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Portable Mikroport Receiver Model T 203
The receiver Ela T 203 is a smaH and light pocket FM-receiver for the Mikro-
port wireless microphone transmitters SK 1005, SK 1008 or SK 1007. Two fixed
frequencies are provided, 36.7 and 37.1 MHz, other frequencies are optional.
The 7 transistor circuit is powered by a 9 V battery or a 7.5 V NC-battery.
A supply voltage below 6 volts should be avoided because it would result in
deviations of the local osciHator frequency and consequently distortion of the
audio signal in the demodulator. The on/off switch is combined with the volume
control,
located at the top panel. The adjustable audio output voltage of
approximately 1 volt can be taken off a miniature phone jack on the top panel
which contains also the channel switch and the threaded antenna mount.
There is a choice between a telescopic antenna Model ETA 203 or a shoulder
strap antenna.
A range of appraximately 300 feet can be achieved in an open field with the
transmitter SK 1008, when applying the telescopic antenna. This range will be
reduced to about half with the shoulder strap antenna.
The circuit is constructed
as a printed circuit panel, carrying the various
shielded stages as complete sub-assemblies. They are the mixer stage, the
first, second and third IF-stage 107 MHz and ratio detector and a two-stage
AF-amplifier.
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Technical Data
Input, unbalanced
. . . . . . . . . . . . .
Output,unbalanced. . . . . . . . . . . .
Output voltage at 40 kcps frequency deviation
and more than 5 micro-volts e. m. f. from
the aerial.
. . . . . . . . . . .
Audio frequency range
. . . . .
Deviations from the rated frequency response
(de-emphasis 50 microseconds)
.....
Harmonic distortion at 40 kcps frequency
deviation and 200 microseconds e. m. f. fram
the aerial for 1 volt output voltage
Signal-to-noise
ratio
at 40 kcps frequency
deviation and more than 20 microvolts e. m. f.
from the aerial.
. . . . . . . . . . . .
Receiving frequencies . . . . . . . . . . .
26 db signal-to-noise ratio at a frequency
deviation of 40 kcps . . . . . . . . . . .
Neighbouring
channel selection at 0.4 mcps
detuning . . . . . . . . . . . .
Powersupply . . . . . . . . . . .
:)
Current rate (for 7.5 volts) . . . . . . . . .
Operating period (for intermittent use)
Dimensions. . . . . . . . . . . .
Weight (including battery)
Acceptance No. of the FTZ. . . . .
for 60 ohms source
impeda.nce
source impedance 1 Kohm
nominal load
2 Kohms
1 volt, adjustable
100. . . 15000 cps
;;::;
:t 2 db
;;::; 3 %
> 50 db
36.7 and 37.1 mcps
from 2.5 microvolts onwards
approx. 50 db
9 volts battery, e. g. Eveready
No. 226 or 7,5 volts DEAC-
accumulator,
capacity 150 mAh
12 mA
battery apprax. 20 h, DEAC-
accumulator approx. 10 h
33 x 86 x 120 mm
approx. 350 9
M 371/62
7
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