[Elecraft] K3S odd KAT3A behavior and question

[Oliver Dröse]

Not sure about the new KAT3A but the KAT3 relays only have about 30 dB 
isolation so even with ANT2 selected and nothing connected to it you 
will still hear strong signals coupling in from ANT1.

73, Olli - DH8BQA

Contest, DX & radio projects: http://www.dh8bqa.de


Am 04.10.2015 um 18:04 schrieb ae4pb at carolinaheli.com:
> Operator error. I somehow had Ant 2 selected which begs the question as to how I was receiving signals at all (nothing is connected to ant 2). Selecting the actual antenna and such works 100%.
>
>   
>
>   
>
> From: Bob McGraw - K4TAX [mailto:rmcgraw at blomand.net]
> Sent: Friday, October 02, 2015 10:57 PM
> To: Jerry Moore; elecraft at mailman.qth.net
> Subject: Re: [Elecraft] K3S odd KAT3A behavior and question
>
>   
>
> I tried this a couple of times with my K3S.  Didn't notice any difference between the tuner active and tuner bypassed.
>
> Tuner insertion loss is in the order of 1.0 dB or less when matched, depending on which side of 50 ohms it is required to match.  Very low Z matches tend to show a bit more loss than values above 50 ohms.
>
>
>
> 73
> Bob, K4TAX
>
> On 10/2/2015 9:44 PM, Jerry Moore wrote:
>
> I only tuned enough to not be on top of the station.
>
> On October 2, 2015 10:40:28 PM EDT, Bob McGraw - K4TAX  <mailto:rmcgraw at blomand.net> <rmcgraw at blomand.net> wrote:
>
> If I understand this correctly.   It seems you set / tuned the ATU for a
> higher frequency, being the 2nd frequency where you listened, then moved
> back down band with out retuning.  It would seem then the ATU would be
> set for some frequency other than the one you were receiving.  Yes,
> going to bypass might indeed likely show a higher received signal.
>   
> 73
> Bob, K4TAX
>   
> On 10/2/2015 2:00 PM, ae4pb at carolinaheli.com wrote:
>
>   I was playing with my K3S listening to code on 40m. I could clearly hear the
>   signal but it wasn't loud. I spun the dial up a good bit and listened,
>   nothing heard after about a minute so I pressed ATU Tune. The ATU clicked a
>   few times and stopped. I spun back down where I was (somewhere around
>   7.033MHz) and dialed in the signal. Sounded about the same. Just for grins I
>   did a long press ATU Tune (ATU) to BYPASS. The signal immediately jumped
>   over S9 (was around S7 before). That didn't make sense so I repeated the
>   process a few times with the same results.
>   
>     
>
>   
>
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