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VA2OBW Canada flag Canada

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QSL: Direct, bureau, QRZ.com

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Ham Member Lookups: 16249




QSO is short, but QSL is forever!

Amateur radio has been a part of my life since my early teen years. I was first licensed in May 1987 as YO5OBW, then in November 2011 as VA2OBW.

I am a graduate of Polytechnic University Bucharest, Romania, in 1989 (B. Sc.), of "Ecole Polytechnique de Montreal", Canada, in 2001 (M. Sc. A) and 2004 (Ph.D.), and then of the "Institut National de la Recherche Scientifique - Energie Materiaux et Telecommunications", Montreal, Canada, in 2005 (postdoctorate).

I was with the National Company of Telecommunications, Rom-Telecom, Bistrita-Nasaud, Romania; RF Engineer and Head of the Telecommunications Laboratory from 1989 to 1993, and Technical Manager from 1993 to 1997.

Since 2005 I am university professor at the "Institut National de la Recherche Scientifique - Energie Materiaux et Telecommunications", Montreal (university for graduate studies, M.Sc. A. and Ph. D., located in the down-town of the city). My current research interests are millimeter-wave integrated circuits design and millimeter-wave transceivers operating over 60 - 90 GHz band (for communication, imaging, and radar systems). I am also an IEEE senior member (2013) and member of the IEEE Microwave Theory and Techniques Society (MTT-S).

As a HAM radio, I work most of the HF bands plus 6 m, 2 m, and 70 cm (SSB). My favourite bands are 40 m and 20 m.


My working conditions are:


YAESU FT-950 HF/ 50 MHz transceiver

         with ELECRAFT KPA 500 linear amplifier and KAT 500 automatic antenna tuner connected to the ANT1

         and MFJ-991B IntelliTuner (automatic antenna tuner) connected to the ANT 2

YAESU FT-857D HF/VHF/UHF ultra-compact transceiver

YAESU FTM 350 tri-band FM transceiver

KENWOOD 2m all mode transceiver, model TR-9130

KENWOOD TH-F6A mobile VHF/ UHF tribander








MFJ 1796 six-band vertical dipole (HF/ VHF) mounted on the chimney (dipole center at 15 m (50 feets) over the ground);

Comet 333 tri-band vertical base station antenna (VHF/ UHF) mounted on the same chimney. The two vertical antennas on the chimney are spaced by 2.4 m (8 feets) horizontally.

A home-made 40 m horizontal delta loop of 43.8 m lenght is installed on my condo roof at approximately 12.75 m (42 feets) over the ground. The delta loop antenna uses a HI-Q balun having 4:1 ratio (mounted in my case on the NE corner of the antenna, as seen in the below picture). The balun is connected to the shack using 50 ohm coaxial cable type RG 213.

I also use occasionally my attic antennas: two tri-band dipoles D3 and D3W from Cushcraft (beaming NE / SW), a MFJ 1788 magnetic loop (beaming NE / SW), and an inverted V G5RV (oriented NE to SW).


If you are interested, SWR measurements of my antennas are available in the bottom, after the shack and the antennas pictures.


If we have worked each other I thank you for the QSO and look forward to more in the future. If we have not, I hope we do so soon.

73 from the beautiful city of Montreal!


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Thank you for your beautiful QSL cards - I love them !

My radio shack:





My outdoor antennas:

 General view of the roof antennas: horizontal delta loop for 40 m and HF/ VHF/ UHF verticals

Detailed view of the vertical antennas

      front: MFJ 1796 six-band dipole (HF/ VHF) / back: Comet 333 tri-band base station antenna (VHF/ UHF)

My attic antennas:

Under the roof 2 x tri-band dipole system (D3 and D3W, from Cushcraft) and inverted V G5RV

   The parallel dipoles are spaced by around 1.8 m (6 feets) horizontally. The under the roof G5RV is perpendicular to the dipoles.

 Another picture of the D3W; back of the previous picture of parallel dipoles:

MFJ 1788 magnetic loop (6.8 MHz to 23.8 MHz continuous tuning, with remote control in the shack) in front of D3:

Another magnetic loop: BABY LOOP by CIRO MAZZONI RADIOCOMUNICAZIONI (6.6 - 29.8 MHz) I3 VHF

in my RF lab at the university



   YO5/VA2OBW portable in his home town Bistrita, North of Romania, summer 2014 and 2016


Equipment: YAESU-FT 857D powered by 12 V car battery, and MFJ 949E manual antenna tuner

Antennas: full size G5RV (2014) or ZS6BKW (2016) in the back yard at 10 m high and attic G5RV junior for indoor operation


Field days (2014):

Portable transceiver:

G5RV antenna (2014):

ZS6BKW antenna (2016):

Indoor set-up (2016):

Attic G5RV junior:


SWR measurements:

I. MFJ 1796 vertical HF/ 50 MHz/ VHF dipole (7, 14, 21, 28/29, 50, 144 MHz):

II. Comet 333 tri-band vertical VHF/ UHF antenna (144, 220, 440 MHz):

III. roof mounted 40 m horizontal delta loop (7,14, 21, 28/29 MHz) with 4:1 balun:

IV. attic tri-band dipoles D3 and D3W:

D3 (14, 21, 28/29 MHz)

D3W (10, 18, 24 MHz)

V. MFJ 1788 attic magnetic loop:

        The magnetic loop has continuous tuning from 6.8 MHz to 23.8 MHz, using a remote control in the shack.  

         Typical SWR measurements on three HAM bands are plotted below:

        a) magnetic loop tuned at 7.150 MHz

       b) magnetic loop tuned at 14.175 MHz

        c) magnetic loop tuned at 21.225 MHz


      d) Smith chart, magnetic loop tuned at 14.200 MHz


VI. attic G5RV:

      a) direct connexion of the G5RV feeder via a low loss 75 ohm coaxial cable (satellite antenna type) to the transceiver (or antenna tuner) 

        b) with a MFJ-907 RF transformer connected between the end of 75 ohm coaxial cable and the transceiver

            (acts as a wideband pre-tuner; see the 21 MHz and 28/29 MHz bands SWR improvement):

   The G5RV attic antenna (without RF transformer) is easily tunable in 3.5, 7, and 14 MHz with the transceivers' internal antenna tuner. However, for simplicity, I use the MFJ-991B IntelliTuner (automatic antenna tuner) without the RF transformer for all HAM bands from 3.5 MHz to 28/29 MHz. The G5RV antenna is connected to the ANT2 input of the Yaesu FT-950 transceiver.


a) dipole of 2 x 14 m @ 10 m high at both ends, black insulated flexible antenna wire

b) 11.45 m cable of 450 Ω characteristic impedance (JSC wire & cable 1318, 18AWG solid); velocity factor approx. 0.85 according to the theoretical length of 13.33 m (VF=1)

c) W2AU UNADILLA dipole balun 1:1 at the end

d) 50 Ω cable to the transceiver or antenna tuner (any lenght)


I am a supporter of the DX Code of Conduct:

I will listen, and listen, and then listen again before calling.

I will only call if I can copy the DX station properly.

I will not trust the DX cluster and will be sure of the DX station's call sign before calling.

I will not interfere with the DX station nor anyone calling and will never tune up on the DX frequency or in the QSX slot.

I will wait for the DX station to end a contact before I call.

I will always send my full call sign.

I will call and then listen for a reasonable interval. I will not call continuously.

I will not transmit when the DX operator calls another call sign, not mine.

I will not transmit when the DX operator queries a call sign not like mine.

I will not transmit when the DX station requests geographic areas other than mine.

When the DX operator calls me, I will not repeat my call sign unless I think he has copied it incorrectly.

I will be thankful if and when I do make a contact.

I will respect my fellow hams and conduct myself so as to earn their respect.




7748852 Last modified: 2016-12-09 21:33:27, 18363 bytes

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Public Logbook data is temporarily not available for this user
United States Counties Award#3974
Granted: 2016-08-10 20:08:01   (VA2OBW)

  • 100 Counties Mixed
  • 100 Counties Phone
DX World Award#2316
Granted: 2015-07-25 04:54:52   (VA2OBW)

  • Mixed Phone
Grid Squared Award#2985
Granted: 2015-02-14 10:50:02   (VA2OBW)

  • 10 Meters Mixed
  • 15 Meters Mixed
  • 20 Meters Mixed
  • 40 Meters Mixed
  • 10 Meters Phone
  • 15 Meters Phone
  • 20 Meters Phone
  • 40 Meters Phone
World Continents Award#3471
Granted: 2015-02-14 10:40:05   (VA2OBW)

  • 15 Meters Mixed
  • 20 Meters Mixed
  • 15 Meters Phone
  • 20 Meters Phone
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