koyo-denki: Telescopic Aerial
ID: 645053
This article refers to the model: KTR-1661 (Koyo Denki Co. Ltd.; Kodaira, Tokyo)
koyo-denki: Telescopic Aerial
31.Dec.23 14:17
0
The aerial is the kind with a knuckle-hinge at the base.
7 sections
7 sections
About 13.5cm collapsed, measured to hinge screw.
About 71.5 cm above top of radio straight, or about 69 cm if angled, on long portion.
Obviously about optimal for 100 MHz, as any 1/4 wave aerial is electrically a little longer than physical length.
Really any aerial that fits inside case when collapsed should be fine. The inside of the case is about 22cm and has a fixed bottom section, with wire to base, so total length is about 96cm straight up, but electrical length shorter due to wire from base to PCB.
About 71.5 cm above top of radio straight, or about 69 cm if angled, on long portion.
Obviously about optimal for 100 MHz, as any 1/4 wave aerial is electrically a little longer than physical length.
Really any aerial that fits inside case when collapsed should be fine. The inside of the case is about 22cm and has a fixed bottom section, with wire to base, so total length is about 96cm straight up, but electrical length shorter due to wire from base to PCB.
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koyo-denki: Possible KTR-1661 schematic
31.Dec.23 14:21
This model may be the same or a very similar schematic.
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