dinsdag 17 november 2015

PA0O with WSPR on 160 m

Here is an analysis of very interesting WSPR spots, that were made by Jaap PA0O. The spots were made from the 19th of oktober until the 12th of november 2015. The band was 160 meter. To reduce the length of the table, I only listed the stations that received more than 60 spots.
The strongest signal was received by G8DYK over a distance of 600 km. The longest distance was 6400 km, to N8OQ.

The lower the Calculated lowest possible power, the stronger the signal.
A Calculated lowest possible power of 1 milliwatt, means that a signal with a power of 1 milliwatt, should be received with a SNR of -29 dB. This is a solid copy in WSPR.

Spots over 2000 km or more.
Thanks Jaap for the interesting data.

dinsdag 10 november 2015


I very much like to answer a SWL card, because I know that my card is very much appreciated. In the eQSL Inbox, I found a very nice card, from a SWL station.

Juan  EA4851URE confirms the QSO of PA1B with 6V7S - Op. RK4FF
Juan EA4851URE  -  SWL confirms my QSO that with 6V7S from Senegal, West Africa.
The QSO with 6S7V is made with 2.7 W over a distance of 2852 Miles and is good for 1056 Miles per Watt. hi. Thank you Juan for your beautiful eQSL.

maandag 9 november 2015

SWL R4A-1227 confirms 36 mW QSO

It's great to receive a QSL of a SWL station. In the last batch of eQSL's I found a eQSL from Valentin R4A-1227 hat really knocks my socks off. This eQSL is very special, because of the very low power, that I used. I made a QSO with MU0RGU. The signal was very strong, so I decided to answer with 36 mW. The QSO was heard by Valentin R4A-1227.

36 milliwatt
R4A-1227  -  36 mW  -  1734 Miles  -  48,180 Miles per Watt
Miles per Watt
This SWL report and the QSO with M0RGU are both good for more than 1000 Miles per Watt.
PA1B to  R4A-1227  over 1734 miles to LN28gm with 36 mW gives 48180 Miles per Watt.
PA1B to  MU0RGU: over  378 miles with 36 mW gives 10496 Miles per Watt.

Thank you Valentin for the very special eQSL. FB.

zaterdag 7 november 2015

Tuning the cylinder dipole

Cylinder dipole PA1B

In the photo you see the cylinder dipole with open Monster cans. The cans are connected to the coil. I made radial cuts in the top and the bottom of the cans and I bent the points inwards. Later I pushed the white tube, which has a diameter of 40 mm, through the holes. The coil is hanging below the cans and the tube.
This coil has 9 turns on a PVC tube with a diameter of 80 mm. The distance between the cans is equal to the diameter of the cans and is 65 mm. The distance between the cans is not fixed, but can be made smaller by shifting the cans.

On both sides of the coil I have attached a single turn, coupling loop. The loops are lightly coupled to the coil. One loop is connected with the RF generator. The other is connected to the oscilloscope.
It's very simple to measure the resonance frequency of the cylinder dipole. By adjusting the frequency, I just peak the signal on the oscilloscope to determine the resonance frequency.

Open cans
In this cylinder dipole I use open cans, because they show less capacity between the closed tops of the cans. This capacity does not contribute to the current on the surface of the cylinders.
The cylinder dipole with the open Monster cans and the 80 mm coil with 9 turn, resonates at 18.9 MHz. This is a higher frequency of the closed monster cans, which resonates at 16 MHz. The capacity of the open can is lower than the capacity of the closed cans and also because the cylinders are further apart.

I use the Cylinder Dipole on 21 MHz and 14 MHz as an indoor antenna in CW contests.

zondag 1 november 2015


1 November startte als een mistige dag. Maar na het ontbijt was het zonnig. We maakte een prachtige wandeling langs de Kromme Rijn bij Rhijnauwen. We hebben genoten.

Langs de Kromme Rijn tegenover het Pannenkoekenhuis
Brug bij Bunnik
Bij Rhijnauwen.