Shortwave Radiogram, del 4 a 7 Julio 2019

Shortwave Radiogram

We had a good week last weekend, with reception that was at least adequate for most listeners, and many great reception reports. Videos of last weekend’s Shortwave Radiogram (program 106) are provided by Scott in Ontario (Friday 1300 UTC), Ralf in Germany (Sunday 2330 UTC), and Jeff in Oklahoma  (also Sunday 2330 UTC). The audio archive is maintained by Mark in the UK. Analysis is prepared by Roger in Germany.

This weekend’s Shortwave Radiogram will include a test to detect if your MFSK images have a slant,
with steps to correct the slant if it occurs. Slant can occur even if
the sound card in your computer is perfectly calibrated. The slant is
actually caused by “disagreements” among the sample rates of various
devices in the process, including my sound card, your sound card, the
sound card of the computer at the transmitter site, the sound card
associated with any SDR you might use to receive this broadcast, and
other digital devices such as portable recorders.

We will transmit a vertical orange rectangle twice. During the first
transmission, make no adjustments. Just observe how much slant, if any,
you have. Then we will transmit the same image again. While the orange
rectangle is “painting,” if you notice a green “sliver” beginning to
form at the left of the image, try this in Fldigi: Configure > Sound
Card > Settings > Corrections > Change Rx ppm to 100. Further
adjust the Rx ppm until you achieve a vertical border between the orange
and the green.

If you notice a purple sliver forming at the right of the image, try an
Rx ppm correction of -100 (minus 100) and adjust as necessary until a
vertical border between the orange and purple is seen.

Of course, this is easier to do if you record Shortwave Radiogram. You
can play back the audio and make as many adjustments as needed.
The first (to the left) orange rectangle below is almost completely free
of slant. The second image shows a sliver of slant appearing from the
right: start with a correction of -100 (minus 100) and adjust from
there. In the third image, the slant appear from the left: start with a
ppm correction of 100 and adjust. The fourth image shows what happens
when a correction of 100 ppm is applied about half way through the
transmission of the image: the border between the orange and the green
parts of the image becomes vertical, which is what we are trying to
achieve …

 

This weekend’s show is in the usual MFSK32 and MFSK64.

Here is the lineup for Shortwave Radiogram, program 107, 4-7 July 2019, in MFSK modes as noted:

1:41  MFSK32: Program preview
2:49  NASA tests Orion’s launch abort system*
6:59  MFSK64: Image slant test and adjustment*
12:41  Climate effects of existing energy infrastructure*
17:09  This week’s images*
28:26  MFSK32: Closing announcements

* with image(s)

Please send reception reports to radiogram@verizon.net

And visit http://swradiogram.net

Twitter: @SWRadiogram or https://twitter.com/swradiogram (visit during the weekend to see listeners’ results)

Facebook group: https://www.facebook.com/groups/567099476753304

 

+----------------------------------------------------------------+
|            Shortwave Radiogram Transmission Schedule           |
+----------------------------------------------------------------+
| UTC Day  | UTC Time      | Frequency     | Transmitter site    |
+----------+---------------+---------------+---------------------+
| Thursday | 2330-2400 UTC | 9265 kHz      | WINB Pennsylvania   |
+----------+---------------+---------------+---------------------+
| Friday   | 1300-1330 UTC | 15770 kHz     | WRMI Florida        |
+----------+---------------+---------------+---------------------+
| Friday   | 1500-1530 UTC | 15120 kHz DRM*| WINB Pennsylvania   |
+----------+---------------+---------------+---------------------+
| Saturday | 0230-0300 UTC | 9265 kHz      | WINB Pennsylvania   |
+----------+---------------+---------------+---------------------+
| Sunday   | 0800-0830 UTC | 5850 7730 kHz | WRMI Florida        |
+----------+---------------+---------------+---------------------+
| Sunday   | 2330-2400 UTC | 7780 kHz      | WRMI Florida        |
+----------+---------------+---------------+---------------------+

The Mighty KBC transmits to North America Sundays at 0000-0200 UTC (Saturday 8-10 pm EDT) on 9925 kHz, via Germany. A minute of MFSK is at about 0130 UTC.  Reports to Eric: themightykbc@gmail.com . See also http://www.kbcradio.eu/ and https://www.facebook.com/TheMightyKbc/.

“This is a Music Show” is the newest addition to
digital modes via analog shortwave. Most of the show is a music show,
but the host transmits some MFSK text and image near the end of the
broadcast. It’s transmitted on WRMI, 9395 kHz, Thursday 0130-0230 UTC
(Wednesday evening in the Americas). Also look for a waterfall ID at the
beginning of the show. thisisamusicshow@gmail.com .
www.instagram.com/thisisamusicshow/ www.twitter.com/ThisIsAMusicSho/

New York and Pennsylvania NBEMS nets. Most weekends, as
KD9XB, I check in to the New York NBEMS (Narrow Band Emergency
Messaging Software) net Saturday at 1200 UTC on 3584 kHz USB, and the
Pennsylvania NBEMS net Sunday at 1200 UTC on 3583 kHz USB (with
out-of-state check-ins now starting at 1130 UTC). Check-ins are usually
in Thor 22, and messages are in MFSK32 (PA NBEMS is experimenting with
Thor 50×1 for messages). Messages generally use the Flmsg
add-on to Fldigi. If you are a radio amateur in eastern North America,
feel free to check in. Outside the region, use an SDR in the eastern USA
to tune in and decode. You do not need Flmsg to check in, and most of
the messages can be read without Flmsg. If you can decode the net, send
me an email to radiogram@verizon.net , or tweet to @SWRadiogram , and I
will let them know you are tuned in.

 

 

Al – @grovekid2 – in the Florida skip zone decoded the pleasantly
fuzzy red sails of the Russian ship during the 2330-2400 UTC broadcast,
30 June 2019, 7780 kHz from WRMI, also in Florida. See more results from
other listeners at Twitter @SWRadiogram or https://twitter.com/swradiogram.

 

Fuente: Shortwave Radiogram, 4-7 July 2019: During which we will try to unslant the slant

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