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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