Ts-2000 and the KPA

[Jerry]

 

Greetings:

 

My K3 is on its way back to Elecraft for some needed repairs. So I have
placed my TS2000 into temporary duty. I have hooked it up to the KPA500 and
the KAT500 and it works very well in the transmitting mode. The problem
arises when I am in receive. If the KPA500 is in the STBY mode, receiving is
not inhibited at all (I get everything noise and all). When I place the
KPA500 into OPER (full power), the receive signal is  attenuated down about
20db. Great for reducing noise, but not so good on that rare dx station.
This same condition persists when I take the KAT500 out of line. Am I
missing something in the setup when I connected the TS-2000? I do have a
recording of the differences between the two settings and it is certainly
available to anyone who would like it to analyze. Just let me know off
reflector and I will send it to you.

 

Best regards,

 

Jerry, W1IE

 

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[Dick Dievendorff-4]

Could you have the KPA500 key line pulled low when receiving?  That would
activate its T/R switch (even during receive).

Try temporarily removing the PTT key line RCA connector from the back of the
KPA500 to see if the signal improves. If it does, try to figure out why it's
shorted during receive.

Perhaps it's plugged into the wrong connector on the back of your TS2000?  

Good hunting!

73 de Dick, K6KR


-----Original Message-----
From: Elecraft [mailto:[hidden email]] On Behalf Of Jerry
Sent: Saturday, September 06, 2014 4:18 AM
To: [hidden email]
Subject: [Elecraft] Ts-2000 and the KPA

 

Greetings:

 

My K3 is on its way back to Elecraft for some needed repairs. So I have
placed my TS2000 into temporary duty. I have hooked it up to the KPA500 and
the KAT500 and it works very well in the transmitting mode. The problem
arises when I am in receive. If the KPA500 is in the STBY mode, receiving is
not inhibited at all (I get everything noise and all). When I place the
KPA500 into OPER (full power), the receive signal is  attenuated down about
20db. Great for reducing noise, but not so good on that rare dx station.
This same condition persists when I take the KAT500 out of line. Am I
missing something in the setup when I connected the TS-2000? I do have a
recording of the differences between the two settings and it is certainly
available to anyone who would like it to analyze. Just let me know off
reflector and I will send it to you.

 

Best regards,

 

Jerry, W1IE

 

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[Phil Salas]

You should be keying the KPA with the REMOTE connector on the TS-2000 where REMOTE Pin 2 and Pin 4 are the contacts that short together to key the amp.  I normally also ground pin 2, and use Pin 4 as the amp-key output.  There is also a solid-state output (Pin 7 and ground), but this has the opposite sense of what is needed.  I.e., it puts out 12V on TX and 0V on receive.

Phil – AD5X
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