Re: LF: Ebnaut receiver frequency stability qustion

[Markus Vester <markusvester@aol.com>]

Hi Chris,

Kiwi-SDR: Last year I asked the same question to John Seamons, and he explained that the GPS frequency correction is done in software, and won't actually lock the LO phase to GPS.

RSP2: It seems possible to replace the TXCO by an external 24 MHz reference. But the difficulty with the digital output is that you need to be sure that buffer over/underruns never occur in the subsequent audio processing. With an analog receiver, SpecLab can correct glitches when you feed a 1pps time reference to the other soundcard channel. Unfortunately you can't do that with an all-digital audio path.

73, Markus

-----Ursprüngliche Mitteilung-----
Von: Chris Wilson <dead.fets@gmail.com>
An: rsgb_lf_group@blacksheep.org <rsgb_lf_group@blacksheep.org>; rsgb-lf-group@groups.io <rsgb-lf-group@groups.io>; Discussion of the Lowfer (US, European, & UK) and MedFer bands <lowfer@mailman.qth.net>
Verschickt: Di, 18. Dez 2018 23:54
Betreff: LF: Ebnaut receiver frequency stability qustion

Hello  Ebnauters

Would a KiwiSDR (which I do not own but was thinking of buying) have

adequate LF frequency stability for Ebnaut reception given it uses

1PPS from a GPS receiver to stabilize the frequency? Or do I need a

receiver with a true GPS trained reference input? I see only one

cheaper price end RX with such a port, the SDRPlay RSP2, but that

expects a 24 MHz reference input rather than the common 10 MHz. I

have a Trimble Thunderbolt for a 10 MHz reference, but nothing that

could give 24 MHz.

What commercial SDR's could I look to for suitable stability please,

that are good on LF and below, and a reasonable cost? Thanks 2E0ILY

--

Best regards,

Chris                          mailto:dead.fets@gmail.com