Hello Roelof, LF
Thanks for this information, I will consider this option as my next step towards
better receive sensitivity for future tests.
BN73-202 should be possible to obtain here but how about the common mode choke
core material? One would need to acheive an XL of several kohms at such a low
frequency while still keeping the interwinding capacitance at a minimum.
BR
Paul-Henrik, OH1LSQ
Quoting Roelof Bakker <[email protected]>:
> Hello Paul-Henrik,
>
> I have build a special mini-whip for Michael Oexner, which uses CAT5
> network cable for RF and DC feed.
> It is equipped with an isolating transformer in the mini-whip and antenna
> interface plus common mode chokes in the DC feedline.
> The isolating transformers are obsolete MCL type TT1-6's, which have a
> lower roll off of 4 kHz.
>
> I had a limited supply of TT1-6's and have replaced them with a home made
> transformer wound on a Amidon BN-73-202 binocular core.
> As far I can see the frequency response is the same.
>
> Unfortunately I had to go out of town on Saturday and could not
> participate in the experiment.
>
> 73,
> Roelof, pa0rdt
>
>
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