29/2 2012,   I have now inserted an Amidon ferrite toroid FT-240-61 on all 4 cables
to/from the gas burner (with 14 turns) and I'm very satisfied.
If I should reduce the noise today I would use FT-240-43 or Fair-rite 2631803802 (FT-240-31)
for better noise reduction.

Noise on power cable

Noise on outdoor feeler cable

4 noise ferrites beneath the gas burner

25/1 2012,   Once again noise on HF-bands and this is radiated from my new gas burner :o(

A Vaillant ecoTEC exclusiv VC 146/4 (Don't buy it)

Measurement on power and outdoor feeler cable shows substantial noise on both cables


Noise on the outside sensor cable near the gas burner

Noise on the outside sensor cable near the sensor

Noise on outside sensor cable with a noise filter on the power cable.

Noise on power cable with a noise filter inserted

Noise on power cable with a noise filter inserted and a cable clamp on on outdoor feeler cable

Noise on outdoor feeler cable with a couple Cable Clamp ons på feeler, power and hot water pump cables

Noise on power cable with a couple Cable Clamp ons på feeler, power and hot water pump cables

I think it's necessary with a good power filter and a filter on the outdoor feeler.
The outdoor feeler feed the burner with time pulses from a DCF-77 receiver.
I suspect the built-in power supply is rather noisy!!!

Opdateret d. 29.6.2014/OZ1DB