Cobra 150 and 200 GTL

[Drifter]

If you have a 200 keying 100 on high, you need to back it off to around 35 watts. 100 is way too high to be efficiently modulated. A general rule of thumb is to have a key wattage that is 4 times lower than your max PEP. for 150 watts, 37.5 is key power to look for, and its generally best to under-key just a tad.

It came like that..... How do I adjust the dead Key??? what pots to turn. I am not sure I feel comfortable messing with it..... and then again I am thinking with all the problems other people are having with theirs I think I sould leave it alone.... "If it aint broke don't fix it"

Thanks

 

[DTB Radio]

I don't have a specific pot number to give you (I'm sitting at home at the moment). It is best to have a tech do it, though. If you decide that you want to give it a try, www.cbtricks.com has the info you need.

 

[DTB Radio]

I spoke with Ramon Sandoval at Cobra, and this is the fix he gave me for the 200's receive issue. Place a 220pf cap from the emitter to the base of Q3. This does not
affect over-all sensitivity, but reduces the problem of splatter from close radios.

 

[rachet_jaw]

Just talked to guy today on 38LSB in Denton, NC while I was in Rockwell, NC. And I must say if that was actually what he was talking on, it was a really good sounding radio.

I know / heard of lot of people being happy with them...........
And of course the number of people who nothing but bad to say about them....(usually the galaxy and connex guys, if you know what I mean)

 

[freecell]

here's Technical Service Bulletin #10043 for the Cobra 150, 200 GTL-DX.

http://www.firecommunications.com/rxbulletin.doc

 

[DTB Radio]

LOL! I posted before I saw your post, Jack! Oh, well, at least the mod to correct those problems is available now.

 

[Thestonerguy]

LOL! I posted before I saw your post, Jack! Oh, well, at least the mod to correct those problems is available now.

And relatively simple to fix also

 

[Thestonerguy]

rx and tx?

here's Technical Service Bulletin #10043 for the Cobra 150, 200 GTL-DX.

http://www.firecommunications.com/rxbulletin.doc

Good documentation, but just to clarify - It's a receive fix (from what it appears to be), but it also mentions a problem with a warble in transmit. Is the warble fixed via this rx mod? or is it just a sidenote that some people have noticed a warble in their tx? Or maybe I just got up too early this morning.. TIA

 

[DTB Radio]

The warble is the problem in the 150 on higher power. RF is bleeding into the receiver causing the problem. That cap mod is supposed to fix that. I havent had the opportunity to try it on a 150 yet.

 

[Thestonerguy]

The warble is the problem in the 150 on higher power. RF is bleeding into the receiver causing the problem. That cap mod is supposed to fix that. I havent had the opportunity to try it on a 150 yet.

Okay, thanks for the explanation - TSG

 

[freecell]

here's the same bulletin in pdf format........

http://www.firecommunications.com/rxbulletin.pdf

 

[C W Morse]

Just talked to guy today on 38LSB in Denton, NC while I was in Rockwell, NC. And I must say if that was actually what he was talking on, it was a really good sounding radio.

I know / heard of lot of people being happy with them...........
And of course the number of people who nothing but bad to say about them....(usually the galaxy and connex guys, if you know what I mean)

If you were in Rockwell, you probably know where Stokes Ferry Road is! All aboard for Salisbury, Granite Quarry, Faith, Rockwell, Gold Hill, Misenheimer, and Richfield!! And you can get to Stokes Ferry by turning onto Dunn's Mtn. Rd. (and a couple others!)

CWM

 

[rachet_jaw]

Just talked to guy today on 38LSB in Denton, NC while I was in Rockwell, NC. And I must say if that was actually what he was talking on, it was a really good sounding radio.

I know / heard of lot of people being happy with them...........
And of course the number of people who nothing but bad to say about them....(usually the galaxy and connex guys, if you know what I mean)

If you were in Rockwell, you probably know where Stokes Ferry Road is! All aboard for Salisbury, Granite Quarry, Faith, Rockwell, Gold Hill, Misenheimer, and Richfield!! And you can get to Stokes Ferry by turning onto Dunn's Mtn. Rd. (and a couple others!)

CWM

Yep! sure do know where its at! I am pretty much at the junction of 52 & 152. Good area, you can always find someone on the ol'cb , 8 , 10, 11 , 20 AM sometime the boys around Raliegh on 28. And of course 38LSB.

 

[Quickstop]

power supply

do you think the 200 GTL can be run off a cigarett power supply ?
i do not drive the same truck all the time . and have to take out radio every time. cig is the quickest way for power. i am running a 2510 now for the last 12 yrs, works fine with cig power.

 

[rachet_jaw]

Quickstop,
I really cant imagine the 200 GTL behaving very well on a cigarette lighter plug.
Just take the time and run you apower wire from the battery.
The plug on the back looks like some of the ham rigs outthere , so a spare power cord shouldnt be too bad to come by.