I would like to present you with a series of loose blog entries showing some of my vintage test instruments and tools.
I start with the Schwaiger SAP 100 "Satellite System Test Set". I own one complete set and then a second SPG 101 unit. Both were purchased second hand some years ago at eBay for little money.
The core of the set is the SPG 101 unit, which is a neat little device: it is fed by just one single 9V battery and has an ON/OFF switch. What it does is simple: it emits a test pattern composed of a grid at exactly 11.288 MHz. Point it at an LNB and you can receive this fake analogue transponder with any analogue receiver or field meter.
The goal is to test if the LNB is working properly or not. Clever!
- ZNA234E: This IC is a pattern generator. It can be used to produce crosshatch, dot and greyscale test patterns. Datasheet HERE.
- HFC4011B: This IC is a Quad 2 Input NAND Gate. Datasheet HERE.