[Elecraft] Adjusting power level that KPA100 kicks in at...

[Don Brown]

Hi

The KPA100 kicks in at 11 watts and higher. Below that the amp is bypasse=
d except for the low pass filters on the KPA100. You should have no probl=
em running digital modes a 5 watts. But if you want to run higher power y=
ou should set the power above 11 watts to turn on the PA. There is not a =
menu setting to adjust the turn on point of the PA. The PA operates at a =
fixed gain and the power is adjusted by ALC action the same way the base =
K2 operates. The K2 PA transistors only need to provide a few watts to dr=
ive the KPA100.

Don Brown
KD5NDB =20

----- Original Message -----
From: John Clifford
Sent: Thursday, October 17, 2002 2:02 AM
To: elecraft@mailman.qth.net
Subject: [Elecraft] Adjusting power level that KPA100 kicks in at...

Greetings,

From reading the manual, it looks as if the K2's ordinary (QRP) PA
transistors are used from 0.1 watts up to 10 watts when the KPA100 is
attached.  Is this true, and if so can this be changed so that if the KPA=
100
is attached the 'switchover' point can be set via menu to a lower power?

I ask this because I'd like to be able to run 5w PSK31 or other high duty
cycle mode without having to worry about my K2 PA transistors.

Also, once in QRO mode, does the K2's QRP PA section stay at 10w
steady-state while the gain in the KPA100 is adjusted to provide the
additional power?

Thanks,

- jgc

John Clifford KD7KGX

Heathkit HW-9 WARC/HFT-9/HM-9
Elecraft K2 #1678 /KSB2/KIO2/KBT2/KAT2/KNB2/KAF2/KPA100
Ten-Tec Omni VI/Opt1


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