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Teaberry Stalker XX not the 8719 board...

Lkaskel

Lkaskel

Well-Known Member
Aug 4, 2017
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Hi Gang,
I have on the bench a mint condition Teaberry Stalker XX. The service manual for this radio shows the 8719 chip and the 411 board. The radio I have has an MB-8734 chip and the PC-385AF board. The layout of the board is different and the components are different compared to the 411 board. Not the same quantity of coils or the same locations. The radio is factory stock. I am now looking for a service manual/alignment instructions for this board.

Any thoughts?

Thanks as always!!!
 

Any Thoughts you say? I do have a thought, And my thought is this is just to much trouble for you! Let me take the radio off your hands for say $100 bucks and I will get it working as it was intended. Any Thoughts? LOL!

OldTech
 
OldTech03 said:
Any Thoughts you say? I do have a thought, And my thought is this is just to much trouble for you! Let me take the radio off your hands for say $100 bucks and I will get it working as it was intended. Any Thoughts? LOL!

OldTech
Click to expand...
I would need at least $101 so I make a buck :)
 
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Teaberry, Simpson Pearson and a few others are overseas aversions of Uniden/President. Simpson.
 
The MB8734 is the same chip as the MB8719, but with one difference.

Pin 10 has been disabled inside the 8734. The FCC approved a number of Uniden-made CB models that used the 8719 before they discovered that changing the logic state of pin 10 would allow you to move the radios coverage outside the legal 40 channels.

They wouldn't cancel the approval for radios already on the market. But this caused Fujitsu to redesign the chip.

Just slightly. Pin 10 on the MB8734 does nothing. Other than that it's the exact, same chip.

Most-common example of this is the original 1979 Cobra 148GTL. Had the MB8719 chip.

But the Cobra 2000GTL uses the MB8734. The two radios are nearly identical inside, but because the 2000GTL was approved by the FCC after they tightened the rules, it had to be built with the crippled MB8734. The 148 squeaked in under the deadline, and got approved to be sold with the older MN8719 in it.

Same circuit board, different chip.

73
 
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The 8719 can use either the 11.1125 crystal, with pin 10 grounded. This setup is found in Uniden-made SSB CB radios like the 5-pin Uniden Washington, Cobra 142GTL, Realistic TRC490 and a few others.

Or it can use the 11.325 crystal with pin 10 left unconnected. This was used in SSB CB models that had a second IF frequency of 455 kHz for AM only, the so-called "dual conversion" models like the Cobra 148,2000, Uniden Madison and others.

The MB8734 can use only the 11.325 crystal.

73
 
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loosecannon said:
this is a weird variant. i have a realistic mobile like this.

it is a single conversion chassis, but uses the 11.3258 crystal.
you should be able to use the info for a washington, or 140GTL, or the TRC-450.

here is the info for the TRC-450:
http://www.cbtricks.com/radios/realistic/trc_450/index.htm

that might work for you.
LC
Click to expand...
Hey Gang,
Thanks so much for your input!!! The board in the TRC-450 was the right one so thanks for the direction Loosecannon!!! The radio is alive and working great except for the clock. It is just flashing 8:88 and will not set. It has no reaction to any of the buttons for it so I am unsure what to do but I will continue the journey. This radio is really nice. I'm glad it is working.

Thanks again!!!
 

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