|
Maybe he'd have better luck mounting the antenna in the vertical
stabilizer. If the ground plane is connected to the frame, your VSWR
should give you a good reading on whether or not you're in business.
Phil wrote:
> Hello
> A young friend of mine is in the process of restoring an EAA Biplane ,
> last weekend we started working on his new engine mount , he started to
> discuss the fact that he is installing his VHF Com. antenna inside the
> fuselage , this experimental is the older tube and fabric design , cockpit
> is about 24 in. wide and narrows to the tailpost , being an old HAM radio
> operator , a lot of red flags went up , he want's to mount a standard 1/4
> wave vertical somewhere aft of the cockpit area , width in the proposed spot
> would be about 14 in. , all of my experience with radiating elements says
> that it will not work , I think the element will try to couple with the tube
> structure , SWR will go sky high and it will be a no go , I'll bring an
> MFJ 259 to the airport next weekend and try to give him a graphic demo. of
> my perceived doubts .
> I know that the guys with the glass and wood are doing OK with there
> internal Ants. , wondering if someone else has had any luck with getting RF
> to exit a 4130 airframe , he wants it to use in the standard 118- 136
> portion on the band , plane has an alum. turtledeck , I told him that the
> deck should make a good gnd. plane for the 1/4 wave vert. , he is concerned
> about aesthetics , any thoughts would be appreciated .
> Thanks
> Phil
> W8KLK
|
|
Re: VHF Com. Ant. for Biplane
