| Date | Call | Square | Bands | Mode |
| 1981-06-27 | PD0LJX | CL49a | 145MHz | FM 6 Channels 145.250/275/325/350/375/400 My First amateur radio contacts |
| 1983-02-03 | PE1ITR | CL49a (JO21UL) | 144MHz and up | First contact with this callsign |
| 1983 | PE1ITR/OE | GG (JN66) | 144MHz | SSB |
| 1985-04-06 | PE1ITR | JO21UL | 144MHz | First QSO with my home made all mode 144MHz tranceiver |
| 1990-01- | PE1ITR | JO21UL | 50MHz | New band: Special Permit to use 50.000 - 50.450MHz |
| 2003-10-16 | PE1ITR | JO21QK | 432MHz | My first EME contact on the 70cm band |
| 2005-09-22 | PE1ITR | JO21QK | 437.100MHz | Detection of the Mars Reconnaissance Orbiter. DX: 14 Million Kilometers!! |
| 2006-10-20/22 | PE1ITR/J | JO21QK | HF-144MHz-432MHz | JOTA 2006 |
| 2007-08-05 | LA/PE1ITR SM/PE1ITR | JP31, JO76, JO79 | 144MHz | MS FSK441 |
| 2007-10-20/22 | PE6SBW/J | JO21QK | HF-144MHz | JOTA 2007 |
| 2007-11-03/04 | PC5M | J021OJ | 144MHz | Marconi Memorial Contest 2007 |
| 2008-06-15 | LX/PE1ITR/P | JO30 | 70MHz | SSB, CW |
| 2008-06-21/22 | PC06M | JO21RM | 50MHz op: PE1RDP, PE1ITR | IARU 50MHz contest |
| 2008-08 | I/PE1ITR | JN54 | 144MHz | SSB |
| 2008-09 best DX | LX/PC5T/P | JO30 | 144MHz op: PC5T, PC5M, PE1BBI, PE1ITR | Contest SSB |
| 2008-10-17/19 | PE6SBW/J | JO21QK | HF-144MHz | JOTA 2008 |
| 2008-11-01/02 | PC5M | J021OJ | 144MHz | Marconi Memorial Contest 2008 |
| 2009-06 | PC06M | JO21RM | 50MHz op: PE1RDP, PE1ITR | Contest SSB |
| 2009-07 | PC06M | JO21RM | 50MHz op: PE1RDP, PE1ITR | Contest SSB |
| 2009-09 | PC5T | JO23 | 144MHz op: PC5T, PC5M, PE1BBI, PE1ITR | Contest SSB |
| 2009-10 | DL/PE1ITR | JO30DC | 432 and 1296MHz op: PA3CQE, PE1RDP, PE1ITR | Contest SSB |
| 2009-10-15/17 | PE6SBW/J | JO21QK | HF-144MHz | JOTA 2009 |
| 2009-11 | LX/PE1ITR | JO20 | 70MHz | MS JT6M, FSK441 |
| 2010-02 | PI9CAM | JO32 | 1296MHz EME | Contest SSB |
| 2010-05 | LX/PE1ITR/P | JO30AC | 432 and 1296MHz op: PA3CQE, PE1RDP, PE1ITR | Contest |
| 2010-06 | PC06M | JO21RM | 50MHz op: PE1RDP PE1ITR | Contest |
| 2010-08 | LX/PE1ITR | JO20XC | 70MHz and 1296MHz | MS JT6M FSK441 |
| 2010-09 | LX/PA1TK/P | JN39AX | 144MHz | IARU Reg 1 Contest |
| 2010-10 | LX/PE1ITR/P | JN39AX | 432 and 1296MHz | Contest |
| 2010-10-15/17 | PE6SBW/J | JO21QK | HF-144MHz | JOTA 2010 |
| 2011-03 | LX/PE1ITR/P | JN39AX | 432 and 1296MHz | Contest |
| 2011-04-09 | PI9CAM | JO32 | 432MHz EME | |
| 2011-04-17 | PE1ITR/PE1BBI | JO33 | FM-DX 88-108MHz | SWL |
| 2011-04-24 | PE1ITR | JO21QK | DAB-DX 175-230MHz | SWL |
| 2011-05 | LX/PE1ITR/P | JO30BA | 432 and 1296MHz | IARU Reg 1 Contest |
| 2011-06-18 | PC06M | JO21OJ | 50MHz | IARU Reg 1 Contest |
| 2011-07-02 | PC06M | JO21OJ | 50MHz | IARU Reg 1 Contest |
| 2011-07-24 | PE1ITR/PE1BBI | JO23OA | 88-108MHz FM-DX and 210-235MHz DAB | SWL |
| 2011-09-02 | PE1ITR/PE1BBI | JO23KE | 88-108MHz FM-DX and 210-235MHz DAB | SWL |
| 2011-09-03 | PC5T | JO23KE | 144MHz | IARU Reg 1 VHF Contest |
| 2011-10-01 | LX/PE1ITR/P | JO30BA | 432 and 1296MHz | IARU Reg 1 UHF Contest |
| 2011-10-14/16 | PE6SBW/J | JO21QK | HF-144MHz | JOTA 2012 |
| 2012-03-03/04 | PI4TUE | JO21RK | 432 and 1296MHz | IARU Reg 1 VHF-UHFContest |
| 2012-04-01 | PE1ITR/P | JO22HR | 70MHz | RSGB First 4m contest and FM-DX. Operators PE1ITR/PE1BBI |
| 2012-04-28 | SWL | JO30DQ | 88-108MHz | FM-DX swl expeditie |
| 2012-05-05/06 | PI4TUE | JO21RK | 432,1296,10368MHz | IARU Reg 1 VHF-UHFContest |
| 2012-06-16/17 | PA6TT | JO21OJ | 50MHz | IARU Reg 1 6m Contest |
| 2012-07-07/08 | PA6TT | JO21OJ | 50MHz | VERON 6m Contest |
| 2012-09-01/02 | LX/PA1TK/P | JN39AX | 144MHz | IARU Reg 1 VHF Contest |
| 2012-10-06/07 | PI4TUE | JO21RK | 432MHz, 1.3, 2.3, 5.7 and 10GHz | IARU Reg 1 UHF Contest |
| 2012-10-19/21 | PE6SBW/J | JO21QK | HF-144MHz | JOTA 2012 |
| 2013-02-09/10 | PE6SBW | JO21RK | HF | PACC Contest |
| 2013-03-02/03 | PA3CQE | JO21OJ | 1.3, 2.3 and 10GHz | IARU Reg 1 Contest |
| 2013-05-04/05 | PA3CQE | JO21OJ | 432MHz, 1.3, 2.3, 3.4 and 10GHz | IARU Reg 1 Contest |
| 2013-06-01/02 | PE1ITR/P | JO21WF | 70MHz | VERON 4m Contest |
| 2013-06-15/16 | PA6TT | JO21OJ | 50MHz | IARU Reg 1 50MHz Contest |
| 2013-06-30 | PA3CQE | JO21PL | 3400MHz | EME Contest |
| 2013-07-06/07 | PA6TT | JO21OJ | 50MHz | IARU Reg 1 50MHz Contest |
| 2013-07-27 - 2013-08-03 | MW/PE1ITR - M/PE1ITR | IO72WP and IO80OR | 144MHz | On vacation |
| 2013-09-07/08 Movie | PC5T | JO23KE | 144MHz | IARU Reg 1 144MHz Contest |
| 2013-10-05/06 | PA3CQE | JO21OJ | 432MHz, 1.3, 2.3, 3.4 and 10GHz | IARU Reg 1 UHF Contest |
| 2013-10-19/20 | PE6SBW/J | JO21QK | HF, VHF and ATV on 23/13cm | JOTA Jamboree on the Air |
| 2013-10-22/26 | IG9Y | JM65HM | 70 and 144MHz Meteor Scatter | Expedition to Lampedusa JM65HM |
| 2013-11-02/03 | PC5M | JO21OJ | 144MHz | Marconi Memorial Contest |
| 2013-12-28 | PE6SBW | JO21RK | 144MHz | School Contact International Space Station |
| 2014-02-08/09 | PE6SBW | JO21RK | HF | PACC Contest |
| 2014-03-08/09 | PE1ITR | JO21OJ | 434MHz/1285MHz | ATV Contest |
| 2014-04-06 | PE1ITR/P | JO33II | 70MHz | RSGB First 4m contest |
| 2014-05-03/04 | PE1ITR | JO21PL | 3400MHz | EME contest |
| 2014-06-07/08 | PE1ITR | JO21OJ | 70MHz | VERON 70MHz Contest |
| 2014-07-05/06 | PA6TT | JO21OJ | 50MHz | IARU Reg 1 50MHz Contest Part 2 |
| 2014-09-06/07 Movie | PC5T | JO23KE | 144MHz | IARU Reg 1 144MHz Contest |
| 2014-10-04/05 | PA6NL | JO21BX | 432MHz | IARU UHF Contest. Gast operator bij het 70cm station van PA6NL |
| 2014-11-01/02 | PC5M | JO21OJ | 144MHz | Marconie Memorial CW Contest. Test 3x9 12.5Ohm OWL Yagi |
| 2015-02-14/15 | PE6SBW | JO21RK | HF | PACC Contest 2015 |