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HEWLETT-PACKARD


JOURNAL
T E C H N I C A L I N F O R M A T I O N F R O M T H E - d p - L A B O R A T O R I E S
VOL. 4 No. 9-10



JLISHED BY THE HEWLETT-PACKARD COMPANY, 395 PAGE MILL ROAD, PALO ALTO, CALIFORNIA MAY-JUNE, 1953




The -hp- TV Monitor

MANY television engineers who have Three panel meters on the equipment
been associated with f-m broadcast monitor the frequencies of the visual and
stations have worked with the -hp- Model aural carriers, and the percent modulation
335B f-m frequency monitor and modulation on the aural carrier with 100% modulation
meter.1 That the 335B was a successful de equal to 25 kc deviation. All indications are
sign is indicated by the fact that it was used presented simultaneously. The monitor can
in more f-m stations than all other monitors be used with any one of the TV channels in
combined. Among station personnel the either the VHP or UHF bands. The circuit
monitor has been popular because it oper arrangement also accommodates stations
ated accurately for extended periods with that may have offset carriers. Full provision
out adjustment. is made for the use of a remote over-modu
The same design approach used in the lation lamp as well as remote indicating
335B has been used in the new -bp- Model meters. All operating adjustments can be
335E aural and visual monitor for television made on the front panel of the monitor.
stations. The 335E uses the pulse-counter Although the 335E is primarily intended
type frequency meter that proved popular to indicate the percentage modulation of the
in the 335B because of its simplicity and sta aural carrier and to monitor the frequencies
bility. Like the f-m monitor, the TV monitor of both carriers, it is also valuable as an aid
is small in size, being only 12