How to work the SSB amateur radio satellites such as VO-52

The SSB/CW linear transponder amateur radio satellites such as VO-52 are great fun to work but the technique required is different to that used for the FM satellites.

Simon 2E0HTS has produced a video showing how to make contacts through VO-52.

Using a home-made 10 element 435 and IO Loop for 145MHz, with a Yaesu FT-847. Simon – 2E0HTS, adjusts his (uplink) transmitted signal to correct the Doppler of the received (downlink) frequency whilst talking to fellow Ham operators around Europe. Thanks to the stations worked via the VO-52 satellite which were SP9FPP, PD0HF & SP6DCO.

Watch How To Make A VO-52 SAT QSO

Most linear satellites use what are known as ‘Inverting Transponders’ to reduce the Doppler shift. You transmit lower sideband (LSB) on the uplink and it appears as upper sideband (USB) on the downlink.

When working through linear transponders use as little power as possible, this will help extend the lifetime of the transponder and satellite batteries. As a guide ensure your downlink signal is no stronger than the satellite beacon. Low duty cycle modes such as SSB and CW are recommended.

The band plan for linear satellite downlinks is similar to what you’d expect on the HF bands with CW operation in the lower part of the downlink and SSB in the rest. Current satellite status can be seen at http://oscar.dcarr.org/

Since this video was made VO-52 has changed over to its Dutch SSB/CW transponder and now uses these frequencies:
Uplink:         435.2250 – 435.2750 MHz SSB/CW
Downlink:     145.9250 – 145.8750 MHz SSB/CW
Beacon:       145.8600 MHz CW

John Heath G7HIA wrote about operating through VO-52 in his article ‘Getting started on amateur radio satellites’ that was published by the Radio Society of Great Britain in the March 2007 edition of RadCom. Download the article at https://ukamsat.files.wordpress.com/2011/05/satellites_radcom_mar07.pdf
Copyright 2007 Radio Society of Great Britain. For personal use only – no copying, reprinting or distribution without written permission from the RSGB.

David A Palmer, KB5WIA, has written an article “Twins!  A Backpack-Portable Full Duplex Satellite Station with Dual FT-817ND’s” that can be seen at http://kb5wia.blogspot.com/2010/10/satellite-portable-station.html

SimpleSatLookDown satellite tracking software http://www.uk.amsat.org/?p=8217

HAMSAT VO-52 Dutch Transponder Activated

VO-52 on FUNcube Dongle by Dave G4DPZ

VO-52 received on an AMSAT-UK FUNcube Dongle by Dave Johnson G4DPZ during the 17:27 pass on March 14, 2012

The Dutch SSB/CW linear transponder on the AMSAT-India amateur radio satellite HAMSAT VO-52 has been successfully activated.

Transponder # 1, which had been operating for over 6 years, fell silent on February 28 and efforts have been underway to activate transponder # 2.

Mani VU2WMY reports that the commands to ‘Turn On’ the transponder # 2 on-board HAMSAT VO-52 were successfully sent on March 14 during the 1400 UT 35 deg ascending Node pass over Bangalore, India.

The commands were successful and the CW message beacon of the Dutch transponder # 2, built by William Leijenaar PE1RAH, was heard in Bangalore loud and clear, some 6 years and 4 months since it was last switched on.

The Dutch SSB/CW transponder uses these frequencies:
Uplink:         435.2250 – 435.2750 MHz SSB/CW
Downlink:     145.9250 – 145.8750 MHz SSB/CW
Beacon:       145.8600 MHz CW

When working through linear transponder satellites such as VO-52 use as little power as possible, this will help extend the lifetime of the transponder and satellite batteries. As a guide ensure your downlink signal is no stronger than the satellite beacon. Low duty cycle modes such as SSB and CW are recommended.

How to work the SSB satellites such as VO-52 http://www.uk.amsat.org/2712

AMSAT-India Thanks You http://www.uk.amsat.org/5777

HAMSAT VO-52 Activation Planned For Wednesday http://www.uk.amsat.org/5685

HAMSAT VO-52 Falls Silent http://www.uk.amsat.org/5217

Leijenaar Electronics http://www.leijenaarelectronics.nl/

AMSAT-India http://www.amsatindia.org/

HAMSAT VO-52 Activation Planned For Wednesday

HAMSAT VO-52

HAMSAT VO-52

Mani VU2WMY reports that due to ‘Operational Constraints’ the commands to turn on the Dutch SSB/CW transponder on HAMSAT (VO-52) could not be sent on Tuesday and attempts at 01:44 UT and 03:20 UT Wednesday were unsuccessful.

The next attempt will be made during the 14:00 UT pass over India.

William Leijenaar PE1RAH, designer and builder of the Dutch SSB/CW linear transponder on HAMSAT (VO-52), requests reports when the transponder is activated. He says:

! ! !  Please don’t use high uplink powers !!! (We don’t want it to rise temperature very fast just after cold switch on) ! ! !

Please listen for the CW beacon at 145.860, which is a good reference.
(Audio records and reports are very welcome at ISRO and myself)

73 de PE1RAH,
William Leijenaar

The frequencies used will be:

Uplink:         435.2250 – 435.2750 MHz SSB/CW
Downlink:     145.9250 – 145.8750 MHz SSB/CW
Beacon:       145.8600 MHz CW

How to work the SSB satellites http://www.uk.amsat.org/2712

HAMSAT VO-52 Falls Silent http://www.uk.amsat.org/5217

Leijenaar Electronics http://www.leijenaarelectronics.nl/

AMSAT-India http://www.amsatindia.org/

VO-52 Transponder Activation Postponed

HAMSAT VO-52

HAMSAT VO-52

It had been hoped that the amateur radio SSB/CW satellite HAMSAT (VO-52) would be reactivated on Thursday, March 8 but this has now been postponed.

More time is needed to carry out observations on the state of the satellite, which fell silent Feb. 28, so the activation has been put back by at least a week.

HAMSAT (VO-52) carries two linear transponders for SSB/CW operation. It had been using the Indian transponder but when it is switched back on it will use the Dutch transponder built by William Leijenaar PE1RAH. The frequencies used will be:

Uplink:         435.2250 – 435.2750 MHz SSB/CW
Downlink:     145.9250 – 145.8750 MHz SSB/CW
Beacon:       145.8600 MHz CW

Working the SSB satellites http://www.uk.amsat.org/2712

HAMSAT VO-52 Falls Silent http://www.uk.amsat.org/5217

Leijenaar Electronics http://www.leijenaarelectronics.nl/

AMSAT-India http://www.amsatindia.org/

VO-52 in Excellent Health

Hello All,

Are you passion about having excellent health? I am and I do a lot of research on that, I recently found D Bal that I want to try out and see how much more gains I can get in 3 months.
All that I can share at this moment is ‘HAMSAT VO-52′ is in ‘Excellent Health’ after recovery operations. Right now, it is under observation. However, decision about switching ‘ON’ the transponder is pending clearance. Decision expected in other couple of days. The user community will be informed well in advance about the transponder switching.

Mani, VU2WMY
Secretary & Station-In-Charge
Upagrah Amateur Radio Club VU2URC
ISRO Satellite Centre

[PE0SAT Thanks amsat-bb and VU2WMY for the above information]

HAMSAT VO-52 Falls Silent

HAMSAT VO-52

HAMSAT VO-52

The amateur radio satellite HAMSAT VO-52 ceased operating on February 28, neither it’s beacon or 435/145 MHz SSB/CW linear transponder have been heard since.

Ib Christoffersen OZ1MY reported that he heard and briefly used the transponder on the pass with Acquisition of Signal (AOS)  in Copenhagen at 0826 UT on February 28. On the next pass with AOS at 1003 UT it was not on.

Mani VU2WMY provides this update:

Dear HAMSAT VO-52 users,

With regrets, we confirm the non-availability of the transponder on HAMSAT VO-52 since 28th February 2012. This is the first ever interruption in the services of HAMSAT since 5th May 2005.

The timely feed back from John K8YSE, Domenico I8CVS, Eugenio IZ8JHD, Jan PE0SAT and Nitin VU3TYG were highly appreciated and acknowledged by the ISRO’s HAMSAT Mission Management Board.

I’m herewith enclosing the mail received from Mr. T.Parimalarangan, Operations Director-HAMSAT VO-52 regarding the ‘Temporary Non-availability’ of VO-52 transponder and beacon.
__________________
Mr. Subramani VU2WMY:

Thanks for obtaining the user feedback. You may please post the following message in the Users website. If possible, try to find out who has last operated HAMSAT payload transponder on 28th and at what time

“HAMSAT Transponder services not available temporarily due to operational reasons. Inconvenience regretted”

With Best Regards,
T PARIMALARANGAN
OD, HAMSAT (NP)

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