As you can see I have four Virtual Com Ports. Some are
needed to run Power SDR other have other functions. What we need is a Com Port
to tell the Flex to key a Ptt Line. From Power SDR Cat Control I have chosen
Com9. From the setup for com Ports the Pair is Com8 and Com9. Now with MMSTV we
us the opposite Com Port and that we use is Com8. See picture from MMSTV setup.
Next we need a pair of Virtual Audio Ports. See
SDR setup Audio VAC1 setup the way I have it also from MMSTV From
MISC pull down set the Sound Card, In and out Audio Cables at
bottom of screen tick ok.
Close down MMSTV
Make sure the rig is in DIGU mode.
Reload MMSTV 20 meter frequency is 14.230 and 14.233
To adjust sound card tune radio to WWV from the above picture
lower left side tick on the Adj box
In SSTV, the discrimination of the clock appears as a slanted
image. For MMSSTV, you are not required to have the absolute and exact clock
frequency value (e.g. 11025Hz). But it is important to get MMSSTV informed on
what the frequency of your soundcard has. In normal situations, you would only
have to adjust the slant by using the Sync window. If you want to calibrate your
soundcard very accurately, listen to the standard radio or fax wave.
1) Go Option, Setup, Misc page, and push Adj button.
2) Receive standard radio wave (e.g., WWV and JJY).
2a) I found a full list of stations to tune into
HERE or copy and past: http://www.smeter.net/stations/hf-time-frequency.php
3) Tune into the tick sound.
4) Continue listening to the sound for a while. You have a
5) Click the upper point of the line.
6) Click the lower point of the line.
You could use FAX broadcasting instead of WWV or JJY, but be
sure it has exact timing. Refer to the MMTTY help for details. If your soundcard
seems to have different clock sampling frequencies for TX and RX, adjust the
offset frequency with the following procedure.
1) Adjust the slant in RX.
2) Go Option, Setup, and TX page. Select External in the
3) Connect the Line-out to the Line-in of your soundcard.
4) Transmit an image with Martin 1.
5) You should have an image through the external feedback.
6) After completing the image receive, go Sync page and adjust
the slant. - You could use the High-accuracy slant adjustment. - Do not push the
7) Push the TX(TX offset) button in the sync page.
8) Make sure that you have no slant in the TX. If you still
have slant, repeat from (6).
It is a good idea to use the High-accuracy slant adjustment at
Step 6. If you are not satisfied with the result, start it again. Never push the
Mem button at this step. You can use the LoopBack function of a mixer program
instead of using the external feedback line. Although this procedure can be
applied only for the soundcard that supports the full-duplex mode, the soundcard
that does not support the full-duplex mode should not have different frequencies
for TX and RX, and therefore you do not need this calibration. If you have a
report that your TX image is greatly slanted, try changing the soundcard modes,
monaural or stereo (Source in the Misc window of Setup MMSSTV). Some soundcards
seem to use different sampling frequencies for the full-duplex and no-full-
duplex operations. In such a case, the offset calibration using the external
loop back does not help. You should always have the loop back External or
consult the QSO report.