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mission:log:2012:08:02:active-wideband-receiver-antenna-for-sdr [2014/07/06 12:02]
beckgyver [Ultra-Cheap LNA alternatives]
mission:log:2012:08:02:active-wideband-receiver-antenna-for-sdr [2017/01/04 23:32] (current)
chrono [Antenna Element]
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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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 ==== 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.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}}]
  
 The schematic revealed no surprise. It seems that a Zener-diode was used to stabilize the voltage of standard 12V BIAS supplys to the needed 5V. The schematic revealed no surprise. It seems that a Zener-diode was used to stabilize the voltage of standard 12V BIAS supplys to the needed 5V.
-On the input-path there seems to be high-pass filter ​after the decoupling C.+On the input-path there is attenuator installed, right after the first decoupling C. It seems that it has an attenuation of 3 dB.
  
 In order to be used with a direct power supply you have to remove two inductors on the input and output Path of the power supply. In order to be used in different positions in the signal path I solderd two SMA plugs in the case, after removing the standard F-connectors. In order to be used with a direct power supply you have to remove two inductors on the input and output Path of the power supply. In order to be used in different positions in the signal path I solderd two SMA plugs in the case, after removing the standard F-connectors.
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 This one was equiped with cables to be installed better. This one was equiped with cables to be installed better.
  
-[{{:​mission:​log:​2012:​08:​02:​20140628_223107.jpg?​295|Amplifier ready for use}}] 
  
-Additional pictures of the first tests and some measurements ​will be done as soon as there is some spare time for those things.+[{{ :​mission:​log:​2012:​08:​02:​20140628_223107.jpg?​295 |Amplifier ready for use}}] 
 + 
 +The first picture was taken with an Agilent network-analyzer. In advance to the measurement the device has been calibrated. The device number ​will be added in some days, I forgot to write it down :-) I think it is an [[http://​www.home.agilent.com/​en/​pd-1000003538%3Aepsg%3Apro-pn-E8357A/​pna-network-analyzer-300-khz-to-6-ghz?&​cc=DE&​lc=ger|Agilent E8357A]]. Sorry for the bad quality but there was no passibility to change the resolution. 
 + 
 +For this test I put an attenuator with 10dB in the output-path of the measurement. Keep in mind that there is a attenuator circuit installed on the input path of the amplifier. I will make some measurements after removing it later. 
 + 
 +[{{ :​mission:​log:​2012:​08:​02:​power_on_log_5ghz.png?​350 |1MHz - 5 GHz logarithmic,​ all parameter, 10 dB attenuator}}] 
 + 
 +The other pictures were made with an [[http://​www.home.agilent.com/​en/​pd-1685432-pn-E5071C/​2-port-test-set-300-khz-to-14-ghz-with-bias-tees?​nid=-536902682.903457.00&​cc=DE&​lc=ger|Agilent E5071C]]. The analyzer was calibrated befor test. In this test there was no attenuator present in the signal path and the stimulus was set to -30dBm. 
 + 
 +[{{:​mission:​log:​2012:​08:​02:​passive.png?​295|passive behavior}}] 
 + 
 + 
 +[{{:​mission:​log:​2012:​08:​02:​30dbm_stimulus_wo_attenuator.png?​295|active bahavior with no attenuator}}]
  
-To put it in a nutshell: Thes amplifiers are just amazing after you clean them and I was surprised of the performance. A comparison to LNA4all and similar projects will be done as soon as the orders arrive.+To put it in a nutshell: Thes amplifiers are just amazing after you clean them and I was surprised of the performance. A comparison to LNA4all and similar projects will be done as soon as the orders arrive. If someona has other amplifiers to be tested please let me know and we can comepare even more amplifiers out there.
  
 ===== Bias-Tee ===== ===== Bias-Tee =====
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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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 <WRAP round tip> <WRAP round tip>
 **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:​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>​