Copper Talk » Ask The Tech » Radio's Mobile » 949 Bias « Previous Next »

Author Message
Top of pagePrevious messageNext messageBottom of page Link to this message

Trouthunter31
New member
Username: Trouthunter31

Post Number: 8
Registered: 11-2007


Posted on Sunday, February 03, 2008 - 2:19 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)
I tried adjusting my bias as directed in the service manual.

Set radio to CH 19 USB TX mode. MOD off.

Connect current meter to TP7(+) and TP9(-) VR12 50 mA
Connect current meter to TP7(+) and TP8(-) VR10 100 mA

My issue is I can only get about 16 MA out of this adjustment. Is it my meter has the wrong scale or do I need to swap some parts out to adjust properly. The only mod I have done to this radio is the swing mod where you add the diode to the resister.
Trouthunter

Fly Fishing Is my Relaxation
Top of pagePrevious messageNext messageBottom of page Link to this message

Bret
New member
Username: Bret

Post Number: 1
Registered: 12-2010
Posted on Thursday, January 06, 2011 - 5:45 am:   Edit Post Delete Post    Move Post (Moderator/Admin Only)
I have the exact same problem with my refurbished (unmolested) 949. The driver can be set at 50mA, but I only get around 12mA when trying to adjust the final with VR10. Is it possible there is a misprint in the factory service manual? Is this information even any good for the mosfet version that I have? The only reason I even tried to adjust the bias is the driver fet is making the back of the radio too hot to touch after a short key up (with no modulation.. am or ssb). I wonder why this question has remained unanswered for so long? Please help. I would rather fix this myself than send it back to Galaxy after having it for two whole days.

Add Your Message Here
Post:
Username: Posting Information:
This is a private posting area. Only registered users and moderators may post messages here.
Password:
Options: Enable HTML code in message
Automatically activate URLs in message
Action: