Joe,
If you are using the Front Panel adapter for the ProSet-Ic, try plugging
the microphone into the MIC jack in the back of the K3 and changing the
MIC SEL menu to the rear panel.
If the hum is not present, then you have a bad adapter instead of a bad mic.
73,
Don W3FPR
On 12/4/2018 10:32 AM, Joe Rogers wrote:
Hi Don,
Thanks for the email suggestions.
I ran some on air checks of the Proset and the other mike I have - a Gold
Elite. Gold Elite audio was fine. Proset was poor. Believe it is the open
microphone ground lead problem that you mentioned.
Thanks,
73
Joe AJ1Y
-----Original Message-----
From: Don Wilhelm <[email protected]>
Sent: Monday, December 3, 2018 19:44
To: Joe Rogers <[email protected]>; [email protected]
Subject: Re: [Elecraft] [K3] - Hum on SSB Transmissions
Joe,
Do you hear that hum when you operate into a dummy load? If not, then check
the common mode choke on the antenna, you are likely getting RF-In-the-Shack
from the antenna - the fact that it diminishes when you put your hand on the K3
amplifies that this may be the problem. Forget about grounding the radio for
this problem, solve it at the antenna feedpoint with a good common mode choke
on the feedline.
Other possibilities are power supply ripple (run it on battery to check) or an
open microphone ground lead (try other microphones).
Make sure the rear panel jacks are fully plugged (give them an extra push).
73,
Don W3FPR
On 12/2/2018 4:17 PM, Joe Rogers wrote:
I normally operate CW but the other day and have not been SSB for a few weeks
to a month. Yesterday, I was getting ready to operate SSB and I noted a hum
through the monitor when I key the transmitter. By way of background, K3 is
2012 vintage and I assembled the kit. No problems with until this one. I have
found several similar threads mentioning a hum on SSB transmit but of the
mentioned solutions worked to solve my problem.
I have Heil Pro set IC and Heil Gold Elite. The problem seems much more
pronounced with Proset IC.
Whether it is connected to front panel (FP.H or RP.H Bias on) makes no
difference. If I used PTT or VOX it is there. Set Mic Gain at anything above
zero it starts. With higher mic gain and higher compression it is worse. I
have made some PSK contacts using the LIN IN input and seems to work OK.
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