
>> different heights specially as we get to 160M and to some extent 80M.  In
>> these cases, the typical height above ground does bring the center Z to 
>> 20
>> to 30 ohms.  Nothing wrong with this.  With low loss coax or a balanced
>> feed, just let the tuner deal with it.  That's what it is supposed to do. 
>> I
>> find having a resonant wire is more effective and easier to effect a good
>> match.
>>> 73
>>> Bob, K4TAX
>>>
>>>
>>>
>>>
>>>
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>
>
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