Date   

Re: Another ISS SSTV Project?

Clint Bradford
 

On Mon, Dec 16, 2019 at 05:01 PM, Jer W wrote:
Tonight I can only use the 19" whip.
If about 15 degrees or more elevation, you WILL hear '91 - open up your Squelch!



Re: Another ISS SSTV Project?

Jer W
 
Edited

 
Tonight I can only use the 19" whip. My home brew 2M, 8' boom, 7-element is in the garage and will not be able to set it up tonight.
I have a few adjustments to make on it and its already dark and getting colder tonight. I'm going to pull it down from the storage tomorrow
and set it up permanently. I was impressed with the results of using it when the ISS came over and contacted one of the local high schools.
  
 
Jerry...W8RQM
 
 

On Monday, December 16, 2019, 7:54:11 PM EST, Clint Bradford via Groups.Io <clintbradford@...> wrote:
 
 
Which antenna(s) are you going to use?


Re: Another ISS SSTV Project?

Clint Bradford
 

Which antenna(s) are you going to use?


Re: Another ISS SSTV Project?

Jer W
 
Edited

 
Thanks Clint,
 
I am going to try it tonight for AO91 when it is in my area at 23:23 to 23:35 EST local time.
Thanks again for all your help and quick response.  That is why this hobby is the greatest with
hams helping other hams. I appreciate it.
 
Jerry...W8RQM
 

On Monday, December 16, 2019, 7:48:33 PM EST, Clint Bradford via Groups.Io <clintbradford@...> wrote:
 
 
Summarizing ... 

-Use VFO B for TX
-VFO A for RX (it has better sensitivity)
-balanced audio all the way to VFO A
-open squelch for VFO A 
-5W transmit
-DUPlex On


Re: Another ISS SSTV Project?

Clint Bradford
 
Edited

Summarizing for the Kenwood TH-D72a ... 

-Use VFO B for TX
-VFO A for RX (it has better sensitivity)
-balanced audio all the way to VFO A
-open squelch for VFO A 
-5W transmit
-DUPlex On

The frequencies at work-sat.com are there for you ... You can simply be in VFO mode for both A and B.


Re: Another ISS SSTV Project?

Jer W
 

Hi Brad,
Have not talked with you in a while. I need to contact someone who may have the Kenwood TH-D72A to walk me through the process of setting up the HT for the SATS.
Having some difficulty and need someone that has the same model so we can discuss via e-mail or phone call.

Thanks,

Jerry...W8RQM



On Monday, December 16, 2019, 6:25:45 PM EST, Brad Smith via Groups.Io <corlissbs@...> wrote:


All that is needed is an HT capable of receiving 2 meters and a rubber duck antenna. Then you need an interface to decode the signal. Some people do this on a computer and others do this on their cell phone, with an app. I use SSTV app on my iPhone. I’m sure Android has an equal app.

Of course, if you have a better 2 meter antenna, your image will be better. Try it. It is fun.

73 Brad KC9UQR

Sent from Brad’s iPad


Re: Another ISS SSTV Project?

Brad Smith
 

All that is needed is an HT capable of receiving 2 meters and a rubber duck antenna. Then you need an interface to decode the signal. Some people do this on a computer and others do this on their cell phone, with an app. I use SSTV app on my iPhone. I’m sure Android has an equal app.

Of course, if you have a better 2 meter antenna, your image will be better. Try it. It is fun.

73 Brad KC9UQR

Sent from Brad’s iPad


Re: Another ISS SSTV Project?

Clint Bradford
 


Re: Another ISS SSTV Project?

Jer W
 

Hi Clint,
I down loaded the Robut36, but then it asked me to allow Robut36 to
access photos, media, and files on my devise. Do I really want to do that?
Why would it ask for things of privacy?

Jerry


On Monday, December 16, 2019, 4:54:01 PM EST, Clint Bradford via Groups.Io <clintbradford@...> wrote:



Re: Another ISS SSTV Project?

Clint Bradford
 


Re: Another ISS SSTV Project?

Jer W
 

Clint,
Is there an APP for the Android phone to view the SSTV? Is the HT suppose to be connected to the smart phone and if so, how?

Jerry


On Monday, December 16, 2019, 2:51:43 PM EST, Clint Bradford via Groups.Io <clintbradford@...> wrote:


An HT and a smartphone gets the job done!

http://www.work-sat.com/SSTV.html


Re: Another ISS SSTV Project?

Clint Bradford
 

That is for SSTV reception. Very few opportunities that past couple of years for 2m FM voice contacts. Watch ARISS and ARRL for possible projects.


Re: Another ISS SSTV Project?

Clint Bradford
 

An HT and a smartphone gets the job done!

http://www.work-sat.com/SSTV.html


Re: Another ISS SSTV Project?

Randal Rutkowski
 

What is the min equip I need to receive SSTV from ISS?  I always listen on a pass but have never had a voice contact since I don’t know their schedule.
Thanks
Randy
KM6RBG


On Dec 16, 2019, at 11:10 AM, Clint Bradford via Groups.Io <clintbradford@...> wrote:

Possible ARISS SSTV operation before year's end

ARISS reports the possibility of a worldwide commemorative SSTV operation from the International Space Station on Friday, Dec. 27 or Saturday, Dec. 28 and following days. 

The SSTV downlink frequency is 145.800 MHz. ARISS will provide more information as it becomes available. Watch the amsat-bb and follow @ARISS_status on Twitter for updates.

An SSTV system is an integral part of one of the ARISS ham radio stations, NA1SS/ RS0ISS in the Service Module. It transmits and receives JPEG still images. This system utilizes the Kenwood D700 and D710 radios and the ARISS antennas mounted on the Service Module. 
The SSTV equipment also includes SpaceCam and MMSSTV software, a radio/computer interface module and data cables. A Kenwood VC-H1 is also used to provide near real-time automatically transmitted images once every 3 minutes, when active.

A Kenwood D710 radio located in the Service Module was deployed by the Russian Space Agency, Energia to provide extended support of imaging experiments using various SSTV formats. It employs SpaceCam and MMSSTV software to transmit stored images.

The current Expedition 61 crew aboard the ISS includes Dr. Andrew “Drew” Morgan, KI5AAA, an emergency physician in the U.S. Army; veteran pilot Cosmonaut Alexander Skvortsov, RK6ATR; Luca Parmitano, KF5KDP, an Italian Air Force officer, pilot, and engineer; pilot Cosmonaut Oleg Skripochka; biologist Dr. Jessica Meir; and electrical engineer Christina Koch.

-ARISS, AMSAT, ARRL


Another ISS SSTV Project?

Clint Bradford
 

Possible ARISS SSTV operation before year's end

ARISS reports the possibility of a worldwide commemorative SSTV operation from the International Space Station on Friday, Dec. 27 or Saturday, Dec. 28 and following days. 

The SSTV downlink frequency is 145.800 MHz. ARISS will provide more information as it becomes available. Watch the amsat-bb and follow @ARISS_status on Twitter for updates.

An SSTV system is an integral part of one of the ARISS ham radio stations, NA1SS/ RS0ISS in the Service Module. It transmits and receives JPEG still images. This system utilizes the Kenwood D700 and D710 radios and the ARISS antennas mounted on the Service Module. 
The SSTV equipment also includes SpaceCam and MMSSTV software, a radio/computer interface module and data cables. A Kenwood VC-H1 is also used to provide near real-time automatically transmitted images once every 3 minutes, when active.

A Kenwood D710 radio located in the Service Module was deployed by the Russian Space Agency, Energia to provide extended support of imaging experiments using various SSTV formats. It employs SpaceCam and MMSSTV software to transmit stored images.

The current Expedition 61 crew aboard the ISS includes Dr. Andrew “Drew” Morgan, KI5AAA, an emergency physician in the U.S. Army; veteran pilot Cosmonaut Alexander Skvortsov, RK6ATR; Luca Parmitano, KF5KDP, an Italian Air Force officer, pilot, and engineer; pilot Cosmonaut Oleg Skripochka; biologist Dr. Jessica Meir; and electrical engineer Christina Koch.

-ARISS, AMSAT, ARRL


Re: ISS SSTV This Week?

Randy Davenport
 

It is a Russia-centric project ...

Clint


>> ... Clint, Where will iss be during these times?


ISS SSTV This Week?

Clint Bradford
 

Surprising, especially with a cargo mission heading its way to the ISS this week. BUT ...

Russian cosmonauts are expected to activate Slow Scan Television (SSTV) image transmissions on 145.800 MHz FM from the International Space Station on Wednesday to Friday, December 4, 5 and 6.

This is the schedule for the planned activation of the MAI-75 SSTV activity from the ISS.

• Dec 4: On - 12:00 GMT, Off - 16:50 GMT
• Dec 5: On - 11:25 GMT, Off - 17:15 GMT
• Dec 6: On - 10:20 GMT, Off - 16:40 GMT

Transmissions will be sent on 145.800 MHz FM in the SSTV mode PD-120. Once received, images can be posted and viewed by the public at http://www.spaceflightsoftware.com/ARISS_SSTV/index.php

ISS SSTV uses a Kenwood TM D710E transceiver which is part of the amateur radio station located in the Russian ISS Service Module.

Please note that SSTV events are dependent on other activities, schedules and crew responsibilities on the ISS and subject to change at any time. You can check for updates regarding planned operation at:
ISS Ham https://twitter.com/RF2Space
ARISS Status https://twitter.com/ARISS_status
ARISS SSTV Blog https://ariss-sstv.blogspot.com/
AMSAT Bulletin Board http://www.amsat.org/mailman/listinfo/amsat-bb

Read the MagPi article Pictures from space via ham radio
https://www.raspberrypi.org/magpi/pictures-from-space-via-ham-radio/

ISS SSTV info and links https://amsat-uk.org/beginners/iss-sstv/


From Email ...

Clint Bradford
 

I have received several email messages and telephone calls during the Thanksgiving "break" - 
many hams trying out the satellites for their first times! Really exciting, indeed!

Many "first-timer" questions are addressed in the tutorial offered on the home page and
throughout our support Web site ...

http://www.work-sat.com

Questions like ...

>> ... How do I know when a satellite will be overhead?

Several programs and sites cited on the TRACKING page on the Web site!

>> ... The satellite isn't breaking squelch ...

From the tutorial: The one “absolute” for success is to open up your SQuelch. We
are talking about “weak signals” from hundreds of miles away - so don’t expect
the satellites to be strong enough to break squelch like your local repeater does.
Sure, it’s a little noisy - but that’s part of the process: That noise is an aid in
locating the satellites! When the frequency starts exhibiting quieting, that’s a sign
that you are capturing the satellites’ signals.

>> ... Can I do this with the stock antenna that came with my handheld radio?

Again, from the tutorial: Improve your HT’s stock antenna (most are rated at
NEGATIVE 6db - or worse!). The Smiley 270A is a good performer, and is
available in Male SMA, Female SMA, and Male BNC models. But for best success,
you need more GAIN, so using an Arrow Satellite Antenna or Elk Log Periodic is
much better. If you prefer to home-brew your antennas, go to the work-sat.com Web
site’s ANTENNAS page for construction article links: You can get in to the world of
high gain operations for as little as $15!

>> ... Is Doppler only for receiving?

The Doppler phenomenon isn't "dependent" on whether a frequency is 
transmitted or received. It is "frequency-dependent." It is on the 440mHz side 
of life where we should compensate for Doppler. It is the 440 side where there 
could be as much as +/- 10kHz deviation in an FM satellite's frequency. So whether
that is SO-50's downlink - or AO-91 or '92's uplinks - it is the 440 frequency for which
we need to compensate. The frequency chart at work-sat.com takes this in to consideration
for you. 

>> ... I saw someone using a longer whip ...

Yes - I know of many who are successfully working AO-91 and AO-92 with stock or improved 
antennas on their HTs. A little more finesse is required - but it is being accomplished!

From the tutorial: If using a whip antenna, don’t hold it upright. Held in a vertical position,
your transmitted signal is hitting land-based receivers. Most of our satellites are not land-
based (grin). You need to tilt your HT’s antenna about the same amount as the satellites'
ELEVATION. Get it perpendicular to the orbit’s path! You will quickly get the hang of it -
and hear the difference. Again, you will have much better results with a modest beam or
Yagi antenna ...

>> ... [full-duplex operations] ...

From every of the 100+ presentation I have made, and from the tutorial: Ideally, we
should be working the FM voice satellites in full-duplex mode, where we can
simultaneously listen to the downlink as we are transmitting. Although this method is
preferred, it is not mandatory: Carefully monitor the downlink, and wait for a break
in the conversations to key your mic and announce yourself ...

>> ... What is my grid square?

There are Smartphone apps that will tell you your grid square. If you are home, a lookup
of your own callsign on QRZ.com has it for you. And on work-sat.com on the SHACK AIDS 
page is a link to a grid square locator!

Happy holiday season to all!

Clint K6LCS


WIMO xpol antennas for satellite use

Rusty O'Shaughnessy
 

I recently purchased the 2 meter and 70 cm X-Quad antennas from WIMO.
They can run horizontal or vertical, or circular with a phasing cable.
With switching, I can select any one of the three polarities from my shack.
Circular will be used for the satellites.

I am having some issues with very poor SWR on the 70 cm version.
I haven't started testing the 2 meter version.
The specs don't list the resonant frequency nor the bandwidth.
I asked WIMO about this and they didn't have any information on those specifications.

I'm hoping to be able to use the UHF from 430 MHz to 440 MHz.

Does anyone have any experience tuning these antennas?
With what results?

Thanks
Rusty O, K7RMO


ISS SSTV December 14-15?

Clint Bradford
 

Several workable passes over Southern CA - IF there’s an SSTV event December 14-15 ... Watch for details!