KAT100 Question on SWR/Operation

I have searched the email archives....but have not found an answer to this question about the KAT-100 Tuner.

When the SWR to the antenna is 1:1 without the tuner....(and the KAT100 is in line) does the KAT100 figure that there is no issue and goes to a mode or point where there is no C and no L in the L/C network?  In effect, passing the RF through the unit?  According to the MENU...L = 00.6 and C = 0.30  Looks like there is some L and C still in the circuit.  

OR - when the SWR is 1:1...should the operator take out the tuner?

Any advice or opinion?  (Like this bunch doesn't have any of that)

Lee - K0WA





In our day and age it seems that Common Sense is in short supply.  If you don't have any Common Sense - get some Common Sense and use it.  If you can't find any Common Sense, ask for help from somebody who has some Common Sense.  Is Common Sense divine?
_______________________________________________
Elecraft mailing list
Post to: [hidden email]
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft   

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

[Thom LaCosta]

On Sat, 13 Oct 2007, Lee Buller wrote:

> OR - when the SWR is 1:1...should the operator take out the tuner?

Physically?
>
> Any advice or opinion?  (Like this bunch doesn't have any of that)

You may have made the under-statement of the year.

73 - Thom K3HRN
Zerobeat Ham Forums: www.zerobeat.net/smf
www.tlchost.net/hosting/                 Web Hosting as low as 3.49/month
_______________________________________________
Elecraft mailing list
Post to: [hidden email]
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft   

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

[Jack Brindle]

The KAT100 does not have a relay to bypass the LC circuits. So, with  
an existing match, it still needs to tune out its own impedances in  
order to operate properly. If you know that the antenna is already  
matched, you should tune the KAT100 into a dummy load, then use the  
settings it works out with the matched antenna(s).

In newer tuners (T1 for example) and additional relay has been added  
to bypass the LC circuits so that if the tuner sees a low SWR to  
start off it will stop the tune procedure and go with the bypass  
condition.

Hope this helps!

On Oct 13, 2007, at 5:09 AM, Lee Buller wrote:

>
>
> I have searched the email archives....but have not found an answer  
> to this question about the KAT-100 Tuner.
>
> When the SWR to the antenna is 1:1 without the tuner....(and the  
> KAT100 is in line) does the KAT100 figure that there is no issue  
> and goes to a mode or point where there is no C and no L in the L/C  
> network?  In effect, passing the RF through the unit?  According to  
> the MENU...L = 00.6 and C = 0.30  Looks like there is some L and C  
> still in the circuit.
>
> OR - when the SWR is 1:1...should the operator take out the tuner?
>
> Any advice or opinion?  (Like this bunch doesn't have any of that)
>
> Lee - K0WA

- Jack Brindle, W6FB
------------------------------------------------------------------------
---------------------


_______________________________________________
Elecraft mailing list
Post to: [hidden email]
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft   

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

[Don Wilhelm-4]

Lee,

The KAT100 (note no dashes in Elecraft model numbers - except for the
N-Gen :-) ) does not automatically go to a bypass mode.  If you tune it
into a 50 ohm resistive load, you may find it tunes to some small
inductance and capacity in-circuit and may actually increase the SWR a
small bit because it tunes until the SWR is small and that is not
necessarily SWR = 1 (it may be 1.1 or 1.2 which is close enough at HF).

If you wish the tuner to be in bypass for all bands *and* both antenna
jacks, enter the menu and set it to CAL P or one of the other bypass
states.  But if you need it bypassed for only one band or only one of
the output jacks and *not* the others, just TUNE into a dummy load for
all the bands and/or antenna jack that will connect to the 50 ohm
resonant antenna.

73,
Don W3FPR

Lee Buller wrote:
> I have searched the email archives....but have not found an answer to this question about the KAT-100 Tuner.
>
> When the SWR to the antenna is 1:1 without the tuner....(and the KAT100 is in line) does the KAT100 figure that there is no issue and goes to a mode or point where there is no C and no L in the L/C network?  In effect, passing the RF through the unit?  According to the MENU...L = 00.6 and C = 0.30  Looks like there is some L and C still in the circuit.  
>
> OR - when the SWR is 1:1...should the operator take out the tuner?
>
>  
_______________________________________________
Elecraft mailing list
Post to: [hidden email]
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft   

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com