Today, my new attenuator arrived. The old home-brew unit wasn’t really suitable to do measurements on 150 MHz and above. This Bird is suitable till 6 Ghz and has a -30 dB attenuator (the old one had a -40 dB att.).
The type is 100-SA-NFM-30 and documents can be found on the Bird website. By accident I found this one on Ebay for only $50.- including shipping costs and taxes.
Now, the only thing missing in my lab is a VSWR-bridge. I’ve ordered the Rigol DSA-VB1020 and this should arrive soon.