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PD4KH Amateur radio - Koos van den Hout

I passed my radio amateur exam in March 2013 and I registered the callsign PD4KH (pappa delta four kilo hotel!).
PD4KH on
PD4KH on

I am usually located around maidenhead locator: JO22NC

QSL policy for PD4KH

I upload logs to during and after being active on the radio. I upload logs to ARRL Logbook of the World, and hrdlog on a regular basis. I like paper cards via the QSL bureau so I send those out and I will respond when I receive those. 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.


Amateur Satellites
D-Star digitale amateur radio (Nederlands)


Mapped digimode contacts by PD4KH from JO22NC
Mapped satellites contacts by PD4KH from JO22NC

The 'hamradio' items from my homepage

2016-02-13 Vectored VDSL and the influence of amateur radio transmissions
Another radio amateur found my earlier experiences with transmitting on 20 and 40 meters and the influence on vectored VDSL, Amateur radio transmitting influence on vectored VDSL and And now vectored VDSL doesn't mind transmitting.

He also has the problem of keying up on 20 or 40 meters and having VDSL drop completely. He shared his signal/noise graphs with me and I noticed a similarity with my first signal/noise graph: an area somewhere else in the frequency space used by VDSL which has had serious changes in signal/noise levels.

I switched the modem to a DrayTek Vigor 130 (for reasons having to do with my setup at home) and the first tests with PSK31 and JT65 on 20 meter show no problems with the VDSL modem. But the varying interference above 16 MHz hasn't returned, so maybe when this interference returns the DrayTek Vigor will disconnect too.

2016-02-13 Solar power for outdoor amateur radio
I came across this article: DIY: The Off Grid Ham 100 Watts For $300 Solar Energy Plant - which has plans for a solar power setup for 300 US dollar which can indeed power a 100 Watt amateur radio transmitter (on a reasonable duty cycle, not constant transmission).

I do wonder what the parts would cost and where to order them for European radio amateurs. I will probably be interested in some setup like this when life permits me to go outdoor for operating radio for a day.

Found via I am frequently approached by frustrated radio amateurs who are looking to get into solar power and feel completely lost in all the options - Jeff Davis KE9V on Google+.

2016-02-10 And now vectored VDSL doesn't mind transmitting

Vectored VDSL spectrum as reported by the Fritz!Box 7360. The earlier interference seen starting around 16.5 MHz isn't visible.
After a restart of the modem the interference starting around 16.5 MHz hasn't returned. The interesting fact is that now transmitting on 14.070 MHz PSK31 does show in the signal/noise graph of the modem but there was no connection hickup the first time I did that, the bits/carrier just adjusted down and things went on fine.

2016-02-07 Some interesting recent 'firsts' in amateur radio recently
I had a day with for me special contacts recently. First with UT1FG/MM, Yuri who is a captain on a freight ship and crosses the ocean with some spare time to make amateur satellite and HF contacts. I had a contact with him while his ship was nearing Gibraltar from the Atlantic Ocean, which is my first 'sea' gridsquare. I hope to contact him again via satellite or HF!

Second with 7X3WPL, Sahara DX Amateur Radio Club. I have seen them a lot, tried to answer them every time (I was trying to reach them when I made a contact with Indonesia) and this time it worked.

And a contact on 20 meter PSK31 at 22:57 localtime with IK0OEF Claudio in Italy, way past sundown. I am used to propagation on 20 meter dropping when the sun sets so this was quite remarkable.

And a few days later a contact with 9H1KR on the island of Malta, also a new country for me.

2016-01-30 Amateur radio transmitting influence on vectored VDSL
Our VDSL Internet connection was recently upgraded to vectored VDSL which gives us a lot more speed: attainable speeds are now 117057 kilobit down and 42201 kilobit up. The subscription speeds are much lower, but still very nice for a home Internet connection.

The downside is that VDSL uses a lot of spectrum from nearly 0 Hz up to 17664 kHz which includes several amateur bands and vectored VDSL seems to be highly sensitive to other RF signals. For me at least 20 meter (14 MHz) and 40 meter (7 MHz). I already caused several disconnects by transmitting in these bands and even with more recent firmware this problem remains.

I have been active on the same bands since we got faster speeds without vectoring (in the beginning of November 2015) but it did not influence the VDSL stability when vectoring wasn't enabled. The VDSL profile hasn't changed (17a) so the same frequencies are used.
vectored vdsl spectrum
Vectored VDSL spectrum as reported by the FRITZ!Box 7360. The hole in bits per carrier around 14 MHz is caused by my PSK31 transmitting (I can see the influence on the signal/noise ratio while transmitting). The hole above 16.5 MHz (starting near carrier 3840) is caused by some other source of interference.

2016-01-28 VDSL instabiliteit uren later
En circa 6 uur na het inschakelen van Vectored VDSL is de hele VDSL instabiel en duurt het regelmatig lang voor data overkomt. Regelmatig valt de hele ppp sessie weg en het is al gebeurd dat de ppp sessie opkwam zonder IPv4 maar met IPv6 (gelukkig kon ik toen via IPv6 inloggen en een herstart forceren om weer IPv4 te krijgen).

De ultieme hik kwam toen ik ging zenden op 14.070 MHz (20meter PSK31 frequentie) wat binnen het VDSL2 spectrum valt. Toen verbrak de verbinding compleet en werd opnieuw de snelheid onderhandeld, waardoor er toch waardes anders werden. Maar de instabiliteit was er al voor deze actie.
 		Receive Direction 	Send Direction
Max. DSLAM throughput	kbit/s	111216	33032
Min. DSLAM throughput	kbit/s	784	232
Attainable data rate	kbit/s	76636	43379
Current throughput	kbit/s	76023	32056
Seamless rate adaptation		off	off
Latency		4 ms	8 ms
Impulse Noise Protection		72	2
G.inp		on	off
Signal-to-noise ratio	dB	6	5
Bitswap		on	off
Line attenuation	dB	9	3
Profile	17a		
G.Vector		on	on
Carrier record		A43	A43

Het lijkt er op dat ik nieuwere firmware op het modem moet installeren om de stabiliteit met vectored VDSL weer te verbeteren. Maar nieuwere firmware geeft weer meer moeite om mijn pppoe hacks mogelijk te maken.

2016-01-16 Hidden in the contest: a new distance record
eQSL card from contact with YB1AR Adding the extra data for the contacts I made in the recent UBA PSK63 Prefix Contest 2016 I noticed I had a new distance record: the contact with YB1AR was over a distance of 11468 kilometers. In the heat of the contest I didn't even notice it was Indonesia, let alone such a distance.

2016-01-14 Searching for radio interference
One of the reasons for shutting down the homeserver was that I have a constant heavy noise on several amateur radio bands, at least on 10/20/40 meters. The noise is always at level S7/S8. I wanted to eliminate the server / UPS / network switch as possible source of the noise.

Rebooting the server also helped reset the video mode back to 80x50 so the earlier problem with interference caused by the video mode is now gone, even with the video cable plugged in. But there is still a lot of other noise left.

2016-01-12 I participated UBA PSK63 Prefix Contest 2016
So I recovered the complete logs for the UBA PSK63 Prefix Contest 2016 and generated a cabrillo export for entering in the contest.

The planning and preparing for this contest helped, macro's worked as planned. The negative side was that the ionospheric propagation dropped sharply after sunset which closed the 20 meter band. I switched to the 40 meter band but almost all activity was below 7.050 MHz, where I am not allowed to transmit. After sunrise and a good breakfast on Sunday morning I worked some more on the score and improved things.

The results: 94 contacts (QSO's) in total, 87 on the 20 meter band and 7 on the 40 meter band. I decided to enter in the single operator 20 meter category since I expect my score to end relatively higher in that category compared to the single operator all band category. Claimed score: 87 qso's * 67 unique prefixes = 5829 points. Looking at the previous years scores that would put me at the 15th spot for single operator 20 meter.

My soapbox comments:
SOAPBOX: Entered as SO20 because almost all 40M activity was outside my
SOAPBOX: allowed band segment (Dutch novice starts at 7.050 MHz)
SOAPBOX: Propagation dropped fast after sunset
SOAPBOX: Something hickupped in my outgoing serial counter

Update: The UBA PSK63 Prefix Contest 2016 logs received overview has me listed with claimed score 6956 which means they included my 7 contacts on the 40 meter band in the calculation. I hope they correct this in the real score calculation.

2016-01-10 UBA PSK63 prefix contest 2016 results will wait a bit...
It seems there is some internal corruption in the fldigi program I use for amateur radio digital mode connections. Normally this shows as some strange artefacts on the screen, which means it is time to stop and start fldigi, and reset the outgoing serial number to the right number when I am busy in a contest. The more active use during a contest also seems to be a trigger.

Anyway, this internal corruption hit me hard today: right in the last minutes of the UBA PSK63 prefix contest 2016 the program hung during logging an entry, leaving me with a 0 byte logfile on disk, so all records of digimode contacts gone.

I can recover everything and still submit my results: restore the logbook.adif file from tape, add entries created after the last backup from cqrlog and add the serial numbers again to the fldigi contacts log from the fldigi text log since cqrlog copies the logentries from fldigi but without the 'contest' information. But that processing will have to wait a bit as other things take priority. The log has to be submitted before januari 17, 23:59 UTC.

Restoring the file from tape was extra interesting since I just got an error message
amrecover - can't talk to tape server: service amidxtaped: 
from amrecover. This turns out to be a known bug in amanda 3.3.0 in ubuntu 12.04 LTS: Bug #1074574 “known issue: amrecover - can't talk to tape server...” : Bugs : amanda package : Ubuntu and Bug #1077105 “amrecover - can't talk to tape server: service ami...” : Bugs : amanda package : Ubuntu. I applied the changes noted in the bugreports and after that I could restore the file.

Update: The rest of the restore operation was a matter of importing the right records back from cqrlog into fldigi and adding the serial numbers from the fldigi text log. This was just a lot of searching and typing.

Items before 2016-01-10
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,
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