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Cobra 87 GTL questions

CB_CHRIS

New Member
Oct 13, 2013
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I bought an old cobra 87 GTL the other day. .. like new condition in a package deal with a Motorola maxtrac. .. my question is, are these good performers.... and what kind of mods if any can I do to increase performance. Also have a Royce 1-632 ssb cb I am curious about. Any info will help.
 

I believe these are essentially a Cobra 25 in a box. I'd run it. They built these back in 1978.
 
the 87GTL is the base station version of the 29GTL, which is very, very similar to the 29LTD.

so, with a little comparing of the schematics, most, if not all mods that are for the 29LTD could be done to the 87GTL.

that being said, there are minor differences, and those need to be worked out before attempting the mods.
that is why we cant just give you a list of mods for that radio.

i can tell you that VR6 is your modulation control, and that L17 and L13 are the coils to peak for increased modulated power out.
(that means peak them for max watts with modulation applied, NOT max deadkey)

here is a link to the schematic of the 87GTL:
http://www.cbtricks.com/radios/cobra/87gtl/graphics/cobra_87gtl_sch.pdf

here is a link to the schematic of the 29LTD:
http://www.cbtricks.com/radios/cobra/29ltd_29ltd_st_29wx_st/graphics/cobra_29_ltd_classic_sch.pdf

when you find a mod for the 29LTD (they are all over the internet), just compare the schematics to see what changes you need to make to make them work with the 87GTL.

good luck,
LC
 

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