On Nov 30, 10:18 pm, Telamon
wrote:
In article
,





Harry7 wrote:
On Nov 28, 9:58 pm, N9NEO wrote:
I am wondering if a large ferrite rod would be good antenna for maybe
MW and 160meter band. Would there be an advantage to using a few rods
glued
together?

In the "ARRL Antenna Compendium, Vol. 6", there is an article
describing a tuned, ferrite rod, magnetic receiving loop antenna -
"The Optima 160/80-Meter Receive Antenna" by Richard Marris, G2BZQ.

THE author glues ferrite rods together exactly as you propose.

I never built or used one so I cannot comment on its perforance.

Gluing them together is a bad idea as you can not control the gap
between the rods. This small gap will ruin the inductance of the
combined rods and as a consequence the Q of this antenna.

--
Telamon
Ventura, California- Hide quoted text -

- Show quoted text -

Telemon,

The rod isn't a closed loop like a toroid so the the gap on the rod is
the distance from one face to the other. If we start with say a 7"
rod then what difference is .050" of glue going to make when we glue
to together to make a 14incher? I was thinking of maybe a series
parallel combination of a dozen or so.

regards,
NEO