RE: LF: Strange signal 500khz

["Gary - G4WGT" <g4wgt@tiscali.co.uk>]



Hi Alan, Markus & LF,

 

Here is an interesting result,

 

I wrote :-

 " I believe that the stepping effect is probably due to the "Freeview" digi-box because the TV is an older analogue model & I would expect a steady (ish) interference with no prominent stepping. I will do some tests with & without the digi-box. "

 

After watching the mid-day news today whilst monitoring 500KHz using SpecLab I switched off the digi-box & the stepped interfering line stopped, I then switched the digi-box back on & the line returned as I expected, now I switched the TV off leaving the digi-box on & the line stopped again. So it is not generated solely by the digi-box but a combination of both the TV & the digi-box being on.

 

Comments invited.

 

Regards,

 

Gary - G4WGT.