Page 1 of 1

Satellite SO-50 using a UV5R.

PostPosted: Tue Jun 04, 2013 8:56 am
by m0lsx
David Mercado KK4MND has produced a video showing how easy it is to receive the amateur radio satellite SO-50.
This video demonstrates how to communicate via Amateur Ham Radio Satellite using an inexpensive $50 Baofeng UV5R Dual Band Radio and MFJ dual band (rubber duck) antenna from Amazon. Among the stations heard are Hector Martinez CO6CBF, Dave Beumer W0DHB and James Bayne KI4SIY.


SO50 frequencies
Uplink - 145.850 MHz with 67 HZ CTCSS
(initial 74.4 Hz CTCSS tone required if satellite has not already been activated)
Downlink - 436.800 MHz


http://www.youtube.com/watch?feature=pl ... 4K41Ztax8#!

Re: Satellite SO-50 using a UV5R.

PostPosted: Tue Jun 04, 2013 9:03 am
by m0lsx
OK, I now know why it was not working for me..Having read the instructions, I now have the Youtube link working.


Re: Satellite SO-50 using a UV5R.

PostPosted: Tue Jun 04, 2013 9:24 am
by SilverShadow
Great post Alan and interesting info. My partner has communicated with The ISS before, if I remember rightly it was on UHF uplink (70cm) and VHF downlink (2m).

The slight changing of frequency (in 5khz steps) is a new one to me, does the actual frequency on the sattelite change or is this some kind of doppler effect causing the frequency to slighly change? Edit... scrub that I watched the video again, I knew doppler effect had an effect on the time it takes to receive a message but I didn't know it made a signal go off frequency.

I'd like to hear this, I've found http://www.satview.org/?sat_id=27607U which is a good online tracking site for SO-50's current position, it's heading our way towards The UK as I type :walkietalkie:

Re: Satellite SO-50 using a UV5R.

PostPosted: Tue Jun 04, 2013 9:44 am
by m0lsx
It's Doppler effect & it effects the frequency by 20khz..If my memory is correct, it's by plus 10khz at the start of the pass & then by minus 10 KHz as it finishes the pass. And thats a constant changing efect as the angle of the signal through the ionosphere & the speed of the satellite relative to you changes.
I have worked the ISS a couple of times once from the car, but sadly the Death Star muppets are making it harder & harder to work the ISS as the selfish sods are using 145.800, the ISS voice downlink frequency with no respect for anyone else's use. Voice uplink is on 145.200, so it's normal repeater shift.

Re: Satellite SO-50 using a UV5R.

PostPosted: Tue Jun 04, 2013 9:56 am
by SilverShadow
Yep I understand your frustation there's nothing worse than D Star for interfering, I still don't see how it complies with ham proceedure as you are supposed to check and ask if a frequency is clear before using it which is something they can't do as they can't even hear analogue users yet we have to put it with the horrible noise.

Re: Satellite SO-50 using a UV5R.

PostPosted: Tue Jun 04, 2013 11:23 am
by m0lsx
Plenty of non death star digital users manage to operate without feeling the need to stop others from being able to enjoy their part of the hobby too..Death star users would be most upset & rightly so, if we all acted like them & jumped all over their Death Star repeater input frequencys.. There is no difference between what these individuals are doing & what anyone else does who knowingly causes others problems..This is exactly the same action that those who try to key over others using repeaters are doing, it's the same as those who deliberately tune up on an active frequency on HF do, no matter what justification these selfish individuals use, it is deliberate, selfish & unnecessary.