[Elecraft] Tuner Loss question

[Wes (N7WS)]

Sorry, but the chart is showing mismatch loss.  When we use a tuner, we don't 
suffer mismatch loss; we suffer tuner losses, which despite the claim(s), can be 
appreciable.

N7WS


On 2/11/2014 2:36 PM, tom armour wrote:
> Why do you need to know the loss of the tuner?  Put a power meter after the tuner and see what your rig is putting out.
> Is this the type of chart you are looking for?http://www.packetradio.com/pdfzips/SWRvsPowerNwatts.pdf
> It is not really the tuner that is causing the loss.  It is more the feed line.
> You can test this by using an external tuner and placing a watt meter both in front and behind the tuner and see what kind of loss you are getting.
> Yes the tuner will have loss, but relatively negligible.
>
> 73 - Tom - wa4ta
>
>> Date: Tue, 11 Feb 2014 11:47:19 -0600
>> From: jvandrey at gmail.com
>> To: elecraft at mailman.qth.net
>> Subject: [Elecraft] Tuner Loss question
>>
>> I have lots of data in the loss to be expected in Coax or Open wire when
>> running at higher SWR into a multiband antenna  - however, I do NOT have
>> any real world data on the losses to be expected in a tuner system at
>> higher SWR.
>>
>> So:
>>
>> Are there any numbers available on what additional losses my Elecraft K3
>> (SN 5283) antenna tuner will experience when the SWR is high - say about
>> 5:1 or higher when feeding a multiband antenna with 50 Ohm coax on 20
>> meters?  Should I expect another 3 dB down in signal strength during
>> receive - and also Transmit?  Or are the losses higher or lower then that?
>>   Also, are the losses frequency dependent (like on coax) or are they the
>> same across the bands.
>>
>> Thanks for any available data.
>>
>> Jobst
>> AC0LP
>>