When i keyup my d104 mic on cober 148 gtl ihear feedback squeal.but the d104 work good cobera 2000 gtl

There appears to be help here and that forum is the best place to ask. It is a Post Factory modification according to this.

WTB cobra 148 gtl side mic

WorldwideDX Radio Forum https://www.worldwidedx.com > threads > wtb-cobra-...
Feb 27, 2019 - 148 GTL side-mic uses 5 pin mic receptacle. If the radio in question is a side mic and has a 4-pin receptacle, then it was put in post-factory ...

Cobra 148 GTL Malaysia.. side mic?? Should I buy?
Aug 13, 2018
148gtl blown d44 and mic Jack conversion - WorldwideDX
Mar 1, 2018
Old school Cobra 148GTL.... ' WorldwideDX Radio Forum
May 13, 2019
Cobra 148gtl Basket case! ' WorldwideDX Radio Forum
May 7, 2018
More results from www.worldwidedx.com



https://www.google.com/search?q=Cobra+148+GTL+side+mike+jack

..

you may have to add a ceramic capacitor to your power switch. Try using a larger value one .If the feedback is still there then you have to look at the mic . By adding two 0.0001 caps to the Audio and transmit wires it should cure the squeal . If you look online you can find out how to do this .

put on a different mic and see if it still happens.I am going to attempt to draw an insert so if it works follow it if it doesn't I'll explain it.
this wire is the audio on the inside of mic
-------------------------------X-------(4700ohm 1/4 w res) ----X---------
.001 .001
this wire is the shield
-------------------------------X-------------------------------------X----------
at the point marked with X take two .001 capasitors and wire them from one wire to the other. this should make your squeal go away.

five pin /4 pin? (white D-104?)
five pin= 1-audio,2-shield,3-RX,4-comm,5-TX
4 pin=1-shield-comm,2-audio,3-TX,4-RX

try another mic?

without more detailed info, quick suggestion - thermal fault, if all TX audio works when in this fault condition, it may be fair to assume audio IC is ok and check electrolytic capacitors and dry joints.

You're most likely getting lots of RF feedback from the metal cab of your truck,combined with the real sensitive nature of the amplified Turner mike.I would put an old original Cobra (coffin mike) handheld mike or a Astatic Roadking 56 (RK56) on it.They are really hard to beat,especially when you have lots of feedback & squealing. I also have a 148GTL (malaysia made) that has a Turner +3 deskmike & it squeals in my truck but not in the house. The 148GTL has given me better service than ANY other radio I've owned.It has 120 channels (freeband) & upper & lower sideband. I think mine is a 5pin Cobra-type plug-in. Try a simpler mike & good luck. Squirrly

All "older", "real" or "desirable" Cobra 148 GTLs came with side-mounted 5 pin microphone sockets. For wiring information, see...

http://www.offroaders.com/info/tech-corner/reading/mic-wiring.htm

cobra 148 shows no wattage output on external meter but does show good modulation.

Hi again,

Pls see your other post here.

Cheers.