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Hdluvbugs
New member
Username: Hdluvbugs
Post Number: 6
Registered: 12-2004
| | Posted on Saturday, January 22, 2005 - 9:51 am: | 
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I have read a lot of the post on tis radio. I have a old one O got it in 1992. i want to tune can some one give me thee vr locations for power, dead kee , mod-swing? |
Tech808
Moderator
Username: Tech808
Post Number: 4594
Registered: 8-2002
| | Posted on Saturday, January 22, 2005 - 10:27 am: |
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Hdluvbugs,
Look to the left of the Forum here and you will see:
Tools
Mic. Wiring
Frequency Chart
CB & Ham Lingo
Modification List
#1 ~ Click on Modification List,
#2 ~ Then under Make scroll down until you see: Cobra and Click on it.
#3 ~ Then under Model scroll down until you see: 148 and click on it and then pick the Model of 148 you have.
Hope this helps,
Lon
Tech808
CEF808
N9OSN
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Musket
New member
Username: Musket
Post Number: 2
Registered: 12-2004
| | Posted on Thursday, March 17, 2005 - 6:34 pm: |
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What crystal do i need to add to get 40 more channels upper 27.415 to 27.855 148 GTL classic 5 pin side mount mike has 11.3258 in it? Just want the radio to go from 26.965 to 27.855 80 channels total.. |
Bc910
Intermediate Member
Username: Bc910
Post Number: 463
Registered: 7-2004
| | Posted on Thursday, March 17, 2005 - 11:16 pm: |
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I may be wrong but my understanding is + or - .40 for upper or lower channels
so 27.415-27.855 would be an 11.7258 crystal etc.
But why?
The 148 uses the MB8719 chip which can cover those freqs plus with out a crystal switch!
BC |
Bulldog369
Intermediate Member
Username: Bulldog369
Post Number: 251
Registered: 2-2004
| | Posted on Friday, March 18, 2005 - 6:11 am: |
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MAYBE WRONG BUT WHEN I DID MY 142 MOD, I HAD TO CHANGE THE CRYSTAL & THAT HAD THE 8719 IN IT.. THINK I HAD TO USE A 10.?? CRYSTAL.. |
Scrapiron63
Advanced Member
Username: Scrapiron63
Post Number: 784
Registered: 12-2001
| | Posted on Friday, March 18, 2005 - 8:48 am: |
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I believe those radios use a tripler, so for 40 channels up you would need a 11.4758 crystal.
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Bc910
Intermediate Member
Username: Bc910
Post Number: 471
Registered: 7-2004
| | Posted on Friday, March 18, 2005 - 10:45 am: |
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Bulldog,
Yes the 142's need a crystal change first, why I dont know...
The 148's use the same pll and dont at least not the ones I've modded
BC |
Kid_vicious
Intermediate Member
Username: Kid_vicious
Post Number: 290
Registered: 9-2004
| | Posted on Sunday, March 20, 2005 - 1:36 am: |
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the reason that the 142 needs the xtal change is because of the way the n-codes are set up. the most significant pin is pin 10. changing the logic of this pin will cause the radio to jump 64 channels. in the 142gtl, the radio will jump down 64 channels, in the 148gtl, it will jump up 64 channels. you must first change the xtal in the 142 to get the upper channels, so that the new xtal is for the upper channels, and switching pin 10 creates the jump down to the regular 40.
this mod is only possible with the mb8719, the mb8734 cannot be modified in this way.
BTW, the stock xtal in the 142 is 11.1125mhz.
hope this helps
matt |
Fusebreaker
Junior Member
Username: Fusebreaker
Post Number: 30
Registered: 3-2004
| | Posted on Tuesday, May 17, 2005 - 8:45 am: |
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11.1758 |
Jms656
New member
Username: Jms656
Post Number: 7
Registered: 5-2005
| | Posted on Monday, June 06, 2005 - 9:56 am: |
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11.1758 takes you down and 11.4758 takes you up. |
Sg569
Intermediate Member
Username: Sg569
Post Number: 132
Registered: 12-2004
| | Posted on Wednesday, June 08, 2005 - 2:02 pm: |
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Bc, I have a grant xl that has been modded w/ a xtal, don't remermber the number right now. But It goes from 26.515 to 28.045 without sliding. If I slide down frm 26.515 I can start at 26.495 and go to 28.065. let me check the #, the xtal in my xl is a 11.1758.
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