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N8DMP - Ham Radio Blog: October 2014

http://n8mdp.blogspot.com/2014_10_01_archive.html

N8DMP - Ham Radio Blog. A blog about Amateur Radio, Software-Defined Radio, and related computing. John Tucker N8MDP in Cleveland, Ohio, EN91jj. Friday, October 3, 2014. In addition to my review of the ODROID-U3 Single Board Computer, I am also reviewing the new pcDuino3 single board computer. This is another cool SBC that has the potential to run my Softrock Ensemble II SDR as well with the ghpsdr3-alex software. Subscribe to: Posts (Atom). View my complete profile. Other SDR and Ham Blogs. KX3 Remote C...

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N8DMP - Ham Radio Blog

http://n8mdp.blogspot.com/2014/06/inching-closer-to-triple-play-award.html

N8DMP - Ham Radio Blog. A blog about Amateur Radio, Software-Defined Radio, and related computing. John Tucker N8MDP in Cleveland, Ohio, EN91jj. Friday, June 20, 2014. Inching closer to the Triple Play Award. According to LoTW, I have 136 confirms, 50 on Phone, 50 on Digital, and 36 on CW. Subscribe to: Post Comments (Atom). Ive been a ham radio operator since 1988 with varied interests in ham radio. I really enjoy working DX, contesting, softeware defined radios, and computer programming.

qrp-gaijin.blogspot.com

qrp-gaijin: Building a 7 MHz small transmitting loop antenna, part 2

http://qrp-gaijin.blogspot.com/2015/01/building-7-mhz-small-transmitting-loop.html

Building a 7 MHz small transmitting loop antenna, part 2. I did some more exploratory work on the mechanics of constructing my 7 MHz small transmitting loop. Fitting copper pipes together. The copper pipes I am using are 6mm in diameter with a wall thickness of 0.5 mm. This means that the inner diameter should be 5mm. Therefore, I needed to swage open the ends of the 6mm copper pipe, creating a flared opening at the pipe end, so that the 5mm pipe could fit inside. Then, the pipes will be soldered together.

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qrp-gaijin: Building a 7 MHz small transmitting loop antenna, part 3

http://qrp-gaijin.blogspot.com/2015/01/building-7-mhz-small-transmitting-loop_10.html

Building a 7 MHz small transmitting loop antenna, part 3. Part 3 of this article series focuses on the mechanics of the motorised variable capacitor. Mounting the capacitor and motor. And, this link describes in detail various loss mechanisms of air variable capacitors, including dielectric losses: http:/ g3rbj.co.uk/wp-content/uploads/2013/10/Measurements of Loss in Variable Capacitors issue 2.pdf. The capacitor is mounted on the polyethylene board as follows. The motor looks as follows. The current mot...

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qrp-gaijin: 4月 2014

http://qrp-gaijin.blogspot.com/2014_04_01_archive.html

A simulated 40m multi-turn small transmitting loop. To open the model in 4nec2, copy and paste the text between the dashed lines and save it to a file, then open the file in 4nec2. CM 3D multi-turn loop. CM qrp.gaijin@yahoo.com (2014/04). The simulation results are as shown in the following image. It follows that by adjusting the turn spacing or diameter, the structure can be made self-resonant with no need for an additional resonating capacitor. Roger G3XBM's Amateur Radio Blog. 10m JT65 since breakfast.

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qrp-gaijin: Fringe howling regenerative receiver

http://qrp-gaijin.blogspot.com/2014/10/fringe-howling-regenerative-receiver.html

Fringe howling regenerative receiver. Schematic diagram of fringe-howling regenerative receiver. The following video illustrates the fringe howl occurring in the receiver prototype. Although the audio and video quality are low, and the prototype circuit layout is not visually pleasing, I felt it important to create an audio-visual recording of the fringe howl phenomenon, because there is (as far as I know) no existing audio-visual documentation of the phenomenon, only written descriptions. Video from 02:...

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N8DMP - Ham Radio Blog

http://n8mdp.blogspot.com/2014/09/wow-its-been-some-time-since-i-have-had.html

N8DMP - Ham Radio Blog. A blog about Amateur Radio, Software-Defined Radio, and related computing. John Tucker N8MDP in Cleveland, Ohio, EN91jj. Sunday, September 7, 2014. Wow, it's been some time since I have had a blog entry. Not much to really discuss these days. Lastly, I continue to make great progress with the ARRL Centennial QSO Party, Here are my latest results:. Only 3 CW state confirmations away from overall Triple Play Award! DE, NC, WV). Closing in on W1AW/x Triple Play Award! Ham Radio Blog ...

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N8DMP - Ham Radio Blog: July 2014

http://n8mdp.blogspot.com/2014_07_01_archive.html

N8DMP - Ham Radio Blog. A blog about Amateur Radio, Software-Defined Radio, and related computing. John Tucker N8MDP in Cleveland, Ohio, EN91jj. Sunday, July 6, 2014. My good friend Alan Wolke, W2AEW, who also works for Tektronix posted this real cool video on the technical details of the Softrock Ensemble II SDR board. This is a video worth watching. Subscribe to: Posts (Atom). View my complete profile. My good friend Alan Wolke, W2AEW, who also works f. Other SDR and Ham Blogs. Ham Radio Blog by AG1LE.

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qrp-gaijin: 6月 2014

http://qrp-gaijin.blogspot.com/2014_06_01_archive.html

Qrp-gaijin small transmitting loop calculator. Loop side length m. Loop area m 2. Conductor cross sectional shape. Equivalent round conductor diameter for RF resistance. Equivalent conductor diameter for loop inductance. Loop conductor inductance uH. Loop conductor bulk resistivity Wm. Loop conductor loss multiplier (braid:4-16). Length of capacitor connecting wires mm. Connecting wire cross sectional shape. Connecting wire diameter mm. Connecing wire width mm. Connecting wire thickness mm. This calculat...