[Elecraft] K3s rear mic connector and shure SM58.

[Joe Subich, W4TV]

On 10/6/2017 11:36 AM, Jim Brown wrote:
> 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.
That may work with the K3/K3S which have a relatively low impedance
between the mic return and chassis.  Tying the shield to mic return
is a complete disaster on older rigs (FT-1000D, FT-1000MP, most Kenwood,
etc.) where the mic return is the emitter of the mic preamp which has
an *unbypassed* resistor and/or RF choke to DC return/chassis.  That
[relatively] high RF impedance is like connecting an antenna directly
to the mic.

73,

    ... Joe, W4TV


On 10/6/2017 11:36 AM, Jim Brown wrote:
> 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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> 
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