[Elecraft] [K3] KAT3 and 160 with 40m long doublet

[Don Wilhelm]

  Wes,

It was late last night and I misinterpreted the sign - so yes, that was 
what my eyes at that time did to me.
Your solution is more correct in the light of day.

73,
Don W3FPR

On 1/3/2011 9:06 PM, Wes Stewart wrote:
> Don,
>
> So you want to add +j1000 to +j1000 to get zero?
>
> Wes
>
> --- On Sun, 1/2/11, Don Wilhelm<w3fpr at embarqmail.com>  wrote:
>
>
>>    Wes,
>>
>> I don't know about the -j501, but Kirchoff tells me that a
>> series Xl =
>> j1000 alone will cancel the +j1000 in the shack feedpoint
>> (your example)
>> leaving a 50 ohms pure resistive load, no need for the
>> shunt element.
>>
>> Since the absolute value of the Low Pass L-net impedance
>> requires that
>> Rl be less than Rs, I do not know how a Low Pass section
>> would provide a
>> match.  The matching section must be a High Pass with
>> your values.
>>
>> 73,
>> Don W3FPR
>>
>>
>>
>> On 1/2/2011 10:22 PM, Wes Stewart wrote:
>>> Sort of sounds logical.... but it's wrong.
>>>
>>> Let the load in the shack be 50 +j1000.
>>>
>>> A low-pass L-net with a shunt Xc = -j501 and series Xl
>> = j1000 will do it.
>>> Wes  N7WS
>>>
>>> --- On Sun, 1/2/11, Don Wilhelm<w3fpr at embarqmail.com>
>> wrote:
>>>> As you mentioned, the matching range of the KAT3
>> becomes
>>>> greater as the
>>>> frequency is increased.
>>>> That fact is often overlooked by many hams.
>> It is all
>>>> about the amount
>>>> of L and C available in the tuner, but the
>> inductive or
>>>> capacitive
>>>> reactance is really what counts in producing the
>>>> match.  If the
>>>> feedpoint in the shack has 1000 ohms of inductive
>>>> reactance, and the
>>>> tuner has only 600 ohms capacitive reactance to
>> attempt to
>>>> cancel that
>>>> inductance, then a match will never happen.
>
>
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Elecraft at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>