[DSP-10] OCXO

Sun, 17 Mar 2002 10:24:05 -0600

Hermann, Walter, and others:

I'm glad to see your work in progress on a stable 10 MHz. OCXO 
source.  I think there is a real need to fill the gap between the 
quite expensive (GPS locking and other) and the plain crystal methods 
of generating the reference frequency.

In my case, I'm in the process of building my DSP-10 and the Brooks 
Shera GPS standard, having acquired an HP surplus xtal oscillator 
from eBay.  However, I can envision times where I would prefer to 
leave the GPS standard home where extreme accuracy and stability is 
not required, but something better than a plain xtal oscillator would 
be desired.

Obviously, your work will have applications in other areas of ham 
radio than the DSP-10.  I'm looking forward to see what you fellows 
are able to come up with.

73,
Don AE5K

On 17 Mar 2002 at 5:54, [email protected] wrote:

> Hi  DSP-10 folks.......
> 
> We are over here in Germany (a small DSP-10 group) working on a good
> tradeoff between the price and stability on a 10 MHz OCXO.
> 
> There are several possibilities to gain as much as needed stabillity
> for the DSP-10 and his usage for EME or other weak-signal-work.
> 
> Long time stability in terms of days are maybe not so much of a
> concern. What we think, it is most important to have a short term
> stable OCXO in the range of less than  0.1 Hz per hour or so. GPS
> locked is the most wanted design, but is it really needed???? Some of
> as are able to pay the price, but there are other easy to achive
> hombrew constructions.
> 
> Forehand we like to mention that thing over here are way different
> between you guys in the US and in the European Hamradio community. We
> have to build most of our equipment by ourself. There is no
> Surplusmarket to purchase fine, but old stuff, and for the sake of
> satifaction we should get the best out of our minds and doit
> ourselves. We believe huge bulky GPS RX and controllers and PWS and
> more bulky stuff is firstof not needed. The OCXO we are talking about
> will fit together with the power supply for the DSP-10 and for the
> OCXC itself nearby the Hammond Box and all 3 units again can be seated
> in a nice looking small cabinet. One very good cristal (cut and
> polished according to specs) in the price range of 20 $ to 30 $, an
> 358  OP amp, a PWR Xistor and some ordinary parts out of scrap, a
> prefabricated stable housing and a good soldering iron will doit. It
> runs at 60 Deg. C in a selfmade oven.....For the beginning what else
> do we need????
> 
> Sheras GPS  solution might be the best to get...but we will build this
> oven and get the results and publish them.....at   <A
> HREF="www.walter-schroeer.de">www.walter-schroeer.de</A>  (DC8SW)...
> 
> Pictures of a equivalent OCXO for the freq. range 106.5Mhz can be seen
> at my website  <A
> HREF="www.dc9up.de/id27.htm">www.dc9up.de/id27.htm</A>. It is used as
> a LO for my 10 GHz station and will permit me to hit the freq. less
> then 20 Hz at 10 Ghz. (Sorry, the writing on the website is in German,
> but will be translated soon !! )
> 
> A same design will be used for 10 MHz. After we have finished and
> built this thing ( it may take some weeks) the complete design will be
> available at the above website.
> 
> By the way, this website (walter-schroeer) could be used as a pool for
> European kitters for information exchange...just use the mailback
> button and I will collect all comments and remail them up here on the
> DSP-10 site. The website maybe will be reorganized  to have a webring,
> depending on time and reflections. We still work on it, so pse check
> regular and see how it`s going.
> 
> So far we know, there are about 4 hams on the line in the Euro-land
> for DSP-10:
> 
> DC8SW Walter), DC9UP (Hermann) , HB9DHY (Mike) and some ham from the
> Netherlands (pse contact me again by mail ([email protected])
> because I lost your mail-adress).....
> 
> If somebody likes to know more about, contact me at:    [email protected] 
>     or direct        [email protected].
> 
> 73 de Hermann (DC9UP) and Walter DC8SW)
> 
> (To all of you, pse excuse the writing-errors!!!)