[CQ-Contest] Yamaha CM500

[KL7RA]

Hi Art

>So, do you need the Syba (or whatever) external box to get 
>the DC, or does the CM500 come with an adapter 

The headset comes with the adaptor which is just a little
battery holder with two double A's and the mic in and out. 
Puts the battery DC on the ring going to the mic and from 
that adaptor the audio is on the tip going to the radio.  

This is a headset designed for a PC so you can also just 
plug it into the computer soundcard and then cable audio
out back to the radio mic in. The soundboard provides the
correct DC bias. The Window's audio sets the levels for mic 
in, audio out and the wave file which is the recording for 
the voice keyer. 
   
I found the PC's I use for multi-op have very poor soundcards 
that pick up a lot of noise from the motherboard so I use the 
Syba USB external devices that provides the correct DC as well 
and sound excellent for DVK during a contest. 

73 Rich KL7RA