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5. Technical Description
5.1,
Mechanical
The exciter is built oti a rugged zitlc plated and passivated iron
A'cAbiAffAfhth
=a -4iA--in:-:ie--5;a:as-i; 8:parate screeT=EF caT=5|z4A Sad rm
which become accessible after removal of the respective lids. Board
chassis .
The excicer coutains f ive plug-in boards
is mounted behind the front panel. This board and the rocher-
t=ld-EEbeconeacce88iblewheti-thefrotitpatieli8tiltedfon.ard.
This is possible after removal of the two upper screws ia each aide
fixing the front panel.
EE
5.2.
5.3.
5.3.1.
Circuit I)escri
Gerieral
=::::::t:€i:::::its:a:::n=:i::::o:h:£h::Si:=::teife°ap::eatfi.
:ir::i::::;:n2fr,i=:::::%:::::::Lfi#:So:hi:4:*::=mL
For cotlvenience in this seccioti and on the circuit diagran8 the
pref ix is omitted except where Cbere i8 a risk of ambig`lity.
f=,:i:c:;::i:E:=o::dd[ffieda=:c:h::::e=go#:::ga:nb::::e:_the
printed circuit boards of which the exciter is coaposed and circuit
diagran9 of the individual circuit boards. The block diagran8 on pages
8-to page 8-illustrates the operation of the exciter.
circuit S-
al Path E 5002
The signal path i8 contained on boards
signal, having passed an input 9electorT=a-a coap-ie8sor. i8 converted
to a 1.4 rmz double sideband Signal by mixing t`rith a 1.4 mz signal
derived from the mster ogcillator. The upper 8ideband i8 remved in
a crystal filter and the louer 3ideband is applied to an aplifier,
the gala of which i3 set in accordance trith the aiode selected. At tbe
output a 1.4 mz Signal of apprapriate level for carrier re-insertion
A and RE . The AF input
is applied in the tDodes A3A and A3H.
-.2.!:::;i::;f;i::;:;::e|¥eg::;l=::;:::::::;::t=e:::inan;::::::=EE.
I.4 mlz lower gideband signal i8 cotiverted in the 1.4 to 38 Hz ai=er
to a 38 rink LSD signal by nixing uith a 36.6 mz 8igml from the
36.6 mz VCO. The Signal is filtered in a crystal I ilter to remve
undesired mixing prod`ict8.
Tbe Signal is converted to a 0-30 mlz upper Bideband Signal in the
38 to 0-30 mz mixer by mixing rich the 38-68 mz sigrLal from the syTi-
::=;:::¥::i;rT=:in¥a:a.::e:h::e¥i::::e:h:n:i=:it:Sth±!!f¥d
Co full pover level. Before the Signal i3 fed Co the Cranonitcer it
passes the step atten`iator controlled froo the Pour Bvitch.
5-I
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