Cobra 25ltd st

For discussions on CB Radio Repair and Troubleshooting, do not post modification requests here, use the Modifications forum !
Post Reply
SinStp
Dead Key
Dead Key
Posts: 27
Joined: Tuesday 19th Aug 2008, 18:06
Location: Oklahoma

Cobra 25ltd st

Post by SinStp »

Curious if anyone knows what L20 adjusts or could tell me where to find what it adjusts on Cobra 25 LTD soundtracker , manufactured in may 97. Its the tuning can right next to pa/ext speaker jacks. Long story short i left it open and my very helpful son turned it all they way in. Recieves and transmits fine just not sure what it does and its driving me nuts. Thanks, Mike
User avatar
The Defpom
Site Admin
Site Admin
Posts: 436
Joined: Friday 20th Aug 2004, 18:06
Location: New Zealand
Contact:

Re: Cobra 25ltd st

Post by The Defpom »

L20 is the 54MHz filter, it is tuned to limit RF output on 54MHz (1st harmonic), you need a spectrum analyser to adjust it properly.

Your probably best to just adjust it back to about 3/4 (towards the top), that should at least be approximately correct, certainly closer than where it is now.
SinStp
Dead Key
Dead Key
Posts: 27
Joined: Tuesday 19th Aug 2008, 18:06
Location: Oklahoma

Re: Cobra 25ltd st

Post by SinStp »

Thank you sir , thats what I'll do. Thanks for the response.
Post Reply