| Author |
Message |
    
Rchieroma
New member
Username: Rchieroma
Post Number: 1
Registered: 5-2009
| | Posted on Saturday, October 04, 2014 - 12:45 pm: | 
|
HI,
I just received my JCD-201M from copper and I can't get it to stop squealing when transmitting on my 2970. I noticed if I turn the volume way down on the radio the mic will stop squealing, My audio is very low and the radio is barely being driven. If i put my finger on the metal volume knob the squealing will go away. I'm assuming this is a ground issue? Any help on how to remedy this problem is much appreciated. Thanks 73's Rich |
Moonraker
Intermediate Member
Username: Moonraker
Post Number: 318
Registered: 3-2005
| | Posted on Saturday, October 04, 2014 - 6:34 pm: |
|
Sounds like you've got some stray RF in the shack. Some power mics are very sensitive to that. Maybe some bad coax or the antenna isn't up to snuff. I don't know what you have for an antenna but common mode current may be the culprit. The coax shield can radiate and bring RF into the shack. Can you give some more detail on the antenna you're using? |
Rchieroma
New member
Username: Rchieroma
Post Number: 2
Registered: 5-2009
| | Posted on Saturday, October 04, 2014 - 10:45 pm: |
|
Hi Moonraker,
I'm using a grounded antron 99 and LMR400 coax. All my other amplified mic's work perfect. It just seems to be this one. Thanks 73's Rich |
Dale
Senior Member
Username: Dale
Post Number: 2119
Registered: 12-2002
| | Posted on Sunday, October 05, 2014 - 5:07 pm: |
|
how do you got the mic setup?
what mode/s
is the mode selector right for mode used?
cpmpression on/off
need more info on how running mic shouldnt have to run mic gain down in radio to point where you have little audio
dale/a.k.a.hotrod
cef426
cvc#64
454 [dx numbers]
38lsb
|
Rchieroma
New member
Username: Rchieroma
Post Number: 3
Registered: 5-2009
| | Posted on Monday, October 06, 2014 - 10:28 am: |
|
Hi Dale,
I've tried the mic in all modes. The only mode it doesn't squeal in is Manual with the gain down very low and the radio gain down low. I'm thinking it's a wiring issue. Copper wired the mic but I think maybe they missed a ground. if anyone has the wiring diagram I'd be very grateful. Thanks 73's Rich |
Dale
Senior Member
Username: Dale
Post Number: 2121
Registered: 12-2002
| | Posted on Tuesday, October 07, 2014 - 3:58 pm: |
|
go to product reviews on this fourm theres a complete review with wiring diagram. i only
mentioned the modes cause you gotta use ssb
mode on mic when radio is in ssb mode.and of course am mode when radio in am mode. im sure you know this already just tring to help
dale/a.k.a.hotrod
cef426
cvc#64
454 [dx numbers]
38lsb
|
Rchieroma
New member
Username: Rchieroma
Post Number: 4
Registered: 5-2009
| | Posted on Wednesday, October 08, 2014 - 3:24 pm: |
|
I appreciate Your help Dale, I read the review and have the microphone wired correctly. I'm thinking about grounding the mic to the radio next and see if that eliminates the squeal. Thanks everyone for the suggestions 73's Rich |
