[Elecraft] K3s rear mic connector and shure SM58.

[Jim Brown]

I'm with Bob on this. While the K3 and K3S DOES have a Pin One Problem 
at the rear panel mic input (the cable shield goes to the chassis 
through a capacitor), floating the cable shield is not a good solution, 
and it should be tied to the connector sleeve.

When a rig  DOES provide chassis at the mic connector, the balanced mic 
lines should be wired to MIC+ and MIC-, and the cable shield should be 
tied to the chassis. In general, it's also OK to tie Pin 1 and Pin 3 
together AT THE RIG and connect them to the chassis.

73, Jim K9YC

On 10/6/2017 5:50 AM, Joe Subich, W4TV wrote:
>
> > Pin #1 & #3 to ground
>
> Pins 1 and 3 should *never be tied together*.  If your transceiver has
> a balanced input *or* a *separate* case/chassis connection, connect
> pin 1 (shield/mic case) to the case/chassis connection (ideally to the
> *shell* of a Foster mic jack that is bolted securely to the metal case
> of the transceiver).
>
> If your transceiver does not have a separate case/chassis connection
> (the K3/K3S rear mic jack *does not*) leave pin 1 disconnected
> (floating).
>
> 73,
>
>    ... Joe, W4TV
>
>
> On 10/5/2017 9:30 PM, Bob McGraw K4TAX wrote:
>> No preamp required.  Set the Mike gain via the menu to high. Easy to 
>> wire the mike XLR to an unbalanced circuit.   Pin #1 & #3 to ground 
>> and Pin #2 to MIC high. See page 55  of the manual [MIC SEL] for 
>> details.
>>
>> If you close talk the mike it will be bottom end heavy. Typically no 
>> closer than 4" will be OK.  Move in closer and the bottom end comes 
>> up, back away and the bottom end falls off. This is due to the 
>> proximity effect of they type dynamic mike.
>>
>> Otherwise, they sound quite good/.
>>
>> 73
>>
>> Bob, K4TAX
>>
>>
>> On 10/3/2017 1:50 PM, Stewart wrote:
>>> Is anyone using a Shure SM58 mic with their K3s? If so are you using 
>>> a preamp? My O'scope shows that the mic and cable are good but level 
>>> is pretty low.
>>>
>>> I don't get anything with the mic connected to the rear mic jack. 
>>> Config is set to rp l , bias off. I tried mic gain from 0 - 100.
>>>
>>> K3s is new so I may be missing some menu item.
>>>
>>> Regards,
>>>
>>> Stew ke4yh
>>>
>>>
>>>
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