[Elecraft] KX3 - SWR Display of "--"

[Matt VK2RQ]

Above 10W of power, the KX3 will disable the internal KXAT3 ATU and rely on the amplifier to supply the SWR readings over the ACC1 cable. However, the SWR bridge for the amplifier is part of the KXAT100 ATU option for the amplifier, so if this option is not equipped, the amplifier will not be able to supply any SWR readings. I'm guessing this is the reason you are seeing the '--' dashes for SWR when operating above 10W. If the behaviour is intermittent, it may indicate a problem with your ACC1 cable connection.

73, Matt VK2RQ

> On 22 Nov 2014, at 3:06 am, stan levandowski <sjl219 at optonline.net> wrote:
> 
> I just got a KXPA100 yesterday.  It seems to work as specified except that above 10 watts of power, the KX3 display randomly {like in "not all the time"} shows two dashes instead of the SWR. 
> 
> I do not have the internal tuner option.  I am using my SGC237 autocoupler into a center fed Zepp.  My W2 wattmeter shows the proper power output and the SWR  is usually 1:1 or very close.
> 
> This does not occur at power levels at or below 10 watts which means it's most likely not the KX3's problem but rather the amplifier's behavior.
> 
> Happens on different bands and frequencies.  If this is documented somewhere then I've missed it.
> 
> 73, Stan WB2LQF
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