Sencore CB42 User Manual

.. v SIGNAL
Pit. 28-Typioll ~~j~r .enailiuily CUrol" .nOW In,
EIA definition of ten,itilJity.
II
III
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.1 1 11'1 N"Vf 10
29-ReetlVf:r llelllitillit)' curve, with ..no ....
cur~ increalN by 10 dB.
The graph in Fill:.29 show. what happena if the noiae
curve shown in Fig. 28 ia incre~ by 10 dB. The
lCl'aph show. that the point where the t...o lines CI'OIlI
is the same point that g&W! the .ensitivity figun! in
the pre<.'ed.ing grapb. This is esactly .. hat the CB42
doea. The nobe output is ir.u sed by 10 dB. 110 all
that is nee "ry is to find the point ... bere the S+N
and N ficure read the aame on the DIGITAL
READOtrr.
Tbe CB42 IIimpliliea the ElA WIlIitmty teat m two
ways. Wbea the SIN buewn II; .. tleed, the .eru:itiYity
of the AUDIO WA'I"l'S functiOfl is irw::z Ii by
to dB. Tb..iI eliminate the need of. Dedbel rftIdinl
meter. Tbe bIltt<xl a1Io MDl.oote- modulation from the
RF ~ M) only the oeUe ftcure ill beiDa; If!llented .
...-mnTY 1QT .. aMccc0,-rrrrr
o
gol---l4--l+
e
u",,,
........ ~ ...... -
A typiCll] sen~tivity curve iI shown in Fig.28 . As the
gnph .hows, the noiee figure (daahed line) increases
with the input Iign.al until tht1 AGe cifl::uit beli(in& to
reduce the receiver', pin, ,t which point it begina to
'-loft. The Signal Pl~ Nolle (S.NI curve builds
more quickly with an in~ input Jign&l. and abo
IeYeb off due 10 the limits of the ~"e!"'5 audio
detect« circuit. The EIA Sensitivity is the point
where these two lines ~ 10 dB apart, or tJwo (S+N)
figure is to limn the rN) fWu~.
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MICROVOlT OUTPUT
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Fi6. Jo-<:onrrol wtup (or drtnminin8 norltler .e1Uitwity.
29

Sencore CB42 Specifications

General

Brand	Sencore
Model	CB42
Category	Measuring Instruments
Language	English