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Benjamin Grogg
Lives in Berne, Switzerland
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Ugly Prototyping... but it's fast and cheap. Its a part of a selective active antenna. More info will follow soon (hopefully)
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Ethan Blanton's profile photo
 
Those rings look very nice. What are you using to cut them?
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Benjamin Grogg

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Have some fun with Digital Radio Mondiale (DRM). When everything is in sync it's not too bad at all. But you need really a clean and strong signal.
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Sanjay Sutradhar's profile photo
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I use FiFi-SDR. I had always a huge spike in the middle. First I think I came from the antenna. When I disconnected the antenna the spike was still there. Then I check my grounding (Ground Loop). I even Isolate my USB Connection but nothing help. Finally it was the USB Cable.... Somehow the solution is very easy :-) 73
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IWTREERREIV GIANPAOLO's profile photo
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This is my new toy. #FiFi-SDR Version 2.0 (Which supports now 192KHz sampling rate and covers 0.1 - 30 MHz). They sale it as "kit" (Including PreSelector). Don't worry it very easy! You just have to solder the Connectors. SMD Elements are already soldered. The kit comes with driver and program. I recommend Bonito FiFi-SDR. As antenna I use a Degen 31MS Active Loop. So far I'm very happy with the results! You can order from www.box73.de (Europe) or www.box73.com (US). If you want know more about FiFi-SDR I recommend following site : http://o28.sischa.net/fifisdr/trac happy listening & 73 de HB3YIW
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David Snyder's profile photoBenjamin Grogg's profile photo
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+David Snyder If you don't want to solder check out this : http://www.funcubedongle.com/ have fun and 73!
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Had some fun with KBS DRM Transmission. Lucky me - the signal was strong enough to decode.
I use HDSDR with Dream and VB-Audio. I'm really happy with this combination. Works very well together under Windows 8.1
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I building something round. Who have a clue for what I use this item or what it can be?  Happy guessing :-)
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Carol F. Milazzo's profile photoMichael Austin's profile photoBenjamin Grogg's profile photoMirko Cingolani's profile photo
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I tied the shield ends and the center conductor ends together like this.  It reduces the resistive and inductive component of the capacitor. increasing its Q factor and better distributing the RF current over it and decreasing power loss as heat. See https://picasaweb.google.com/lh/photo/hOqIrJ_em-O9OpBoESRSBNMTjNZETYmyPJy0liipFm0?feat=directlink
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Here is a little hint how you can calculate Z (Impedance) of a cable. In my case I used a Twisted Pair Cable (a pair should be 100 Ohm). All you need is a L/C Meter and a good brain or calculator.

Do following steps :
1) Calibrate your L/C Meter L should be 0µH
2) Twist the end of the cable together and measure (See Picture 1)
3) Calibrate C should be  ∞F
4) Do not twist the cable at the end and measure (See Picture 2)
5) Calculate sqrt(L/C) in my case sqrt(3.335/224) which gives me 122 Ohm. 

73 de HB3YIW
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Is our Sun falling silent? This giant ball of plasma should be peppered with sunspots, exploding with flares and spewing out huge clouds of charged particles into space in the form of coronal mass ejections.

But apart from the odd event, like some recent solar flares, it has been very quiet. And this damp squib of a maximum follows a solar minimum - the period when the Sun's activity troughs - that was longer and lower than scientists expected.

http://buff.ly/1eNw7IM
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HB3YIW
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Amateurfunk Lizenz seit 2013 / HB3YIW
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Currently
Berne, Switzerland
Previously
Biel-Bienne, Switzerland
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IT-Specialist
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Male
Other names
Ben Grogg, Benny Grogg, Beni Grogg