[1000mp] Recording from headphone jack

[Pete Smith]

I am having really good results recording contests, using Rec-All Pro and 
an SB-16 PCI basic sound card.  Because I often operate with two radios in 
contests, I need to record from the headphone jack of my SO2R audio 
switchbox, which does a straight passthrough of audio from the radios, one 
of which is a Mark 5.

My only problem is that when I'm using headphones at a comfortable level, 
the audio level is a little low going into the sound card.  I have plenty 
of room left on the audio gain controls on both radios, so I'm debating 
just turning them both up and then using a voltage divider to bring the 
level for the headphones back down to what I need.  Are there 
considerations of impedance matching and/or harm to the audio output 
amplifier that I need to consider in doing this?  Say, for example, that I 
wish to reduce the audio voltage to the headphones by a factor of 2 -- 
would I be safe just using 100 ohms in each leg of the voltage divider?  Or 
should I use some other value?

I know I could use the AF line outputs on the back of the Mark 5, but since 
I wish to record the output from both radios that's not "on."

73, Pete N4ZR

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