cobra 148f-gtl
Jonathan S. Pulling
I just got a Cobra 148. It is a great radio. I am wondering what
mods/peak/tuning can be done to it without making it sound like a monstrosity.
I was talking to someone from "the" local cb shop here, and he mentioned a
"super-mod" for it, which I think he said would make it carry 12 watts and
swing 30-40 (I am not sure, it was a while back, and I don't really remember
exactly what he said). I mean I am relatively satisified with the radio, but
it would be nice to have a slightly bigger radio. I guess what I am asking is
what I should watch out for to make sure I am not going to end up with radio
that sounds distorted, bleeds over everything in existance, and just sounds
bad. Please spare, the "leave it as is." advise. I am pretty close to
leaving it as it is and calling it good, mainly because I am so worried about
ending up with a monster of a radio (in more ways than one). Coppers has
clarifier conversion, power mod, super slide, and super-talk listed under mods
for this radio. I assume the clarifier conversion is to modify the TX
frequency as well as RX. What would the power mod be, just turning up a pot?
I don't have a guess what the super-slide conversion would do. And,
super-talk i guess would be some kind of mod on modulation.
Thanks for you time,
Jon
Beagl...@webtv.net
Cobra 148 , AM Modulation adjust VR-7, ALC (SSB Pwr.) adjust VR-11, AM
Pwr. adjust VR-10......DO NOT ADJUST L19, L20 or L21,These control your
freqs. I also have some neat mods for AGC control, Freq.expansion,mod
meter and supertalk, post if interested
Craig.......
Charles F. Davis Sr.
In article <5rubnh$1io$1...@msunews.cl.msu.edu>, pull...@hotmail.com
says...
> I just got a Cobra 148. It is a great radio. I am wondering what
> mods/peak/tuning can be done to it without making it sound like a monstrosity.
>
> Jon
>
Be real careful of any modification you do to this radio. You have one of
the finest CB radios for both AM and SSB ever made. Don't do anything
that can't be undone. It would pay you to listen to it with someone at
the controls you trust before doing any work.
--
-=>Chas<=-
charle...@worldnet.att.net
NC3881/27.385/LSB
<<I'm the NRA>>
Jonathan S. Pulling
Please do post. If I am going to adjust the VR-7, VR-10, and VR-11, what do I
want to watch for to make sure I don't turn this radio into a piece of junk?
I have access to good scopes that I can hook it up to. If I am going to hook
it up to a scope, how do I do that? I am a radio mod newbie, but I have a
good electronics technician that can help me, and I pick up knowledge from
hands on experience really well.
Another thing I would be interested in is talk-back. I don't know if I would
ever use it, but it would be nice to know how if I ever did. The radio mods I
have found on web pages have been less than helpful most of the time. The
only decent one I have found is one that connects extra frequencies to the
dimmer and tone switches. If I was going to add extra frequencies, I am
paranoid enough that I would like it to be somewhat tricky to get it to work
so that a casual observer playing with my radio won't stumble out of band.
Thanks,
Jon
The2X4
In article <5rvtdm$5el$1...@msunews.cl.msu.edu>, pull...@hotmail.com
(Jonathan S. Pulling) writes:
Listen up you purist guardians! Let this guy do what he wants to with his
radio.
You ain't running it, he is.
Carl
They call me everything in the book
Sumtimes theya call me 2x4
Sumtimes they just call me...when they need a good hand
Then they call me The Radioman
We're in the CB radio bidness!
Carl Motsinger representing EFJ Devices
N9EFJ
-=swfa...@citilink.com
>In article <5rv6q3$i43$1...@newsd-111.bryant.webtv.net>, Beagl...@webtv.net wrote:
>>Cobra 148 , AM Modulation adjust VR-7, ALC (SSB Pwr.) adjust VR-11, AM
>>Pwr. adjust VR-10......DO NOT ADJUST L19, L20 or L21,These control your
>>freqs. I also have some neat mods for AGC control, Freq.expansion,mod
>>meter and supertalk, post if interested
>>
>>Craig.......
>
>Please do post. If I am going to adjust the VR-7, VR-10, and VR-11, what do I
>want to watch for to make sure I don't turn this radio into a piece of junk?
>I have access to good scopes that I can hook it up to. If I am going to hook
>it up to a scope, how do I do that? I am a radio mod newbie, but I have a
>good electronics technician that can help me, and I pick up knowledge from
>hands on experience really well.
>
>Another thing I would be interested in is talk-back. I don't know if I would
>ever use it, but it would be nice to know how if I ever did. The radio mods I
>have found on web pages have been less than helpful most of the time. The
>only decent one I have found is one that connects extra frequencies to the
>dimmer and tone switches. If I was going to add extra frequencies, I am
>paranoid enough that I would like it to be somewhat tricky to get it to work
>so that a casual observer playing with my radio won't stumble out of band.
>
>Thanks,
>
>Jon
Your radio has a external speaker jack and a PA jack on the back. If
you connect the ground side of each of those jacks you will have talk
back. Of course it'll also feed back like a stuck pig with out some
resistance. What I like to do, is use a potentiometer (volume control
from an old radio) to vary the resistance, or volume of the talk back.
You could also use resistors to do the same thing, but what value to
use will be a trial and error process. You'll have to start with what
ever value resistor, turn the dynamike all the way up along with the
mic gain (if using a power mike), put the radio in the area or car
you'll be transmitting the most from and key the mike. If it feeds
back, you need more resistance, if it doesn't, but you can hardly hear
yourself, you need less resistance.
You can see why I like to use the potentiometer. I wire it up,
install it, adjust it, then I'm done.
Hope this helps
MRJ#3
I'd like to see your AGC mod....
MRJ#3