[GreenKeys] Far OT: audio inputs

[eugene at hertzmail.com]

Sorry for the OT post, but lately this is the last bastion of normal
people on qth where not every topic devolves into flames.

 

I have an exciter (rf-1310) that has several audio inputs. Any audio
input can be selected for any type of mode (two different inputs are
selected for ISB mode).

 

Two of the inputs are transformer input with 3 connections. 2 outside
and one center tap connection.

Three of the inputs have differential amplifier inputs (op amps?) with
only two connections (basically inputs to the inverted and non-inverted
inputs to the op amp)

 

All inputs seem identical in terms of expected input levels (0dbm
nominal into 600 ohms). So why would I choose one type of input over the
other? Whats the benefit/difference/proper application?

 

The inputs I am interested in using are 

a)       PC audio out 

b)       A Sure 55S dynamic mic with High (100K ohms) Medium (150-250K
ohms) and Low (30-50) impedence selection 

c)       A D104 mic non-amplified

 

Do I need an amplifier beteween the mics and the 600 ohm 0dbm inputs of
this exciter? 

 

So what do I need to know about audio inputs? 

 

Thanks

Eugene

 

 

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