Cobra148gtl final&bias

[kaos513]

do you have it on miliamps DC area on the meter.. also check inside the unit most have a fuse that will blow if you go above what it is rated at. mine goes to 200ma and if I go higher it will blow the fuse. not sure what the 13 you have posted.
to make sure you are doing it right you unplug the wire at the test point then put neg to one contact and the other wire to the other end. then key the mic. one wire is for the driver bias and the other wire is for the final bias. the wire that runs towards the driver is the driver bias ans the wire that goes closer to the final is for the final bias.

my klein meter goes up to 700mA

 

[kaos513]

my klein meter goes up to 700mA

Meter set to 20ma tp8 i get 4.72ma
Meter set to 200ma tp7 i get 191.5 ma

 

[Robb]

Meter set to 20ma tp8 i get 4.72ma
Meter set to 200ma tp7 i get 191.5 ma

Driver should be set to 25mA and the final to 50mA.

 

[kaos513]

blew the dust out of the old techtronics bench meter below is a picture of my reading for the final bias is that correct guys ?

 

[kaos513]

Driver should be set to 25mA and the final to 50mA.

Here is my driver bias readings below is a pictire

Driver should be set to 25mA and the final to 50mA.

 

[kaos513]

Driver should be set to 25mA and the final to 50mA.

so the pictures above are correct readings ?

 

[Robb]

so the pictures above are correct readings ?

So long as that is the mA scale; then yes.

Nice gear!

 

[kaos513]

So long as that is the mA scale; then yes.

Nice gear!

thanks forgot i had this gear in my closet dusted it off and started using it .

 

[kaos513]

thanks forgot i had this gear in my closet dusted it off and started using it .

Im just looking to see if anyone can confirm these readings are correct.

 

[Robb]

Aren't you using the service manual?
http://www.cbtricks.com/radios/cobra/148gtl/graphics/cobra_148_gtl_sm_pg48_pg63.pdf

 

[loosecannon]

Kaos, everything in your picture looks correct, but not knowing how the display works on that meter, i would set the range to the 200m setting and make sure that it still displays a "25" and doesn't show a "1" which would indicate an over range condition.

you have it set to the 2 amp range in the pictures.

If it were my meter, i would set both driver and final using the 200milliamp range.
LC

 

[kaos513]

Kaos, everything in your picture looks correct, but not knowing how the display works on that meter, i would set the range to the 200m setting and make sure that it still displays a "25" and doesn't show a "1" which would indicate an over range condition.

you have it set to the 2 amp range in the pictures.

If it were my meter, i would set both driver and final using the 200milliamp range.
LC

ill will report my results soon thanks.

 

[kaos513]

ill will report my results soon thanks.

something strange i encountered i believe this 148gtl has a wierd bias driver adjustment. my black lead is attached to purple wire and red is attched to ground of radio, that is how i adjusting the bias strange.all my othher radios i have done are in 2000m range and have had no issues strange .

 

[Robb]

something strange i encountered i believe this 148gtl has a wierd bias driver adjustment. my black lead is attached to purple wire and red is attched to ground of radio, that is how i adjusting the bias strange.all my othher radios i have done are in 2000m range and have had no issues strange .

No; your red wire should be attached to one of the two posts.
Didn't you watch my video?

 

[kaos513]

No; your red wire should be attached to one of the two posts

i know that but this is the only radio i encountered this issue will not work on 2000m unless i ground red wire.