RS Components 245-146 User manual

A Hi-Band VHF/FM radio transmitter/receiver system
incorporating the renowned Shure SM58 hand held
microphone eliminating the need for trailing audio leads.
Available on two independent broadcasting channels.
Approved for use in the UK without a broadcasting licence
to DTI specification MPT1311, certificate no. RTD 3407.
(The frequency range allocated is specifically for mobile
radio microphones).
Contents:
¥Trantec radio microphone/transmitter incorporating
Shure SM58 microphone capsule.
¥Trantec receiver unit.
¥Receiver aerial.
¥DC power supply.
¥PP3 9V alkaline battery.
Microphone with built-in transmitter
1. Unscrew sleeve in centre of microphone barrel.
2. Check stated frequency matches receiver unit and
case label. Insert 9V PP3 Alkaline battery (supplied)
observing polarity. WARNING: Considerable damage
may be caused if the battery is fitted the wrong way.
(Replacement battery RS stock no. 591-792).
3a. Recessed on/off switch.
3b. Recessed battery status indicator.
Transmitter specification
Type: Crystal controlled wide
band VHF/FM 173.8MHz
(RS stock no. 245-146)
175.0MHz
(RS stock no. 245-152)
RF bandwidth: Less than 150kHz
Frequency stability: Less than 0.005%
RF Power output: 2mW erp
FM deviation: Typ 30kHz
Audio frequency response: 30Hz to 20kHz within 3dB
Microphone specification: Shure SM58
Battery life: 10-12 hours
Battery type: 9V alkaline
(RS stock no. 591-792)
Current consumption: 28mA typ.
Range: Typ. 100 metres
Audio distortion: Less than 0.5%
Wireless (Radio) Microphone
Stock No. 245-146 (173.8MHz)
Stock No. 245-152 (175.0MHz)
MODEL RTD3407
FREQ
SERIAL NO
OBSERVE POLARITY
9V ALKALINE ONLY
MN1604 - 6LF22 - 6LR61
-
+
-
+
3
1
Observe polarity of battery connection
for alternative style of contacts.
Figure 1

Receiver unit and power supply
Features:
¥High sensitivity effective over 100m range.
¥Low noise muting circuits.
¥Crystal controlled VHF/FM.
¥High signal/noise ratio (8 pole ceramic filter).
¥Good immunity from taxis, CBÕs, etc.
1. Attach rigid aerial (supplied) to socket on rear panel.
2. Insert 2.1mm d.c. coax socket and lead (supplied) to
15V d.c. input socket on rear panel; plug in power
supply unit to 240V 50Hz mains.
3. Check that red LED on front panel is illuminated.
4. With microphone switched off (i.e. microphone LED
not illuminated) check that the green (carrier) LED on
the front panel is also off (see noise muting
instructions if illuminated).
5. Switch microphone on (microphone LED illuminated)
and check that green LED on front panel is also
illuminated.
6. Connect audio output to power amplifier via (a) 600 ½
unbalanced 0.25 inch jack socket, or (b) 150 ½
balanced XLR socket.
Note: audio level may be adjusted on unbalanced
output only.
Noise muting adjustment
In particularly noisy environments (i.e. r.f. noise within
the operating frequency range) the internal mute level
may need to be adjusted. The need to make
adjustments will be evident if the green (carrier) LED on
the front panel illuminates before the microphone is
switched on, with possible noise on the loudspeaker
outputs.
With a small screw driver or trim tool (RS stock no. 543-434)
and with the microphone still switched off, turn the mute
adjustment trimmer clockwise until the carrier LED turns
off. (This is accessed through the small hole in the base
of the receiver unit). Do not over adjust as this will
decrease the working range of the microphone system.
Note: Make this adjustment on site where r.f. noise is
being experienced.
Receiver unit specification
Power supply: 15V d.c., 200mA unregulated
(coax socket centre pin positive)
RF carrier frequency: 173.8MHz (RS stock no. 245-146)
175.0MHz (RS stock no. 245-152)
Superhetrodyne
IF frequency: 10.700MHz.
RF sensitivity: 1µV for 20dB of noise quieting
Image rejection: Better than 90dB.
Frequency stability: Better than 0.005%. Quartz
controlled
Antenna: Detachable 1/4 wave rod
Audio signal/noise ratio: Better than 94dBA.
Audio distortion: Typ 0.5%
Audio frequency
response: 20Hz to 15kHz within 3dB.
Audio outputs: Balanced line - 150 ½, -37dBM.
Unbalanced line - 600 ½, 0dBM
adjustable
Construction: 2 piece ABS moulding
Dimensions: 6 x 6.75 x 2 inches
(150 x 175 x 50mm)
A. Balanced line 150½ audio output
B. Audio output (600½)
C. Aerial
D. 15V d.c. supply socket
E. Audio level adjust
Figure 2 AB
C D E
RS Components Issued March 1993 8516
Rear view