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OSD-SSM: On-screen display signal strength meter




OSD-SSM is an on-screen display overlay board with analog to digital circuitry which continuously converts incoming ATV receiver AGC circuit voltage to a 0% to 100% signal strength bar graph. OSD-SSM installed at an ATV repeater site is a valuable resource because users get instant and accurate feedback of what their incoming signal strength is. While watching OSD-SSM’s self-generated bar graph screen users of cross-band ATV repeaters can rotate their transmit antenna for maximum signal strength. Users of in-band ATV repeaters can also benefit because of OSD-SSM’s ability to hold the incoming reading. By keying their ATV transmitter, sending a command to have OSD-SSM hold the reading, dropping their transmitter, and switching to the OSD-SSM video source, users can see their signal strength. Another option is to have other hams monitoring the repeater give signal strength readings over the FM calling frequency. OSD-SSM can also be used to help identify interference as well a physical obstructions between the user and repeater.


NTSC version. PAL version.


  • Dimensions: 3 1/4" x 2 1/2" x 1/2"
  • Weight: 1.0 oz.
  • Input voltage: 8.0 to 14.0 volts DC (70 ma max.)
  • Operating temperature: -10 C to +70 C
  • Video levels: 1 volt peak to peak
  • Video impedance: input 75 ohm, output 75 ohm resistively terminated
  • CH1 input: 0 to 10.0 volts DC (2.44 mv resolution)
  • CH2 input: unused


OSD-SSM is a very accurate digital voltmeter which scales a specified voltage range to a 0% to 100% bar graph. The voltage range (e.g. 6.5 to 3 volts) and direction (i.e. increase in voltage indicates decrease in signal strength or increase in voltage indicates increase in signal strength) must be calibrated for a specific ATV receiver. The calibrating process is simple and only needs to be done once. The information is stored in non-volatile memory so even with loss of power the information is retained.




To calibrate OSD-SSM for a new ATV receiver perform the following steps:


  • Power off OSD-SSM and remove jumpers J1 and J2
  • Attach the ATV receiver AGC S-Meter output to OSD-SSM CH1 input
  • Apply power to OSD-SSM
  • On screen you will see: P0 > J1:
  • With NO incoming ATV signal insert J1 then you will see the P0 (no picture) voltage appear
  • On screen you will see: P5 > J2:
  • With a strong incoming ATV signal insert J2 then you will see the P5 (snow free picture) voltage appear
  • After 5 seconds OSD-SSM will begin normal operations


Once calibrated OSD-SSM will continuously display on-screen ATV receiver signal strength and voltage. OSD-SSM scales the bar graph percentage based of the P0 and P5 voltage calibrations. During normal operation jumper J3 and J4 affect how OSD-SSM behaves (see below).

Jumper Action
J1 P0 (no signal) calibration

Leave closed (inserted) during normal operation.

J2 P5 (snow free picture) calibration

Leave closed (inserted) during normal operation.

J3 Text overlay method

closed (inserted) - self generated blue screen

open (removed) – overlaid with incoming video source

* note: OSD-SSM cannot overlay text on a snowy incoming video source.


While the jumper is closed (inserted) the last signal strength reading will be displayed.


Warranty & Service:

If the product fails to perform as described in our product description or specification, within 90 days from the date of shipment to the buyer, we will repair or replace the product and/or accessories originally supplied. Failure due to improper installation, misuse, abuse or accident is not covered by this warranty. Incidental and consequential damages are not covered by this warranty.The buyer must obtain a Return Material Authorization by calling (248) 588-4400, and shipping the defective product to Intuitive Circuits, 3928 Wardlow Ct., Troy, MI 48083, freight prepaid. After the warranty expires, we will promptly supply an estimate for the repair cost.


NTSC version. PAL version.


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