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OH2BT Finland flag Finland

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Ham Member Lookups: 6964


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.htmlv



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.



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1392859 Last modified: 2014-10-30 21:31:32, 16467 bytes

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