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Connect the transceiver to a
dummy load.
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Turn VOX OFF. Turn speech
processor OFF.
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If your radio has a MONI function
turn it ON.
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Turn RF PWR full clockwise for
100 watts output.
-
Adjust MIC gain control for 100
watts peak output.
-
Connect the interface cables and
turn the SSTV gain control full clockwise.
-
Next adjust the sound card audio
output for 100 watts output. In this example I am using ChromaPix software.
First click on Settings, then click on preferences, then click on the SSTV
TAB, Check Use PTT, then select PTT COM #1 and last select USE RTS for PTT.
Now click the OK button.
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You can make the following
adjustment either by loading a picture and clicking transmit or you can
click on tab 2, set the test tone for 5-10 seconds, click on 1200 Hz button.
In either case your transmitter should key on and you should see RF power
output.
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Now you want to right click on
the little speaker symbol at the bottom right edge of your windows 95/98
screen, which should open up a window that says "Open volume
controls." Click on Open volume controls and you will see several gain
controls. Adjust the "Volume Control" slider so that you have 100
watts RF power output. Set the Line Input control for Maximum gain.
-
You are now ready to transmit
SSTV pictures. You want to always set the SSTV gain pot on your interface
box to run 50 watts RF output. I have found that this adjustment changes a
little as you change bands. Most all HF transceivers are not rated for 100%
duty cycle and SSTV is a KEY DOWN mode.
-
When operating SSTV
on the HF bands..
-
Don't use the audio speech
processor, turn it OFF.
-
Don't use the transceiver VOX
circuit to key the transmitter.
-
Don't run full RF output power,
adjust output level to 50%
