1 milliwatt QSO’s
Over the years I made many QSO’s with very low power. But I only made a few QSO’s with 1 milliwatt. The QSO’s with RT6A over more than 1500 miles and with RU1A over more than 1000 miles, are both good for more than ONE MILLION miles per watt.
Click (on the cards) to read the interesting stories of the four 1 milliwatt QSO’s >>
NAQCC 1000 Miles per Watt Award
For years I am a member of the NAQCC. (#2038) The NAQCC club activities are dedicated to QRP/QRPp operation, using CW. When I visited the Award page in August 2011, I got excited by the extensive Award program for QRP and QRPp. Over the years I have made hundreds of confirmed QSO’s with more than 1000 Miles per Watt, but until now, I had not yet applied for an award. So I decided to apply for the 1000 MPW Award. I choose to apply for the QSO with the highest Miles per Watt. This QSO with RT6A was made in the Russian DX contest in August 2007. A few days later, I received the beautiful NAQCC Simple wire antenna 1000 Miles per Watt Award, sent by e-mail, from the Award manager, Rick AA4W.
Check out the interesting Awards of the NAQCC >>. Sri CW only.
Take a look at the winners of the Awards >>. (PA1B #114)
Click on the Award, to read the interesting details of the 0.85 mW QSO >> with RT6A.
1000 MPW QSO’s
The lower the power the higher the Miles per Watt score
Using very low power, I make many QSO’s with more than 1000 Miles per Watt. After many QSO’s with 50 mW or less, I realized that I had breached the ”1000 MPW boundary” many times.
From the Netherlands to Canada or the USA with 2.5 W is good for a “more than 1000 Miles per Watt QSO”. A QSO with 1 watt to Moscow over 1300 miles will do. But don’t think that you need a very long distance for a ”more than 1000 miles per watt” QSO. From The Netherlands to Germany over more than 50 miles, with 50 mW or to France over more than 100 miles, with 100 mW is also good for ”more than 1000 MPW”. The lower the power the higher the Miles per Watt score. hi
Calculate your Miles per Watt.
Calculate the distance with the fantastic “Miles per Watt calculator” by N9SSA.
Copy the two QTH locators and paste them, one by one, into the fields ”Grid-Square”.
Fill in the power in the field ”Watts”. (give 0.05 for 50 mW)
My QTH locator is JO22na
If you are interested in Miles per Watt – I found a the N9SSA Distance and MPW calculator on the QRZ.COM.hr page by Miša, 9A4TA:
Click here for the – N9SSA Distance and MPW Calculator >>
Determine your QTH
First determine your QTH locator with the excellent:
Find your QTH locator by F6FVY Laurent Haas.
Zoom in on your city and then click on your street to find your QTH locator.
Press the button ”Calculate Distance” and be surprised. (hi)
My 1000 Miles per Watt QSL card
For more than five years, I send a special ”more than 1000 Miles per Watt QSL card”, for many ”more than 1000 Miles per Watt QSO’s” that I make.
Read further about my special 1000 Miles per Watt QSL card >>
The QRPARCI ”1000 MILES PER WATT” AWARD
If the calculation gives more than 1000 Miles per Watt you can apply for the 1000 Miles per Watt Award that is issued by QRPARCI. This Award is issued to amateurs that RECEIVED or MADE a QSO with a QRP station that exceeds 1000 Miles per Watt, calculated from the power of the QRP station. You can apply, even when you are using QRO or as SWL.
Learn here more about the rules for the Awards >> of the NAQCC.
Confirmed countries in QRPp
Over the last years I have received many QSL-cards for QSO’s with very low power, to many DXCC countries. Feel free to have a look in the PA1B QRPp mW DXCC country list, which can be viewed in format.
Notice that this list is only for DXCC Countries confirmed in QRPp.
Over the years I noticed that the conditions are declining. Sometimes I need more power for the same run of contest QSO’s than a few years before. But the good news is that milliwatting and making QSO’s with more than 1000 Miles per Watt is still possible in EVERY contest. Check out here the influence of the conditions on the Lowest Possible Power, in this spectacular overview of
confirmed QSO’s per year >>.
How I started
When I started as a HAM on HF, I built my first transceiver myself. I had great fun with this homebrew CW QRPp transceiver the (HM7 >>). The rig comes from “Solid State Design for the radio amateur” page 214…218. In the 10 years that I used this CW transceiver, I worked many European countries on 7 MHz with a power of only 500 milliwatts in many normal QSO’s and many contest QSO’s. Homebrew, QRP and CW (Morse code >>) is a fabulous combination.
After I had worked with this transceiver (HM7) for a half year, I met Piero I5FPJ from Florence. After I mentioned that I worked with 1 watt, Piero reduced his power. I noticed, that when Piero went from 100 watts to 3 watts (-15 dB), the signal was less loud, but the readability of the signal was still good. Only the background noise was stronger. When Piero went from 3 watts, via 2 watts to 1 watt (-5 dB), I noticed that the signal strength only reduced a little bit. And when we were both running 1 watt, the signals were still good, with only more noise in the background. With this knowledge, I reduced the power of the HM7 from 1 watt to 500 milliwatt, a few months later.
In 2001 I bought a Yaesu FT-817. The power is adjustable from 5 W, 2.5 W, 1 W to 500 mW. Most of the time I use to the lowest possible power and increase the power only when necessary. At home I use an inverted V >> with a 300 ohm ribbon as feeder. The antenna match-unit is a homebrew symmetrical tuner.
To reduce my power further when possible, I built an attenuator of 10 dB and 20 dB. I noticed that for a QSO with 500 mW the received signal must be 599 or stronger. When signals are S9 plus 10 dB I can reduce my power to 50 milliwatts using the rig with an output of 500 mW and an attenuator of 10 dB. (10 dB reduces the power from 500 mW to 50 mW)
Being familiar with 500 mW, the step to QRPpp is easy. QRPpp is a (not official) term that I use for a power lower than 100 milliwatts.