Date   

Dealing with doppler for newb...

Randon Loeb
 

So far have 2 contacts under my belt on AO-91. Just an HT and a tape measure yagi. Getting the hang of it so now there's some mental bandwidth during the pass to deal with the doppler changes...I've just left it on center freq for now.

All I know right now is as per some of the guides, I programmed 7 channels per satellite into my radio. #4 is the center, then the uhf goes up or down by 5khz for three clicks...you get the idea hopefully. At first I figured KISS and just used that center channel and hope for the best, not worry about turning the knob during the pass.

Now I think I can manage turning the knob during the pass, but how do I know when/if to adjust for doppler? I assume there's theory/formula, and then some rules of thumb?  Set a timer? By sound?

Thanks
Randy KN4YRM el96vc


Re: Newb was I heard?

Randon Loeb
 

I may have to take you up on that if I don't see any luck with SO-50.
The day after I posted I was able to get 2 on ao-91 though, one in Panama. The other was a guy in FL which is funny because we have statewide repeater network anyways, but still fun.
It does seem to me that the eastward over ocean passes are less "crowded", everything west of me seems crowded and I guess that makes sense. 
I figure if after 5 more SO-50 passes I don't make a contact I will investigate further.

73 Randy KN4YRM

On Sat, Oct 17, 2020 at 11:12 AM Charlie <charles@...> wrote:
Randy:

I missed that pass of SO-50, but would be happy to listen for you in the future and/or schedule a call on one of the FM satellites. I'm located in CT, and if you're in Florida it might be a stretch, but a decent pass over the ocean could allow us to make a contact. I've worked Cuba & Puerto Rico in the past. I currently have a compromised antenna system (Automatic rotator failure), but I'm willing to have a go at it. My contact info on QRZ is valid if you want to email direct.

73
Charlie, K1ECU


Re: Newb was I heard?

Randon Loeb
 

The next day I was able to make 2 contacts on ao91 so I think I generally got the idea. SO-50 no luck yet but seems "crowded" when I try so maybe it's just a matter of persistence and going for the less crowded eastern passes (I'm in FL).

Thanks for the tip on the voice recorder!

73 Randy KN4YRM


Re: Newb was I heard?

Charlie
 

Randy:

I missed that pass of SO-50, but would be happy to listen for you in the future and/or schedule a call on one of the FM satellites. I'm located in CT, and if you're in Florida it might be a stretch, but a decent pass over the ocean could allow us to make a contact. I've worked Cuba & Puerto Rico in the past. I currently have a compromised antenna system (Automatic rotator failure), but I'm willing to have a go at it. My contact info on QRZ is valid if you want to email direct.

73
Charlie, K1ECU


Re: Newb was I heard?

Fred Hillhouse
 

I use Heavens Above Pro and use it to guide my antenna pointing. Very useful.

 

Did you have a tone set for SO-50? It requires one.

 

May use a voice recorder so they can go back and review the pass. Keeping a log of the contact, controlling the frequencies, maintaining direction of the antenna keeps a person busy. Shed the logging to a recorder may help. Most smartphones can record audio.

 

Fred N7FMH

 

 

 

From: Work-Sat@groups.io [mailto:Work-Sat@groups.io] On Behalf Of Randon Loeb
Sent: Thursday, October 15, 2020 11:12 AM
To: Work-Sat@groups.io
Subject: [Work-Sat] Newb was I heard?

 

Hi,

Sat newb here, hoping to get my first contact. Just now I was able to hear SO-50, in a break I threw my call out. But I don't have ht ability to tx/rx simultaneously, so I lost my "lock" on the satellite (using a hand-held homebrew tape-measure yagi) while I transmitted, so not sure if anyone came back to me as it took me a second or two to move my arm around around and find the sat again. Would be nice to know if anyone heard me? Is there a site that logs calls heard, etc. or is it pretty much just reaching out to whatever calls are heard on the sat that day via qrz etc?
Thanks,
Randy KN4YRM




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Newb was I heard?

Randon Loeb
 

Hi,

Sat newb here, hoping to get my first contact. Just now I was able to hear SO-50, in a break I threw my call out. But I don't have ht ability to tx/rx simultaneously, so I lost my "lock" on the satellite (using a hand-held homebrew tape-measure yagi) while I transmitted, so not sure if anyone came back to me as it took me a second or two to move my arm around around and find the sat again. Would be nice to know if anyone heard me? Is there a site that logs calls heard, etc. or is it pretty much just reaching out to whatever calls are heard on the sat that day via qrz etc?
Thanks,
Randy KN4YRM


ARISS Success!

Clint Bradford
 

Congratulations to Mrs. C’s kids at Ramona Lutheran School this morning! AND the support crew, too!


FOX 1E Coming Soon!

Clint Bradford
 

Speaking of AMSAT-NA VP of Engineering Jerry ... related via his Twitter account:

"RadFxSat-2/Fox-1E is out of our hands and in the hands of
@Virgin_Orbit to fly as part of Launcher One's first payload. Great
fun sharing in their new experience and first integration. And tours
of their facilities to boot!

The satellite will carry the RadFxSat 2 radiation effects experiment similar
to RadFxSat (Fox-1B) but will study new FinFET technology.

Fox-1E will also serve as a communications relay for amateurs worldwide
via a new Mode J linear transponder. The transponder is planned to be
30 kHz wide and will also include a 1200 bps BPSK telemetry beacon. The
purpose of the project is to test a design for a linear transponder that could
be made available to CubeSat builders as a secondary, or even primary,
Amateur Radio payload.. The communications and experiment missions
will run concurrently.


Yaesu FT-7900 and the Easy Sats

Clint Bradford
 

A friend asks if he can use his FT-7900 and an HT to do anything with the "easy" satellites ...

ABSOLUTELY!

First, turn the rig's TX power DOWN to 5W ... (g)

And around Page 34 of the '7900's manual, there's a page sub-titled, "Odd Splits." 



These instructions DO work - but using RTSystems' programming software SURE makes 
this task MUCH easier! For Mac or Windows: https://www.rtsystemsinc.com/FT-7900_c_105.html

Program your FT-7900 in Split Freq mode will get you on the FM voice "easy" satellites. If your
DOWNlink is on 440/70cm (S)-50), accommodate for the Doppler phenomenon bu tuning slightly
ABOVE the transmitted frequency to ACQUIRE. If working AO-91 and its 440/70cm UPloink, you will
program your radio to transmit a little BELOW (frequency chart on the home page of work-sat.com ...

It is not "true, full-duplex" though: When you key the '7900's mic on the UPlink, you will not hear
your signal on the DOWNlink. BUT ...

This is where you can use your HT! 

When choosing which radio to use as the receiver in a two-rig setup, I usually like to use 
the radio with the better receiver as my DOWNlink radio. But with satellite AO-91's stong 
2m DOWnlink, you will be able to hear it with your HT and a modest antenna improvement (some 
are actually working AO-91 with STOCK HT ANTENNAS!)

SO ... If you were to purchase an antenna improvement (your Baofeng needs an SMA-FEMALE
antenna), these are great ...

COMET SMA-24 - always 17" long - https://www.hamradio.com/detail.cfm?pid=H0-011735

SMILEY 270 - FEMALE SMA - https://www.hamradio.com/detail.cfm?pid=H0-012996

The Smiley actually out-performs the popular Diamond SHR-320a on 2M - and is HALF the price of
a '320! The Smiley is an antenna that you can keep on the radio all the time: When collapsed, 
it is about the same length as a stock antenna. But when you need improved gain, THAT'S when 
you extend it! But if you are thinking of swapping out antennas on your HT a lot, you may want to invest 
in a suitable BNC-to-FMA adapter: Instead of wearing out your HT's delicate antenna connector (resulting 
in a potential $65 repair job), wear out a $12 adapter instead. The choice is yours ... (g)

So you have your receiver all set up - HT and improved antenna.

For transmitting with the '7900, you want some "directionality" to your signal. Yes, you can increase 
power and use a vertical or mobile antenna. But that's just "sloppy" ops (g). I mean, when you can 
work the ISS when it is 450 miles downrange with just 2W, well, you get the idea). Build yourself a 
tape measure antenna ... or any of the other easy, FUN projects on the ANTENNAS page at
http://www.work-sat.com - I just KNOW you have an un-used steel tape measure in the back of that 
junk drawer!

Operating tips, frequency chart, and a lot more for you at ...

http://www.work-sat.com

And ask any questions RIGHT HERE, too!

Clint K6LCS
909-999-SATS (7287)





 


Re: ISS digipeater

Traful
 

 

Hi Arup, I’m trying the same setup. No good results yet. I think we need some software similar to UISS (windows) for Android. More flexible “packet commands” than “automatic APRS commands”.

Post something if you have success !

 

Pablo, LW4DMH
lw4dmh@...

 





De: Work-Sat@groups.io <Work-Sat@groups.io> En nombre de Arup
Enviado el: lunes, 12 de octubre de 2020 18:10
Para: Work-Sat@groups.io
Asunto: [Work-Sat] ISS digipeater

 

I'm trying to use APRSdroid to digipeat off the ISS with a Baofeng HT, baofeng vox audio cable, droid, and Elk directional antenna. Has anyone had success? Specifically the digipath includes callsign>apdr16> coordinates. I can't find a way to replace "apdr16" with "cq" to reach the iss. Any tips or tricks that anyone can offer?

Arup


ISS digipeater

Arup
 

I'm trying to use APRSdroid to digipeat off the ISS with a Baofeng HT, baofeng vox audio cable, droid, and Elk directional antenna. Has anyone had success? Specifically the digipath includes callsign>apdr16> coordinates. I can't find a way to replace "apdr16" with "cq" to reach the iss. Any tips or tricks that anyone can offer?

Arup


Jerry Buxton on Fox Sats

Clint Bradford
 

   

Jerry just gave a detailed analysis of lessons learned from the AMSAT Fox satellite deployments. Great material - nothing held back. 


Will be available for viewing later! 

 

 


Re: ISS SSTV Projects

Fred Hillhouse
 

Hi Loren,

 

Let’s see if I understand your setup.

1.       It looks like you are running dual-screen with Robot36 on top and SDRTouch on the bottom.

2.       You made a cable to connect speaker out to mic-in or you just let the audio feedback into the mic.

 

This is the first I’ve heard of SDRTouch. I have downloaded the DEMO. I have not purchased the key yet so I am curious if direct frequency entry is possible.

 

Best regards,

Fred N7FMH

 

 

From: Work-Sat@groups.io [mailto:Work-Sat@groups.io] On Behalf Of Loren Lang
Sent: Tuesday, October 06, 2020 4:09 AM
To: Work-Sat@groups.io
Subject: Re: [Work-Sat] ISS SSTV Projects

 

I'll say, my new favorite combination to just use SDRTouch on my Android phone with Robot36 decoding the audio live. I have SDRTouch saving the complete baseband signal so I can go back, correct for Doppler shift, improve filtering, fix skew, but really, with just the straight live decode and no Doppler correction, I'm quite pleased with the results. I've attached a screenshot of my Android phone setup and the image I decoded live. I used the speaker on my phone to feedback into the mic so Robot36 would be decoding during capture. I used the Arrow II Leo Satellite Yagi for my antenna with the RTL blog SDR attached to my phone with an on-the-go USB cable. Very easy and portable.

73s,
Loren
K7IW




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Re: ARISS Project - New ISS Downlink Frequency

 

So, is this with a different radio than they use for SSTV?

Will all school contacts use this new downlink including the Ramona,
CA school contact next week?

Does this have anything to do with why the SSTV signal went silent again today?

-Loren
K7IW

On Tue, Oct 6, 2020 at 12:01 PM Clint Bradford via groups.io
<clintbradford@...> wrote:

From across the pond ...

Listen to an International Space Station school contact on Wednesday,
October 7, at 3:18pm BST (14:18 GMT) on a new ISS downlink frequency
of 437.525 MHz FM.

It will be a Telebridge contact conducted by Jan Poppeliers ON7UX using
the call sign ON4ISS and astronaut Chris Cassidy KF5KDR for students at
McConnell Middle School in the USA.

Downlink should be receivable across British Isles and Europe, details at

http://www.southgatearc.org/.../aeiss-event-update.htm

Live stream https://www.youtube.com/watch?v=pHOM15BLRSo


There's still time for you to Register for the Online AMSAT-UK International
Space Colloquium. This Free event takes place on Sunday, October 11 and
is Open to all. Those who are registered will be entered for a number of free
raffles which will take place during the event.

Schedule and info at

https://amsat-uk.org/2020/09/19/register-now-for-online-amsat-uk-space-colloquium-open-to-all/


Trevor M5AKA
----
AMSAT-UK http://amsat-uk.org/
Twitter https://twitter.com/AmsatUK
Facebook https://facebook.com/AmsatUK
YouTube https://youtube.com/AmsatUK
----


ARISS Project - New ISS Downlink Frequency

Clint Bradford
 

From across the pond ...

Listen to an International Space Station school contact on Wednesday,
October 7, at 3:18pm BST (14:18 GMT) on a new ISS downlink frequency
of 437.525 MHz FM. 
 
It will be a Telebridge contact conducted by Jan Poppeliers ON7UX using
the call sign ON4ISS and astronaut Chris Cassidy KF5KDR for students at
McConnell Middle School in the USA.
 
Downlink should be receivable across British Isles and Europe, details at 
 
 
 
There's still time for you to Register for the Online AMSAT-UK International
Space Colloquium. This Free event takes place on Sunday, October 11 and
is Open to all. Those who are registered will be entered for a number of free
raffles which will take place during the event.

Schedule and info at 

https://amsat-uk.org/2020/09/19/register-now-for-online-amsat-uk-space-colloquium-open-to-all/
 
 


Re: Unusual ISS SSTV signal

Brad Smith
 

On the 18:08 pass of the ISS, no SSTV signal was heard. 

Sent from Brad's iPod

On Oct 6, 2020, at 10:51 AM, Clint Bradford via groups.io <clintbradford@...> wrote:

I would rather be positive, and NOT think it was "malicious" in nature. But it does 
seem to be "local" to you.

And as with any "jammers," just don't acknowledge them nor try to contact them 
on the air ...

Clint


Re: Unusual ISS SSTV signal

Max White
 

If it is anything like the idiotic, mental cul de sac, G3 callsign/old duffer, who started talking to his mates on the ISS repeater downlink 'that it has now gone over and here are the times for tomorrow' - when it was still descending into the East from Zenith - nothing surprises me. Complete Moron!

73 Max/M0VNG


From: Work-Sat@groups.io <Work-Sat@groups.io> on behalf of Clint Bradford via groups.io <clintbradford@...>
Sent: 06 October 2020 16:51
To: Work-Sat@groups.io <Work-Sat@groups.io>
Subject: Re: [Work-Sat] Unusual ISS SSTV signal
 
I would rather be positive, and NOT think it was "malicious" in nature. But it does 
seem to be "local" to you.

And as with any "jammers," just don't acknowledge them nor try to contact them 
on the air ...

Clint


Re: Unusual ISS SSTV signal

Clint Bradford
 

I would rather be positive, and NOT think it was "malicious" in nature. But it does 
seem to be "local" to you.

And as with any "jammers," just don't acknowledge them nor try to contact them 
on the air ...

Clint


Re: Unusual ISS SSTV signal

AF7ZA
 

Clint. Is it possible someone was attempting to TX interference from ground ?

On Oct 6, 2020, at 8:29 18AM, Clint Bradford via groups.io <clintbradford@...> wrote:

I have talked to others who worked your pass. I think your issue is local, and not directly related to the ISS' equipment.

Clint


Re: Unusual ISS SSTV signal

Clint Bradford
 

I have talked to others who worked your pass. I think your issue is local, and not directly related to the ISS' equipment.

Clint

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