There’s a transformer for the linear supply, through-hole components, and an Intersil frequency counter on a chip. Everything is easy to get to and large enough to see.

But there were other looks for test gear back in the day, as this frequency counter with a readout using moving-coil meters shows. We have to admit to never seeing anything like [Charles Ouweland ...

Description: Measurement range: DC to 3 GHz Input A/B (BNC): DC to 200 MHz Input C (SMA): 100 MHz to 3 GHz Input impedance A/B: 50 O or 1 MO (switchable), sensitivity 25 mV Input impedance C: 50 O, ...

Description: STEMlab 125-14 X-Channel System is designed for applications that require multi-channel RF signal acquisition and generation. It enables the user to ...