[time-nuts] Loran-C ICs

John Miles jmiles at pop.net
Tue Jan 2 19:45:49 EST 2007


The SA604AD is a favorite of mine, if you need a good IF strip with a
quadrature detector.  You can still get MC1350Ps from Jameco, but the 1357
is relatively rare (except, as John points out, as an NTE replacement.)

-- john, KE5FX

> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com]On
> Behalf Of John Day
> Sent: Tuesday, January 02, 2007 4:40 PM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] Loran-C ICs
>
>
> Funny you should ask, we had to get some of these to replenish spares
> stock in a client site for some gear we built YEARS ago. The MC1357P
> is available as the NTE708 (around $7.25 each it seems) and the
> MC1350P is an NTE746. The next generation of that design (the MC1350P
> as okay in TV's, but really not a lot of good elsewhere) used some
> VGA chips from Analog Devices, AD6xx series, but I cannot recall
> which. Possibly AD602. We used one of the AD log detectors, possibly
> like an AD8302 to complete the AGC loop. In another design we had the
> FM demodulator in an FPGA and we recovered amplitude information
> after the ADC to close the AGC loop - we need not have rapidly
> varying signals, and then used another small 10 bit ADC to control
> the IF amp chip.
>
> John
>




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