3-6 Self-grounding Microphones
HM-148G / HM-148T
grounding microphones are designed to do without
connecting wires to the vehicle’s ground. The self-
grounding is enabled by a newly designed
microphone hanger.
HM-148G
(Plain type)
HM-148T
(DTMF type)
Features
1. Self-Grounding
Availability of Hanger Actions
“Hanger Action” functions can be used without
connecting the microphone hanger to the
vehicle’s ground, which makes the installation
work easier.
Hanger Type Image
GND
connection
HM-148
G/T
HM-148
Availability of Hanger Actions
The available On-hook/Off-hook hanger actions
are shown below. ( : Available N/A : Not
available)
When the HM-148G/T is put on the new self-
grounding hanger, the microphone’s metal parts,
having no conduction between them in normal
condition, short-circuits. Thus, no ground wiring is
required The radio detects it also as
OLD
Self grounding
supplied with
the HM-148G/T
Not
Connected
*
N/A
Non-self
grounding
supplied with
the transceiver
Connected
Not
A
2. “Hot DTMF” for HM-148T
The DTMF code will be sent out when pressing a
key without a PTT operation.
*This function can be de-activated too.
Hanger Action (On Hook / Off Hook)
The radio detects it also as
* Self-ground
NOTE
• HM-148G #18 EXP / HM-148 #19 EXP includes a
self-grounding mic hanger. (The former versions do
not include the mic hanger, so it’s necessary to
Hanger Action (On Hook / Off Hook)
There are two “Hanger Action” functions
available. It can be pre-set ON or OFF in the
cloning software.
1. Off Hook Monitor function
When you pick up the microphone out of the
hanger, the radio automatically turns to the
• When you use other microphones than HM-148G
/HM-148T with the new microphone hanger,
the hanger must be connected to the vehicle’s
ground for using hanger action functions.
• When you use the HM-148G/HM-148T
23
2. On Hook Scan function
When you put the microphone on the hanger and
the radio automatically starts scanning.（The
radio continues to be on the scan mode except
when you talk on the radio.）
with an old, regular type microphone hanger,
ground wiring is still required.
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