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From: M0FMT <peteg8fmt@gmail.com>
Date: Fri, 26 Jan 2018 20:11:58 +0000
Message-ID: <CANi3vvsWBGQO18UBWA3kSUpAXOBwni2ifRZKkH+tgbRyoksxyg@mail.gmail.com>
To: rsgb_lf_group@blacksheep.org
Subject: Re: LF: Softrock RX divider IC problem, unexpected frequency out
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Hi all

The important thing is that the frequency is correct (which it is) the wave
form looks OK and the peak to peak volts are enough to drive the flip/flop
There is a bit of second order distortion on the MF LO but it is not an
issue.

I personally would conclude the problem is with the flip flop however try
doing the same at the divide by four LO output check you have two outputs
and if you can compare the phase difference it should be a 1/4 cycle
difference i.e. 90 degree shifted. The level should be similar to the
levels already seen on the first oscillographs. but it can be lower and
still work OK i.e. over the threshold to trigger the multiplex chip
normal TTL levels tolerance.

Good luck 73 petefmt


On Fri, Jan 26, 2018 at 7:36 PM, Chris Wilson <dead.fets@gmail.com> wrote:

>
>
>
>  I just completed two scope measurements at R17 to pin 3 of the divider
>  IC. One of the faulty LF Softrock, and one on my MF one that works
>  fine. the resultant wave forms are quite different. But I am not
>  clever enough to say if they hold the clue, so will post them here.
>  Thanks again.
>
> Faulty LF oscillator or divider first
>
> http://www.gatesgarth.com/R17-to-pin3.jpg
>
>
> Working MF Softrock, same place
>
> http://www.gatesgarth.com/mf-R17-to-pin3.jpg
>
>
>
> --
> Best regards,
>  Chris                            mailto:dead.fets@gmail.com
>
>
>

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<div dir=3D"ltr"><div>Hi all</div><div><br></div><div>The important thing i=
s that the frequency is correct (which it is)=C2=A0the wave form looks OK a=
nd the peak to peak volts are enough to drive the flip/flop There is a bit =
of second order distortion on the MF LO but it is not an issue.</div><div><=
br></div><div>I personally would conclude the problem is with the flip flop=
 however try doing the same at the divide by four=C2=A0LO output check you =
have two outputs and if you can compare the phase difference it should be a=
 1/4 cycle difference i.e. 90 degree shifted. The level should be similar t=
o the levels already seen on the first oscillographs. but it can be lower a=
nd still work OK i.e. over the threshold to trigger the=C2=A0multiplex chip=
 normal=C2=A0TTL levels tolerance.</div><div><br></div><div>Good luck 73 pe=
tefmt=C2=A0</div><div><br></div><div><br></div></div><div class=3D"gmail_ex=
tra"><br><div class=3D"gmail_quote">On Fri, Jan 26, 2018 at 7:36 PM, Chris =
Wilson <span dir=3D"ltr">&lt;<a href=3D"mailto:dead.fets@gmail.com" target=
=3D"_blank">dead.fets@gmail.com</a>&gt;</span> wrote:<br><blockquote class=
=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padd=
ing-left:1ex"><br>
<br>
<br>
=C2=A0I just completed two scope measurements at R17 to pin 3 of the divide=
r<br>
=C2=A0IC. One of the faulty LF Softrock, and one on my MF one that works<br=
>
=C2=A0fine. the resultant wave forms are quite different. But I am not<br>
=C2=A0clever enough to say if they hold the clue, so will post them here.<b=
r>
=C2=A0Thanks again.<br>
<br>
Faulty LF oscillator or divider first<br>
<br>
<a href=3D"http://www.gatesgarth.com/R17-to-pin3.jpg" target=3D"_blank" rel=
=3D"noreferrer">http://www.gatesgarth.com/R17-<wbr>to-pin3.jpg</a><br>
<br>
<br>
Working MF Softrock, same place<br>
<br>
<a href=3D"http://www.gatesgarth.com/mf-R17-to-pin3.jpg" target=3D"_blank" =
rel=3D"noreferrer">http://www.gatesgarth.com/mf-<wbr>R17-to-pin3.jpg</a><br=
>
<div class=3D"HOEnZb"><div class=3D"h5"><br>
<br>
<br>
--<br>
Best regards,<br>
=C2=A0Chris=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 mailto:<a href=3D"mailto:dead.fets@gmail=
.com">dead.fets@gmail.com</a><br>
<br>
<br>
</div></div></blockquote></div><br></div>

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