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1. LF: DK7FC VLF probe (score: 1): Author: [email protected]; Date: Fri, 8 May 2015 22:14:16 -0230 (NDT); Hi Stefan and group, I am building a probe using your design. Could you explain the interstage network and the 470 uH choke? I hope to use this to detect some 36 km photons. So far, using the PA0RDT; /rsgb_lf_group-archives/html/rsgb_lf_group/2015-05/msg00040.html (9,249 bytes)
2. Re: LF: DK7FC VLF probe (score: 1): Author: DK7FC <[email protected]>; Date: Sat, 09 May 2015 14:22:57 +0200; Hi Joe, That choke was just intended to improve the supply voltage stability (low pass filtering). It's value is not critical. Meanwhile i've learned that it can be helpful to spend a ferrite bead in; /rsgb_lf_group-archives/html/rsgb_lf_group/2015-05/msg00042.html (11,137 bytes)
3. Re: LF: DK7FC VLF probe (score: 1): Author: [email protected]; Date: Sat, 9 May 2015 10:40:54 -0230 (NDT); Stefan, Thanks for the info and advice. Yes, ferrite beads sound like a good idea. The resistors and caps (1M 100k 68pF 680pF etc) between the FET's are for lowpass or something else? 73 Joe VO1NA Hi; /rsgb_lf_group-archives/html/rsgb_lf_group/2015-05/msg00044.html (10,797 bytes)
4. Re: LF: DK7FC VLF probe (score: 1): Author: DK7FC <[email protected]>; Date: Sat, 09 May 2015 15:17:17 +0200; Am 09.05.2015 15:10, schrieb [email protected]: [...]The resistors and caps (1M 100k 68pF 680pF etc) between the FET's are for lowpass or something else? R, cfm. 73, Stefan; /rsgb_lf_group-archives/html/rsgb_lf_group/2015-05/msg00045.html (10,779 bytes)
5. Re: LF: DK7FC VLF probe (score: 1): Author: [email protected]; Date: Sat, 9 May 2015 10:57:25 -0230 (NDT); Thanks Stefan, I'll post a progress report soon. Tomorrow a 10k race! 73 Joe Am 09.05.2015 15:10, schrieb [email protected]: [...]The resistors and caps (1M 100k 68pF 680pF etc) between the FET's are for; /rsgb_lf_group-archives/html/rsgb_lf_group/2015-05/msg00046.html (10,207 bytes)

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