[Elecraft] K3s rear mic connector and shure SM58.

[Joe Subich, W4TV]

 > I believe this is where my problem is. The rear mic jack is wired as
 > mono (ring is not connected to anything) so it is an unbalanced input.
 > Connecting the mic audio(-) to the shield might work.

An XLR mic sound always be connected with Mic(+) to tip and Mic(-) to
the sleeve of the K3 rear panel mic jack.  A microphone (unless it is
a dual capsule M/S microphone) is always a mono device.  The K3 mic
inputs are *unbalanced* but any dynamic mic - including the "pro"
dynamic mics can be run unbalanced by connecting Mic(+) to tip and
Mic(-) to sleeve (mic return) and *leaving the shield floating*.

The Shure SM 58 is rated for -57.5 dBV/Pa that is only about 3 dB less
than most of the Heil dynamic mics and certainly within the capability
of the K3 with MENU:MIC SEL = rP.H and bias *OFF*.  No external preamp
required.

73,

    ... Joe, W4TV


On 10/4/2017 11:21 AM, Stewart wrote:
> 
> 
> On 10/3/2017 8:12 PM, Jim Brown wrote:
>>
>> My guess is that the cable is not wired to mate with the K3. Study the 
>> pin-out in the K3S manual. From the balanced mic, connect one of the 
>> signal wires to Mic In, the other signal wire to Mic Return, and the 
>> cable shield to the chassis.
>>
>> 73, Jim K9YC
>>
>>
>> _
> Hi Jim
> I believe this is where my problem is. The rear mic jack is wired as 
> mono (ring is not connected to anything) so it is an unbalanced input. 
> Connecting the mic audio(-) to the shield might work. Or an audio 
> transformer could be used to convert from balanced to unbalanced ie., 
> audio +/- to primary and one leg of secondary to tip and other to 
> sleeve. Any thoughts on this?
> Others must be using the rear jack. How are they doing it? Contacted 
> Heil and they don't have an adapter.
> I am mainly a cw op and just don't want the clutter of a mic (or the 
> wiring) on the desk.
> Stew ke4yh
> 
> 
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