I just picked up a nice old 535A with four plug ins, one of which is the
1L-20 10Mhz - 4 Ghz Spectrum Analyzer.

Can anyone point me to a tech manual for the 1L-20? It seems to be working,
but I cannot generate any "picket fence" frequecy markers on the display.

73,

Chris Bowne, AJ1G
Stonington, CT