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LF: RE: Tx driver chips

To: [email protected]
Subject: LF: RE: Tx driver chips
From: "Talbot Andrew" <[email protected]>
Date: Wed, 13 Jun 2001 11:43:43 +0100
Reply-to: [email protected]
Sender: <[email protected]>
Instead of trying to control nanosecond long crossover problems and skew in
driver chip propagation times, why not employ the Decca Tx approach of a
small value (damped) inductor between the top and bottom power devices to
'soak up' the high current short pulses.
It certainly works in my direct from mains Tx.

Andy  G4JNT


-----Original Message-----
From: Rik Strobbe [mailto:[email protected]]
Sent: 2001-06-13 12:01
To: [email protected]
Subject: Re: LF: RE: 73kHz tests tonight


At 10:25 13/06/01 +0200, you wrote:
>Could TC4428 be keyed in G3YXM design? If so, it would simplify the whole
>schematic.
>
>Petr, 'FIG

Petr,

That idea crossed my mind 2 years ago when building my TX (variation on the
YXM design). But due to different delay times in the inverting and
non-inverting drivers (I measured abt. 25ns difference) I didn't use the
4428 it.
If you don't wan't to use a flip-flop to get the counter-phase signals you can use a couple of CMOS XOR gates, with a CD4077 running on 15V I measured
less than 3ns difference between the inverting and non inverting gate.

73, Rik ON7YD

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