I've got a radio in me pedal

[bbl4ck]

So, I have been trying out this new OD pedal which is a Mojo Hand Rook.  It really has a broad range of sounds and versatility and I am diggin' it just fine. 
The problem is that the darn thing picks up a local radio station every time I turn it on.  It is definitely the pedal as the radio turns on when I turn on the pedal and the radio turns off when I turn off the pedal.
It does the same thing when I use it with either of my Fender amps, my Marshall, or my Roland.  I have a dozen other various pedals and none of them pick up the radio.
I really like the pedal and you can't hear the radio when I am playing.  However, the radio during the dead moments just drive me nuts. 
Anybody have any fixes for such an issue?  I am really hoping I can eliminate the radio because otherwise I will be forced to eliminate the pedal. 
Thoughts???
:rock-on:

 

[bagman67]

I'm eager to hear what our local electrical engineers have to say about this one.  Seems like some sort of shielding cage would be necessary, but I lack the real underlying knowledge to suggest how that might be done.

 

[mayfly]

sounds like it needs an RF filter on the front end.  It's picking up the carrier frequency and detecting it.

A typical tube amp does this using a grid resistor, which works because it interacts with the grid capacitance of the first stage input tube.  Your pedal needs an equivalent circuit.

 

[swarfrat]

Eric Johnson will cry if you modify the circuit in any way to avoid picking up the radio station. Pure vintage tone hums because it has something to sing along to.

Seriously, most of the fixes involve modification, but you could try some ferrite beads.

 

[bbl4ck]

sounds like it needs an RF filter on the front end. 

Electronics are definitely not my strength, but from what I read, an RF filter cuts out frequencies above or below a determined frequencies.  Wouldn't this have the possibility of significantly changing the sound of the pedal?  :dontknow:

 

[bbl4ck]

Seriously, most of the fixes involve modification, but you could try some ferrite beads.

Can you tell me more about what and/or how the ferrite beads would help and would it affect the sound of the pedal?  :dontknow:

 

[mayfly]

sounds like it needs an RF filter on the front end. 

Electronics are definitely not my strength, but from what I read, an RF filter cuts out frequencies above or below a determined frequencies.  Wouldn't this have the possibility of significantly changing the sound of the pedal?  :dontknow:

Nope.  The idea is to filter out frequencies in the RF range.  It's quite easy to design a first order filter to do that and leave the passband very much alone.

 

[bbl4ck]

sounds like it needs an RF filter on the front end. 

Electronics are definitely not my strength, but from what I read, an RF filter cuts out frequencies above or below a determined frequencies.  Wouldn't this have the possibility of significantly changing the sound of the pedal?  :dontknow:

Nope.  The idea is to filter out frequencies in the RF range.  It's quite easy to design a first order filter to do that and leave the passband very much alone.

Thanks greatly for your time and expertise Trevor, but I am afraid your knowledge base of electronics far, far exceeds mine.  Is this something that I can purchase, and if so, what do I look for.  Alternately, should I just take it to my local amp tech for such a filter?  Thanks again...
:rock-on: