Just installed the Power Amplifier two days ago and I’ve
got severe noise on the transmit audio. As far as I could tell, transmit audio
sounded clean before the PA install (talked across town to a fellow ham). I’m
using a Heil dynamic element (HC-4) microphone with transmit audio going to pin
1, and using pin 7 for microphone ground. Mic and Comp gain at 20-30,Some buzz
may be due to slight RFI but what I’m hearing seems much more than that.
The radio is bonded to a good station ground.
Current Symptoms:
I have a rumble/buzz superimposed on the microphone audio.
This extra signal varies from light to severe as power is increased, and
distorts the transmit audio. As an added bonus, it sounds like there is a buzz
superimposed on my CW signal at 18 MHz and above. All this as observed while
transmitting to 50-ohm dummy load, with monitoring on a nearby, separate
receiver (IC756ProII). If I use the K3 as an exciter to an outboard amplifier (Ameritron
AL-80B) I can actually transmit at 100W PEP with only a little bit of hum in
the background, which you really have to strain to hear.
I’ll take the transceiver off-line after the weekend
testing (giving out QSOs for CQP) but would appreciate any unofficial help inputs
from this experience pool and official K3 support J
73 Rick N6CY
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