View Full Version : Kenwood 7400A
05-30-2006, 06:57 AM
I have a basic question on this rig. What does the "tone" knob do? There are 4 selections, and Im not exactly sure on the function of this selector. I bought it used on ebay and did not get the owners manual. Any help would be appreciated.
05-30-2006, 11:07 AM
You have a solid radio that is almost immune to any cross mod. Had one for over 30 years.
The tone knob, if the internal accessory is plugged in, will allow to tone to be transmitted, or will open the receiver if the correct tone is received, or both, or none of the above. Off/None is correct position if no board is installed.
If you don't have the manual, get one. They are invaluable.
05-30-2006, 05:25 PM
I see. Is that the PL tone? Or the DTMF thats on the side? Im assuming I should just leave it on off. Do you know of a place that has the manuals? Or am I going to have to buy it?
05-30-2006, 07:25 PM
Yes it is PL. There is NO DTMF available unless you want to add an external TT Pad, which is what I did to mine.
For manuals, you could try the Kenwood site or the BAMA site. There are others as well. Google one.
06-07-2006, 11:56 AM
If they strike out, try www.manualman.com. #Pete is a good guy, a fellow ham and has a HUGE inventory of stuff.
06-13-2006, 06:58 PM
The internal tone board is good for one tone only and virtually impossible to find. For best results, use an outboard tone generator. They are all over eBay for $20 -$30. I use a Communications Specialists TE-12P and it's a good marriage. IMHO, the TR-7400 is one of the best VHF radios anyone ever produced!