Wave Trap

[Dave.H]

I have an old tube regenerative radio, but where I live, there's a
powerful radio station that overpowers the other weaker stations, I
want to build I wave trap, already have a 2 gang variable capacitor
sitting around, unknown value, that maybe I could use. Is there any
way I can measure this using the capacitance feature on my
multimeter? What size coil wire would I need?

Thanks, Dave

 

[Tom Biasi]

"Dave.H" <the1930s@googlemail.com> wrote in message
news:195d3955-67bf-44cc-8afe-f0e014f9f523@s8g2000prg.googlegroups.com...

I have an old tube regenerative radio, but where I live, there's a
powerful radio station that overpowers the other weaker stations, I
want to build I wave trap, already have a 2 gang variable capacitor
sitting around, unknown value, that maybe I could use. Is there any
way I can measure this using the capacitance feature on my
multimeter? What size coil wire would I need?

Thanks, Dave

Hi Dave,

You certainly could measure it with your capacitance meter.
The coil that you would need would depend on the frequency.
You could look into "LC Resonant circuits"

However, it is unlikely that you can achieve the desired result this way.
The regen circuit is very sensitive and high gain across the entire band.
To trap a powerful signal with just one LC circuit is not likely.

Tom

 

[Dave.H]

On Mar 31, 3:59 am, "Tom Biasi" <tombi...@optonline.net> wrote:

"Dave.H" <the19...@googlemail.com> wrote in message

news:195d3955-67bf-44cc-8afe-f0e014f9f523@s8g2000prg.googlegroups.com...

I have an old tube regenerative radio, but where I live, there's a
powerful radio station that overpowers the other weaker stations, I
want to build I wave trap, already have a 2 gang variable capacitor
sitting around, unknown value, that maybe I could use. Is there any
way I can measure this using the capacitance feature on my
multimeter? What size coil wire would I need?

Thanks, Dave

Hi Dave,

You certainly could measure it with your capacitance meter.
The coil that you would need would depend on the frequency.
You could look into "LC Resonant circuits"

However, it is unlikely that you can achieve the desired result this way.
The regen circuit is very sensitive and high gain across the entire band.
To trap a powerful signal with just one LC circuit is not likely.

Tom

The frequency of the overpowering radio station is 1431 kHz (we have 9
kHz spacing in Australia), found a wave trap kit at Antique Electronic
Supply I might try, Cat # K-934