Mike
If the ferrite rod was the drain load what was on the gate?
73s
Roger G3XBM
Via my iPod Touch 4g 2.4GHz handheld.
On 12 Sep 2011, at 13:36, "Mike Dennison" <[email protected]> wrote:
> I have been following the discussion on ferrite receiving antennas -
> due to work pressures I am a few weeks behind in reading the mail.
>
> The use of this type of antenna for LF amateur radio is not new. I
> used it successfully as a portable antenna on the old 73kHz band
> several years ago.
>
> I used the existing winding (LItz) an ordinary long-wave broadcast
> radio antenna. The rod was about 150mm long. The coil, tuned with a
> large fixed C and a variable C, formed the drain load of a 2N3819,
> with the output taken from the source. The selectivity was very high
> indeed (essential to reduce the huge commercial signal on the 73kHz
> band) and sensitivity was adequate to overcome the noise level of my
> very sensitive Datong LF converter.
>
> The interesting thing was that Peter, G3LDO, tried to replicate this
> and had poorer results, perhaps indicating that not all long wave
> radios had ferrite that worked at 73kHz.
>
> Mike, G3XDV
> ==========
>
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