Posted by
jperelst on
Apr 29, 2010; 1:15am
URL: http://elecraft.85.s1.nabble.com/K2-PSK-31-Power-Settings-tp4975238p4977865.html
Don,
I'm having trouble with this approach on 40 meters.
I set the power on the K2 to 30 watts and then adjusted
the TX volume on the SignaLink as high as I could without getting any ALC reading.
When I do that, I essentially have zero power output. There's no deflection on the
K2's RF meter and someone who was monitoring my signal said that my signal just dropped off the waterfall. I have a KAT100 and with these settings the SWR light would not light, indicating that there isn't even enough power out for the KAT100 to measure SWR).
When I increased the SignaLink TX volume to get a 30 watt reading on the K2's RF indicator, I was getting 2-4 bars of ALC.
On my FT-897, the power display when I'm transmitting PSK is fairly steady. On the K2 on 40 meters, it was bouncing all over the place, but that may be a function of how the K2 measures RF power out??
I had no trouble using the suggested technique on 20 meters.
Any ideas as to why I'm having problems on 40?
Jon
KB1QBZ
I had no problem using this approach on 20 meters, so I'
--- On Wed, 4/28/10, Don Wilhelm <
[hidden email]> wrote:
I would recommend setting the power to 30 watts. Then hold DISPLAY to change the metering to ALC - adjust the audio up just to the point where there is no ALC indication (adjust until you see ALC bars and then back off until there are none). That should give you a cleaner signal and better control of the output level. Since the gain of the K2 transmit chain varies from band to band, you may have to check the audio drive level again when changing to a different band. For further explanation, read on.
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