> A capacitor in series with one side of the balanced line.
First, a dynamic mic element as is found in the PR-781 is neither
balanced nor unbalanced. That is determined by the external
connections (the input circuit to which the mic element is
connected). I know of no current amateur transceiver that has a
truly *balanced* microphone input. However, professional and
semiprofessional audio mixers (as well as "effects processors",
microphone equalizers and mic preamps) often have balanced
microphone inputs.
Second, a capacitor is not needed with the Elecraft K3/K3S - one
simply needs to *TURN OFF BIAS* (MENU:MIC SEL and tap #2).
The capacitor is only required for "Brand I" radios in which one
can not turn off the bias.
73,
... Joe, W4TV
On 2020-06-10 10:05 AM, Gil Drynan wrote:
The PR-781 does not like the DC bias supplies from many newer ham radios.
A capacitor in series with one side of the balanced line. Heil offers a
specialized cable for three pin XLR mike to the mike jack on front of
different brands of transceivers. Contains the capacitor as required.
Works for me.
Gil W7GIL
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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