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YO5PBG Wavelenght

Amateur Radio, QRP, Home Made

Tag Archives: amateur radio

Hello friends. Almost 2 years since my last post here. I was busy with drinking beers, University, my job and learning new things that fortunately relate to my old hobby (radio-communications) and that is “C” programming with Arduino platform. The following picture depicts my last project.  A project that will help me, I hope, in making faster and better the work related to amateur radio. I learned alot from it: programming, precision mechanical assembling, CNC insights. In the last two years I was not quite a stranger to Amateur Radio. I made my own automated antenna rotor, DDS with several transceiver related functions and even an HF antenna analyzer – all based on Arduino. Hope I will have time to dedicate a little of it, again, to what gained years ago my interest.




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A nice sunny day until I packed all necesary things except one of the most important — the Keyer. The clouds arived just when with my friend Zsolt — YO5PCP started in a little search for a nice – opened location near my town (Baia Mare), good for VHF portable operating this summer (see the photo album below). Of course we have a lot of very nice views near, but with pure luck we discovered this one (in the images below) at only about 8km away from my base location.

I was prepared with the little CW-SSB transceiver that I’ve created some days ago for use with transverters, a 12V-7Ah gell battery, transverters for 50MHz and 70MHz and a vertical aluminium antena mounted on a tripod at about 2 meters above ground.

I was dissapointed to hear some stations from Israel on 6m (CW) and not to have the precious keyer around.

Than, with a booming SSB signal apeared on the band Mike, SV5BYR. I called him just with about 3-4watts, with the antenna in a random position (as we where preparing to go), in hands of Zsolt. We exchanged a short report.

This was just a search, just a little test (half hour). We can get here easy by bikes, with “easy” load… Equipement and antenna are about 5kg weight and the beer 2,5 ~ 5Kg too.No other stuff needed.

(Click to enlarge images)

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Yesterday I made a noise blanker. The only one I’ve made.
You may find that very few homebrew transceiver designs have this option, an option that may be of much more importance than the AGC for example.

My NB PCB is about 30×20 mm (click to enlarge)

Noise Blanker

Noise Blanker

From my new location, where I use just a vertical “balcony” antenna at the moment, I was very surprised of the amount of noise (just above 59!!! on my S’Meter) on 28, 50 or 144MHz that apears every day, at random hours, without regard of season. I never realised that I could get rid of this electrical noise that mask completely even very good CW or SSB signals.

And another picture, the noise blanker and the PCB for a little varicap controlled VFO that I’ve “painted” also yesterday  (click to enlarge)


At least! The Mizuho style noise blanker did it! Only three transistors some fast Schottky or Germanium small signal diodes in this simple and efficient design!
And it is driven with 10,7MHz IF (in Yaesu designs, you need another two stages: a mixer and a local oscillator for converting the IF to 455KHz).

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Here are just 2 pictures of bad quality (excuse my old superslim Panasonic camera) from my hamshack as of May 2010. It is jus a part of what it shoud be… And a lot of lack of space :-).

Most of the equipement is home made.

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I’m very glad to announce that romanian amateur radio stations are licenced since now to work on the 70.000 – 70.300 MHz band. Looks like YO stations interested must ask for permission to use this new band to the Romanian Ministry of Defense.

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So, I’m very glad to inform my readers that my Amateur Radio site is back after about 6 months.

I just uploaded the site to the new server but i did not make any other settings (i’ll do it this days).

Just now I’m very busy to post something new there, maybe next week I’ll start. For a while I also want to see if I encounter major problems on the new server.

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It should be a secret. But I hope that those who (will) read me, should know. Hope it is helpful this personal HOW TO.

So, QRP means less than 5W, let’s say less than 25 Watts, but not more. OK?


Why do I use QRP (at home, or portable)? Because I design my own transceivers and accesories. I never had power transistors, until recently when I received some 25W power transistors @ 24 Volts for 432MHz, 25W for 50MHz (both integrated into two Power Amplifiers for the specified bands) and some higher power trasistors for HF (not used yet because I don’t have a good power supply for them). 

“Operating QRO” with QRP transceivers?

Yes! 5 watts can beat 1kw. For this you must be a good operator. (And a good antenna, if posible)

I don’t consider myself an extra one, but, I cannot be modest. I have my tactics, learned from my logical aproach, by personal experiences.

  • 1. I don’t use clusters, just rarely. You must always be there. You must feel the air, the band. You must be there, almost always. Also in your dreams.
  • 2. Never say “I cannot work a weak DX”! I said so when I first heard Japan on 50MHz, and I missed it in my log. The other day I worked Hong Kong on the same band with 2watts and a dipole. You must call, call, and call. Don’t be frustrated because of your low power.
  • 3. Use your hands continously. Now on the speed pot. of your keyer, than on the frequency dial.  Propagation and the other side operator are the factors here. For example, i copy better high speed CW if louder the signal. Better I copy some CW tone than other. Some propagations allow only QRS others only high speed CW to be corectly copied.
  • 4. A technical problem: test, retest, experiment antennas! (The only thing I did’nt for long time)

Good Luck QRP’ers!

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