EXPO B KIT WHAT CRYSTALS ARE IN THE KIT??

Discussions on CB Radio Modifications
Post Reply
User avatar
speedracer6g
Light User
Light User
Posts: 165
Joined: Saturday 23rd Feb 2008, 13:35
First Name: Michael
Location: East Freedom, PA
Contact:

EXPO B KIT WHAT CRYSTALS ARE IN THE KIT??

Post by speedracer6g » Sunday 21st Sep 2008, 8:14

I am building a b kit and need the crystall information for that model. I dont have one here in the shop to compare it to. Any information would be appreciated. I already looked at cbtricks too.

Mike

timrim
Heavy User
Heavy User
Posts: 257
Joined: Thursday 29th May 2008, 10:11
Location: Ohio

Post by timrim » Sunday 21st Sep 2008, 8:39

What model radios use the B-Kit? I don't normally stock the B-Kit but I can possibly calculate the crystal frequencies for you. What PLL chip is in the radio and if possible, what is the current mixer crystal in the radio?

User avatar
speedracer6g
Light User
Light User
Posts: 165
Joined: Saturday 23rd Feb 2008, 13:35
First Name: Michael
Location: East Freedom, PA
Contact:

Post by speedracer6g » Sunday 21st Sep 2008, 11:57

its a 142gtl radio. the mixer crystal is 10.24mhz and the pll is a mb8719.

thanks

MIKE

timrim
Heavy User
Heavy User
Posts: 257
Joined: Thursday 29th May 2008, 10:11
Location: Ohio

Post by timrim » Sunday 21st Sep 2008, 16:10

speedracer6g wrote:its a 142gtl radio. the mixer crystal is 10.24mhz and the pll is a mb8719.

thanks

MIKE
That is the reference oscillator crystal, you don't want to change it, you will find another crystal, either an 11.3258 or an 11.1125, Depending on if pin 10 of the PLL is tied high or low.

User avatar
speedracer6g
Light User
Light User
Posts: 165
Joined: Saturday 23rd Feb 2008, 13:35
First Name: Michael
Location: East Freedom, PA
Contact:

Post by speedracer6g » Monday 22nd Sep 2008, 9:01

Sorry got the wrong one it is an 11.1125 crystal. I know that the 11.325 crystal is .150 up and down from 11.325. Is it the same for 11.1125.

MIKE

timrim
Heavy User
Heavy User
Posts: 257
Joined: Thursday 29th May 2008, 10:11
Location: Ohio

Post by timrim » Monday 22nd Sep 2008, 11:27

Yes, I have the data somewhere at work and I will have to peek at it.

User avatar
The Defpom
Site Admin
Site Admin
Posts: 435
Joined: Friday 20th Aug 2004, 18:06
Location: New Zealand
Contact:

Post by The Defpom » Monday 22nd Sep 2008, 23:53

Divide the difference in frequency by 3, to give you the required frequency, as the 11MHz crystal is tripled before mixing in the the VCO.

So if you want 1 band up (or down), divide 450KHz by 3 to give you 150KHz, which is the difference in frequency from the original crystal and go from there.

User avatar
speedracer6g
Light User
Light User
Posts: 165
Joined: Saturday 23rd Feb 2008, 13:35
First Name: Michael
Location: East Freedom, PA
Contact:

Post by speedracer6g » Tuesday 23rd Sep 2008, 12:23

I have the kits that will work with the 11.3258 crystals so i think i will just lift the 10 pin of the pll and put in the 11.3258 crystal and use that kit. I checked my suplier for the crystals i need to do that mod and they dont have them so i will just change the crystal and mod the pll.

thanks guys,

MIKE 8)

Post Reply

Return to “CB Radio Modifications”