Registr8r3344
Abrams11999
My Cobra 148 GTL doesn't receive a signal at all, and I don't know why. I transmit on the same channel it's on with another CB and it doesn't receive the signal.
-
To anyone looking to acquire commercial radio programming software:
Please do not make requests for copies of radio programming software which is sold (or was sold) by the manufacturer for any monetary value. All requests will be deleted and a forum infraction issued. Making a request such as this is attempting to engage in software piracy and this forum cannot be involved or associated with this activity. The same goes for any private transaction via Private Message. Even if you attempt to engage in this activity in PM's we will still enforce the forum rules. Your PM's are not private and the administration has the right to read them if there's a hint to criminal activity.
If you are having trouble legally obtaining software please state so. We do not want any hurt feelings when your vague post is mistaken for a free request. It is YOUR responsibility to properly word your request.
To obtain Motorola software see the Sticky in the Motorola forum.
The various other vendors often permit their dealers to sell the software online (i.e., Kenwood). Please use Google or some other search engine to find a dealer that sells the software. Typically each series or individual radio requires its own software package. Often the Kenwood software is less than $100 so don't be a cheapskate; just purchase it.
For M/A Com/Harris/GE, etc: there are two software packages that program all current and past radios. One package is for conventional programming and the other for trunked programming. The trunked package is in upwards of $2,500. The conventional package is more reasonable though is still several hundred dollars. The benefit is you do not need multiple versions for each radio (unlike Motorola).
This is a large and very visible forum. We cannot jeopardize the ability to provide the RadioReference services by allowing this activity to occur. Please respect this.
Cobra 148 GTL doesn't recieve signal on any modes
- Thread starter Registr8r3344
- Start date
- Status
MindenJoe
Member
Do you have any sound coming out of the speaker?
Registr8r3344
Abrams11999
Just a bunch of static I'm afraid. When I keyed up my handheld radio next to it, it didn't receive the signal. What I also found odd is that there's no change when I attach an antenna.
And the upper channels, 19 through 40, have nothing but very low static.
New problem, too. Nothing but static when I key up and talk on channels 11 through 40 on the GTL. No voice.
And the upper channels, 19 through 40, have nothing but very low static.
New problem, too. Nothing but static when I key up and talk on channels 11 through 40 on the GTL. No voice.
Last edited:
jhooten
Member
Let’s check the basics first, where is the RF Gain control set?
Registr8r3344
Abrams11999
RF Gain is set as high as it can go.. Though it doesn't seem to change the sound coming out of the speaker at all..
Where does the signal vanish? For example if the signal strength meter moves, we know the signal's at least getting to the IF stage. If you had a signal sniffer of some type or another, that would probably be the easiest/cheapest way to track something down...
Registr8r3344
Abrams11999
Channel 12 is intermittent.. anything higher than that gets worse
I'll try to find another mic
Figured out the problem. Frequency is WAY off. RX and TX.
I'll try to find another mic
Figured out the problem. Frequency is WAY off. RX and TX.
MindenJoe
Member
The 148 GTL has a receive enable contact in the microphone transmit/receive switch to enable the speaker audio, perhaps a contact is bad. Try another microphone.
Sounds like a bad synthesizer or its out of lock or the reference crystal is bad, etc.
Registr8r3344
Abrams11999
Update: I got TX working again, fixed the microphone, but still no luck with RX..
Registr8r3344
Abrams11999
Radio is probably just receiving off frequency, but I don't know how to figure out what frequency it is receiving..
Registr8r3344
Abrams11999
Yes, TX is on frequency.
Registr8r3344
Abrams11999
I adjusted the TX frequency back to normal
Receiver local oscillator problem?
Registr8r3344
Abrams11999
Could be the local oscillator.
Hey, maybe its the local oscillator....
Registr8r3344
Abrams11999
Don't know how to fix that, mainly because I don't even know where the local oscillator is..
Its a part of a receiver which supplies the final information on what frequency it will receive before being downconverted to an IF frequency for further filtering then demodulation. If the local oscillator is not working the receiver cannot convert anything to the IF frequency to be demodulated except for noise. Its easy to check if you have test equipment and a diagram of the radio.
Registr8r3344
Abrams11999
I only have a diagram of a very similar radio which I also own, the Cobra 148 NW ST Soundtracker. From what I've heard, they're pretty much the same internally.
- Status
