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Building a 7 MHz small transmitting loop antenna, part 5. Part 5 of this series describes some mechanical design changes and first disappointing tests with the loop. First design change: From copper pipe to copper strap. As described in parts 1 and 2 of this series, the original design for the 3m x 2m loop radiator was to construct it using several 1m-length segments of 6mm-diameter thin-wall copper pipe. However, such a structure, once built, is impossible to move or alter without tedious disassembly.

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Building a 7 MHz small transmitting loop antenna, part 5. Part 5 of this series describes some mechanical design changes and first disappointing tests with the loop. First design change: From copper pipe to copper strap. As described in parts 1 and 2 of this series, the original design for the 3m x 2m loop radiator was to construct it using several 1m-length segments of 6mm-diameter thin-wall copper pipe. However, such a structure, once built, is impossible to move or alter without tedious disassembly.

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qrp-gaijin | qrp-gaijin.blogspot.com Reviews

https://qrp-gaijin.blogspot.com

Building a 7 MHz small transmitting loop antenna, part 5. Part 5 of this series describes some mechanical design changes and first disappointing tests with the loop. First design change: From copper pipe to copper strap. As described in parts 1 and 2 of this series, the original design for the 3m x 2m loop radiator was to construct it using several 1m-length segments of 6mm-diameter thin-wall copper pipe. However, such a structure, once built, is impossible to move or alter without tedious disassembly.

INTERNAL PAGES

qrp-gaijin.blogspot.com

1

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

http://www.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...

2

qrp-gaijin: 4月 2014

http://www.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.

3

qrp-gaijin: Fringe howling regenerative receiver

http://www.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:...

4

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

http://www.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.

5

qrp-gaijin: 8月 2014

http://www.qrp-gaijin.blogspot.com/2014_08_01_archive.html

Simulation of regenerative receivers. At the Yahoo Group called regenrx. Thus I created a new Yahoo Group called regenrx-simulations. There are already a few working examples posted showing AM detection and CW detection, including regenerative amplification and AF detection. Other examples include frequency determination via FFT and AC sweeps, determining the threshold regeneration level with parameter sweeps, and frequency shift with regeneration adjustment. Feel free to stop by and have a look!

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vk3il.net

Portable magnetic loop antenna | VK3IL Blog

http://www.vk3il.net/projects/portable-magnetic-loop-antenna

My SOTA adventures and project notebook. Skip to primary content. Trapped five band EFHW SOTA antenna. MTR 2 firmware new features. Touch Paddle for MTR 2. MTR 2 gain mod. Portable magnetic loop antenna. VK SOTA CW practice files. Portable magnetic loop antenna. My magnetic loop inspired by DG2IAQ’s design. I wasn’t totally convinced on the small loop matching approach used in the AlexLoop for SOTA applications, so explored further and came across the design by DG2IAQ using capacitive matching. The key t...

circuitsalad.com

An unusual Regenerative receiver circuit using only bipolar transistors | Circuit Salad

https://circuitsalad.com/2014/12/06/another-excellent-performing-regen-circuit-coming-shortly

Electronics from Conception to Completion. An unusual Regenerative receiver circuit using only bipolar transistors. An unusual Regenerative receiver circuit using only bipolar transistors. December 6, 2014. July 1, 2015. This design uses junk box 2N2222A or 2n3904 transistors. Its easy to build and offers excellent performance. Here is a preliminary schematic. It works well but I am still tweaking it. Look for revisions to follow. A few quick notes:. In the schematic, I show the detector connected to L1 ...

circuitsalad.com

Yet another Variant of the Junk Box Regen – this one is really weird but is an excellent performer | Circuit Salad

https://circuitsalad.com/2015/01/27/yet-another-variant-of-the-junk-box-regen-this-one-is-really-weird-but-is-an-excellent-performer

Electronics from Conception to Completion. Yet another Variant of the Junk Box Regen – this one is really weird but is an excellent performer. Yet another Variant of the Junk Box Regen – this one is really weird but is an excellent performer. January 27, 2015. July 1, 2015. Again I got it to work with a wide range of values, so it should be easy to reproduce. I hope someone builds this and gives me their opinion on performance. Variation on Junk Box Bipolar Regenerative Receiver. I must admit to being ra...

circuitsalad.com

Variation on Junk Box Bipolar Regenerative Receiver | Circuit Salad

https://circuitsalad.com/2015/01/22/variation-on-junk-box-bipolar-regenerative-receiver

Electronics from Conception to Completion. Variation on Junk Box Bipolar Regenerative Receiver. Variation on Junk Box Bipolar Regenerative Receiver. January 22, 2015. July 1, 2015. Schematic Diagram(modified TDA7052at circuit 07/01/2015). An unusual Regenerative receiver circuit using only bipolar transistors. Yet another Variant of the Junk Box Regen – this one is really weird but is an excellent performer →. 10 thoughts on “ Variation on Junk Box Bipolar Regenerative Receiver. I’d like to build t...

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qrp-gaijin.blogspot.com

qrp-gaijin

Building a 7 MHz small transmitting loop antenna, part 5. Part 5 of this series describes some mechanical design changes and first disappointing tests with the loop. First design change: From copper pipe to copper strap. As described in parts 1 and 2 of this series, the original design for the 3m x 2m loop radiator was to construct it using several 1m-length segments of 6mm-diameter thin-wall copper pipe. However, such a structure, once built, is impossible to move or alter without tedious disassembly.

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QDR - Quick Release Pins & Accessories

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จำหน่าย ชุดคิต วิทยุรับส่ง กำลังส่งต่ำ QRP. สนใจโทรสอบถาม E27EK ธนวัฒน์ 081-5756425 ตู้ปณ. 44 ปณจ.ชลบุรี 20000. การสั่งซื้อ. การสั่งซื้อ. ผลงานของเพื่อนสมาชิก. การฝึกรหัสมอร์ส. แนวคิดในการจัดทำชุดคิต. สร้างเครื่องรับ 21 MHz. วันอาทิตย์ที่ 3 พฤศจิกายน พ.ศ. 2556. Variable Capacitor มาใหม่. Pin 1 = 3-13 pF. Pin 2 = 8-125pF. Pin 3 = 9-44 pF. Pin 4 = 7-10p. ส่งอีเมลข้อมูลนี้. แชร์ไปที่ Twitter. แชร์ไปที่ Facebook. วันศุกร์ที่ 14 มิถุนายน พ.ศ. 2556. Http:/ hs8jyx.com/html/radio-kits.html. 5 LED 1 ตัว. ต้...

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