The Tektronix TR502 is a 1.8 GHz tracking generator plug-in for the TM500 system.
The TR501 and TR502 are essentially the same instrument with the exception of the output attenuators and logic interface in the TR502, which adds dot marker support for the 7L13 via the TRACK GEN LOGIC connector.
- Tektronix TR502 @ barrytech.com
- TekScope Vol. 7 No. 5, 1975 p.11+: Fred Telewski, A high-stability 100 kHz to 1.8 GHz tracking generator