[Elecraft] Good Low Cost Audio to USB Interfaces For Digital Modes

[Pierfrancesco Caci]

>>>>> "Jim" == Jim Brown <jim at audiosystemsgroup.com> writes:


    Jim> On 3/24/2012 1:19 PM, Pierfrancesco Caci wrote:
    >> Jim, how do you set the little volume control?

    Jim> I've never found a gain control for Record. :)  There are two inputs -- 


I was talking about the rotary control on the side of the box.

    Jim> a Line level input that I suspect is designed to work at a few volts, 
    Jim> and a Phono input which is designed to work at the level of a phono 
    Jim> cartridge (the type used to play vinyl records).

    Jim> The Phono input has RIAA equalization, which boosts low
    Jim> frequencies and  
    Jim> rolls off high frequencies.  I use the Phono input with a simple RC 
    Jim> filter network between the radio and the Numark.  I'm going
    Jim> from memory,  
    Jim> but I believe what I used was 200 ohms across the output of the radio, 
    Jim> 200 ohms across the input to the Numark, and 0.22 uF between the radio 
    Jim> and the Numark.  This simple network is designed specifically to match 
    Jim> the K3. The Phono input has a LOT more gain than the Line
    Jim> input, so this  
    Jim> gives the unit the ability to handle any signal level you're likely to 
    Jim> get from a radio.

Interesting. If it has more gain, isn't it more likely to saturate,
given that the radio has a Line level output? Your suggestion seems
counterintuitive to me, I must be missing something.

Pf

-- 
Pierfrancesco Caci, ik5pvx