Williams Sound PPA R7-4NA User Manual
Personal PA
Williams Sound
®
Helping People Hear
EAR/CHG
V
olume
1
On/Off
Volume
Control
Earphone
Jack
™On∫ Indicator LED
Channel
1
2
3
4
Channel Switch
Williams Sound
Description:
The Personal PA R7-4NA is a four-channel wide-band re-ceiver pre-tuned to frequencies 72.1, 72.5, 72.9, and
75.7 MHz. It features a channel select knob, volume control on/off switch, and an earphone/charging jack. Built
in an impact resistant case, the R7-4NA is field tunable and will operate up to 32 hours with a single 9V nonrechargeable alkaline battery.
Specificaitons:
Dimensions & Weight: 3-5/8" L x 2-3/8" W x 7/8" H
Color: Gray
Battery T
Battery Drain: 14 mA, nominal
Battery Life: 32 hours with Eveready 522,
FCC ID: CNM R7, CNM R74Y
Operating Frequency: Pre-tuned, adjustable, 72 MHz-76 MHz *
Intermediate Frequency: 75 KHz
FM Deviation: 75 KHz
De-Emphasis: 75 uS
AFC Range: ± 300 KHz
Sensitivity: 2 µV at 12 dB Sinad with squelch defeated
Squelch: Squelches at 10 µV for minimum
Input Overload: 20 mV
Frequency Response: 100-10 KHz, ± 3 dB
Signal-to-Noise Ratio: 50 dB at 10 µV
Receive Antenna: Integral with earphone/headphone cord
Audio Output: 250 mW, max. at 16 Ohms
Output Connector: 3.5 mm mini phone jack, also serves as a charging jack
Earphone: Earbud-type with foam cushion,
R7-4NA Channel Selector 4-position, rotary switch
Warranty: 5 years, parts and labor
ype:
Wideband Receiver, Model PPA R7-4NA
(92.1 mm x 60.3 mm x 22.2 mm);
3.2 oz (90 g) with battery
9 V
olt, Eveready 216 Carbon,
Eveready 522 Alkaline, or
BA
T 003 NiMH Rechargeable
R7-4NA T op
6 hours/charge with BAT 003
50 dB S/N ratio
for rechargeable battery
3.5 mm plug, 32 Ω (Other styles available)
90 days on cords, earphones, heaphones, batteries,
and other accessories
R7-4NA Front
™
NOTE: SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE!
©2005, Williams Sound Corp. MCAT 0
37A
1
Personal PA
Williams Sound
®
Helping People Hear
Bid Specs:
The receiver shall be housed in an impact resistant poly-propylene case with a hinged battery door that does not
separate from the receiver. The receiver shall be a body-pack style with a wrist lanyard.
The receiver shall have a 3.5 mm mono earphone jack and accommodate low impedance mono earphones, headphones and neckloop telecoil couplers. The 3.5 mm jack shall also serve as a charging jack for rechargeable batteries.
The receiver shall operate on one 9 volt battery and shall have a power LED next to the earphone jack. The receiver
shall have a combination on/off rotary volume control and a four position switch to select between frequencies 72.1,
72.5, 72.9, or 75.7 MHz. These frequencies shall be pre-tuned and are adjustable by means of internal tuning coils.
The receiver shall receive FM signals in the 72-76MHz audio assistance band with 75 µs de-emphasis. The receiver
shall provide a maximum output of 250mW at 16 Ohms with an earbud-type earphone. The system electrical frequency response shall be 100Hz to 10kHz,
shall accept wideband deviation of 75 kHz p-p.
The receiver shall be covered by a five-year parts and labor warranty, excluding earphones, headphones, batteries and chargers.
The receiver shall be the Williams Sound Corp. model PPA R7-4NA.
Wideband Receiver, Model PPA R7-4NA
± 3dB and the signal-to-noise ratio shall be 50dB at 10µV. The receiver
™
NOTE: SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE!
©2005, Williams Sound Corp. MCAT 0
37A
2
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