[time-nuts] Loran-C ICs

[John Day]

At 07:45 PM 1/2/2007, John Miles wrote:
>The SA604AD is a favorite of mine, if you need a good IF strip with a
>quadrature detector.

Have to agree. Only ever used them in three designs but two of them 
went into quite high volume back in the late-80's/early-90's and they 
were never a problem. To be honest, I had forgotten about them. We 
moved from the MC1357 to the NE604 (as it was then) and then to DSP 
for FM demodulation.

John

>   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
> >