Copper Talk » Ask The Tech » Radio's Mobile » Archived Messages » Cobra 148 NW ST No TX AM or SSB « Previous Next »

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

Blue_streak
New member
Username: Blue_streak

Post Number: 2
Registered: 1-2002
Posted on Saturday, March 05, 2005 - 7:38 am:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Hello,

I have a Cobra 148 NWST but there is no tx. I used to have this unit installed in my truck and I believe the connection at the ant. was the demise of this radio. Got all corroded. Any information on how to fix would be helpful along with parts needed. Or would I be better to send to someone for repair.

Thanks
Blue Streak
Top of pagePrevious messageNext messageBottom of page Link to this message

Sonoma
Intermediate Member
Username: Sonoma

Post Number: 179
Registered: 11-2001
Posted on Saturday, March 05, 2005 - 8:29 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

More than likely you blew the final.
Top of pagePrevious messageNext messageBottom of page Link to this message

Blue_streak
New member
Username: Blue_streak

Post Number: 3
Registered: 1-2002
Posted on Sunday, March 06, 2005 - 7:17 am:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

I kinda figured that, anyone know where I can get them to replace them?
Top of pagePrevious messageNext messageBottom of page Link to this message

Blue_streak
New member
Username: Blue_streak

Post Number: 4
Registered: 1-2002
Posted on Monday, March 07, 2005 - 7:59 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Well, crossed the # over to an ECG236 Transistior, put it in, now have tx back but only putting out a little over 1 watt. Should radio have to be "re-tuned" for that final? or should I have went with the 2sc1969 one that is shown in the schematic fo rthe 148 gtl st? Or is there possibly something else wrong also. Any help will be appreciated. Also, that I know of it is a stock radio no mods
Top of pagePrevious messageNext messageBottom of page Link to this message

Chad
Intermediate Member
Username: Chad

Post Number: 185
Registered: 11-2004


Posted on Tuesday, March 08, 2005 - 9:04 am:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Try the original part number. NTE, ECG, Etcetera are cross references that will work, but sometimes not perfectly. I always try to go back to original parts unless they are now comprised of unobtanium. Also check the bias supply and drive circuitry, If a transistor shorts sometimes it takes these out too.

Good Luck!
Chad

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: