"Jim Lesurf" wrote in message
...
In article , Iain Churches
wrote:

[big snip]

Jim. The specification comes straight from an EBU manual. Serge was able
to describe the device more lucidly than I, without having to refer to
the broadcast handbook. The inductance, is a design value in the spec.
"80H or better" My units are were slightly less.

OK, thanks.

I was curious about this as result of the strange claims made by 'Silk'
comparing the transformer attenuator with a simple potential divider. So
far as I can see, both types can be expected to have a setting-dependent
bandwidth, despite the implication of what Silk have been quoted as
saying.
Hence it seems odd for them to give this as a reason for all the extra
cost
and complications.

This then prompted me to wonder about the uncoupled inductances, parasitic
capacitances, etc, that would allow someone to estimate the actual
bandwidth in use of the transformers. Since you quoted the 80H I wondered
if you knew the other relevant values for your transformer...

Slainte,

Jim

The reponse is 10Hz to 100kHz +/- 0.5dB at all settings.
THD is 0.05% driving at +18dBu 50Hz.

Iain

In article , Iain Churches
wrote:

"Jim Lesurf" wrote in message
...


This then prompted me to wonder about the uncoupled inductances,
parasitic capacitances, etc, that would allow someone to estimate the
actual bandwidth in use of the transformers. Since you quoted the 80H
I wondered if you knew the other relevant values for your
transformer...


The reponse is 10Hz to 100kHz +/- 0.5dB at all settings. THD is 0.05%
driving at +18dBu 50Hz.

With what assumed/.chosen source, load, and cable impedances? e.g. does it
assume a 600 Ohm source, a 10k load, and ignore cable capacitances?

I assume you mean "not less than" for the values you quote, since the real
values could be expected to vary with the tapping. (?)

The 'Silk' transformer data seems to say nothing about parasitic
capacitances, etc. Not about the winding resistances. Since they claim a
very high inductance and imply they use many turns of tiny wires, I wonder
what the levels of these parasitics might be.

Slainte,

Jim

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