Return-Path: X-Spam-DCC: paranoid 1233; Body=2 Fuz1=2 Fuz2=2 X-Spam-Checker-Version: SpamAssassin 3.1.3 (2006-06-01) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-0.0 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL, HTML_MESSAGE,HTML_TINY_FONT autolearn=no version=3.1.3 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by paranoid.lipkowski.org (8.13.7/8.13.7) with ESMTP id u0PMOl8q016822 for ; Mon, 25 Jan 2016 23:24:47 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1aNpVt-0006so-9j for rs_out_1@blacksheep.org; Mon, 25 Jan 2016 22:21:33 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1aNpVs-0006sf-T8 for rsgb_lf_group@blacksheep.org; Mon, 25 Jan 2016 22:21:32 +0000 Received: from mail-wm0-f51.google.com ([74.125.82.51]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES128-GCM-SHA256:128) (Exim 4.86) (envelope-from ) id 1aNpUs-0007k4-FD for rsgb_lf_group@blacksheep.org; Mon, 25 Jan 2016 22:21:31 +0000 Received: by mail-wm0-f51.google.com with SMTP id l65so82378868wmf.1 for ; Mon, 25 Jan 2016 14:20:10 -0800 (PST) X-DKIM-Result: Domain=gmail.com Result=Good and Known Domain DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type; bh=oW2h8z9nMZOOfLqaW6tXHzZhQtBTCGbSHqcQqaUAC68=; b=SLule1KG41qUOGmeAouqaBfNXxXPxlHKI2awVDR/qx5lT6+N8A6LG619xUMM/KYfWJ zonc7vOBJeNHgPVwa6NReJCiGc81ysQYnX1/lT68WaQNmNQLdKt9PyW3O4QI3dqxXqfm hHjVKwLOf+cdN7/AqFuJlvxQZpKYt1AgBsMLMIEmFyzzqlA17K8Eypgply1801I4Kh4d F7k8bxpLZIyZTrZcPNNxvhXe4rf4qS+rDbJNvqbCbNgQlA2C+JDm5EmTKCDQo4aooS/d /B0NFcU2R42ph6SFVwirhfnCwe20+BYrggXUIsryvGQSq5TtdsxAeFQGUanVr8L4jD4B CqTg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:in-reply-to:references:date :message-id:subject:from:to:cc:content-type; bh=oW2h8z9nMZOOfLqaW6tXHzZhQtBTCGbSHqcQqaUAC68=; b=DeGHL8xnf60exfF0+tkCc8J3Lk1fCv6c85c98ULcDgDi4H3PJw6qrlnoRamHt1lige jERvkKKwVf/kIjC4Vs/lvub0acTrM4tsyF453ctVkPOEnMPFy+aEtfPtWDrcBrmllTQd 17qA4Y924prJl0SNRz+2ZFU3jrK+BXms5vJAXhrE2al6QthcasGH8b8M5sWtNmKi1j26 dk3vemtNjXh0o4RRcRudjhBJFvq3RA/9VeaDLHa1x3toYvwSS1JfFrmVLr/o7xlrxyMB HBwdAF+f2XAYIJy6yH9Ynl2DBh3n2oSNdnsMIoqi+KXg1OV7vXA/imzidIJ8H4e0i0UZ nJfA== X-Gm-Message-State: AG10YOQKGVx7q+CzA6KtexyrgeoagnECUfZn/5u0vYf/4+T5BYr+mdiGagGbmsa7kAoIV9h+xbyniR5SaVIZ/w== MIME-Version: 1.0 X-Received: by 10.194.117.200 with SMTP id kg8mr12834891wjb.42.1453760365040; Mon, 25 Jan 2016 14:19:25 -0800 (PST) Received: by 10.28.150.6 with HTTP; Mon, 25 Jan 2016 14:19:24 -0800 (PST) In-Reply-To: <56A69BB1.7010105@freenet.de> References: <56A69BB1.7010105@freenet.de> Date: Mon, 25 Jan 2016 22:19:24 +0000 Message-ID: From: Andy Talbot To: rsgb_lf_group@yahoogroups.co.uk Cc: rsgb_lf_group@blacksheep.org X-Scan-Signature: 49da477724dcbe37f1e9a7ff55a3b02e Subject: LF: Re: [rsgb_lf_group] GPSDO experiments Content-Type: multipart/alternative; boundary=001a1130cb72259ea9052a2ff652 X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false X-Scanned-By: MIMEDefang 2.56 on 10.1.3.10 Status: RO X-Status: X-Keywords: X-UID: 6524 --001a1130cb72259ea9052a2ff652 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Yes that is wide, but I have seen OCXOs with as wide a tuning range as that. Perhaps it is one designed for just 1V of tuning range. Yet, there are otehr types that only vary a fraction of a PPM over several volts. Noting is standard when it comes to frequency standards :-) Andy G4JNT On 25 January 2016 at 22:03, Wolfgang B=C3=BCscher dl4yhf@freenet.de [rsgb_lf_group] wrote: > > > Greetings all, > > My GPSDO prototype (with not just a frequency-locking, but also > phase-locking loop) seems to run reliably now. > But there is one thing which puzzles me, maybe someone here has more > experience with 'commercial' VCOCXOs. > Mine was found at a hamfest, labelled "OFC MC598X4 - 010W 10.000000 MHz" > The tuning range, compared against GPS, is as follows: > > Vctrl =3D 0 V -> output frequency 10 MHz - 57 Hz > Vctrl =3D 5 V -> output frequency 10 MHz > Vctrl =3D 12 V -> output frequency 10 MHz + 80 Hz > > So the 'electric' tuning range is - 5.7 ppm to + 8 ppm. > Isn't this a bit much for an oscillator labelled "10.000000 MHz" ? > I had expected a tuning range of a few Hz (since the frequency is > specified with 1 Hz resolution on the label). > > If anyone is interested in the PIC "C" sourcecode (written for a > PIC16F1783), I can post it on a website as soon as some cosmetic issues > (and curses about the PIC datasheet) have been fixed / removed. > > All the best, > Wolf DL4YHF . > > __._,_.___ > ------------------------------ > Posted by: =3D?UTF-8?Q?Wolfgang_B=3Dc3=3Dbcscher?=3D > ------------------------------ > Reply via web post > > =E2=80=A2 Reply to sender > =E2=80=A2 Reply to group > = =E2=80=A2 Start > a new topic > > =E2=80=A2 Messages in this topic > > (1) > Visit Your Group > > > - New Members > > 1 > > [image: Yahoo! Groups] > > =E2=80=A2 Privacy =E2=80=A2 > Unsubscribe > =E2= =80=A2 Terms > of Use > > . > > __,_._,___ > --001a1130cb72259ea9052a2ff652 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
Yes that is wide, but I have seen OCXOs with as wide a tun= ing range as that.=C2=A0 Perhaps it is one designed for just 1V of tuning r= ange. =C2=A0
Yet, there are otehr types that only vary a fraction of a = PPM over several volts.

Noting is standard when it= comes to frequency standards :-)=C2=A0

Andy =C2= =A0G4JNT


On 25 January 2016 at 22:03, Wolfgang B=C3=BCscher dl4yhf@freenet.de [rsgb_lf_group] <rsgb_lf_group@yahoogroups.co.uk> wrote:
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=C2=A0
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Greetings all,

My GPSDO prototype (with not just a frequency-locking, but also
phase-locking loop) seems to run reliably now.
But there is one thing which puzzles me, maybe someone here has more
experience with 'commercial' VCOCXOs.
Mine was found at a hamfest, labelled "OFC MC598X4 - 010W 10.000000 M= Hz"
The tuning range, compared against GPS, is as follows:

Vctrl =3D 0 V -> output frequency 10 MHz - 57 Hz
Vctrl =3D 5 V -> output frequency 10 MHz
Vctrl =3D 12 V -> output frequency 10 MHz + 80 Hz

So the 'electric' tuning range is - 5.7 ppm to + 8 ppm.
Isn't this a bit much for an oscillator labelled "10.000000 MHz&qu= ot; ?
I had expected a tuning range of a few Hz (since the frequency is
specified with 1 Hz resolution on the label).

If anyone is interested in the PIC "C" sourcecode (written for a =
PIC16F1783), I can post it on a website as soon as some cosmetic issues (and curses about the PIC datasheet) have been fixed / removed.

All the best,
Wolf DL4YHF .

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__._,_.___
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Posted by: =3D?UTF-8?Q?Wolfgang_B=3Dc3=3Dbcscher?=3D <dl4yhf@freenet.de> =
Reply via w= eb post =E2=80=A2 Reply to sender =E2=80=A2 Reply to group =E2=80=A2 Start= a new topic =E2=80=A2 Messages in this topic (1)
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Visit Your Group
3D"Yahoo!
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