[Milsurplus] [TestEquipTrader] Inductor Design Question

[J. Forster]

> My understanding is that LORAN-A was terminated over thirty years ago.

Yes, it was. But I wan a simulator to drive a DAS-1 LORAN-A on a Museum Ship.

> For a stable oscillator at LORAN-A frequencies, TODAY, you'll have a far
> easier time using an Analog Devices DDS (direct digital synthesis) IC.

The oscillator needs to be keyed. There s no set relationship between the
pulse interval and the carrier phase. I want the oscillator to start up
relatively slowly to get the envelope right.

> For 2 MHz, the AD9834 or AD9850 would work, and you can buy off-the-shelf
> hobby boards for those chips today.
>
> Alternatively, you can probably BUY that inductor from Digi-Key or Newark
> for less than the parts and engineering will cost you.

I have measured some. Their Q sucks.

-John

================
>
> -----Original Message-----
> From: J. Forster
> Sent: Sunday, June 26, 2011 12:29 PM
> To: milsurplus at mailman.qth.net ; TestEquipTrader at yahoogroups.com
> Subject: [TestEquipTrader] Inductor Design Question
>
> I am looking at designng and building an inductor for an LC oscillator for
> a LORAN-A simulator.
>
> The thing needs to be about 50-100 uH at about 2 MHz with a minimum Q of
> 50.
>
> I'm considering:
>
> A small torroid of 67 materal
> A small cup core of 67 material
> An air core coil, like an IF transformer, in a can
> An air core coil with a slug in a can.
>
> I need stability of better than .5% over 20F around room temperatrure.
>
> Any suggestions?
>
> Thanks,
>
> -John
>
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