On 5/12/2013 1:37 PM, Jeff Stevens wrote:
Has anyone had success specifying a term such as 'RFI Free' when
dealing with a contractor? Whenever there is AC (or worse yet, square
waves) there is going to be SOME level of RFI, no? The question
becomes what level is acceptable for a particular installation. In my
case, if it's VLF/ELF noise or HF noise below the noise floor on
antennas some distance away, I don't really care. I can't, however,
provide a more specific acceptable level such as a particular maximum
field strength. Something like 'RFI Free' seems rather amorphous and
if I were a contractor, I'd be reluctant to accept such a term.
However, if my customer provided concrete criteria (such as a maximum
field strength) I might actually be able to get some specs from the
manufacturer and have some reasonable confidence that I can perform
the install in such a way as to meet my customer's needs.
Just curious if anyone has brought RFI issues up, in writing, with a
contractor and how that worked out.
When I was looking at installing a geothermal unit there was not one
contractor who would agree verbally let alone in writing. I was under
the impression most didn't even understand what pulse width modulation
meant or how the motors we actually controlled. Even those that would
listen didn't appear to understand how it could interfere with a radio
because it was on a wire.
Our house is well insulated and the only thing I'd change beside making
it 50 - 100% larger would be to increase the pitch of the roof
substantially. It turned out that the latest geothermal system would
have a payback of 47 years compared to our old, high efficiency system
that is ready for replacement. 47 years is about twice the life
expectancy of the installation.
They all had to see our gas and electric bills before they'd believe our
heating and cooling costs. To a contractor they all agreed that
geothermal was not worth the investment for us after working months to
get us to consider it.
73
Roger (K8RI)
-Jeff
W7WWA
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