AT5KLH on satellites from Kachchhigadh Lighthouse

AT5KLH ILLW August 18-21Rajesh Vagadia VU2EXP will be active on the FM satellites from Kachchhigadh Light House during August 18-21.

This will be second Light House of Gujarat state which will be activated after Veraval Light House (AT3VLH) was activated by Rajesh Vagadia VU2EXP & Sakshi Vagadia VU3EXP (father & daughter) in 2022.

Our Motive for AT5KLH Lighthouse Activation is to;

  • Spread awareness of Khachhigadh Lighthouse amongst students & public
  • Highlight the World class Shivrajpur Beach which is only Blue Flag awarded beach from Gujarat State
  • Aware about Lighthouse functioning
  • Highlight its importance in Maritime traffic
  • Understand it’s Heritage value
  • Show our gratitude to the Lighthouse keepers & administration
  • To give exposure of Amateur Radio to young generation
  • Enjoy Ham Radio Activity at the coast of Light House!

Operation Dates: 18th to 21st August, 2023

Grid Locator: ML42LH

HF Operating Bands: 40m, 20m, 15m, 10m

VHF Band: 145.500 MHz simplex

Modes: FM, SSB, Digital & Satellite

Radio: Icom IC-718, Icom IC-705, Kenwood TM-281A, Pair of HTs

Antenna: Fan Dipole for 40m, 20m, 15m

EFHW Antenna 40m – 10m

Satellite antenna: Arrow-II, Dual Band Yagi, IOio Antenna

More details will be published soon at
Look for AT5KLH

Thank you 73

Rajesh P. Vagadia – VU2EXP
Rajkot – Gujarat – India

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AMSAT-UK Colloquium 2023

Kents Hill Park Conference Centre Milton Keynes MK7 6BZ

Kents Hill Park Conference Centre Milton Keynes MK7 6BZ

AMSAT-UK is pleased to announce that the 2023 Colloquium will take place alongside the RSGB Convention at Kents Hill Park Conference Centre, Milton Keynes on the weekend of 14/15th October 2023.

Full details of the Colloquium will be made available nearer the time on the AMSAT-UK website at
As in previous years, the AMSAT-UK Colloquium will run as a separate stream within the RSGB Convention and will include presentations on a variety of satellite and space related topics.

The Annual General Meeting of AMSAT-UK will take place during the colloquium. The calling notice for the AGM will be issued once the programme of events has been finalised.

An AMSAT Gala Dinner will be held on the evening of Saturday 14th October at the Marriott Delta Hotel on Trimbold Drive, Kents Hill, Milton Keynes. Attendance is restricted this year at the hotel and a limited number of tickets are on sale via the AMSAT-UK Online Shop.

The cost of the Gala Dinner is £39 per person and includes a three course meal with tea / coffee at its conclusion.
Alongside the Gala Dinner, AMSAT-UK has reserved a number of rooms at the Marriott Delta for the evening of Saturday 14th October 2023. These rooms include breakfast on Sunday 15th and are priced at £84 per room for single occupancy or £95 for double occupancy. Hotel accommodation and tickets for the Gala Dinner can be purchased on the AMSAT-UK Online Shop.

Bookings for the Hotel and Gala Dinner are now available on the AMSAT-UK Shop, but must close on 1st October 2023 unless sold out sooner, so please book early to avoid disappointment.

Entrance to the RSGB Convention is managed by the RSGB and you will be required to purchase Day Tickets for the Saturday and/or Sunday to attend the AMSAT-UK Colloquium. These can be booked via the RSGB website at Early bird discounts are being offered by the RSGB via their website.


Barry Sankey G7RWY and Dave Johnson G4DPZ
AMSAT-UK Joint Secretary



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EO-88 (Nayif-1) Re-enters

EO-88, with its 70cm to 2m linear transponder, having spent a trouble free 6 years and 5 months in space, finally re-entered the Earth’s atmosphere and burned up on Tuesday, 18th July. Having originally been launched into a 500km orbit, EO-88 has reduced in altitude rapidly over the past year due to the increased level of solar activity.

Remarkably, some of the last frames of telemetry were captured as the 1U CubeSat passed over the South Western United States.
The final 90 seconds show a rapid rise in temperature across all the satellites sub systems. The last frame of data was captured by David WB0IOZ in New Mexico at 18:18:54 UTC showing the antenna temperatures operating about 40 degrees above normal.

During the past 2 weeks, 86 stations have contributed EO-88 telemetry to the FUNcube Data Warehouse and this has given us the opportunity to study the behaviour of a functioning CubeSat as it makes its return from Space. Thank you all for your support.

Having provided the last frame of data, David WB0IOZ, wins the telemetry section of the AMSAT-UK re-entry competition and will receive a framed certificate of achievement.

The prediction for the date and time of re-entry was very close with Paul N8HM predicting the 17th July and Larry N1MIW calculating the 21st. However, the winning entry was made by Thomas HB9SKA who correctly predicted the 18th July. Thomas also wins a framed certificate.



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Two awards available from AMSAT-UK regarding EO88’s re-entry

As you may be aware, Solar Cycle 25 has already shown that we cannot yet predict what the sun will be doing with any great accuracy.

Sunspots, X-class solar flares and CMEs (coronal mass ejections) are increasing in frequency and intensity on a daily basis.

The peak of Solar Cycle 25 was not expected until late 2024 or early 2025 but it may be coming earlier and have a higher intensity than was predicted.

One result of this increased activity is that the upper atmosphere and ionosphere of the earth becomes warmer and expands upwards. This means that spacecraft in low earth orbit experience more drag or resistance as a result of the increase in the number atoms they are having to displace as they travel around the globe. As a consequence, the spacecraft loose more kinetic energy and start to descend lower in orbital height, which, of course, makes the problem worse and a fiery end to the spacecraft is hastened.

The actual effect is also dependant on the drag coefficient of the particular spacecraft…simply how much mass (the more the better) to how much surface area (the less the better). So in CubeSat terms, a 1U CubeSat, fairly full of stuff with a mass near the maximum of 1.3kg, will probably be better off than a half empty 3U CubeSat with deployable solar panels and other drag inducing protuberances.

All TLEs (Two Line Elements) include a parameter called drag, it is usually a very small number preceeded by four or more zeros! Although this parameter is calculated by the system, it is not usually precise or even stable, so cannot be used to accurately predict deorbit dates when looking forward many weeks/months. It can give us a guide though! Alarm bells should ring when we only see two leading zeros.

How does this effect our activities? Well for the FUNcube family, there are presently three active members!

FUNcube-1, AO73 was launched almost ten years ago in November 2013 into an elliptical polar orbit of approx 682×595 km. Presently those numbers are around 640×570 km so probably not too much to worry about. The drag number from the TLEs is, at the time of writing, 0.000074, a good number.

The same applies to JY1SAT, JO-97. This was launched in December 2018 into a 573×590 km polar orbit. Presently those numbers are around 557×573 km and the current drag is listed as 0.000076.

Unfortunately, however, the same cannot by said for Nayif-1, EO88. This spacecraft was launched in February 2017 into a 496×507 km polar orbit. Currently the orbit parameters show a height of around 320 km with the drag at 0.00319. It is now well below the ISS and much lower than at launch.

As mentioned, largely due to the random nature of the our star’s flux output on a day to day basis, it is not possible at this stage to accurately predict the likely deorbit date but it seems that it will certainly be before the end of this year. As the spacecraft continues to perform 100% nominally this is a great shame. Presently it is switching autonomously from high power telemetry when in daylight and with lower power telemetry and the transponder active when in darkness. The solar panels, battery and power system also continue to be reporting nominal numbers, essentially unchanged since the day of launch.

It will therefore be a really sad moment when re-entry occurs but in the meantime everyone is encouraged to use the spacecraft whilst it remains available.

To mark the event of EO88/Nayif’s demise, AMSAT-UK is offering two awards. These will be individual framed certificates.

Firstly, to the station who submits the last telemetry to the FUNcube Data Warehouse and also to who “guesses” or calculates the re-entry time and date most accurately. Submissions for this award must be made to before midnight (UTC) on July 4th 2023. So time is short to get your entries in. Good luck!

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Summer 2023 OSCAR News now available

E-members of AMSAT-UK can now download the Summer 2023 edition of OSCAR News, issue 241, here.

The paper edition edition will be sent to postal members and should arrive in the next 2-3 weeks.

In this issue:
• From the Secretary’s Keyboard
• Satellite News
• “St Davids Rove” 28th Feb – 1st March 2023 by Nick MW1DDD/P
• G3VZV Operating via QO-100 on South Georgia as VP0GAA and on Tristan da Cuhna as ZD9VZV in March 2023
• Part of a great clear-out!
• ARISS International Meeting April 2023
• ITU News
• Receiving HAMTV from the ISS
• QO100 and a Family Road Trip Jim Ryan EI3DP
• QO-100 Portable Station by Dave M0GIW
• FUNcube-1 was centre-stage in the British Science Week

AMSAT-UK FUNcube Mission Patch

AMSAT-UK FUNcube Mission Patch

Membership of AMSAT-UK is open to anyone who has an interest in amateur radio satellites or space activities, including the International Space Station (ISS).

E-members of AMSAT-UK are able to download the quarterly publication OSCAR News as a convenient PDF that can be read on laptops, tablets or smartphones anytime, anyplace, anywhere. Join as an E-member at Electronic (PDF) E-membership

PDF sample copy of “Oscar News” here.

Join AMSAT-UK using PayPal, Debit or Credit card at

E-members can download their copies of OSCAR News here.

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