Pulse Modulation

The 2024 does not have a internal connection from the low frequency generator to the PM modulator. PM Manual page

To overcome this problem, connect the low frequency generator en the external modulator with an bnc cable. this works for most of the 2024. some of them need additional hardware to generate the correct levels. with older machines this is the external Pulse modulation input. With newer machines this is Ext Pm / FSK input.