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| To: | <[email protected]> |
|---|---|
| Subject: | LF: Re: Re: Loop RX Antennas |
| From: | "Clemens Paul" <[email protected]> |
| Date: | Fri, 6 Jan 2012 11:38:13 +0100 |
| References: | <008301ccc97c$51d9fcf0$0401a8c0@xphd97xgq27nyf>,<CABP+t7Zgr4iUWhCQzTKnqBQFcsK4_=zjuPWd5AHkvU5Tggu1EA@mail.gmail.com> <BF4A524700075746A6467658DFC7102CB0B489A6C5@ICTS-S-EXC2-CA.luna.kuleuven.be>,<003501ccca06$6bdef490$0401a8c0@xphd97xgq27nyf> <BF4A524700075746A6467658DFC7102CB0B489A6C6@ICTS-S-EXC2-CA.luna.kuleuven.be> <[email protected]> <004601ccca20$8aa7d1c0$0401a8c0@xphd97xgq27nyf> <00fc01ccca65$47277e60$1502a8c0@Clemens04> <00d901ccca69$1f897260$0401a8c0@xphd97xgq27nyf> <024c01cccad1$3c099ba0$1502a8c0@Clemens04> <001901cccad5$bff43840$0401a8c0@xphd97xgq27nyf> <017301cccb22$75f61590$1502a8c0@Clemens04> <8E87C709471544DAB8BEACCCBC282F74@JimPC> |
| Reply-to: | [email protected] |
| Sender: | [email protected] |
Hello Jim, interesting points! I should have better talked of *system* noise figure instead of *RX* NF. With your IC-718's NF of 35dB you would need a preamp with a gain of 20dB and a NF of 1dB to reach a 15dB system NF. Are there such preamp designs around somewhere? ...in practice it is fairly easy to hear the band noise with a 1m^2 loop at 136k... ...Measurements here under quiet, daylight wintertime conditions indicate a field strength as low as 60nV/m per sqrt(Hz)... It would be interesting to know if, resp. how much the noise at Mal's location could be lower than at your location at 137kHz. 73 Clemens DL4RAJ----- Original Message ----- From: "James Moritz" <[email protected]> To: <[email protected]> Sent: Thursday, January 05, 2012 10:33 PM Subject: LF: Re: Loop RX Antennas |
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