The VDA-60 Video Display Analyzer is a multi-function unit which enhances the utility of the MSR-902 and oscilloscope. It provides the following functions:
- RASTER: Generates a "falling raster" or television signal.
- SYNC: Variable frequency source to externally synchronize an oscilloscope.
- TDR: Two pulse signal formats for time domain reflectometry measurements.
- VIDEO: Wide-band, high-gain video amplifier.
- DC OFFSET: Variable DC offset for oscilloscope input.
This is a series of pictures and notes for a Micro-Tel Corp. VDA-60 Video Display Analyzer (Ser. 177) found at a hamfest for $5 (!).
I'll probably end up donating it the Crypto Museum, but I wanted to document as much as possible. The unit appeared to have some work done to it, with U2 replaced with a SK9144. The date codes on the ICs are all from the early 1980s.
It look surprisingly simple. At least a quarter of the board is taking up with the power supply (+/- 18V, +/- 12V, +/- 6V, 5V).
The is a DIP switch, but it function is unlabeled.
Micro-Tel VDA-60 Raster Analysis "van Eck" System For sale ad.
Kaiser RAS-515A Raster Analysis System
U18 LM320T-12 (-12V) U17 LM340AT12 (+12V) U16 7806 (+6V) U15 7918 (-18V) U14 7818 (+18V) U13 CA3023 U12 NE555 (555 timer) U11 7805 (+5V) U10 74LS122 (retriggerable multi-vibrator) U9 LM555 (555 timer) U8 7906 (-6V) U7 CA1458 (general op-amp) U6 CA555 (555 timer) U5 LM741 (general op-amp) U4 LM741 (general op-amp) U3 CA3080A (transconductance amplifier / multiplier) U2 SK9144 (replaced - high-speed op-amp) U1 CA3080A (transconductance amplifier / multiplier) Q5 = 2N2270 (NPN) Q4 = 2N2905 (PNP) Q3 = 2N3906 (PNP) Q2 = 2N3904 (NPN) Q1 = 2N3904 (NPN) SYNC - FREQ = 100 kΩ multiturn DC OFFSET - LEVEL = 10kΩ multiturn VERT - FREQ = 10 kΩ SYNC - LEVEL = 10 kΩ VIDEO - LEVEL = 10 kΩ TDR - Z = 1 kΩ TDR - BAL = 500Ω |
The CA3023 appears to be setup as a stand-alone video signal amplifier, with VIDEO IN/OUT connection on the rear panel.
