LF: Re: [rsgb_lf_group] GPSDO experiments

[Andy Talbot <andy.g4jnt@gmail.com>]

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 Büscher dl4yhf@freenet.de [rsgb_lf_group] <rsgb_lf_group@yahoogroups.co.uk> 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 = 0 V -> output frequency 10 MHz - 57 Hz
Vctrl = 5 V -> output frequency 10 MHz
Vctrl = 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: =?UTF-8?Q?Wolfgang_B=c3=bcscher?= <dl4yhf@freenet.de>

---

Reply via web post

•

Reply to sender

•

Reply to group

•

Start a new topic

•

Messages in this topic (1)

Visit Your Group

• New Members 1

• Privacy • Unsubscribe • Terms of Use

.

__,_._,___