Message text written by INTERNET:forum@europaclub.org.uk
>A word of caution. I fitted a dipole aerial in the fin and tuned it with a
VSWR meter to give the strongest signal in the mid-range. I subsequently
fitted a strobe at the top of the fin. Recently I have found that ground
stations with mid-range frequencies have had difficulty in receiving my
transmissions. I checked the aerial again only to find that the mid-range
was by far the worst sector. Ferg has been advising me and says that this
could be some sort of harmonic effect, and that a dipole is very sensitive
to any metal alongside the aerial. Rather than re-site the strobe I am
currently fitting a quarter wave aerial inside the fuselage, mounted on the
upper surface and facing downwards. I have fitted a 6mm radius copper disc
at the base of the aerial to act as a ground plane, but if this is not
satisfactory I intend attaching two or three strands of co-ax sheath about
22" long to the inside of the fuselage. Work in progress!<
Which make of strobe are you using? I know that some makes cause more
interference than others and it would help to improve the data on this.
Nigel Charles
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