Path: csiph.com!eternal-september.org!feeder.eternal-september.org!nntp.eternal-september.org!.POSTED!not-for-mail From: "Don" Newsgroups: sci.electronics.design Subject: Re: Ham shack satellite communications Date: Wed, 16 Sep 2026 14:54:20 -0000 (UTC) Organization: A noiseless patient Spider Lines: 50 Message-ID: <20260916c@crcomp.net> References: <20260914a@crcomp.net> <118e621$a3qb$1@solani.org> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Injection-Date: Wed, 16 Sep 2026 14:54:21 +0000 (UTC) Injection-Info: dont-email.me; logging-data="3662524"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX18hXwtDtYRQRcPzwQY7inxM"; posting-host="3b61c703cc60f6405ed99a12601d4181" Cancel-Lock: sha1:skYefEt66WsKecfhYAZxQthZvAk= sha256:iRokFWxUWKXrlxAt6PTTRE6qkn8HfrQDk9lTz9LCtmY= sha1:qkwbMXQvu2fvQlc8ROoo3oXxnWM= sha256:fLj1ISjKmA9LeaNjxCRWXENRno5TRaxCMc40f9fbX6k= Xref: csiph.com sci.electronics.design:747813 Gerhard Hoffmann wrote: > Am 14.09.26 um 17:14 schrieb Don: >> It seems best to start with the receiver. Here's one simple receiver >> schematic: >> >> eggbeater antenna -> LNA -> LMR 200 -> RTL-SDR -> FreeBSD >> >> What's your favorite eggbeater and why? >> >> What's your favorite LNA and why? > For 432 it is this one > > > Why? because I made it to fit my likings. > > Selectivity: > < > > > > DL7APV (RIP) measured 0.25 dB noise figure, my own 8970B said 0.5 dB. > The difference could have to do with the bandwidth of the SAW filter > on 432 MHz vs. the bandwidth of the noise meter, and my 346C noise head > + Rosenberger attenuator hasn't seen a cal lab for a long time. > > > You might be interested in these email reflectors: > > https://groups.io/g/Moon-Net > > https://groups.io/g/Amateur-DSN/ Your custom LNA is perfect! It inspires me to make my own LNA, after my nascent satellite station becomes fully functional for both transmission and reception. For the time being my strategy is to minimize my learning curve. It's supposedly possible to run DC over coax to the LNA. But again, to minimize my learning curve, a separate outdoor DC cable will be used instead. Thank you for sharing the email reflectors. A Deep Space Exploration Society spokesman also showed up at my Divisional ham convention. Danke, -- 73, Don, WD7Q veritas _|_ liberabit | https://www.qsl.net/wd7q vos |