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OH2BT Finland flag Finland

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Ham Member Lookups: 9599


Main interests in hamradio:

Constructing rigs.



1956 First ham receiver: Superheterodyne with 3 valves (age 13y. Caution for parents. 250V inside ! )

1958 BC454. Surplus commando receiver covered and with mains PSU

1960 BC454 with integrated multiband converter + Xtal filter + PSU

1962 AM TX with Geloso VFO + 807 + 813 + 2xEL34 modulator. Full BK

1963 SSB package TX under construction. There is a mess of components on the table.

1968 New transceiver under construction

1974 Agent OH2BT and home brew 2m agent walkie talkie

1978 Small passive grid linear amplifier with 3x RCA 8121 tubes in class AB1. Drive power needed is 1 W for 450 W

1995 Small 3.5 MHz ARDF receiver. DIY with SMD components become a must also for me. ARDF become at once one of my favourites. http://ardf.pp.fi/ARDF/english.html

2006  Last DIY transceiver from year 1983 was upgraded with VU3CNS designed DDS VFO



Ham radio fox hunting (ARDF)

Participating veteran class. I prefer to jog the track instead of running.

In the page top picture you see my 80 meter fox hunting receiver in use. That time I was logging hydrogen balloon beacon coordinates during SRAL field day.

In the picture of the table there are all participant's receivers left guarantine before the start of Estonia-Finland fox hunting competition. Mine is the one with the blue belt for nec hanging


3.5 MHz fox hunting receivers ready for competition. 2 receivers are constructed by me


A project in SRAL field day - "ILMARI" 1998:

- 2 hydrogen balloons

- parachute and radar reflector

- box for telemetry and beacons

- army 1.6 GHz radiosond.

Telemetry and APRS data was possible to record from the start to the final landing. More details are available in http://www.oh6vm.org/ILMARI/kuvia-e.html



  I like to generate a kind of story of the (edited) pics and audio or video files connected to these pics.

Here are some examples of my favourite DRM TX pics





Informative graphic pasted for instance on glamour girl pictures.

Do you identify the ladies ?


QRP and specially QRPp

500mW and even 10mW.

10mW just lights a led in parallel with 50 0hm co-ax cable. During superior sunspot conditions and with a giant eared partner having a gainfull antenna a transatlantic or pacific QRPp QSO is a fascinating target.

I have worked JA4FKX with 10 mW output

In 2013 ARCI Spring QSO party I worked K0ZK, KD2JC and KX9X using 50 mW

KX9X was working in his car in ARRL parking lot using 3W and mobile whip.

Still hunting a pacific QSO with 10mW

2014 worked VE2WU with 10 mW. Marten reported 599. Must be because of his big ears , antennas and good ionospheric reflections

Think 10 mW - a torch lamp is having a huge 3W power

A normal strong man can maintain 70 watts with a bike generator but swetting after a while


This is my DIY shotgun for QRPp fun

Battery pack - Transmitter - Keyer in a cigar box - Iambic key and a mini SK from WWII bomber

I stopped smoking 1983 and empty Shimmelpenninck cigar box was free for C-mos el keyer


Here is the pipe of my shotgun.for QRPp fun

I named the TX: Ex f Ex 10/20 - Extreme fun Experiences 10mW to 20 mW

Conventional mechanically rigid and thermally compensated VFO with vernier knob

2N1613 pa stage pcb on top of the VFO

Switch over type reed for antenna TR switching


5 el yagi and the rotator are installed into a simple lift.

Because of the lift a "gentleman" antenna needs only a single man to maintain.



free counters


7326289 Last modified: 2016-05-20 06:26:28, 18818 bytes

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QRZ Logbook Summary for - OH2BT
Latest Contacts for OH2BT at QRZ.com
dedateband mode grid Country op
IK2LFF 2016-07-16 20m SSB JN45kw Italy MARCO RINALDI
DG5BKM 2016-07-15 20m SSB JO53ar Germany Marko Kasper
IK2SOB 2016-06-09 20m SSB JN45rp Italy Fabio Cristoforoni
ON3EI 2016-06-02 20m SSB JO20aw Belgium W Elsie
OH2LZC 2016-06-02 20m SSB KP20ee Finland Niko Arola
OH6HBL 2016-06-02 20m SSB Finland
OH9RJ 2016-06-02 20m SSB Finland Aaro Hyvarinen
OH6EP 2016-05-21 80m SSB Finland
OH3NAO 2016-05-20 160m SSB KP20tx Finland Kalevi Kuukso
OH3HP 2016-05-20 160m SSB Finland
OH2EDC 2016-05-20 160m SSB KP20no Finland Oiva Soini
OH1AXT 2016-05-20 160m SSB KP10tj Finland Markku Humaloja
2E0RMV 2016-05-17 20m SSB JO01pf England Julian K Jules Vine
OH4LA 2016-04-07 10m SSB KP20lg Finland Pasi P. Huumo
OH3KJM 2016-04-01 160m SSB KP11hv Finland Jari Myllymaki

Book Totals: 683 qso's   246 confirmed Get a free logbook at QRZ.COM

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