From TekWiki
Jump to navigation Jump to search
Tektronix 7L13
1.8/2.5 GHz Spectrum Analyzer
Tektronix 7L13

Compatible with 7000-series scopes

Produced from 1974 to 1981


Manuals – Specifications – Links – Pictures

The Tektronix 7L13 is a 1 kHz to 1.8 GHz Spectrum Analyzer plug-in for 7000-series scopes, designed by Fred Telewski who also led the TR502 development.

From 1977 on, a modified version with coverage up to 2.5 GHz was available upon request (no official option listed in the catalog).

It is similar to the 7L12 but occupies three module bays, adds a marker function, offers resolution bandwidth down to 30 Hz, and improves sensitivity by 10 dB. It also displays the center frequency in the CRT readout as well as on a LED display.

The TR502 tracking generator is designed to work with the 7L13 up to 1.8 GHz.


Input frequency 100 kHz – 1.8 GHz (modified version up to 2.5 GHz)
Span 200 Hz/Div – 100 MHz/Div
Sweep 1 μs/Div to 10 s/Div (1−2−5), manual, external
Resolution bandwidth 30 Hz – 3 MHz in decade steps
Sensitivity −128 dBm at 300 Hz to −80 dBm at 3 MHz
Vertical scale 10 dB/Div, 2 dB/Div or linear
Reference level −110 dBm – +30 dBm in 10 dB steps
Video filters 30 kHz, 300 Hz or 10 Hz
  • Automatic phase lock
  • CRT readout of center frequency
  • UNCAL indicator
  • built-in calibrator 50 MHz, −30 dBm
  • Base line clipper



Year 1974 1976 1980
Catalog price $6,500 $7,500 $10,500
2020 Dollars $34,100 $34,100 $33,000


The input signal passes a 0 to 60 dB step attenuator, a 1.8 GHz low-pass filter, and a 3 dB isolation pad before the 1st mixer, with a 1st LO frequency between 2.095 GHz and 3.895 GHz. At spans of 50 kHz/Div and below, the 1st LO (a YIG oscillator) is fixed (stabilized by a PLL) and the 2nd LO is swept.

The 1st IF filter is 10 MHz wide, centered at 2.095 GHz. With a 2nd LO at 2.2 GHz, the signal is mixed to a 105 MHz IF, amplified, filtered again (105±1.5 MHz) and mixed down to 10 MHz (3rd LO at 95 MHz).

At the 10 MHz 3rd IF, resolution filters (300 kHz L/C, 30 kHz, 3 kHz or 300 Hz crystal filters) can be selected. The detector (discrete log amplifier) and video filters follow.

The digital frequency readout is a DVM (Fairchild 3814) working off the the YIG oscillator control voltage, not a frequency counter, which is why it needs to be calibrated before use.

Custom integrated circuits used: 155-0035-00 quad opamp, 155-0042-02 Miller integrator, 155-0056-00 sweep control, 155-0088-00 legend generator.


Display examples

Custom ICs used in the 7L13

Page Class Manufacturer Model Part nos Description Designers Used in
155-0035-00 Monolithic integrated circuit Tektronix M053B 155-0035-00 155-0116-00 quad op-amp Mike Metcalf 3110 3S7 3T7 4010 4011 4012 4013 7L5 7L12 7L13 7L14 7L18 7S11 7T11 7S12 S-6 1461 4602 P7001 613 653
155-0042-02 Monolithic integrated circuit Tektronix M018 155-0042-00 155-0042-01 155-0042-02 155-0042-03 Miller integrator 5B42 7B53A 7S14 7L12 7L13 RG501 Telequipment D63 Telequipment DM63
155-0056-00 Monolithic integrated circuit Tektronix M042E 155-0056-00 sweep control Val Garuts 26G1 26G2 26G3 314 4701 5B10N 5B12N 7L5 7L12 7L13 7L14 7L18 7S14 5S14N RG501 Telequipment D63 Telequipment DM63
155-0088-00 Monolithic integrated circuit Tektronix M167 155-0088-00 custom legend generator Mike Metcalf Roger McCoy 7D15 7L13 7L14