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Showing posts with label Netherlands.. Show all posts
Showing posts with label Netherlands.. Show all posts

Friday, October 14, 2016

Beautifully Ugly! A Homebrew Receiver from the Netherlands (video)



This one is similar to the receiver I've been working on:  middle of the HF band, discrete components, all analog, 455 kc IF, wooden chassis, eclectic circuit boards.  Very cool.

The builder is Ko Tilman.  His YouTube channel is here:
https://www.youtube.com/channel/UCqe1Y4StR9cZ8BQDWuoMq9w

I came across Ko's channel when I was looking for a circuit for an AM detector.   I have been  experimenting with the standard one diode and two diode (Germanium) circuits, but the receiver doesn't sound very good when using these circuits.   Any recommendations for something a bit better (without getting carried away with complexity)?


About Ko Tilman:

Ko Tilman (1955) lives in the Netherlands and is active in electronics since 1967. His focus is on analog electronics, audio, shortwave radio's, small (solar) energy systems and measurement and control systems. He is the author of "Retro Radio", Isbn 978-90-5381-234-1, published by Elektor International Media in the Netherlands. In this book (Dutch text) you will find several simple schematics from Shortwave radio's (2 MHz - 16 MHz), including radio's with SSB reception. His long time knowledge about small audio systems (for household use) is available in his book "Schematics 2, audio amplifiers and loudspeaker boxes ", available on this website (a summary of the content is visible). Also in an E-book format: Isbn 978-1-4475-7336-4. In the past (2008-2010) he was active on You Tube under the name "radioam232", now he is active on Youtube as "radiofun232". A free download from the activities in the "radioam232" period is available on this website in the content "blueprints 1".

Ko's Books: http://www.lulu.com/spotlight/radioam232



Saturday, December 14, 2013

University of Twente's Online Receiver


Wow, I played with this on-line SDR receiver a few years ago and thought it was fantastic.   It is now even better.  I'm sitting here listening to 40 meters in the Netherlands.  Great stuff.   Check it out.  It is really amazing:

http://websdr.ewi.utwente.nl:8901/

Thanks to Bob, KD4EBM for letting me know about the updates. 

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Thursday, February 4, 2010

PA1ZZ Gets Ticket in Southern California


A while back we reported on the Californian travails of long-time listener Rogier, PA1ZZ.   We are happy to report that OM Rogier has joined the ranks or U.S.-licensed radio amateurs and is preparing to wiggle the ether with the FB rig pictured above. 



Hey Bill,
Since the FCC doesn’t like it if you use the foreign license as a Permanent resident. I took the plunge and passed the technician and general exams in one day.
So here I am KJ6ETL QRV from San Mateo, CA.
One day I will do the Extra class but that's for later. First I have to study for my career, hobby comes 2nd…

I still had my DSW-II build from a kit when I was living on Bonaire. But never managed to get in the air due to the lack of a dummy load to tune the final stage and a very strong HF signal from a local US religious broadcast station (50KW) aiming at South America and the Radio Netherlands relay station. Both put so much HF in the air that my SWR meter needle was pushed in the corner without my transmitter hooked up…

Now, years later, I polished the March R3A paddle and finally tuned the DSW-II. Next step will be to hang an invisible 20mtr band dipole on our balcony (hoa’s….) and see what happens.
Since my morse skills are very rusty and antenna and power are rather limited I might want to jump ahead and start with the digital modes...


Smiles across the wires,

Rogier

Saturday, October 17, 2009

When all else fails... THE KNACK

Kurt, N3JTW, alerted me to an excellent article on the blog site of the Dutch magazine Elektor. It is about a major flood in the Netherlands in 1953. Cut off from the mainland and without communication gear, OM Hossfeld whipped up the transmitter pictured above and set up a vitally important communications link. He used an 807 tube in the final. 10 Watts out on 15 meters. Note the coil wound on the bottle. The call was PA0ZRK. FB!
Here's the link: http://theelectronicball.blogspot.com/2009/10/radio-to-rescue.html
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