PE4KH Amateur radio - Koos van den Hout

Most recent QSO's for PE4KH

Callsign Band Mode Locator RST(R) RST(S)
RA3MBG20MFT8KO96-15-02
IU8FRE20MFT8JN70+06+08
UA3AGY20MFT8KO85-12-13
EA5LH20MFT8IM99-13-24
A92AA20MFT8LL56-17-09
R8AEF20MFT8LO94-18-23
UX8ZA20MFT8-13-16
UA6HBJ20MFT8LN04-12-03
RC6AA20MFT8KN96-05-13
UT0IL20MFT8KN88-08-03
EA5RA20MFT8IM99-12+00
2E0EGS40MFT8IO93-14-16
UT2MA20MFT8KN98-05-18
RA9LL20MFT8MO27-20-24
9A6T20MFT8JN75-08-11

I passed my novice radio amateur exam in March 2013 and I registered the callsign PD4KH (pappa delta four kilo hotel!). I passed my full radio amateur exam in March 2016 and I registered the callsign PE4KH (pappa echo four kilo hotel!).
PE4KH on qrz.com
PE4KH on hamqth.com

I am usually located around maidenhead locator: JO22NC

QSL policy for PE4KH

I upload logs to eQSL.cc during and after being active on the radio. I upload logs to ARRL Logbook of the World, www.qrz.com and clublog on a regular basis. I like paper cards via the QSL bureau so I send those out when requested or when I think the other party will appriciate one and I will respond when I receive a card. You can also request a card via the Log Search on clublog for PE4KH using the OQRS service. Notifying me via e-mail that you would like a card is also possible.

I appreciate SWL reports for QSOs.

gallery of eQSL cards received by PD4KH, PE4KH, PE4KH/P, DL/PE4KH.

Articles

Antenna rotor project
Amateur Satellites
D-Star digitale amateur radio (Nederlands)

Maps

Recent contact (QSO) map for PE4KH embedded using google maps
Mapped 2m contacts by PE4KH gridsquares contacted (red) and confirmed (blue)
Mapped HF contacts by PE4KH gridsquares contacted (red) and confirmed (blue)
Mapped 10M contacts by PE4KH gridsquares contacted (red) and confirmed (blue)
Mapped 15M contacts by PE4KH gridsquares contacted (red) and confirmed (blue)
Mapped 17M contacts by PE4KH gridsquares contacted (red) and confirmed (blue)
Mapped 20M contacts by PE4KH gridsquares contacted (red) and confirmed (blue)
Mapped 30M contacts by PE4KH gridsquares contacted (red) and confirmed (blue)
Mapped 40M contacts by PE4KH gridsquares contacted (red) and confirmed (blue)
Mapped 60M contacts by PE4KH gridsquares contacted (red) and confirmed (blue)
Mapped 80M contacts by PE4KH gridsquares contacted (red) and confirmed (blue)

The 'hamradio' items from my homepage

2018-05-25 Going full duplex with amateur satellites, part 13: receiving a lineair transponder / SO-50 without the preamp
This evening another try, this time without the preamp. And tried receiving a lineair satellite.

This makes things even more complicated as I have to look at one display (gpredict) to have an idea where to aim the antenna and another display (gqrx) for the waterfall display. Maybe both can be on the same screen with a lot of resizing.

The first pass I tried was a pass of the FO-29 satellite which has a lineair transponder. It was not a very high pass so all reception was through a house. I did hear morse first, and later saw signs of USB signals in the passband. Signals were weak and noise was high. I was almost able to understand one callsign, a 9A.. callsign (Croatia).

The other pass I tried was a pass of the SO-50 satellite which is a narrow FM satellite. Signals were weak for narrow FM so I had to keep turning the arrow antenna to get the polarisation right. I could hear spanish and english callsigns.

I recorded the SO-50 pass and noted the audio looked very distorted in audacity. Maybe I can improve the audio somewhere in the chain and get things better.

2018-05-24 Going full duplex with amateur satellites, part 12: picking it up again
So last year I wanted to get back on amateur satellites and bought some hardware that would enable me to go full-duplex: receive and transmit at the same time. The most important part is to get the receive side working.

This evening had a pass of the SO-50 amateur satellite and a pass of the Fox-1D satellite right after another (with some overlap). And it's dry and a reasonable temperature to be outside with laptop, preamp, rtl-sdr stick and arrow antenna.

Signal levels on narrow FM are still very faint and hard to hear, so I guess I am at the limits of the rtl-sdr for weaker signals, even with the preamp.

2018-05-20 I participated in the EU PSK DX Contest 2018
This weekend I had some time to participate in the EU PSK DX Contest. Conditions did not cooperate very well. First I thought local qrm was making me hear only the loudest stations but comparing it to the Utwente websdr I was hearing about 'everything'.
Total number of QSO in your log is 41, Including 0 QSO with errors, Valid QSO - 41
Band  QSOs Dupes Points Mults
160      0     0      0     0
80       0     0      0     0
40      28     0     56    39
20      13     0     25    21
15       0     0      0     0
10       0     0      0     0
======================================
Total   41     0     81    60
Claimed score is 4860 points

2018-05-14 Back to the 10 meter band
The 10 meter amateur band (from 28.0 to 29.7 MHz) is the HF band where I started making the first HF contacts in 2014 but after that HF propagation went down and I had to go to lower frequencies and bigger antennas.

But there are short periods of better propagation and this evening I tried FT8 on the 10 meter band again and made two contacts into Norway. I even received signals from Brazil so propagation was ok, mostly along the 'greyline' which is the line over the earth between the areas in the sun and not in the sun and causes some more propagation.

2018-05-07 I participated in the ARI International DX Contest
Last weekend I participated in the ARI International DX Contest.

Before the contest I was looking at the option of trying the tlf contest software and operating phone (voice) but adding the definitions for scoring this contest to tlf turned out to be not possible at the moment and at the end the weekend was filled with enough other things that only a few hours of operating RTTY were left. Propagation wasn't very cooperative and I first was blaming local interference until I noticed that the same lack of signals was showing in other places and twitter was filled with aurora pictures, so a solar flare had blocked propagation.

In the end I made 43 contacts and entered in the 'single operator RTTY low power' category. Low power on an Italian scale: below 100 watts.

2018-05-01 Getting amateur satellite contacts into LoTW correctly
A very good bit of info just flew by on the amsat-bb mailing list: Logging Satellite QSOs with Logbook of the World - AMSAT-NA.

Complete with screenshots and needed steps, how to create an ADIF file (which I could import into CQRLOG) with the satellite-specific fields set to the values needed by LoTW to make it a valid satellite-contact.

CQRLOG has no support for satellite-specific contact information, so for me the workflow for these contacts would be to create an ADIF file as above in LoTW, upload it, and import the ADIF file in CQRLOG and not upload it from CQRLOG.

Now to find time, energy and nice weather to get on the satellites again.

2018-04-26 More radio maps and their limits
The PE4KH website has maps of the locations where I contacted radio amateurs all over the world. The maps with generated images are created by exporting my locators worked/confirmed from cqrlog and using gcmwin for linux with a whole set of different configurations to plot the results.

But now the 2 meter band has been added and on that band a 'record distance' is not as far as on HF. On HF my current distance record was a contact with Australia at 16581 kilometers. My current distance record on the 2 meter band is 363 kilometer in Germany. Quite a different scale!

So the maps part has been enhanced with a 2 meter contacts map, but gcmwin can't use 6-position maidenhead locators so the map is quite coarse compared to what I want. I don't know the solution at the moment to improve this. The recent qso map PE4KH does show the more precise gridsquares when available in the log, so maybe that page needs distances added.

2018-04-24 Building my own balun, part 7: Better measurements of the result
Homemade balun version 2 SWR scan 1-60 MHz
Homemade balun version 2 SWR scan 1-60 MHz 20180424
Homemade balun version 2 SWR scan 10 meter band
Homemade balun version 2 SWR scan 10 meter band 20180424
Homemade balun version 2 SWR scan 20 meter band
Homemade balun version 2 SWR scan 20 meter band 20180424
Time to do measurements of the revised attic antenna. And now with a voltage balun with more windings the balun is working better, showing ok SWR values. A nice optimum in the middle of the 20 meter band (although I originally wanted that optimum near the digital mode part) and a nice optimum in the 10 meter band (also somewhat higher than originally planned). Comparing them to the original measurements show an increase in frequency in both SWR curves.

So I consider this a good result! Time to get it on the air and make contacts again.

Next step, working on an outside dipole with the Fritzel balun.

2018-04-23 Building my own balun, part 6: Redo and some success: a working antenna again
After the previous measurements showed the balun and dipole under the roof weren't acting as a perfect combination. So time to do a few things better: more windings, less leftover wire and a switch to a voltage balun. Yes, other sources indicate a current balun is better, but I decided otherwise. The Fritzel balun turned out to be a voltage balun after I removed it from the dipole antenna.

Balun project version 2 in case So I used the instructions at 1:1 voltage balun by VK6YSF to rebuild it as a voltage balun and I made sure the wires were shorter in the end. Getting the shorter wires in the right places in the case did get me some slightly burned fingers!

Success is currently defined as "I can transmit a carrier on the 20 meter or 10 meter band and the SWR meter of my radio only goes up a few segments" which isn't very scientific, I will need to do the rest of the measurements with the SWR meter to be sure.

2018-04-16 Building my own balun, part 5: First tests of the result
Homemade balun SWR scan 1-60 MHz
Homemade balun SWR scan 1-60 MHz 20180415
Homemade balun SWR scan 10 meter band
Homemade balun SWR scan 10 meter band 20180415
Homemade balun SWR scan 20 meter band
Homemade balun SWR scan 20 meter band 20180415
So I removed the old balun and installed the one I made. Removing the old one wasn't easy: the Fritzel balun has a cover over the SO239 connector which makes the heavy duty connector I used very hard to unscrew. So I had to break bits of that cover to get the needed access. And the connector ended with a lot more scratches from my attempts to get access to it.

But now the balun is replaced, and measured. And it looks like some things have changed now causing the antenna to be 'mistuned'.

Update: Just some measurements and thinking: adding the big common mode choke in the mix makes the combination show better SWR curves (still not what I want) but with the frequency with the best SWR still too low. This suggests (to me) two things: I need more windings on the ferrite core and less extra wire length from the core to the connectors. Time for a rebuild.

Items before 2018-04-16
This page is created by Koos van den Hout, contact information at the end of my homepage.
Other webprojects: Weatherstation Utrecht Overvecht, Weather maps, Camp Wireless, wireless Internet access at campsites The Virtual Bookcase book reviews, webcam.idefix.net
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