| Author |
Message |
    
Co1maine
New member
Username: Co1maine
Post Number: 1
Registered: 11-2011
| | Posted on Monday, November 28, 2011 - 6:43 am: | 
|
Which crystal/crystals do I need to swap out to change freq on this radio? I have a crystal box coming and want to keep the current 23 channels and add the crystals to get to 40ish.
I know there are two sets of mixers, but can I just change the carrier oscillator freq (7.8025)easily? |
Scrapiron63
Advanced Member
Username: Scrapiron63
Post Number: 892
Registered: 12-2001
| | Posted on Monday, November 28, 2011 - 10:20 am: |
|
I believe you will have to work with the 8 meg crystals in that radio to add channels, And you will just get 4 new channels for each new crystal. The reason is the way it mixes for sideband. Of course if you've got a 7 meg crystal a little different from the original it sure wouldn't hurt to try it.
The Cobra 132 & 135 had a 12.800 crystal that could be swapped and get 23 new channels but they were set up different. Good luck with your project.
Scrapiron
CEF 108 |
Crazybob
New member
Username: Crazybob
Post Number: 8
Registered: 12-2005
| | Posted on Friday, December 09, 2011 - 1:42 am: |
|
I got the clairafier to swing 10 kc's down by turning one adjustment on my Cobra 138. A very heavy Japan made radio! |
