My R&S signal generator (SMS) is a very nice generator but output power is limited to +13 dBm and sometimes you need more ….
For my 144 MHz PA, I wanted to have a separate power meter to monitor outgoing power. Off course I could have bought a BIRD with all slugs but building one yourself gives a more satisfied feeling.
A VSWR bridge is a very nice add-on to a Spectrum Analyzer when you want (or need) to measure reflection loss of for example an antenne or load (termination).
The VSWR bridge fits mechanically on a DSA815 Spectrum Analyzer.
After being active with ATV on several bands with multiple video sources, I felt the need to have a video switch. With this I do not have to plug one video source to another anymore, it saves time especially when working in a contest.
A power meter is almost a necessity when building your RF equipment. Since I did not have one I decided to build one myself.