Thanks for the coax info. The 174 I
have is small enough for the job, although I'll get some of the
178. However, my real question was about how to change the code to
change which Si5351 output I use.
Also, looking for how to enable the raduino BFO.
Thanks!
On 4/8/2017 3:32 PM, Jerry Gaffke via Groups.Io wrote:
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We are using coax to shield the critical signals, not so much
as transmission line. ?The coax shield on both ends should be
tied to a suitable ground. ?If used on the volume pot (I have no
idea if that will help in your particular situation), you
probably need two pieces of coax because there are two critical
signals.
According to this webpage, RG-174 is 2.55mm in diameter, RG-178
is is the smallest listed at 1.8mm: ??
? The RG series spec was last updated in 1962. ?I have some nice
flexible 1.5mm coax on hand, no identifying marks and no idea
what it might be called.
If you don't want to mess with coax, twisted pairs are a good
second best. ?Just twisting the wire provided by hfsigs will
help, but better to use smaller diameter wire as that allows the
wires to be closer together. ?Twist a ground wire with the
critical signal wire, perhaps one or two turns per inch. ?In the
case of the volume pot, could just twist all three wires
together since we don't care if the two signal wires interact.
On Sat, Apr 8, 2017 at 12:45 pm, Jerry Gaffke wrote:
?The impedance (50 or 75 ohms) should not matter much
?
