DL4YHF's homepage

Main Site : www.qsl.net/dl4yhf
Backup : www.mydarc.de/dl4yhf

(the website at freenet.de has disappeared since they became non-free)

Who is "DL4YHF" ?

DL4YHF is my amateur radio callsign. If you are one of the 0.1% visitors who got here without knowing about this hobby, follow one of these links:

www.ARRL.org (American) or www.DARC.de (German amateur radio club)

The person behind the callsign DL4YHF is Wolfgang Büscher (that's me), living in a small village called Mantershagen which you will hardly find on a large-area map. Where it is ? It's a part of Barduettingdorf (gosh, that sounds nice in morse code), and if you still can't find that on a map: It belongs to the town of Spenge, though many people here say it's the Kingdom of Mantershagen (das Königreich Mantershagen). More seriously, it's a bit north of Bielefeld in Nordrhein-Westfalen, for VHF/UHF experts: the locator square is JO42FD.

I was interested in electronics long before becoming a radio amateur, I actually found the time to prepare for the first radio license examination at the same time when studying Electronics to become an engineer. At the present time (2003) I am working as hard- and software developer (more as software developer for embedded systems these days). But back to my hobbies which are more interesting than the job..

Radio Amateurs around the world often exchange "QSL-cards" with fellow radio amateurs (sometimes called "hams", but I don't like the story behind the original meaning of "ham"..). Well anyway, "QSL" is an abbreviation which originally meaned "message received" in a conversation in morse code, the conversation (sometimes just a contact) being called "QSO" and so on.

So here is one of my old QSL-cards - just in case I have forgotten to send one to you "via club":

I am active on longwave, shortwave and VHF , preferably on the WARC-bands in CW and SSB. Most activity takes place at the club-station DF0WD. There is also a photo of myself amongst the crew members.


A completely different hobby is growing carnivorous plants - here just a small picture, maybe there will be more on my website if time  and space permit. By the way this was the first time my helioamphora was beginning(!) to flower - thanks Mat for the donation - in contrast to my other carnivors like drosera, dionea, sarracenia. Actually the flower grew much larger, and lasted for the whole spring.

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mail to:

Before sending an email to me, please check the various forums if the question hasn't been asked (and answered) before. And, when sending mail, avoid stupid topic lines like "Hi", "Hello", "Question", or even "" (empty topic) because such a message will never make it beyond the spam filter. Also, mention one of the subjects which you find on this website (like "Accuracy of the PIC frequency counter", "Problem with Spectrum Lab under Windows Vista", "Problem with WinPic under Windows Vista", "Suggestion for the QRP Morse keyer", etc), so I can quickly see that your message is no spam. I receive about 50 spams per day ... you want some ?  ;-)

Email trouble (2008-03-16)

If you don't get a response from me after sending an email, don't take it too serious.

It is not your fault, it is not my fault.. it's due to those criminal spammers out there !

Very likely that I have tried to reply to you, just to get a crappy response from your email provider like the one quoted below. Can you imagine how annoying it is to spend half an hour writing an email (in response to your message), just to get a reponse like the following when trying to send it ?

Here is a typical response (email of the sender replaced, of course), which has bounced thanks to some PARANOID SPAM-FILTER :

SMTP error from remote mail server after MAIL FROM: SIZE=2072: host mx1.hotmail.com []:
550 SC-001 Mail rejected by Windows Live Hotmail
for policy reasons.
Reasons for rejection may be related to content with spam-like characteristics or IP/domain reputation problems.  (what???)
If you are not an email/network admin please contact
your E-mail/Internet Service Provider for help.
Email/network admins, please visit http://postmaster.live.com
for email delivery information and support ..

(WTF ? ? My recent internet provider is one of the bad guys with a "domain reputation problem" ? Many thanks for that; free..., hot..., goo... - ....mail & Co ... ).

Here is another "nice" feedback from someone's paranoid email server:

SMTP error from remote mail server after RCPT TO:<j**.s******@webhouse.cz>:
host mx.webhouse.cz []: 550 5.7.0 Your server IP address is in the SORBS DNSBL database, bye

Ufff. This server just says "bye", this is a permanent error, arrivederci to the sender ?!

Below is a list of email addresses (with some characters removed to defeat spambots), along with a very short form of the message I was trying to send. With some imagination, the fellows concerned will know...

  • drawfeature@coldmail.com ( the winpic sources are available on my website, but it will be an enormous effort for you to port them from Borland C++ to Microstuff C# )
  • jaypeeemm@offline.fr ( thanks for the info, all ok now )