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MARTIN - G8JNJ - Active antennas



Current status: normal - monitoring
Number of users monitoring this page: 0
Most recent sizable change (text, html) : 2018-04-17 16:51
Most recent change (text, html) : 2018-04-17 16:51
Last checked for changes: 2018-07-15 16:51
ChangeDetection started monitoring: 2014-06-20 16:51
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summary of most recent changes

Showing 1 - 5 of 25 1 2 3 4 [next]

View changes:  2018-04-17 16:51    255 new words, 24 deleted words, 3% change   
... strong handling performance. Active Loop Antennas Wellbrook ALA1530 and ... up six of them. So , so I think that I need ... try starting construction againwouldn't reccomend this one ... there are better alternatives. LZ1AQ ... _Empfang.pdf MFJ-1886 active loop ... >10MHz. Ramsey Electronics - Signal ... shown below. Norton Lossless Feedback Norton Amplifiers use a transformer ... under the title, ... strong handling performance. Active Loop Antennas Wellbrook ALA1530 and ... up six of them, so I wouldn't reccomend this one ... there are better alternatives. LZ1AQ ... _Empfang.pdf MFJ-1886 active loop ... >10MHz. Ramsey Electronics - Signal ... shown below. Norton Lossless Feedback Norton Amplifiers use a transformer ... using MRF581 transistors DXE RPA-1 Another type of design ... K9AY loops . The circuit has been ... strong handling performance. ... up six of them. So I think that I need ... try starting construction again. LZ1AQ ... under the title, High dynamic range transistor ... The circuit has been    more...

View changes:  2018-04-16 16:51    233 new words, 33 deleted words, 3% change   
... condensation inside the case.. . The number of turns ... OIP2 = +46.6 75dBm and & OIP3 to be = +28.832dBm O wen Owen Duffy has performed a ... Hz mains hum. PA3FWM Mini-Whip Update Pieter, PA3 ... nl:8901/ Hope As you can see ... added some extra components to build Pieter's design. This ... add some input protection and test one also to allow adjustment of these the bias current for ... 1m whip antenna ... condensation inside the case. The number of turns ... OIP2 = +75dBm & OIP3 ... = +32dBm Owen Duffy has performed a ... Hz mains hum. PA3FWM Mini-Whip Pieter, PA3 ... nl:8901/ As you can see ... added some extra components to Pieter's design. This ... add some input protection and also to allow adjustment of the bias current for ... 1m whip antenna in place of the plate or small wire ... not as good. Chris Trask has ... condensation inside the case.. The number of turns ... OIP2 = +46.6 dBm and OIP3 to be = +28.8dBm O wen Duffy has performed a ... Hz mains hum. Update Pieter, PA3 ... nl:8901/ Hope to build and test one of these in ... the near future Chris Trask has also has produced a number of ... for the VLF bands I?m currently using this design ... additional modifications. http:/ /www.cliftonlaboratories. ... omitted them. As ...    more...

View changes:  2018-01-06 16:51    73 new words, 4 deleted words, 1% change   
... Hz mains hum. Update Pieter, PA3FWM has produced another updated Mini-Whip design based on PA0RDT's original. http://www.pa3fwm.nl/ ... University of Twente WEB SDR http://websdr.ewi.utwente.nl:8901/ Hope to build and test one of these in the near future Chris Trask has also ... the VLF bands I?m currently using this ... Q1 Pages 30 ? 36. Entitled ?A New Type of ... and 435 MHz Receivers... Hz mains hum. Update Pieter, PA3FWM has produced another updated Mini-Whip design based on PA0RDT's original. http://www.pa3fwm.nl/ ... University of Twente WEB SDR http://websdr.ewi.utwente.nl:8901/ Hope to build and test one of these in the near future Chris Trask has also ... the VLF bands I?m currently using this ... Q1 Pages 30 ? 36. Entitled ?A New Type of ... and 435 MHz Receivers? By M Martin, ... Hz mains hum. ... the VLF bands Im currently using this ... Q1 Pages 30 36. Entitled A New Type of ... and 435 MHz ReceiversBy M Martin,    more...

View changes:  2017-09-24 16:51    70 new words, 32 deleted words, 1% change   
... The reason Mini-Circuits doesn?t specify an operating ... now 10KHz. By omitting the ferrite beads and adding an additional HF ... GHz. In the original circuit (shown above) I used BAT81 ... response too dramatically. However when used in this configuration they can seriously degrade ... series connected, reverse biased diodes is shown below. By omitting the ferrite beads and adding an additional HF ... The reason Mini-Circuits doesn?t specify an operating ... now 10KHz. By omitting the ferrite beads and adding an additional HF ... GHz. In the original circuit (shown above) I used BAT81 ... response too dramatically. However when used in this configuration they can seriously degrade ... series connected, reverse biased diodes is shown below. Here's a screen grab The reason Mini-Circuits doesnt specify an operating ... response too dramatically. By omitting the ferrite beads and adding an additional HF ... can also be raised to somewhere around 1GHz. Here's a screen grab    more...

View changes:  2017-08-19 16:51    129 new words, 5 deleted words, 2% change   
... to be done. Owen Note that it's not a good idea to add ... 3 to be = +28.8dBm O wen Duffy has performed a ... MHz. The measured IPIMD performance was OIP2 = +59.1dBm and OIP3 seems to be = +43.8dBm which is about 1012dB better than PA ... slightly larger whip antenna , which will provide improved S/N performance without introducing significant a significantly higher level of intermodulation products. Here ... to be done. Note that it's not a good idea to add ... 3 to be = +28.8dBm O wen Duffy has performed a ... MHz. The measured IMD performance was OIP2 = +59.1dBm and OIP3 ... to be = +43.8dBm which is about 12dB better than PA ... slightly larger whip antenna , which will provide improved S/N performance without introducing a significantly higher level of intermodulation products. Here to be done. Owen Duffy has performed a ... MHz. The measured IP3 seems to be ... about 10dB better than PA ... without introducing significant intermodulation products. Here    more...


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