[Elecraft] Balanced Mic to Unbalanced Connection Follow Up Question

[Bob McGraw K4TAX]

Since the input is clearly marked MONO, a tip-sleeve is the correct plug. If one uses a TRS plug, the ring should be connected to the sleeve inside the plug. 

Using a mike which has an XLR, pin 2 should connect to the Tip, pin 3 to the sleeve, and the shield only connects to XLR pin 1 at the mike.  It does not connect to the sleeve at the radio. 

Bob, K4TAX


Sent from my iPhone

> On Jun 9, 2020, at 10:20 PM, Nr4c <nr4c at widomaker.com> wrote:
> 
> If yuh ou use a TRS plug, don’t use the “ring” for anything. 
> 
> Extending the pin 1 wire out of the connector and connecting to the radio “Ground” lug is also tecvonended in some circles. 
> 
> Sent from my iPhone
> ...nr4c. bill
> 
> 
>> On Jun 9, 2020, at 4:51 PM, Tony <dxdx at optonline.net> wrote:
>> 
>> All:
>> 
>> I have a follow-up question regarding balanced mics and unbalanced connections. I'm about to connect a balanced dynamic microphone (Heil PR-781) to the rear mic input on my K3S which has a 1/8" unbalanced mono connection.
>> 
>> One recommendation was to connect XLR pin #2 mic (+) to the tip of the 1/8" jack and pin #3 mic (-) to the sleeve. In this case, pin #1 or ground is left floating with no connection. A 1/8" mono jack was recommended for this setup.
>> 
>> The other recommendation was to connect pin #2 to the tip and pin #1 and #3 to the sleeve of the 1/8" jack. It was also suggested that I can use either a 1/8" mono or a stereo TRS jack in both cases.
>> 
>> So which is correct?
>> 
>> Tony -K2MO
>> 
>> 
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