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1. LF: RE: FZ-02-B mechanical filter input matching (score: 1): Author: Rik Strobbe <[email protected]>; Date: Wed, 20 May 2015 05:36:35 +0000; Hi Stefan, regarding: Now my question: Is it better to remove a BF981 amp stage (about 16 dB to 18 dB gain!) in front of the mixer (SBL-3) to get a lower RX noise or do i better reduce the gain on th; /rsgb_lf_group-archives/html/rsgb_lf_group/2015-05/msg00125.html (15,071 bytes)
2. LF: RE: FZ-02-B mechanical filter input matching (score: 1): Author: "Clemens Paul" <[email protected]>; Date: Wed, 20 May 2015 16:00:04 +0200; Hi Stefan, A general design rule for cascaded amplification stages is that the noise figure of the first stage is the most crucial one for the overal noise figure. So I would leave the gain before th; /rsgb_lf_group-archives/html/rsgb_lf_group/2015-05/msg00140.html (14,658 bytes)
3. Re: LF: RE: FZ-02-B mechanical filter input matching (score: 1): Author: Markus Vester <[email protected]>; Date: Wed, 20 May 2015 14:58:00 -0400; Hi Stefan, I'd suggest the following test: 1. with the current circuitry, measure the background noise floor on a quiet day with little QRN (ie. not now ;-) 2. temporarily disable the BF981 stage, by; /rsgb_lf_group-archives/html/rsgb_lf_group/2015-05/msg00148.html (11,602 bytes)
4. Re: LF: RE: FZ-02-B mechanical filter input matching (score: 1): Author: DK7FC <[email protected]>; Date: Wed, 20 May 2015 22:18:37 +0200; Thanks Markus and Clemens for the feedback. I will go on soon... 73, Stefan Am 20.05.2015 20:58, schrieb Markus Vester: Hi Stefan, I'd suggest the following test: 1. with the current circuitry, measu; /rsgb_lf_group-archives/html/rsgb_lf_group/2015-05/msg00154.html (11,609 bytes)

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