ARRL

Secure Site Login

Forum Home - Rules - Help - Login - Forgot Password
Members can access, post and reply to the forums below. Before you do, please first read the RULES.

Yaesu FT-2900R Headphone

Feb 9th 2016, 05:02

KE0FEN

Joined: Jul 20th 2015, 15:06
Total Topics: 0
Total Posts: 0
I recently purchased a Yaesu FT-2900R. It has an external speaker output on the back. I attempted to plug a headphone into said port and get a hum all the time, whether receiving or not. I don't get this hum from the internal speaker, so I assume my headphone is not correct in some way, but I am wondering if this assumption is correct, or if my radio is defective in some way.
Does anyone have any experience plugging a headphone into the external speaker jack of a Yaesu radio? Is there a certain headphone that works? Should I hear hum when not receiving? Any and all help would be greatly appreciated.

Thanks
Mike
Feb 9th 2016, 14:47

W1VT

Joined: Apr 4th 1998, 00:00
Total Topics: 0
Total Posts: 0

Plugging headphones in a speaker jack is a bad idea--you could easily damage your hearing and the headphones with power needed to drive a speaker. You are hearing hum because the headphones are too sensitive to be driven by a typical speaker output.

You need to attenuate the signal from the speaker jack.

http://sound.westhost.com/project100.htm
Here is a simple project to do that.

Zack Lau W1VT
ARRL Senior Lab Engineer

Back to Top