[TowerTalk] AC operated relays for ant switching

[alsopb]

Good advice.  However, I'd also recommend trying them first on a lower
voltage.  If you have a variable voltage supply, try from 12 to 24
volts. Also measure the coil resistance and figure out how much current
they draw.  Verify that your supply can switch multiple relays -- if
that's what your switching application requires several to be operated
simultaneously. I've used 110v ac relays for years with 24V DC and they
work fine.  No hum either.  

73 de Brian/K3KO

dan hearn wrote:
> 
> I have a home built ant sw using relays w 110 a.c. coils. They work fine and do
> not overheat with 24 v.d.c. on the coils. This, of course is much safer than
> using the 110 a.c. I use  a back connected diode across each coil to keep the
> inductive h.v. spike on disconnect from damaging the selector sw. Haven't found
> bypassing necessary if the diodes are slow speed power types like 1N4001
> series. Good Luck, Dan, N5AR
> 
> zeitler@ibm.net wrote:
> 
> > Gents,
> > I have some ceramic insulated DPDT relays that I would like to use for
> > remote antenna switching. They have 120vac coils. Will this be a problem RF
> > wise? Any interference? Any precautions? Bypassing?
> >
> > Comments welcomed.
> >
> > Lane Zeitler
> > Ku7i
> >
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