[Elecraft] Re: Strange KAT100 Symptom

[Joe Squarzini]

Wayne, thanks. Sounds like 1.04 might fix it. I will also try some ferrite 
rf suppression on the control cables. I will order 1.04 ASAP. Thanks for 
the fast response.  Joe


At 07:00 PM 1/4/2003, you wrote:
>Hi Joe,
>
>Chances are you have more RF getting into the control cable on 17 m than 
>on the
>other bands. This will affect the peak SWR readings much more in SSB mode than
>in CW mode. It's purely an aesthetic issue--the SWR is no doubt actually close
>to 1:1 as indicated in TUNE mode.
>
>We recently updated the KAT100 firmware to revision 1.04, making several minor
>changes. One of them was to corrent the tendency for SSB signals to show SWR
>higher than reality on voice peaks. This is likely to fix your 17 m problem,
>despite the possibility of higher RF on the cable on this band. We now do 
>more averaging.
>
>In addition, Rev. 1.04 lets you install KAT100 jumpers W1 and W2 to 
>override the
>K2's normal dot/bar LED modes (as set by the GRPH MENU entry). W1 forces DOT
>mode and W2 forces BAR mode. It also fixes a problem on 160 meters. With
>revision 1.03, the inductance value for antenna 1, on 160 meters, is lost when
>you turn off the K2, requiring a re-tune.
>
>I'll make sure we've added a KAT100 firmware upgrade to our order page.
>
>73,
>Wayne
>
>
>Joe Squarzini wrote:
> >
> > My setup is the following: fully loaded K2 #2731 with KPA100 and KAT100
> > both installed in EC-2 enclosure. Everything functions flawlessly EXCEPT
> > when transmitting on 17m SSB the LED SWR indicators on the KAT100 will
> > follow the modulation of the signal up to an indication of 1.5 on the LEDs
> > even though the tune function reports an SWR of 1.1. All other bands
> > operate according to spec. On the air QSO's report excellent signal
> > quality. An external SWR meter shows SWR of 1.1 and a power of 100 watts
> > same as the K2 display. One would suspect that RF is getting into the
> > KAT100 and affecting the diode display. Why not on other bands? A resonance
> > situation only on 17m? The SWR bridge in the KAT100 is reporting the
> > correct SWR but that is in response to a CW signal. The CW performance is
> > according to spec. Anybody see this before?    Joe

Joe Squarzini, Jr.
K4AA

Home      (703) 759-4943
FAX        (703) 759-0656
k4aa@verizon.net

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