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Re: NRZI to NRZ converter



Hi all,

Don't waste any time - I found it. Thanks anyway. I found my MFJ circuit
diagram. I thought the NRZI-NRZ conversion was done by the SIO, but there's
a semi discrete state machine doing it consisting of an EPROM and a set of D
type latches so it's a lot easier than I thought.

Pin 16 of U5, or pin 12 of U21 on the main board appears to be the answer on
an MFJ -1278 with an MFJ 9600 modem card in it.

73 Howard G6LVB.

----- Original Message -----
From: "Howard Long" <howard@howardlong.com>
To: <amsat-bb@AMSAT.Org>
Sent: Wednesday, November 15, 2000 7:38 AM
Subject: [amsat-bb] NRZI to NRZ converter


> Greetings
>
> Thinking I'd be away for the launch, I didn't bother attempting to get
> anything ready for the 9600bps IHU launch downloads.
>
> However, as there's been a delay I'm now in a position to be there & so
I'd
> like to cobble something together.
>
> I vaguely remember somewhere that an NRZI to NRZ conversion can be done
with
> a single J-K flip flop, but maybe someone can point me to a circuit. I've
> got an idea myself, but if it doesn't work, I've only got one shot at
> getting it right!
>
> Either that or can someone point me to where I can extract the NRZ RX data
> from either a Paccomm NB96 or an MFJ-1278.
>
> Thanks, Howard G6LVB
>
> ----
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>

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