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JP1HUJ Japan flag Japan

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Hi YLs/OMs,

I am Koji Oyama, operate JP1HUJ and AI7HU, live in Tokyo, Japan. I got my first ham radio license in 1983 when I was a junior high-school student, 13 yeras old, lived in Ibaraki which is located 60 km northeast of Tokyo. I had been enjoying QSOs mainly on 6m SSB band at that time. However, my ham activity should be stoped by a personal reason when I moved to Tokyo.

But in June 2009 ...  I was back here !

In the beginning phase of my restarting ham activity, I had reminded to enjoy 6m DXing by using a 10watts-power transceiver and a 8m-height homebrew fork-hentenna. Next, I started CW operation from Sept. 2009 by taking a new CW license on July 2009. After that, I got 2nd class and 1st class Japanese amateur radio licenses, and finaly, got US FCC general and extra licenses in order to extend my ham activities not only in domestic but also to global so that I can make a lot of friends over the world.

Recently, I am crazy about SDR, CW, D-star, DX vacation, and DX contesting. I can never get tired of it because there are lots of things to find new technologies day by day.

Viva Ham radio ! See you on the air !



To: Russian Stations

I don't know Russian language very well, many Russian / East Europe stations tease me regarding the suffix of my call sign. Some stations sent "FB CALL" during CW QSO and some stations reported my call to DX cluster with commnet of "FB CALL" or "Good suffix !"

Now, I would like to inform you my call sign was systematically assigned by Japanese governmental agency. You know there is no vanity call system in Japan, Therefore, I have been using my call sign for a long time since 1983.

I never look for trouble and I have no sense of barnyard humor, however I never change my call because I love my call sign.


-- Koji


[DX vacation]:

1. Aug.,2013 in Guam: KF7QCZ/KH2 ==> Link

2. Aug. 2014 in Kota Kinabalu, Sabah, East Malaysia: 9M6/JP1HUJ ==> Link

3. Aug.,2015 in Saipan, Mariana Islands: AH0/AI7HU ==> Link


[My antennas]:

80m: Isotron antenna. Alpha Techno xxx (December 2010 - present)

40m/20m/17m/15m/12m/10m: V-type Dipole antenna. COMET H-422 (December 2009 - present)

6m: 6 element Yagi. Creative Design CL6DX (May 2016 - present), homebrew fork hetenna. (June 2009 - Feb 2013)

70cm: 15 element Yagi. DIAMOND A430S15R (Sept 2013 - present), Mobile Whip antenna (Sept 2009 - Feb 2013).


new antenna system in 2016

Antenna system in 2009



[My tranceivers]:

Main rigs:  I bought these new rigs by convincing my wife:

80m/40m/30m/20m/17m/15m/10m/6m: Kenwood TS-590 (CW, running 100watts)

80m/40m/30m/20m/17m/15m/10m/6m: FlexRadio FLEX-6300 (Reciever Only)

70cm: ICOM ID-31 (FM/DV(D-star) + HL-60U(booster), running 50watts)

Secondary rigs: these are very old but still working:

40m/15m/10m: Yaesu FT-101ZSD (CW/SSB, running 10watts)

6m: ICOM IC-551 (CW/SSB/AM, running 10watts)

2m/70cm: ICOM IC-2410 (FM only, running 10watts)

[My CW keyers]:

Straight Key: Hi-Mound HK-701

Electric Key Paddle: GHD Key GN807

PC Interface: USBIF4CW




Dongle: DV-Dongle + DELL PC (no radio transmission)

Hotspot: DVMega + Arudino + Raspberry Pi 3 (under applying for qualification the equipment to use it in Japan)


[Radio Licenses]:

November 1982: Japanese Amateur Fourth-Class (ex. Phone-Class) Radio Operator was certified

January 1983:  Japanese Amateure Radio Station JP1HUJ @Ibaraki, Japan was licensed

July 2009: Japansese Amateur Third-Class Radio Operator was certified

September 2009: Japanese Amateure Radio Station JP1HUJ @Tokyo, Japan was licensed again

June 2010: Japanese Amateur Second-Class Radio Operator was cerfitied

October 2010: Japanese Amateur First-Class Radio Operator was cerfified

May 2011: FCC Amateur General-Class license was cerfitied and got the call sign KF7QCZ

November 2013: Japanese Amateure Radio Station (Fixed: max 100 watts) JP1HUJ was licensed

May 2014: The fixed station JP1HUJ was upgrade to output 200 watts @Tokyo, Japan

July 2014: FCC Amateur Extra-Class licensed was cerfitied and upgrade KF7QCZ

August 2014: Amateur Radio Class A Station 9M6/JP1HUJ @Inanam, East Malaysia was licensed

April 2015: Changed FCC call sign to the vanity call AI7HU

[My lovery children]:

I have 2 daughters.


mothers day in 2009



1 year old birthday of my 2nd daughter at Tokyo Desney Land in December 2009.


[A sample of my QSL cards]:


7361348 Last modified: 2016-06-05 05:55:33, 17757 bytes

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