Back in the seventies and the last one today 2017

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Fast Tick Sound

Calibrating the Sound Card with a Time Standard Broadcast Station.

Slow Tick Sound

Vertical lines (slant) before calibration.


Rx calibration


Set the radio to a Time Standard Broadcast Station. Freq. 4.995MHz or 9.995MHz USB, and wait for the slow or fast

tick sound (be patient).

To help with the alignment, the green vertical line can be moved by pointing the cursor to the left side of the white bar, and then select mouse right click.

Start this adjustment by clicking Adj button on the Misc tab in MMSSTV Setup.

Remember that auto slant must be turned off.


After Rx (Clock) calibration, Tx Offset can in most cases be

set to 0.0Hz


Image slant adjustment (ke5rs)

Vertical lines after calibration.

Setting up the Transmit Sound Card Sample Rate


Consult a SSTV friend who you know has a perfectly calibrated Rx Clock.

(See Calibrating the Sound Card with a Time Standard).


1. Let your friend turn off "Auto Slant"

2. Send a picture to your friend.

3. When your friend has received your picture, he/she must select the "Sync" tab.

and then press the "Yellow smiley" button.

4. Your friend can now give you a "Correction Factor" and pass this number on to you.

5. You should select the "MISC" tab, and enter this number under the "Tx offset" field, using the OPPOSITE sign. i.e. if the correction factor is +0.20 then you would enter -0.20 If the correction factor were -0.20 then you would enter 0.20


Or you can do this!

Standard MMSSTV cloc freq. = 11025 Hz

After my Rx calibration = 11024.96Hz


11025.00 Hz

-11024.96 Hz

Write 0.04 Hz in Tx offset

My settings in MMSSTV

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My MMSSTV Setup + HRD Logbook, MMSSTV RX Viewer and MMSSTV Sync Viewer.



Clock timing +-

SSTV from the sixties