HAMKit VDAS (Video Detect and Audio Squelch), is a small board that simply detects video sync (taken from an ATV receiver for example), and then un-mutes the through audio only on a valid video source. Size 45mm x 20mm x 5mm (excluding BNC)
These boards can be easily hung on the back of an ATV receiver. Great for receiver such as the Comtech and saves the unwanted noise on no signal. With the increasing use of the FPV 5 GHz video receivers for ATV, the HAMKit VDAS boards make a good companion.
An on-board regulator allows DC input voltages from 5v to 16v, making this ideal for portable, mobile, repeater, home and FPV use.
A squelch tail (delay), of around 1 second holds up the SQL/PTT line during noisy signals. The timing can be easily changed through a 0805 resistor.
An additional feature of the HAMKit VDAS board is that it also has a squelch detect FET output for other uses such as repeater TX PTT, LED etc.
To use, simply feed in a composite video signal and upon correct sync being sent, then the SQL/PTT output will go low, the on board LED will light and Thru Audio enabled. Changing a solder link, the output can be inverted,if required.
Connections are taken out to the mini JST 6 pin socket and supplied cable.
4-SQL Output (LED, PTT, Relay etc)
3-Video In (parallel to the BNC input)
1-+6.5v to 16v DC In
The BNC connector can be directly exchanged for an RCA version, if required, as the design includes dual mounting holes on the board to accommodate different manufacturers.
The board is designed to fit perfectly inside a Hammond 1551USB2TSK USB Case (supplied).
All that is required is a hole for the BNC or RCA connector.
In the Kit:
- 1 x HAMKit VMAC PiHat PCB (SMT Populated)
- 1 x BNC PCB Mount
- 1 x JST mini 1mm 6 pin cable 150mm
- 1 x Hammond 1551USB2TSK USB Case
The User Guide is a dynamic document and the latest revision and datasheets can be downloaded here
Our new Wiki pages will continually expand with useful information and code examples.
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International tracked shipping only £10, per order (not including any local taxes).
International Priority Shipping can be provided at an additional cost, on request.