NEWS: Uploaded to new web site September 17'th 2009. Minor adjustments.
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My name is Ole Nykjśr. I got my amateur license in 1966 and my interests
has always been in designing, building/modifying equipment and to a lesser
extent operating - especially on VHF and above frequencies.
New designs are added from time to time, so you may want to revisit this site.
Interference problems in contest
A note on interference, splatter etc. What can be expected from good and bad equipment. How to test for broadband noise from transmitters and phase noise in receivers.- see here.
Home building is what I enjoy most. To me it's always rewarding to
build a new piece of equipment and have it perform to expectation.
Or to improve on an old circuit.
I like designing and building antennas. (-this is also what I do for a living).
Here are a few designs:
Mostly for the fun of it, I have made a curve of stacking distances for yagi's based only on the length of the boom. By combining already published formulas from Kraus W8JK, Bertelsmeier DJ9BV and Rothammel Y21BK, I arrived at one universal stacking graph.
I built the OX3VHF combined 6 meter
and 2 meter beacon. It was shipped to Greenland many years ago, and is
now only active on 6 meter. There are new plans for a high power
beacon from OX - land.
Listning to beacons is very useful for checking out conditions. But "looking"
at beacons using a PC with a suitable FFT program, can give you much more
Filters and combiners
Antenna combiners for VHF/UHF.
A study of calculation methods for deriving the caracteristic impeadance
of a coaxial line with square outer conductor and round inner conductor.
Now here is a topic to fill a book! I have designed many during the years,
so here are descriptions of a few:
How I made a Power Meter from a surplus power sensor.
Here are descriptions of some Power Amplifiers I've build:
Other PA designs to be uploaded soon: 80W PA for 50 MHz with BLV38.
I have commercially build equipment too. If I was to build everything
from scratch, I should never have been QRV on all the bands from
1.8MHz to 24GHz. However most of it is quite old and heavily
modified to add or increase performance.
Modifying commercial equipmentBefore starting any modification, you should ask yourself why you want to do the change? - and how you plan to do the job.
I've often wondered why people who just bought a new rig, immediately put out a request on packet: "Any mods for ICOM/YAESU/KENWOOD model xyz?" - as if they bought the wrong station and now wanted something else.
Still there is a lot you can do to older equipment to improve or add new performances, being old they are also easier to work with and the results are more marked. With all modifications, it is important that you are able to verify which improvements have really taken place.
Living in a populated areaFor me - as for many other amateurs - this is a fact of life. And with that comes the problems with TVI, interference to telephones and from computers - and the list goes on! This is really a two way street.
I shall have comments an experiences on this subject too.
Please write to me if you have comments or questions, and given the time I'll answer every E-mail that arrives in my mailbox firstname.lastname@example.org