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mission:log:2012:08:02:active-wideband-receiver-antenna-for-sdr [2015/08/18 08:17] – [Alternative LNA Proposals] chronomission:log:2012:08:02:active-wideband-receiver-antenna-for-sdr [2017/01/04 23:32] (current) – [Antenna Element] chrono
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 ==== Antenna Element ==== ==== Antenna Element ====
  
-The antenna element itself is a simple quadrilateral monopole, in the shape of a wedge, with a narrow start and a wider end. For lack of a common nomenclature and a relatively close optical proximity to a log-per design, this type is going to be ignorantly called //log-per-spiral//. The monopole is "glued" onto a self-adhesive, semirigid, matte-white material and then rolled to a cylinder with 80mm diameter, thus forming a spiral. Unfortunately, there seems virtually no accessible background data available about the RF properties of this particular antenna design. A NEC simulation would be interesting.+The antenna element itself is a simple quadrilateral monopole, in the shape of a wedge, with a narrow start and a wider end. For lack of a common nomenclature and a relatively close optical proximity to a log-per design, this type is going to be ignorantly called //log-per-spiral//. The monopole is "glued" onto a self-adhesive, semirigid, matte-white material and then rolled to a cylinder with 80mm diameter, thus forming a spiral. Unfortunately, there seems virtually no accessible background data available about the RF properties of this particular antenna design. 
  
-[{{:lab:awra-antenna-element1.png?186|Copp +[{{:lab:awra-antenna-element1.png?186|Copper Antenna Element}}]
-er Antenna Element}}]+
 [{{:lab:awra-antenna-element-with-pvc-foil.png?186|Antenna Element placed}}] [{{:lab:awra-antenna-element-with-pvc-foil.png?186|Antenna Element placed}}]
 [{{:lab:active-wideband-receiver-antenna-original-unrolled.jpg?188|Original unrolled}}] [{{:lab:active-wideband-receiver-antenna-original-unrolled.jpg?188|Original unrolled}}]
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 ~~CL~~ ~~CL~~
 \\ \\
-The small start of the original copper log-per-spiral begins at a 25mm offset from the bottom part of the white, rolled 80mm cylinder, the wider end extends 75mm over the upper edge. After 55mm from the edge of the white cylinder, the rest of the copper is bent around the outer tube and then covered by the cap. This has probably no effect on RF properties (can someone verify this?) but is probably a way to give the whole structure more mechanical support.+The small start of the original copper log-per-spiral begins at a 25mm offset from the bottom part of the white, rolled 80mm cylinder, the wider end extends 75mm over the upper edge. After 55mm from the edge of the white cylinder, the rest of the copper is bent around the outer tube and then covered by the cap. This has probably no effect on RF properties (can someone verify this?) but is probably a way to give the whole structure more mechanical support.  
 + 
 +For easier replication, use one of the following cutting helper templates:
  
 <WRAP round download> <WRAP round download>
 **Downloads:**\\ **Downloads:**\\
-[[https://apollo.open-resource.org/downloads/active-wideband-receiver-antenna-cutting-helper-V1.0.svg|Copper Element Cutting helper (1:1)]]\\+{{:mission:log:2012:08:02:dressler-ara-2000-wide-band-antenna-split.pdf|Split-Print DIN A4 Copper-Element  Cutting Helper by Dave (recommended)}}\\ 
 +[[https://apollo.open-resource.org/downloads/active-wideband-receiver-antenna-cutting-helper-V1.0.svg|Original Copper-Element Cutting helper draft(1:1)]]\\
 </WRAP> </WRAP>
 === Properties === === Properties ===
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 [[http://www.ebay.de/itm/Kupferfolie-Kupferblech-3-00-m-SE-Cu-0-20-mm-x-148-mm-/270713937759?pt=Modellbauwerkzeuge&hash=item3f07cedf5f#ht_4247wt_1414|1]], [[http://www.ebay.de/itm/Kupferfolie-Kupferblech-3-00-m-SE-Cu-0-20-mm-x-148-mm-/270713937759?pt=Modellbauwerkzeuge&hash=item3f07cedf5f#ht_4247wt_1414|1]],
-[[http://www.modulor.de/shop/oxid.php/sid/c5b9a86a17a8d23d1c6e87f76c77c9fc/cl/details/cnid/EAB/anid/127151S|2]][[http://www.ebay.de/itm/Kupferfolie-Kupferblech-1-00-m-SE-Cu-0-20-mm-x-200-mm-/271170987669?pt=Modellbauwerkzeuge&hash=item3f230ce695|3 (Thanks to christian)]]+[[http://www.modulor.de/shop/oxid.php/sid/c5b9a86a17a8d23d1c6e87f76c77c9fc/cl/details/cnid/EAB/anid/127151S|2]], [[http://www.ebay.de/itm/Kupferfolie-Kupferblech-1-00-m-SE-Cu-0-20-mm-x-200-mm-/271170987669?pt=Modellbauwerkzeuge&hash=item3f230ce695|3 (Thanks to christian)]]
  
 ==== Structure Tube ==== ==== Structure Tube ====
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 [[http://www.gpe-shop.de/index.php/kappen/kappen-fur-rundrohre/kappen-fur-rundrohre/k-serie/pvc-kappen-fur-rr-weiss/k-90-w.html|Caps]] [[http://www.gpe-shop.de/index.php/kappen/kappen-fur-rundrohre/kappen-fur-rundrohre/k-serie/pvc-kappen-fur-rr-weiss/k-90-w.html|Caps]]
  
 +==== NEC2 Simulation ====
 +
 +First NEC2 Simulation efforts by Samuel Burri: 
 +
 +{{:mission:log:2012:08:02:ara_2000_xnec2c.png|XNEC2 ARA-2000 Simulation}}
 +
 +https://www.samuelburri.ch/2016/06/10/ara-2000-antenna-model/
 ===== LNA ===== ===== LNA =====
  
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 [{{:mission:log:2012:08:02:pinout_dirt.jpg?400|Dirt and confusing markings}}] [{{:mission:log:2012:08:02:pinout_dirt.jpg?400|Dirt and confusing markings}}]
  
-This is a close-up of the inside PCB and the used MMIC. Confusingly the pin-numbering of the MMIC is obviously wrog and I'm not sure if that is a mistake / stupidity or a distraction to "complicate" reverse engeneering. The marking on the top of the IC says "E3", which fits perfectly to the [[http://www.mouser.com/ds/2/302/BGA2709-107790.pdf|BGA2709]]. I found this [[www.mikrocontroller.net/attachment/98618/Marking_Codes_V06_OE5VLL.xls|list]] with case markings of about 22k parts.+This is a close-up of the inside PCB and the used MMIC. Confusingly the pin-numbering of the MMIC is obviously wrong and I'm not sure if that is a mistake / stupidity or a distraction to "complicate" reverse engeneering. The marking on the top of the IC says "E3", which fits perfectly to the [[http://www.mouser.com/ds/2/302/BGA2709-107790.pdf|BGA2709]]. I found this [[www.mikrocontroller.net/attachment/98618/Marking_Codes_V06_OE5VLL.xls|list]] with case markings of about 22k parts.
  
 [{{:mission:log:2012:08:02:schematic.png?295|Schematic of the PCB}}] [{{:mission:log:2012:08:02:schematic.png?295|Schematic of the PCB}}]
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 [[mission:log:2012:05:06:rtlsdr-osmosdr-gnuradio-fm-receiver]]\\ [[mission:log:2012:05:06:rtlsdr-osmosdr-gnuradio-fm-receiver]]\\
 [[mission:log:2014:08:08:darc-side-of-munich-hunting-fm-broadcasts-for-bus-and-tram-display-information-on-90-mhz]]\\ [[mission:log:2014:08:08:darc-side-of-munich-hunting-fm-broadcasts-for-bus-and-tram-display-information-on-90-mhz]]\\
-[[mission:log:2014:11:05:hacking-rf-controlled-power-switches-with-hackrf-and-gnuradio]]+[[mission:log:2014:11:05:hacking-rf-controlled-power-switches-with-hackrf-and-gnuradio]]\\ 
 +[[mission:log:2015:08:18:another-active-wideband-receiver-antenna-ara-2000-with-lna-rebuild]]
 </WRAP> </WRAP>
  
Trace:

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