K2 and 30L1

[syd smith]

 

Darned if I can find the "sink" specifications of the PA KEY OUT ... so I brewed up an external T-R relay.  Better safe than sorry.  Anyone directly switching a Collins 30L-1?

 

Then I fired up the amp and tuned the 30L-1 with low power out from the K2;  but when I advanced the K2 to about 20 watts out, the plate current of the 30L-1 zipped up to 800 MA.....yeow, the 811s wont last long at that rate.  Now I know their has to be a lot of people using this combination of equipment ... any comments?  

 

I noticed the swr was high at 1.8:1 so the tuned input circuits of the 30L1 needs tweaking;  and of course, the ALC is open.  The 30L-1 works fine with my S-Line by the way.

 

Syd - WB4W

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[Guy, K2AV]

I can't locate it but I remember something about length of the cable from
the driving rig to the 30L1.  It should be short. Also if the 30L1 is acting
squirrely, you should not be driving the 30L1 through the ATU assuming your
K2 installation has it. You may also have a problem with the 811A's if at
one time the input SWR was lower.

As to keying the transmit relay circuit in an unmodified 30L1, that amp
has -170 volts on that lead, you are keying cutoff bias. A relay closure or
a transistor keying interface circuit built specifically for that high
negative voltage is required.

73, Guy.

----- Original Message -----
From: "syd smith" <[hidden email]>
To: <[hidden email]>
Sent: Saturday, March 14, 2009 2:20 PM
Subject: [Elecraft] K2 and 30L1





Darned if I can find the "sink" specifications of the PA KEY OUT ... so I
brewed up an external T-R relay.  Better safe than sorry.  Anyone directly
switching a Collins 30L-1?



Then I fired up the amp and tuned the 30L-1 with low power out from the K2;
but when I advanced the K2 to about 20 watts out, the plate current of the
30L-1 zipped up to 800 MA.....yeow, the 811s wont last long at that rate.
Now I know their has to be a lot of people using this combination of
equipment ... any comments?



I noticed the swr was high at 1.8:1 so the tuned input circuits of the 30L1
needs tweaking;  and of course, the ALC is open.  The 30L-1 works fine with
my S-Line by the way.



Syd - WB4W

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Help: http://mailman.qth.net/mmfaq.htm
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