I really do enjoy learning all I can about cb radios and their many functions. Just don't understand what all I need to check when there is no tx signal. Sure am hoping someone can tell me what I need to check from start to finish of the tx problem. It would be greatly appreciated for sure.tx
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Trying to learn about the tx section on the cobra29ltd classic and needing help
- Thread starter SlamIam
- Start date
Might help to know what tools you're working with.
Wattmeter?
Frequency counter?
Volt/ohm meter?
A second working radio that you can use to 'sniff' for a weak transmit signal inside the radio is a big help. Plug a coax jumper into your receiver and thread the outer ring of the plug on the other end back over the coax. The center pin is now a half-inch long "sniffing" antenna. Probing around the radio's driver transistor will tell you if the radio is generating a transmit signal at all. If not, leave the driver and final transistors alone for now. This would mean the problem is upstream from the transmit-power section.
And if you do hear a carrier, it's helpful to see if you can hear any voice modulation when you talk into the mike. If not, that serves to narrow down where to look next.
If you have a larger interest in this beyond this one radio, there is a book that's incredibly helpful with this. It's called the "Screwdriver Expert's Guide".
Written by Lou Franklin. He has a web site at http://www.cbcintl.com{/url] 73
Wattmeter?
Frequency counter?
Volt/ohm meter?
A second working radio that you can use to 'sniff' for a weak transmit signal inside the radio is a big help. Plug a coax jumper into your receiver and thread the outer ring of the plug on the other end back over the coax. The center pin is now a half-inch long "sniffing" antenna. Probing around the radio's driver transistor will tell you if the radio is generating a transmit signal at all. If not, leave the driver and final transistors alone for now. This would mean the problem is upstream from the transmit-power section.
And if you do hear a carrier, it's helpful to see if you can hear any voice modulation when you talk into the mike. If not, that serves to narrow down where to look next.
If you have a larger interest in this beyond this one radio, there is a book that's incredibly helpful with this. It's called the "Screwdriver Expert's Guide".
Written by Lou Franklin. He has a web site at http://www.cbcintl.com{/url] 73
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