Hi David,
probably they use a bus system on an unshielded cable. My heating
system is similar. Although it does not generate QRM sometimes the
heating "stalls" after transmitting on HF and you have to power it
down to reset it :(
If you can, you might want to try shielded cable to avoid radiation
from the cable itself.
73
Christian, DL6KAC
On 11/19/06, David Robbins K1TTT <k1ttt@arrl.net> wrote:
> Argh... this should have been safe, I thought. Friday I had a Rinnai
> tankless hot water heater installed, now I have pulsing qrm on several sw
> bands. They seem to have nicely avoided the 6 hf contest bands at least.
> Anyone know what these are doing? The manual doesn't say a thing about how
> they are controlled other than to hook up the 2 wire cable from the remote
> controller to the heater.
>
>
> David Robbins K1TTT
> e-mail: mailto:k1ttt@arrl.net
> web: http://www.k1ttt.net
> AR-Cluster node: 145.69MHz or telnet://dxc.k1ttt.net
>
>
>
> _______________________________________________
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> RFI@contesting.com
> http://lists.contesting.com/mailman/listinfo/rfi
>
>
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