Correcting *ALL* the typos <G> ....
So which is correct?
They are electrically equivalent.
Pin 2 of the XLR connection is Mic+
Pin 3 of the XLR connection is Mic-
Pin 1 of the XLR connection is the cable shield (ground).
Mic audio is present between pins 2 and 3.
Pin 1 is nothing more than a shield and should be independently
connected to the *chassis at the jack*.
Good quality XLR cables use a *TWISTED PAIR* for pins 2 and 3.
That twisted pair is shelf shielding - particularly good for
rejecting hum. Connecting a shield in parallel with the wire
for pin 3 "unbalances" the twisted pair and makes it much
more susceptible to hum and RFI - particularly when the shell
of the 3.5mm plug/jack is not tied to the chassis/case of the
transceiver.
73,
... Joe, W4TV
On 2020-06-09 4:49 PM, Tony 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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