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| To: | [email protected] |
|---|---|
| Subject: | Re: LF: Pre amp *after* BPF?? |
| From: | N1BUG <[email protected]> |
| Date: | Fri, 16 Mar 2018 09:00:37 -0400 |
| In-reply-to: | <[email protected]> |
| References: | <[email protected]> <CAA8k23SNvwo3aGTizLE059FLZf79p=zam3u2+MaqVAGe7TD7eQ@mail.gmail.com> <[email protected]> |
| Reply-to: | [email protected] |
| Sender: | [email protected] |
| User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.6.0 |
Good point, Rik. I agree. The reason I run preamps is that with the LNV antenna my receivers failed this test without it. :-) 73, Paul N1BUG On 03/16/2018 08:31 AM, Rik Strobbe wrote: > Keep in mind that you only need a pre amp if the "antenna noise" is > below the receiver noise. > > Most receivers have reduced sensitivity at LF / MF, but the > noiselevels at these frequencies is high compared to HF. > > Easy to check: Listen (with connected antenna) on a quiet frequency > (only noise, no signal). Next disconnect the antenna. If the noise > level decreases you do not need a pre amp (in fact a pre amp will > only deteriorate the IMD behavior and thus create more ghost signals). > > > 73, Rik ON7YD - OR7T |
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