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mission:log:2012:08:02:active-wideband-receiver-antenna-for-sdr [2014/09/02 20:11] – [Antenna Element] chronomission:log:2012:08:02:active-wideband-receiver-antenna-for-sdr [2016/08/12 12:50] – Added NEC2 Simulation chrono
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-====== Active Wideband Receiver Antenna for SDR ======+====== Active Wideband Receiver Antenna for your SDR ======
  
 [{{ :lab:active-wideband-receiver-antenna-original-ara-2000.jpg?210|Dressler ARA-2000}}] [{{ :lab:active-wideband-receiver-antenna-original-ara-2000.jpg?210|Dressler ARA-2000}}]
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 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. A NEC simulation would be interesting.
  
-[{{: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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 [[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 ====
  
-Further analysis and research regarding material and availability lead to the speculative conclusion, that this foil probably is [[http://www.aslan-schwarz.com/product_info.php?language=en&info=p403_ASLAN-S-22-et-ASLAN-SP-22.html|Aslan S22]] PVC lamp shade film. The non-adhesive side of the material could be very much described as a satin surface and it's clearly not paper. +Further analysis and research regarding material and availability lead to the speculative conclusion, that this foil probably is [[http://www.aslan-schwarz.com/Lampenschirme/Selbstklebende-Hart-PVC-Folien/Mit-Kunststoffabdeckung/ASLAN-S-22-0-30-mm--380.html?cl=292|Aslan S22]] PVC lamp shade film. The non-adhesive side of the material could be very much described as a satin surface and it's clearly not paper. 
  
 [{{:lab:active-wideband-receiver-antenna-original-stucture1.jpg?187|}}] [{{:lab:active-wideband-receiver-antenna-original-stucture1.jpg?187|}}]
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 === Properties === === Properties ===
  
-| Material | [[http://www.aslan-schwarz.com/product_info.php?language=en&info=p403_ASLAN-S-22-et-ASLAN-SP-22.html|Aslan S22]] PVC lamp shade film (high probability) |+| Material | [[http://www.aslan-schwarz.com/Lampenschirme/Selbstklebende-Hart-PVC-Folien/Mit-Kunststoffabdeckung/ASLAN-S-22-0-30-mm--380.html?cl=292|Aslan S22]] PVC lamp shade film (high probability) |
 | Length | 405mm | | Length | 405mm |
 | Width | 405mm | | Width | 405mm |
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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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 ~~CL~~ ~~CL~~
 ==== Alternative LNA Proposals ==== ==== Alternative LNA Proposals ====
 +
 +=== BFP420 ===
  
 Due to the venerable age of the original LNA, it is very likely, that more recent semiconductors can deliver superior performance compared to the old design. The LNA is going to be replaced by a new LNA based on Infineons BFP420 which is cheap and available and should perform equally or better. The following two schematics show typical LNA configurations for the BFP420, the left one is the most simple approach (to be tested first), the right picture shows a more refined approach, with better base/collector voltage stabilization.  Due to the venerable age of the original LNA, it is very likely, that more recent semiconductors can deliver superior performance compared to the old design. The LNA is going to be replaced by a new LNA based on Infineons BFP420 which is cheap and available and should perform equally or better. The following two schematics show typical LNA configurations for the BFP420, the left one is the most simple approach (to be tested first), the right picture shows a more refined approach, with better base/collector voltage stabilization. 
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   * Each setup with and without a high-pass filter after the antenna element   * Each setup with and without a high-pass filter after the antenna element
  
-<WRAP round tip> +=== OK3ZB ARA-2000 LNA ===
-**Somebody was also thinking in these directions:**\\ +
-http://lna4all.blogspot.de/2013/04/lna-for-all-low-noise-amplifier-for.html+
  
 +{{:mission:log:2015:08:18:a2000-schematic.jpg?320|}}
 +{{:mission:log:2015:08:18:a2000-pcb.jpg?320|}}
  
-</WRAP>+See also: http://blog.brichacek.net/klon-sirokopasmove-aktivni-anteny-ara-2000/
  
 +=== LNA4All ===
 +
 +http://lna4all.blogspot.de/2013/04/lna-for-all-low-noise-amplifier-for.html
 ==== Ultra-Cheap LNA alternatives ==== ==== Ultra-Cheap LNA alternatives ====
  
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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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   - Remove Aslan S22 release liner (protective foil with the printed red grid)   - Remove Aslan S22 release liner (protective foil with the printed red grid)
   - Place antenna element on self-adhesive side of Aslan S22 according to spec above   - Place antenna element on self-adhesive side of Aslan S22 according to spec above
-  - Get a cylinder with 80mm diameter and place the right end of the assembly on it+  - Get a [[http://www.acrylformen.de/shop/de/Acryl-/-Plexiglas-Rohr/Plexiglasrohr-AD80-mm|cylinder with 80mm diameter]] and place the right end of the assembly on it
   - Begin rolling the assembly around the cylinder (clockwise from top view)   - Begin rolling the assembly around the cylinder (clockwise from top view)
   - Roll the release liner around the assembly and fixate it with tape   - Roll the release liner around the assembly and fixate it with tape
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 **Related Mission-Logs:**\\ **Related Mission-Logs:**\\
 [[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:2015:08:18:another-active-wideband-receiver-antenna-ara-2000-with-lna-rebuild]]
 </WRAP> </WRAP>
  
Trace:

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