To: | [email protected] |
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Subject: | Re: LF: Do I need an attenuator on LF RX?? |
From: | John Rabson <[email protected]> |
Date: | Mon, 12 Feb 2018 18:08:41 +0100 |
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Sender: | [email protected] |
Possibly DCF39 and its companion? I believe they are used to control some sort of electricity grid. John F5VLF > On 12 Feb 2018, at 17:47, Chris Wilson <[email protected]> wrote: > > > > Hello Mike, I just listened to what looks like the AM modulated bursts > around 139 and 135.5 kHz and they sound like bursts of data, nothing > intelligible whatsoever. > > Monday, February 12, 2018, 4:26:13 PM, you wrote: > >> Chris, > >> It looks like you have a broadcast station where it shouldn't be (at >> 132.65kHz) and several other spurious stations in that area, so you >> may well have unwanted signals within the 136kHz band, especially at >> night (your recording seems to have been done during the middle of >> the day). You might improve things by by-passing the pre-amp. It >> would do no harm just by experimenting with an attenuator but why >> attenuate and amplify at the same time unless the preamp also >> provides another function such as matching? It seems the only >> front-end selectivity on that receiver is a narrow bandpass so you >> would really benefit from some additional wider filtering, eg an LPF >> with a cut-off just below the LW BC band. > >> Mike, G3XDV > > > > > > -- > Best regards, > Chris mailto:[email protected] > > |
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