In article . com,
kg0wx wrote:

Can a Heath GD-1B be safely powered from a DC/AC power
inverter? I know the output of most inverters is a bit "dirty" so
I don't want to do it if it will harm my GD-1B.

I rather doubt that doing so would cause damage, as the power supply
is transformer-coupled.

I'd be more concerned about incorrect or flaky operation. The GD-1B
doesn't appear to have particularly good RF/EMI filtering on its AC
supply... there's just a single-stage R/C on the high-voltage DC and
none on the filament. A stepped-square-wave inverter would probably
end up dumping a lot of HF hash into the circuit. This might cause
the oscillator/detector to misbehave in any number of ways - the meter
might jump around a lot as you tune, or the oscillator frequency might
"pull" to the frequency of one of the inverter harmonics anytime you
got near it, etc.

You might be able to improve matters by installing a hefty,
high-attenuation RFI/EMI filter (such as the sealed-in-metal modules
sold by Corcom and others) in between the inverter and the GD-1B.
Adding some EMI filter components inside the GD-1B might also help...
ferrite beads on the mains wires, some .01 uF - .1 uF mains-rated
filter capacitors across the primary and secondary transformer
windings, etc.

--
Dave Platt AE6EO
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