This sounds like the same I'm trying to cure here also.
I did have FM-ing on 80 with dummy , but not with antenna.
My antenna is groundmounted and with radials so it's grounded.
What happens if u try the antenna with ground?
And if u set power to 50 watt on 80 meter and switch to 40 and wistle high
tone/pitch in the mic , does your power go way up then?
I have a problem where the K2/100 forget powersetting and want regulate down
on it self.
This happens partly on 80 also.
But a low wistle in the mic in same time as I regulate down power does work
and it stays there until I change band again.
Can you try that?
I'm interested to hear if you have same symptom?
Good luck!
73 Tom LA1PHA
----- Original Message -----
From: "Don Ehrlich" <[EMAIL PROTECTED]>
To: <[email protected]>; <[EMAIL PROTECTED]>
Sent: Thursday, October 28, 2004 6:27 PM
Subject: [Elecraft] K2 FM-ing on 80 Meters
My just completed #4438 with SSB, DSP, 160M, and 100Watt Modules seems to
be working just fine .... except:
.. on the low end of 80 meters (3500-3700 approximatly) the signal sounds
like there is a 'ringing' on it when listening to another receiver in the
shack. This happens only at power levels above about 50 watts and only on
the low end of 80 meters.
Here is what I have done:
Replaced my power supply with a large lead-acid car battery to eliminate
any possibility of interaction with the power supply. Results the same
with either power source.
Tried two different monitoring receivers ... same results with each.
I am using a 50 ohm dummy load (Heath Cantenna).
This is what I see:
A scope looking at the RF waveform shows NO am modulation. The envelope
is clean.
A scope looking at the RF waveform does show a slight blurriness in the
horizontal axis indicating rapid but slight frequency shift.
A scope monitoring the 12 volt input shows a small sinusoid waveform on
the 12 volt input (a hundred mV or so) indicating that there is a
significant AC component of current being drawn from the battery. The
frequency of this AC component of input current is about 30 hertz.
I suspect ALC instability of some kind. I could sure use some help here.
Don K7FJ
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