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mission:log:2012:08:02:active-wideband-receiver-antenna-for-sdr [2014/11/05 12:39] – [Replication] chrono | mission: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 ====== |
[{{ : | [{{ : | ||
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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 // | 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 // | ||
- | [{{: | + | [{{: |
- | er Antenna Element}}] | + | |
[{{: | [{{: | ||
[{{: | [{{: | ||
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[[http:// | [[http:// | ||
- | [[http:// | + | [[http:// |
==== Structure Tube ==== | ==== Structure Tube ==== | ||
- | Further analysis and research regarding material and availability lead to the speculative conclusion, that this foil probably is [[http:// | + | Further analysis and research regarding material and availability lead to the speculative conclusion, that this foil probably is [[http:// |
[{{: | [{{: | ||
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=== Properties === | === Properties === | ||
- | | Material | [[http:// | + | | Material | [[http:// |
| Length | 405mm | | | Length | 405mm | | ||
| Width | 405mm | | | Width | 405mm | | ||
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[[http:// | [[http:// | ||
+ | ==== NEC2 Simulation ==== | ||
+ | |||
+ | First NEC2 Simulation efforts by Samuel Burri: | ||
+ | |||
+ | {{: | ||
+ | |||
+ | https:// | ||
===== 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/ | 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/ | ||
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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:// | + | |
+ | {{: | ||
+ | {{: | ||
- | </WRAP> | + | See also: http:// |
+ | === LNA4All === | ||
+ | |||
+ | http:// | ||
==== Ultra-Cheap LNA alternatives ==== | ==== Ultra-Cheap LNA alternatives ==== | ||
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[{{: | [{{: | ||
- | This is a close-up of the inside PCB and the used MMIC. Confusingly the pin-numbering of the MMIC is obviously | + | This is a close-up of the inside PCB and the used MMIC. Confusingly the pin-numbering of the MMIC is obviously |
[{{: | [{{: | ||
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**Related Mission-Logs: | **Related Mission-Logs: | ||
[[mission: | [[mission: | ||
- | [[mission: | + | [[mission: |
- | [[mission: | + | [[mission: |
+ | [[mission: | ||
</ | </ | ||