[Elecraft] KAT-100

[KJ3D]

Hi Don and Jim,

Thanks for taking the time to respond.  

The KPA100 will be internal and the KAT100 will be in an EC1.

After re-reading the manuals for the KPA and KAT 100's, maybe this isn't so
hard.  

I think that I can connect my secondary supply directly to the K2 and then
power the KAT100 via a switch to select either the main or secondary
supplies while main/secondary power to the K2 would be automatically
switched from main to secondary if the Astron fails.

Does this sound reasonable or am I missing something else?  

Thanks, 

Tom
 

-----Original Message-----
From: Don Wilhelm [mailto:w3fpr at earthlink.net] 
Sent: Saturday, April 21, 2007 8:05 AM
To: KJ3D
Cc: Elecraft at mailman.qth.net
Subject: Re: [Elecraft] KAT-100

TRUE to all your T/F questions.

To answer the REAL question, yes the KPA100 will go into bypass if power is
removed from it.  The KAT100 does present a problem if it is powered from
the same supply as the KPA100 and that supply fails or is switched off
because the KAT100 does not use latching relays - with power off it will
revert to all capacitors disconnected and all inductors bypassed and ANT 1
will be selected.  In other words, the K2 output will be connected to
whatever SWR your antenna presents without the tuner in-line.

The KAT100 and base K2 SHOULD continue to work seamlessly at lower power if
you power them both from the low current power supply, but I have not really
tried that scenario.

73,
Don W3FPR

KJ3D wrote:
> Good Morning Group,
> 
> I'm beginning the KPA100 and KAT100 build this weekend and have some 
> questions.
> 
> True or False:  I must run two power lines from my Astron 35, one to 
> the KPA100 and another to the KAT100.
> 
> True or False:  I MAY connect a secondary power supply (turned off) to 
> the barrel connector on the K2 in case the Astron fails.
> 
> True or False:  If the Astron fails, the K2 will go into bypass mode 
> and continue to work at QRP levels if I then turn on the secondary power
supply.
> 
> REAL QUESTION:  	If the K2 is running in the bypass mode, will the
> KAT100 then take power from the secondary power supply?
> 
> 
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