[Elecraft] KE7X KX3 Book and Configuring: KX3, K3, KPA500, and KAT500

Tue Apr 22 20:07:27 EDT 2014

Hi Phil:

too bad I didn't jump on it.
i didn't realize it had the subreceiver !!!

73,
Larry

Phil Hystad-3 [via Elecraft] wrote:
> Don,
>
> OK, I may be expecting too much.  Actually, I am not sure if I was 
> expecting as much as I was a little bit surprised by the behavior.  I 
> didn't think that the KPA500 and KX3 communicated with each other 
> other than RF and Key line but maybe that was enough of a difference 
> from the K3.  The K3 of course in my case has the AUX cable 
> connections with the KPA500 and KAT500.
>
> It is not a big deal as long as this is the way it is expected to 
> work.  I was not sure if I had done something wrong or not.
>
> But, just picked up W1AW/5 MS QRP power with the KX3.  Actually, it 
> was about 6 watts.  
>
> 73, phil, K7PEH
>
>
> On Apr 22, 2014, at 4:57 PM, Don Wilhelm <[hidden email] 
> </user/SendEmail.jtp?type=node&node=7587681&i=0>> wrote:
>
> > Phil,
> >
> > I think you may be expecting too much.
> > Consider a parallel - a computer communicating with a printer.  If 
> you suddenly switch the printer cable to another computer, would you 
> expect the printer to continue printing without any intervention?
> >
> > The "printer" in this comparison is the KPA500 and the two 
> "computers" are the K3 and the KX3.
> >
> > It is not unreasonable IMHO to expect that a reset of the KPA500 
> would be required.
> >
> > If the KPA500 were simply an amplifier with no communications 
> capability with the driving transceiver, switching from one source of 
> RF input to another should proceed without regard to whatever is the 
> driving device, but your KPA500 is more than "just an amplifier" 
> because it can communicate with the K3 or KX3 driving transceiver. 
> Expecting the KPA500 to switch data streams from two different 
> transceivers with no intervening reset is not realistic.
> >
> > 73,
> > Don W3FPR
> >
> > On 4/22/2014 7:41 PM, Phil Hystad wrote:
> >> So, is this normal behavior?  I wasn't expecting any kind of comms 
> between the K3 and the KPA500 that affects the STBY/OPER switching. 
>  It does seem that a power on/off cycle for the KPA500 is required to 
> enable that switch.
> >>
> >> Is this designed to work this way or is this a flaw in the design 
> or maybe a missing mini-feature of configuring two different 
> transceivers with the KPA500.  I admit to not scouring all of the 
> documentation yet on the expected functionality of the STBY/OPER switch.
> >>
> >> 73, phil, K7PEH
> >>
> >>
> >> On Apr 22, 2014, at 4:14 PM, Don Wilhelm <[hidden email] 
> </user/SendEmail.jtp?type=node&node=7587681&i=1>> wrote:
> >>
> >>> Phil,
> >>>
> >>> Let me get this straight - the KPA500 is communicating with the 
> K3, then you switch to the KX3 and the KPA500 does not talk with the KX3.
> >>>
> >>> If that is what is happening, I would expect that to be the case. 
> The communications with the K3 is not synchronized with the attempted 
> communications with the KX3, so a reset (power cycle) of the KPA500 
> may be required.
> >>>
> >>> 73,
> >>> Don W3FPR
> >>>
> >>> On 4/22/2014 7:02 PM, Phil Hystad wrote:
> >>>> Some follow-up questions:
> >>>>
> >>>> OK, I have the KX3 and K3 configured with the KPA500 and KAT500. 
>  Everything seems to work with one little exception.
> >>>>
> >>>> The exception:
> >>>>
> >>>>     --- initial conditions, K3 is on and switched to use the 
> KPA500 and KAT500.  KX3 is off.
> >>>>
> >>>>     --- using K3 and so on works fine with amp on or with amp in 
> standby.
> >>>>
> >>>>     --- I turn off K3.  Leave KPA500 on but in STBY mode.
> >>>>
> >>>>     --- Switch coax from K3 to KX3 (1x2 switch).
> >>>>
> >>>>     --- Turn on KX3.  KPA500 still in STBY mode.
> >>>>
> >>>>     --- Attempt to switch KPA500 to OPER from STBY but switch 
> does not work.  If I power off the
> >>>>          KPA500 (front panel switch) and power back on then 
> switch works fine.
> >>>>
> >>>> I have experimented with all kinds of starting initial conditions 
> and order of events but whenever
> >>>> the KPA500 is left on after using the K3 and then switching to 
> the KX3, the switch on the KPA500
> >>>> to go from STBY to OPER does not work.  I always have to cycle 
> the power from the front panel on/off
> >>>> switch.
> >>>>
> >>>>
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