•
to zero beat. In the absence of a standard oscillator, the following technique
Lan be used. Using a standard TV receiver tuned to a broadcast station,
adjust the discriminator circuit for an absolute zero output indicating that
the discriminator is tuned correctly. Turn the Television Analyst on and obtain
a picture and sound carrier on the TV receiver and adjust L-401 the 4.5 me
oscillator adjustment in the Television Analyst for exactly zero output on the
TV receiver discriminator.
R.F.-I.F. OSCILLATOR COILS. These coils are factory adjusted for the
correct frequency and should not normally have to be re-adjusted. If the
occasion does arise an accurate radio frequency signal of the correct frequency
must be available so that the signal from the Television Analyst and this
signal can be adjusted for zero beat. It is possible to approximate this adjust
ment by tuning a TV station of the correct channel in on a TV receiver and
feeding the Television Analyst R.F. signal in on the same channel. The video
control is turned to zero. The zero beat is then obtained by adjusting the
appropriate slug in the Television Analyst until zero beat is visually seen on
the receiver screen. To adjust the I.F. coil requires that the I.F. tuning
selector be set to 40 me and the I.F. coil tuned to this frequency using an
external unmodulated standard signal generator. The high band channels cover
7 and 8, and 12 and 13. If it is desired to tune one of these channels to a
different frequency, the previously outlined method can be used since the
range of adjustment of each slug covers approximately two channels. It is also
possible to write in pencil on the silver area of the channel selector dial tne
new channel to which it has been tuned. The matte surface covering this
finish permits writing with pencil, and also erasures.
The slugs for the coils of channels 6, 7, 8, 12 and 13 may be reached from
the top by inserting an alignment tool_ (General Cement #8606 or equivalent)
through the slug located directly above the coil to be aligned. The hex head of
the alignment tool must go completely through the top slug and engage the
bottom slug to be tuned. This same alignment tool is used to adjust all
other coils in the Analyst.
Beam Current
The Beam Current control (R-201 ) is adjusted so that the cathode _current
of the 5BKPV1 is 75 microamperes.
47
Содержание 1076
Страница 2: ...Figure 1 Front Panel Controls...
Страница 61: ...TMOtl I...
Страница 62: ...Tll10 ff I...
Страница 63: ...Tll I Off I...
Страница 64: ...T Off...