Re: Synchronized and stable GPS phase lock for KX3, K3 and XV transverters

[W7CS]

GPS stabilized 10 MHz crystal oscillators are really an overkill, to
be references for todays transceivers.

A good DOCXO, double ovenized crystal oscillator, is more than
adequate, some even claiming accuracies of 10 parts to the -11th
.   I have purchased several, through Internet advertisers, for well
under $50, including shipping from Chinese surplus dealers.  These
are usually American or Russian surplus units, that are being resold
through these sources.  I've had repeatedly good and fast service
from them.   Some of these advertise on E-Bay.

I also have Thunderbird and HP GPS stabilized units, as well as
Rubidium standards, that could be used.  I find that their bulk,
complexity and extra wiring is cumbersome and unnecessary, for even
up to and including my 10 GHz operations.

On my K3/10, which I use for a lot of my V/U/ uW xvrtr needs, as an
IF xcvr,  I even mount an OCXO, dead bug style to the inside of the
'blank' rear panel of the K3/10 (with "Goop" adhesive), and run it's
output to an SMA feed through connector.   I can then either use a
SMA jumper cable to connect to the EXREF input, or to a power
splitter, to also to be used as a 10MHz reference for my
xvrtr(s).  This certainly makes a very simple and compact solution.

Chuck,  W7CS

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[Sverre Holm (LA3ZA)]

A question regarding the DOCXO, double ovenized crystal oscillator to Chuck, W7CS. I'm completely new to this, but after having looked at a few in ebay, I see that they have an input for frequency control.

Do you use them as is, or do you calibrate them by setting the control voltage? And how much variation in frequency is typical to achieve with this control voltage, ie how much off frequency can they be if unadjusted?

Thanks,

[David Pratt]

Have a look at this, Sverre, it will tell you all you want to know.

http://www.ve2azx.net/technical/MV89A-1.pdf

73 de David G4DMP

In a recent message, "Sverre Holm (LA3ZA)" <[hidden email]> writes
>A question regarding the DOCXO, double ovenized crystal oscillator to Chuck,
>W7CS. I'm completely new to this, but after having looked at a few in ebay,
>I see that they have an input for frequency control.
>
>Do you use them as is, or do you calibrate them by setting the control
>voltage? And how much variation in frequency is typical to achieve with this
>control voltage, ie how much off frequency can they be if unadjusted?

--
 + - - - - - - - - - - - - - - - - +
 | David M Pratt, Kippax, Leeds.   |
 | Website: http://www.g4dmp.co.uk |
 + - - - - - - - - - - - - - - - - +

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