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Re: LF: FET driver driven direct from a Si5351a questions

To: [email protected]
Subject: Re: LF: FET driver driven direct from a Si5351a questions
From: David Bowman <[email protected]>
Date: Fri, 12 Oct 2018 23:44:05 +0000
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Hi Chris.
Tie the inputs together and drive them with a squarewave.  No divide by 2 necessary (I think...but it is late)
Yes, I would like to try a QSO between us on 136k, just to get the system tested. I'll keep you in touch with progress



On Fri, Oct 12, 2018 at 3:19 PM DAVE PICK <[email protected]> wrote:

The squiggles don't look too bad, are you sure it's not just pick-up on the oscilloscope probe?
It makes a big difference where you put the earth clip in a high-current circuit.

Dave G3YXM

> On 12 October 2018 at 13:42 Chris Wilson <[email protected]> wrote:
> Hello David,
> Thanks for the reply. I will try this I take it you just tie Input A
> and Input B together and feed it a x2 signal with X2 tone spacing if
> using WSPR? I am pretty sure there's either harmonics or another
> frequency riding on CLK1 when in this new Iv mode so I am moving away
> from that as you suggest. I now have a refreshed set up whereby I am
> able to use the TS-590 for sensible TX operation of JT-9 with either the
> Red Pitaya or the 590 as the receiver. So when the LF antenna is
> operational at your end I should be able to work you :)
> Thursday, October 11, 2018, 9:36:03 PM, you wrote:
> > Hi Chris.
> > Not sure I have a solution for the circuit you have. 
> > However, it may be worth not using the 180 degree outputs from the
> > Silab oscillator.  Have you thought about the advantages of a FET driver
> > that has a common input but 2 antiphase outputs ??
> > The TC4428 is an example. They take great care with rise times and
> > propagation delays....perhaps the Si device does not give 'perfect' waveforms.
> > Worth a try ??
> > regards
> > David
> --
> Best regards,
> Chris mailto:[email protected]
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