Hi John,
Both the BB60A and BB60C function as a spectrum analyzers down to 9kHz, but software limitations prevent the BB60C from being currently used in HDSDR down to 9kHz. We no longer sell or manufacture the BB60A, but I do know they show up on Ebay occasionally. Specs for the BB60A are at the bottom of this document, https://productbundlesdemo.kinsta.cloud/sigdownloads/BB60A/BB60A-User-Manual.pdf
The BB60C improved on almost all RF performance metrics compared to the BB60A. Might be worth comparing them to ensure it will fit your task, BB60C specs here
https://productbundlesdemo.kinsta.cloud/sigdownloads/BB60C/BB60C-User-Manual.pdf
Regards,
A.J.
