TopBand: 160m Beverage transformer core material?

[km1h @ juno.com]

>This has been covered before, but let me briefly repeat some 
>important points.
>
>What you want is a core material with an ui (permeability) that 
>has the highest possible value on 160, and gradually decreases 
>at higher frequencies. That insures the transformer has the highest 
>possible winding impedances with the least amount of turns. 



Hi Tom, I know we have been thru this before a year + ago and we agreed
on most...sounds like a new audience!

I prefer to have a Beverage be useful at least thru 20M and have selected
the FT114-61 core with 16T quadrifilar as the best compromise here. On
160M thru 20M  I find no requirement for a preamp and find the Beverages
quite a benefit on the higher bands during periods of percipation static.

Note I said compromise and not peaking on 160M.
I also 110% agree about staying away from those dummy load cores in the
Beverage books, etc. Also stay away from any so called xfmr/preamp using
SMD devices.....just a hint of RF and they are into IMD big time.

73  Carl   KM1H

 

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