Go Back   WorldwideDX Amateur Radio Forums > Citizens Band Related > General CB Services Discussion

Amateur Callsign Lookup
Enter Callsign:

Cobra 139xlr help!

LinkBack Thread Tools Display Modes
Old 03-12-2012, 05:00 PM
Junior Member
iTrader: (0)
Join Date: Apr 2011
Posts: 10
CherokeeKidd is on a distinguished road
Default Cobra 139xlr help!

Got it cheap and the Rx is working fine but when keyed there is no AM power at all but the radios meter shows modulation. SSB has less than half a watt out and no modulation. the d179 cap was burnt to a crisp and i replaced it with the 2.2uF 24v cap and still same problem. I checked the pre driver, driver, and final with a mm and all three are getting next to nothing, with the pre driver getting the most but when keyed the voltage just drops off. When I tried to bias the driver and final the numbers just kept dropping when on the key not allowing me to bias them right. everything else looks good but i dont know where to go form here. Im not the best at soldering but can do it if it really needs it so id like to narrow down the problem before I go butchering it. thanks in advance!

Reply With Quote
Old 03-22-2012, 01:38 PM
southerntrucker's Avatar
rebel child
iTrader: (0)
Join Date: Jan 2012
Location: texas, the good ole south
Posts: 80
southerntrucker is on a distinguished road

mine had te same problem. i just replaced the 1306 final with a 1968 and it went back workin to normal.
Loaded like a train, dispatched like a plane. Flyin low, in the left lane.

Reply With Quote

Worldwide Radio Forum

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
COBRA 148 GTL Review Robb CB Band and CB Radios 47 11-12-2013 05:04 AM
Cobra 148GTL VS. Galaxy DX-949 CTStallion CB Band and CB Radios 51 08-20-2012 11:37 PM
thinkin about sellin my cobra 139xlr southerntrucker CB Radio Gear SwapShop 4 03-08-2012 01:24 PM
cobra 139xlr receive issues redbull General CB Services Discussion 3 03-06-2010 08:16 PM
Cobra 139xlr good power out but no mod. KB1TPX General CB Services Discussion 17 07-28-2009 01:02 PM

All times are GMT -7. The time now is 01:20 AM.

Powered by vBulletin®
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Search Engine Optimization by vBSEO 3.6.0
Worldwide Radio Forum