[TenTec] High stability frequency reference oscillator for theOrion II

[Linwood Davis]

Hi Ron,

I did get a firm quote of $135 each for 10 pieces, with a 12 week lead time!

You had a concern about the output. I asked for the LVCMOS output option 
to make it a little simpler, however some care is still needed.

I checked the markings on the oscillator in my O II and found DFA18 HA, 
not the Siward part! And I can't find a data sheet for it but I am 
fairly certain that it was made by Fordahl.

Yeah, power may have to be provided externally. I wasn't considering 
this at first, but keeping it warm all the time would be good. Let's 
see... the warm-up drift is 0.1ppm, or 1.4 hz on 20 meters. And the max. 
draw during warm-up is 3.6 W, roughly 3/4 amps at 5V. Not sure if we can 
pull this from the O II somewhere...

Anyway, this may all be for naught, since there are still too few who 
are interested. Don't really want to shell out $1350 + shipping to make 
it happen.

Lin,
WB1AIW

Ron Castro wrote:
> I would be very interested in participating, and yes, I believe the 
> "original" Orion used the same oscillator.  While the mod on my website 
> mitigates the problem considerably, it can't really cure it.  Looking at the 
> spec sheet of the AOCJY, it appears to be available in the correct operating 
> voltage, excellent phase noise. The sine wave output is shown at +2 dBm @ 50 
> Ohms output load while the original shows 1 V P-P into 10 k Ohms.  This 
> should probably be looked into.  Here are the specs of the Siward (I just 
> noticed my website link needs to be changed):
>
> http://www.datasheetarchive.com/TXO32-datasheet.html
>
> Another minor problem is that the AOCJY appears to be an SMT device, so some 
> sort of PC board would need to be designed to convert the architecture. 
> That would be good though since the AOCJY accommodates an external 
> adjustment pot that should make calibration a breeze.  Also because since 
> its an oven-controlled device, an external 5 or 3.3 VDC regulator/filter 
> will be needed along with a direct connection to 13.6 VDC so the oven stays 
> on when the power switch is off.
>
> BTW...did you ever notice that most new Orions are 20 Hz off frequency on 20 
> Meters?  I heard that regularly on the TT Sunday net when I first started 
> checking in.  That's apparently because when they are adjusted at the 
> factory, the radio is upside down with the cover off and the compartment is 
> at room temp.  Normally that compartment gets to over 100 degrees F without 
> the fan mod!
>
> A friendly call to TT might be in order to see if these specs will work, and 
> once done, you should have no trouble finding ten folks who want go in.
>
>             Ron  N6IE
>        www.N6IE.com
>
>
>   
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