[Elecraft] KAT3A Question

[Bob McGraw K4TAX]

My 6M yagi shows a 5.3:1 SWR as indicated on my K3S on 28.3MHz with the 
ATU in Bypass mode.   When the KAT3A ATU  in the radio resolves a match, 
the indicated SWR indicated is 1.1:1 on the radio.

Using the same antenna but using my KAT500 ATU the best SWR resolved is 
1.6:1 as indicated on the radio.

Now my antenna analyzer on 28.3 MHz with my 6M yagi connected shows and 
SWR of 7.5:1, a Z value of 16.6 ohms, and R value of 7.3 ohms and the X 
value of 14.7.

That same antenna on the analyzer at 50.2MHz shows the SWR at 1.2:1, Z 
at 39.9, R at 40.0 and Z at 0.0

My conclusion:  although the SWR values may be indicating acceptable 
values, the 6 meter Yagi operated on 10 meters would make a very lousy 
antenna.   You'd be much better off to use an 80 meter dipole or better 
yet, just a 10 meter dipole.

73

Bob, K4TAX

On 4/11/2020 4:06 PM, John Stengrevics wrote:
> My 6 meter antenna reads an SWR of 10:1 on 10 meters.  The KAT3A specs suggest it can tune that degree of mismatch.  Is it reasonable to think that the KAT3A could match my antenna well enough for 10 meters?
>
> Thanks & 73,
>
> John
> WA1EAZ
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Elecraft at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to rmcgraw at blomand.net
>