[Kenwood] Matching transformer for mike

[Richard Knoppow]

    Level are important. If the output level of the processor is 
high you need a resistive attenuator which will also serve to 
match the impedance.
    In general, American practice is to state microphone input 
impedance as the expected source impedance, usually there is no 
need to match impedances because the source is a voltage source 
not a power source. For instance, in historical broadcast 
equipment and sound equipment designed to work from low impedance 
microphones the the typical input impedance was on the order of 
5K ohms or more while the source impedance was on the order of 
150 ohms. For equipment that runs at line level the impedance is 
usually a terminating impedance, source impedance can be the same 
or sometimes not.
    See if the processor is meant to drive a microphone input or 
a line level input. If a line level input you need an attenuator 
to get the level down to mic level, maybe as much as thirty db. 
The exact impedance is not critical.

On 7/9/2020 7:53 PM, Steve H wrote:
> I am trying to hook up a Symetrix 528E voice processor to my 
> Kenwood Hybrid 830S and was told that the mike input is about 
> 150 ohms
> to the rigg and the processors output is 600 ohms.
>
> Other hams I think use a matching transformer, I guess  4 to 1? 
> Anyone out there have any experience selecting a matching xfmr 
> for the Hybrids?
>
> Steve Hearns
> KA2PTE
>
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-- 
Richard Knoppow
1oldlens1 at ix.netcom.com
WB6KBL