EARMARK VALCOMM 900 User manual

OWNER'S MANUAL
EARMARKEARMARK
EARMARKEARMARK
EARMARK
1125 Dixwell Avenue, Hamden, CT 06514
Telephone [phone]
www.earmark.com
OPERATING INSTRUCTIONSOPERATING INSTRUCTIONS
OPERATING INSTRUCTIONSOPERATING INSTRUCTIONS
OPERATING INSTRUCTIONS
FOR THE VALCOMM 900 HEADSETSFOR THE VALCOMM 900 HEADSETS
FOR THE VALCOMM 900 HEADSETSFOR THE VALCOMM 900 HEADSETS
FOR THE VALCOMM 900 HEADSETS
I DESCRIPTION AND GENERAL INFORMATION
Your new Earmark ValComm 900 Headset provides you with hands-free communication
capability. It has many features to assist in building your productivity. Earmark Headsets
are supplied in a variety of models. Before going any further, please check the name
plate label on your Headset and determine which of the below listed models you have.
I
MODEL NETWORK DESCRIPTION
VC900-HD FULL DUPLEX PAIR- VC900-HDA & VC900-HDB
VC900-HDA FULL DUPLEX HEADSET FOR USE WITH VC900-BD BASE
VC900-HDB FULL DUPLEX HEADSET FOR USE WITH LISTEN ONLY HEADSETS
VC900-HL LISTEN ONLY HEADSET... NO MICROPHONE
VC900-HH HALF DUPLEX HEADSET - REQUIRES REPEATING BASE OR HEADSET
VC900-HG REPEATING HEADSET - USE WITH MULTIPLE VC900-HH OR HL
®
REV A 08/2015
p/n 400070
SPECIFICATIONS
GENERAL
Performance specifications are nominal unless otherwise specified and are subject to
change without notice.
General Frequency Range 902-928 MHz Std.
Operation mode Duplex
Power Supply .6V NiMh internal rechargeable battery system/1800mah
Charger Output 6vdc @500ma into .5mm jack, Input [email protected]
Weight Approximately 16 oz.
Microphone Electret, k Ohm
TRANSMITTER
RF Output 10 mW
Spurious & Harmonics 75 dB
Modulation 16K0F E
Frequency Stability xxxx
Voice Compressor xxxx
RECEIVER
Receiver Circuit xxx
Sensitivity xxx
Modulation Acceptance xxx
Selectivity xxx
Spurious & Image xxx
Intermod Response xxx
Frequency Stability xxx
APPROVALS AND AUTHORIZATIONS
FEDERAL COMMUNICATIONS COMMISSION
This headset complies with Part 15 of the FCC rules. Operation is subject to two conditions: (1) This
device may not cause harmful interferance and (2) this device must accept any interferance received
including interferance that may cause undesired operation.

All the above models have certain features in common. Each has a variable rotary
volume control which is also the main power on/off switch. There is also a continuous
reading, Battery Condition Indicator Light on the back of every unit. And, with an Earmark
portable radio, you always have the ability to actuate the transmitter with a Push To Talk
(PTT) Switch or let the transmitter run all of the time.
II SETUP
As received, your new Earmark ValComm 900 Headset is ready for use in a typical,
industrial operating environment. Only a few items require your attention before you
start operations.
A. BATTERIES
Your Headset comes with rechargeable NiMh batteries. This power system should last
approximately 16 hours when fully charged. The headset should be charged immediately
when you receive it.
To recharge the headset, plug the power supply that came with your headset (see
specs on back page) into the charging jack at the bottom of the side with the microphone.
A charge session of 7-8 hours should completely charge the batteries. The LED next to
the charging jack will stay a red or amber color as long as the charger is attached and
functioning. If the light is amber, the headset is turned on... you should turn the headset
off in order to charge faster.
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E. OUT OF RANGE INDICATOR
When you are out of range of the other ValComm 900 headset in your group, you will
hear a sound in your ear that goes from high to low frequency. Immediately get closer to
the other person or base. When you are back in range you will hear a sound which is
low to high frequency.
This condition will not happen suddenly... you will have warning that you are drifting out
of range when you hear sound quality begin to degrade.
V ACCESSORIES
A. HARD HAT MOUNTS
If you need a hard hat, you should equip your ValComm 900 Headset with Earmark's hard
hat and hard hat brackets. Supplied as a package, the wide hard hat with ratchet
suspension and the spring mount headset adapters assure the best fit and comfort. This
option is not field installable. Contact Earmark for further information.
VI MAINTENANCE
A. REPLACEMENT PARTS
From time to time all devices need refreshing, especially soft parts such as headband
pads, windscreens, and earmuffs. Replacement parts are available from Earmark directly
or on our website www.earmark.com under "Order Parts". Please specify your
Headset model when ordering.
B. SERVICE
Earmark has a full time service staff ready to perform maintenance on your radio.
Whether in warranty or not, all radios are repaired quickly and professionally. Contact
Earmark for more information or go to our website at www.earmark.com/service.
Insert Charger Jack to Charge Headset

B. EARMUFFS
Your Earmark Headset comes with hypo-allergenic, noise cancelling foam filled
earmuffs. These earmuffs are specially manufactured for your ValComm 900
Headset and are fabricated with a polyurethane skin over custom foam. Washable
fabric sanitary covers are available from Earmark if desired.
C. SELECTING FREQUENCY
Your ValComm Headset provides 16 possible channels (numbers 0-15) of operation in
the unlicensed 902-928 mhz frequency band. All headsets are shipped set to channel
zero (0), but can be changed easily.
To change channels, do the following:
•Turn off the power on the headset
•Pull apart the headset cups so that you are looking into the ear cavity on the
side with the microphone.
•Find the square cutout in the guard (see figure)... you will see a square DIP
switch that has four little slide switches on it.
•Set the channel you want to one of the combinations shown on next page
using a sharp object to slide the switches.
•Turn on the headset
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B. BATTERY CONDITION
The red light next to the Volume knob is an indicator of battery condition. As long as the
LED stays lit, the battery is adequately charged. When the battery charge degrades too
much, the LED will go blink and you will hear a beeping noise in your headset. This means
you only have a few minutes of power left and should recharge your headset.
C. PTT SWITCH
The PTT (Push To Talk) switch is located on the bottom of the microphone side of your
headset (below the mode switch). Pressing it will override any other setting and allow
you to talk.
D. MODE SWITCH
The Mode Switch is between the PTT switch and the microphone. This switch selects
the two operating modes, "ON" or "OFF".
Duplex and Repeating Headsets offer a selection of Continuous Transmit (ON) and
Push to Talk (OFF). When the mode control is switched to OFF, you must press the PTT
button to talk. When in ON, the microphone is always live.
Half-Duplex Headsets do not have a Mode Control switch. They are always push to
talk using the PTT button.
Listen Only Headsets do not have a Mode Control switch nor a PTT switch. They
have no microphone and do not transmit.
Dipswitch Location in Ear Cup
Mode Switch

III THE ValComm 900 MICROPHONE
A. ARMORED GOOSENECK MICROPHONE
Earmark designs and provides only "noise cancelling" Microphones. With a noise
cancelling design, the front and back of the microphone respond differently to
outside noise energy. It's all done to give you an advantage when you have to work
and talk in high noise. The microphone's front side, the side closest to your mouth,
hears your voice up to 16 times better than the microphone's back side. That's why
it's so important to talk into the front side. At Earmark, we mark our microphones so
the side you talk into the side marked "Talk". You're always ok if you keep the Talk
side closest to you.
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Noise cancelling works best when you "close talk" the microphone. To close talk
means to keep the microphone's front side very close to your lips, within 1/4 inch.
When you keep the microphone's front side close to your lips, you'll sound great,
and your voice will seem much louder than the outside noise around you. The extra
effort required to use a noise cancelling Microphone the right way really pays off; it
dramatically improves sound quality.
Maintaining your microphone requires very little effort. Preventative maintenance is
the key to long life. First and foremost, make certain the end is covered by a
windscreen. The windscreens keeps the metallic micro-mesh guards from getting
dirty as well as reducing the effects of air noise across the microphone. When the
micro-mesh guards get blocked with dust and moisture, they block the sound energy
from getting through and make it hard to talk. Guard blockage, caused by a missing
windscreen, is the most common reason for microphone failure.
IV CONTROLS AND OPERATION
A. ON/OFF VOLUME SWITCH
This switch turns the Headset ON and provides a continuous volume control, from
min to max. Located behind the earcup, the switch is easy to find and large enough
to control with a gloved hand.
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Volume control location