[Elecraft] KAT3 in 6m

[Joe Subich, W4TV]

> What makes me quibble is that I don't think that the very small
 > difference in cable lengths -- 1 or 2 cm -- could possibly make a
 > difference at 6 m.

Just thinking out loud ... lead dress might make a difference.  Since
ANT 1 is closer to the place the wires pug into the KAT3, a builder
might coil the excess wire while ANT 2 might be straight.  The extra
inductance ANT 1 vs. ANT 2 might make a difference.

73,

    ... Joe, W4TV


On 8/16/2011 8:51 PM, Vic K2VCO wrote:
> Well, that takes care of most of my points. There is a possibility that even 'bypass' is
> different for ant1/2, because, as you know, 'bypass' compensates for the reactance of the
> traces, etc. and does not actually remove the tuner from the circuit.
>
> What makes me quibble is that I don't think that the very small difference in cable
> lengths -- 1 or 2 cm -- could possibly make a difference at 6 m.
>
>
> On 8/16/2011 3:48 PM, Johnny Siu wrote:
>> Perhaps, I should clarify my measurement. The power readings were taken by LP100A on a
>> Bird dummy load under 'BYPASS' mode. To reiterate, inmy case, I got higher RF output when
>> connecting my 6m ant to ANT 1.
>>
>> TNX&  73,
>>
>>
>> Johnny VR2XMC
>> *從︰* Vic K2VCO<k2vco.vic at gmail.com>
>> *收件人︰* elecraft at mailman.qth.net
>> *傳送日期︰* 2011年08月16日 (週二) 11:37 PM
>> *主題︰* Re: [Elecraft] KAT3 in 6m
>>
>> But keep in mind that the antenna tuner parameters are saved per band AND per antenna. So
>> the tuner may be set slightly differently for the two antenna outputs. I suspect that if
>> you set the tuner to BYPASS and checked with a dummy load they would be the same.
>>
>> Also many digital wattmeters have poor resolution. Maybe the difference between 82 and 92
>> watts is just one bit and the power is close to 87 watts in both cases!
>>
>> On 8/15/2011 11:00 PM, Johnny Siu wrote:
>>   >
>>   >  Hello Group,
>>   >
>>   >  I found something interesting. As some of you may be aware the pin 1 wire to ANT1 is
>>   >  shorter than pin 2 wire to the ANT 2. All the way through, I connect my 6m hamstick to
>>   >  ANT2 and 20m hamstick to ANT 1.
>>   >
>>   >  Last evening, I did a swap with 6m hamstick on ANT 1(the one with shorter pin 1 wire).
>>   >  I got 92w out which is more than the usual 82w. In other words, the length of the
>>   >  wiring from the pin to ANT socket does matter. In my case, I got higher RF output when
>>   >  connecting my 6m ant to ANT 1.
>>   >
>>   >  There is no adverse effect to 20m hamstick which is connected to ANT 2. I just share my
>>   >  experience with other elecrafters with low RF output in 6m.
>>   >
>>   >  TNX&  73,
>>   >
>>   >
>>   >  Johnny VR2XMC ______________________________________________________________ Elecraft
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>> --
>> Vic, K2VCO
>> Fresno CA
>> http://www.qsl.net/k2vco/
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