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JohnHammer 02-11-2006 01:54 PM

Recording a call with my 7520
Here's one I've not seen talked about before...

I'm a radio guy and I regularly record telephone conversations in my studio using a professional telephone hybrid. However, I'd like to do the same thing in my home studio. Here's what I'm thinking...

The audio jack on my 7520 is a 2 way line: 1 input, 1 output (mic & speaker). I could create a cable that splits the signal and run the output (speaker) to my studio control board, then run a monitor line (carrying the studio mic output) from the board back to the input of the 7520 (so the person on the phone will hear me talking from my mic).

Now, here's where my question comes in...

I can't imagine the input line (mic) of the 7520 can handle the output level of my control board...can it? If I tried it, will I blow that circutry to kingdom come?

Do you know of a safe way I can record a conversation with this phone?


John Hammer
Multimedia Host

oceanthrsty 02-11-2006 02:02 PM

Well I would say the blackberry is expecting mic level (around -40 to -50 dB) and I am sure your board is going to output line level (around +4 dB). So just pad the signal around 40 to 50 dB and you won't blow it out of the water.

JohnHammer 02-11-2006 02:37 PM

That's what I was thinking, but I don't actually know what the BB mic input is nor how low I can get an output from my board. The theory seems right, but I'm not ready to sacrifice my BB to find out by trial & error ;)

How about this...if I do try it & blow the circuit in the BB...will my Bluetooth headset still work? I mean, if I only blow out the earpiece circuit, but the rest of the unit was still operational...I'd give the original idea a shot.

logiclost 02-12-2006 12:03 AM

Personally, I'd get a cheap bluetooth headseat and rip it apart and then patch it in. At least then you are only out a bluetooth device and the blackberry is completly isolated from anything harmful. Doing it this way would also probably cut down on interference from the radio hardware as well as it could facilitate a good amount of distance.

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