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  I am operating via amateur radio satellites OSCAR,
 (OSCAR means abbreviation from
 Orbiting Satellite Carrying Amateur Radio)
such as AO-7, AO-10, AO-13, AO-27, FO-20, FO-29,
SO-50, UO-14, AO-51, VO-52.

  Some of themes are not operable any more (AO-10, FO-20, UO-14 due the battery problems.
AO-13 was crashed in December 1996.)

  I was also active via AO-40, modes U/S2 and L1/S2, before he was die in January, 2004... 
Uplink U-band (435.550 - 435.800 MHz): FT-847 antenna 4 x 19 el. yagi with horizontal polarization, 
usual array, which I using for 432 MHz CW/SSB DX-ing.  Not the best for satellite communication,
because of high SWR on 435,5 MHz and linear polarization!

Uplink L1-band (1269 MHz): FT-736R + 55 elements F9FT, 10 watt output.
Downlink S2-band (2401.225 - 2401.475 MHz). Down converter, type MKU 24 TM OSCAR (from DB6NT),
which I installed on the dish  antenna (67 cm in diameter) with LHCP patch, designed by 7N1VNW and
optimized by K3TZ. Very easy! It Has been made in a few hours! This dish was installed on the H-frame
between of 4x19 el. yagis and worked good enough without any additional adjustment!
Look at the pictures.

 My QSOs on the first day (28.02.2003) on AO40 were: VK1VL, JA1CG, JA0BBW, ZS6JON, ZS6JT, EX8MLT 
and many others from
Another antenna has been tried for AO-40 downlink - 21 turns helix  together with my new down
converter (2401/145 MHz) from Parabolic AB (
But I was not lucky of this antenna - read this article.

Unfortunately, the AO-40 is dead in January 2004 and nobody knows, if it will return back to the life...
Just let's hope and keep our converters in a safety place!
Here is online AO-40 Activity Report Logger by HB9DRI.
Some comments are there....

The latest news regarding to the AO-40 is possible to get from AMSAT-DL

Amateur satellite AO-51(AMSAT ECHO)!

OSCAR E ("Echo") - is a microsat-class satellite under construction by
AMSAT-NA. Similar to original Microsats AO-16, DO-17, WO-18, LO-19 and
descendents IO-26, AO-27, MO-30, SO-41

AO-51 was launched on June 29, 2004 from the Baikonur Cosmodrome.

After about 1 month of tests it was open for HAMs operation...

Echo carries a FM repeater capable of 144MHz and/or 1.2GHz uplink with a 435MHz
and/or 2.4GHz downlink. Also, it has AX.25 digital PACSAT BBS and a PSK31 uplink
on 28MHz. The satellite is available for worldwide usage for voice and data
communications. PL tone 67Hz must be used on uplink frequency.

 Very good running and there are my firsts QSOs via AO-51.

 The main and most official information about AO-51 (such as operation schedule, modes and control
team news) is possible to get from AMSAT-NA site.

The micro satellite VO-52 (HAMSAT)

Was blasted off from the Satish Dhawan Space Centre in Sriharikota on
Thursday, 05.05.2005, at 10.22 hrs IST. HAMSAT was inserted to a Near
Circular Sun Synchronous Polar Orbit (628 kms) at 10.41 hrs IST.
Telemetry received from the HAMSAT says all systems are healthy.
Salience features
Dimensions: 630mm x 630mm x 550mm Cuboid
Mass: 42 Kgs
Antennas: UHF Turnstile, VHF Turnstile
Orbit: Near Circular Polar Low Earth Orbit
Structure: Aluminium Honey Comb Structure

HAMSAT frequencies, Mode B (UV):

                     Indian transponder:

 Uplink    : 435.225MHz to 435.275MHz LSB/CW
 Downlink: 145.875MHz to 145.925MHz USB/CW
 Beacom : 145.940MHz continue carier signal

                   Dutch transponder:

 Uplink    : 435.225MHz to 435.275MHz LSB/CW
 Downlink: 145.875MHz to 145.925MHz USB/CW
 Beacon  : 145.860MHz 12WPM with CW message  

 Here is extraction from my log book (VQLog) of the several first QSOs via HamSat.

Micro satellite DO-64 (Delfi - C3) 

On the 28th of April at 03:53 UTC the Delfi-C3 was succesfully launched with a PSLV launch vehicle. At 06:45 UTC the first signal was recieved from a radio amateur in California. At 11:55 UTC the satellite signal was acquired and decoded at the TU Delft groundstation, initial analysis showed the craft to be in excellent condition, all solar panels and antennas were deployed and the internal temperatures and voltages were within the ranges expected.

Delfi-C3 is the first nanosatellite student project from the Delft University of Technology in the Netherlands. The satellite is based on the CubeSat concept and a number of novel technologies will be tested on board the satellite:

Uplink: 435.570 - 435.530 MHz

Downlink: 145.880 - 145.920 MHz (inverting) 400 mW PEP

Beacon: 145.870 MHz CW

The most recent micro satellite "XW-1" (Also "Hope OSCAR 68" or HO-68)
Launch Date: December 15, 2009

Apogee: 1200km

Perigee: 1200km

Inclination: 105

Period: 109

Dimension: Φ680mm×432mm


Mode V/U (J) FM Voice Repeater (30 dbm (1 w)):

Uplink: 145.8250 MHz FM, PL 67.0 Hz.

Downlink: 435.6750 MHz FM


Mode V/U (J) Linear Transponder (Inverting) (30 dbm (1 w)):

Uplink:145.9250 - 145.9750 MHz SSB/CW

Downlink:435.7650 - 435.7150 MHz SSB/CW


Mode V/U (J) PacSat BBS (30 dbm (1 w)):

Uplink:145.8250 MHz AFSK 1200 BPS

Downlink: 435.6750 MHz AFSK 1200 BPS


Mode Beacon (23 dbm (200mw)):

Downlink:435.7900 MHz CW

My antennas for satellite operation

This antennas setup I did used for experiments with satellites (mainly AO-51, because nothing to do with
 another satellites!) in KO29IJ (Tallinn). Full elevation, computer controlling via KCT-board.
 Antennas for 23 cm, 70 cm and 2 m bands has mast preamplifiers.

From the left to the right:
- 19 elements yagi for 70 cm band (Värgarda AB);
- 35 elements yagi for 23 cm band;
- X-400 dual band 145/435 MHz vertical (Diamond);
- 21 turns helix with down converter (2401/145 MHz) for "S"-band (Parabolic AB, Sweden);
- 9 elements yagi for 2 m band (Värgarda AB). This setup not exist any more.


My current antenna setup for satellites on separate mast. Just 5 meter AGL. 2x9 el for 145 MHz and 2x19 el. for 435 MHz. The system is made from commercial antennas (VARGARDA AB, Sweden), using  experience of Ole, OZ2OE (  Azimuth and elevation automatically controlled via KCT- board.
This antenna I am using from time-to-time for portable operation with FM hand held YAESU FT-51R. Such a kind of antenna  was designed by Kent Britian, WA5VJB and full credit belongs to him of this design! Antenna has a very simple construction and mounted on the wooden boom and could be build up for 144, 432 and 1296 Mhz bands. Complete article with a sample of design is here:  Both antennas are connected through diplexer to the radio.
I have a lot of fun, using this antenna!


Amateur Radio on the board of International Space Station

I am very proud of my several QSOs with a crew members
of ZARYA. Here is a QSL card, which confirm my QSO with
Russian cosmonaut Valery Korzun. 
The cosmonauts has not many time to work in the air and
more of themes are not a "real HAMs".
So, sometimes during all pass we can only listen one QSO... 

27th of November, 2005 I was lucky to speak with NA1SS during the pass No.40137, 12th expedition's commander, William (Bill) McArthur (KC5ACR). And I was more surprised to get from PA0RKC (Cor) audio file.
He recorded part of our QSO, of course only what he can hear, i.e. NA1SS, who are calling me.  Here it is.

For that QSO I've also have a QSL-card


Worldwide packet uplink: 145.990 MHz FM
Region 1 voice uplink: 145.200 MHz FM
Region 2/3 voice uplink: 144.490 MHz FM
Worldwide downlink: 145.800 MHz FM
Very useful new capability onboard ARISS - the cross band repeater.
It was activated in August 2004. Some of my very first QSO are here.
Repeater Uplink: 437.800 MHz FM
Repeater Downlink: 145.800 MHz FM
Doppler Shift is 10 KHz

On February 2007 I become a member of ARRL DXCC Award Program!

My DXCC Satellite Award # 296 confirms 105 countries of 119 worked.

  DXCC summary           Squares list (text)         Main squares (World map)

                  Initial satellites QSO

                                   Temporary I'm stopped my satellite activity,
           because need to put more effort for station setup on 432 and 1296 MHz for
                  more  successful  EME operation. Probably, I will be back soon.

                In my log I keep 4045 QSOs from 119 DXCC countries  via satellites.



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This site was last updated 09/27/11