NEED INFO ON SUPERSTAR 360 FM PCB 010

[cottentop]

HI JUST GOT 1 IT WORKS OK BUT HAS SAT FOR FEW YEARS NEEDS A TWEEK HERE AND THERE HOW CAN I GIT MOR MODULATION OUT OF THIS RADIO AND HOW SHOULD I PUT TALKBACK IN IT THANKS

 

[Robb]

Superstar 360

 

[AudioShockwav]

If you have the Equip to do an alignment of the transmitter, that is the best bet.
For just a quick touch up, VR-14( corrected VR Number) Is the AM Mod control, and maybe a good power mic.
Cheap and dirty talk back, find diode D-80, pull one end of it and insert a switch in series with it.....switch open, talk back on, switch closed talk back off.
I am not a real fan of talk back, causes more feedback problems than it is worth really.

73
Jeff

 

[cottentop]

Thanks Robb
but what i am having trouble finding on the board is r 249 i was told that clipping this might give more modulation as right now with the VR14 wide open i am only seeing 75% and it should be set at 90%

also i am told that removing D80 should give me talk back i am just having trouble finding them on the board any help would be good a pic would be ( grate ) thanks wayne .

 

[cottentop]

Hi Jeff
are you shure it is VR7 my radio has the pcb 010AB and it is not the 8719 pll my amc should be VR 14 and when i turned it the modulation went up and down thanks wayne

 

[AudioShockwav]

Opps, My Bad, you are correct, it is VR 14....Have you tried a Amplified Mic?
It is the same board as the 148 gtlDX late version I think, Look here:

http://cbtricks.com/radios/cobra/148gtl_dx/graphics/cobra_148_gtl_dx_sm_pg32_63.pdf

And here:

http://cbtricks.com/radios/cobra/148gtl_dx/graphics/cobra_148_gtl_dx_sm_pg44_45.pdf

This Is a PDF file, need Adobe To read it, but you can increase the size with good results.

73
Jeff

 

[Robb]

What does VR7 do?
Sure hope it isn't out of whack now...

 

[AudioShockwav]

Carrier Balance on this board.
With no Audio Input, Upper Sideband Mode, key transmitter, and adjust VR7 for min output at antenna Jack, recheck carrier suppression on Lower Side Band, which should be the same.
I had it in my head it was the other board.


73
Jeff

 

[cottentop]

H i guys no VR7 is ok i dont touch any thing till i am real shure where it is and what it dos i ask are D80 and VR 249 near a big gray or silver looking
cylinder on the s/ rf meater side of radio doward the back i think that is where they might be but things are so close there ?? again thanks for the help

 

[cottentop]

HI
just an update i did finde 249 clipped it did not make much diff ( so maybe i have a weak part some where ) i also cliped D 80 and it did nothing no talkback so o well but thanks fore the help

 

[Harley3315]

Any way to do both 10kc up and down on this radio I see unit 399 has the mod for just up on a page he made.