Hi Ian,
When the range of a current tranformer should be increased from 1A to
10A, the best way is to increase the number of turns of the secondary
winding by a factor 10. This transforms the current down by a factor 10
(not up) in the secondary winding...
I*N has the same value on both sides (ideally/theoretically).
73, Stefan
> Hello Allan
>
> I assume the 10A mod is a matter of increasing the series R with
the
> meter to around 800k?
>
> I suppose a 3way switch and extra trim pot could be added to
preserve
> the 1A range too.
>
> Thanks for the note re-shipping Monday.
>
> Look forward to getting the Kit.
>
> 73
>
> Ian G4GIR
>
> -----Original Message----- From: Alan Melia
> Sent: Friday, August 4, 2017 9:36 PM
> Subject: LF: RE:G4HUP aerial current meter
>
> It has just occured to me that the 1A range may not be high enough
for
> some
> of the LF QRO merchants. There is a simple mod which will extend
the
> range
> up to 10A though you should be aware the ferrite core has not been
> tested at
> this level of RF. These cores are used on mains leads carrying up
to
> 13A so
> I think they will be OK.
>
> Thank you to those showing interest, there are a few kits still
> available.
>
> Alan
> G3NYK
>
>
