I run JT9 and JT65 very frequently with the K2/100. Most of the time, I
run 5 watts. If needed I'll crank it up to 20 watts, so I can assure you
it's quite safe at that power level.
When the linear kicks in the K2 drive power to the linearis
proportional, so if you are within the duty cycle of the linear, you are
within the duty cycle of the K2 barefoot.
At 20 watts the fan usually comes on after about 30 seconds of TX and
stays on for the remainder of the TX cycle and much of the RX cycle. At
around 25-30 watts, the fan is on all the time, but I don't ever run it
that high. The JT modes are meant for weak signals so I only work weak
signals and find that at 15-20 watts I'm giving very close to the same
signal report I receive.
For PSK, I stick to the same power levels as JT modes. I don't run PSK
very often because it's not as interesting to me. I lost patience with
brag tapes in the RTTY days. Now they provide model numbers of every
rig, every radio accessory and every computer specification including
version numbers of software even if they aren't using that gear for the
QSO. Sort of a shopping list for burglars.
The K2 does a very nice job with all the digital modes.
Eric
KE6US
On 12/26/2013 9:06 AM, K1FFX wrote:
I starting to use my K2/100 in two 100% key-down modes, JT-65 and PSK-31.
What
should I be keeping in mind in protecting the output stage for the K2 and
for the KPA100?
For JT-65, since it is a QRP mode, I'm running at about 5 watts, and
transmissions are
limited to about 45 seconds. So, I'm hoping that K2's output transistors
will not be stressed
in this mode.
But, how about PSK-31? I'd like to run about 20 watts and each transmission
could easily
be 3 or so minutes. I don't know at what output power the base K2 runs when
the KPA100
kicks in (i.e., at above 10 watts). I assume that normally the KPA100 will
be loafing at 20
watts, but I'm not sure the impact of 100% key down on its output stage.
I'd appreciate any guidance in keeping the K2/100 "safe" in these modes.
Thanks -
Bruce K1FFX
-----
Bruce Rosen
K1FFX
K2/100 6982 KSB2 KAT100-1
--
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