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

[stan levandowski]

Dick and Matt, thanks for the responses.  Now I'm better informed which 
is always a good thing!
Have a pleasant Thanksgiving, folks.
 
I must say that the level of integration between the KX3 and the KXPA100 
is simply stunning!  


As a dedicated QRP op for over half a century it was very difficult for 
me to make this purchase just on general principles.  I finally bought 
it to help the OTHER guy out during long ragchews, not for myself.  I'm 
a very charitable guy.....


73, Stan WB2LQF




On Fri, Nov 21, 2014 at 03:01 PM, Dick Dievendorff wrote:

> Sorry Matt, this isn't quite right.
>
> The KXPA100's SWR bridge is on its LPF board, and is part of all 
> KXPA100's,
> with or without the  KXAT100 Antenna Tuner Option.
>
> The KX3 currently doesn't display the KXPA100's SWR, it instead 
> displays the
> KX3 SWR measurement.
> When the KXPA100 is PA Bypassed (under about 10 watts), the KX3 SWR 
> bridge
> sees the antenna impedance, so the SWR display is appropriate. 
> However when
> the KXPA100 is not bypassed, the KX3 SWR display is of the input of 
> the
> KXPA100.
>
> Wayne has on his KX3 firmware "todo" list a task to display KXPA100 
> SWR on
> the KX3 display when appropriate.
>
> The KX3 displays dashes when its power is too low for an accurate SWR
> measurement.
>
> The KXPA100's view of the antenna system SWR can be displayed with the
> KXPA100 Utility Operate Page, LEDs on an KXAT100-equipped KXPA100, or 
> an
> external SWR meter like our W2.
>
> 73, Dick, K6KR
>
>
> -----Original Message-----
> From: Elecraft [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of 
> Matt
> VK2RQ
> Sent: Friday, November 21, 2014 11:36 AM
> To: stan levandowski
> Cc: Elecraft
> Subject: Re: [Elecraft] KX3 - SWR Display of "--"
>
> 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  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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