Keysight ENA & PNA-L Series of network analyzers are the recommended replacement products. The ENA Series covers the frequency range of 300 kHz to 8.5 GHz, and is available in 2, 3 and 4 port models. The PNA-L Series offers the key features of the RF PNA and is code-compatible with the RF PNA. The PNA-L Series covers the frequency range of 300 kHz to 50 GHz, and is available in 2 and 4 port models.