The plate can be almost any size. It can be round, square or rectangular as fits the available space, but should be large enough that the radiated energy will be reflected off the plate and not enter the cockpit. Imagine a light bulb in place of the antenna, and making a shield to stop the light from entering the cockpit. That is exactly what the energy from the antenna would look like if you could see it.
The thickness can be anything capable of resisting an accidental bump and high speed air movement. The antenna mounting (attachment) must be firmly in contact with the plate for an effective electrical ground and mechanical connection. Some people will say that the plate should be some exact diameter, ( ~ twice the length of the transponder antenna). That is true, to obtain the best antenna radiation pattern - but in real life not at all required since other things on the aircraft will influence the the radiated signal pattern. Consider a transponder antenna mounted under an aluminum aircraft: the metal airframe acts as the ground plane, and none are of an ideal dimension or an ideal shape,*/but they all function well./* If it were my airplane, I would use .025" (+ or -) since the wood below is thin, approximately 24" round or square, firmly attached to the floor. If you epoxy the plate to the floor, the thickness could be less. This is one person's opinion, based on having made many ground plane antennas in years past, both fixed and mobile. You are free to accept or reject any of the above information and suggestions. Best wishes, and good flying. George ------------------------------------------------------------------------ On 5/12/2015 11:28 PM, stefkr2--- via KRnet wrote: > Kr friend, > I want to install a xpdr antenne, I have learned to install this antenne > under the Seat because of the high transmission power. I have learned to that > I can buy a alluminium plate to make a grounding plate And to shielded off > your BU..... Does somebody know what are the dimensions And thickness of that > round alluminium plate? This should be easy to make it your self. > Thanks Stef > > -- > Steph and his dad are building the KR-2S see > http://www.masttotaalconcept.nl/kr2 > > > > > _______________________________________________ > Search the KRnet Archives at http://tugantek.com/archmailv2-kr/search. > To UNsubscribe from KRnet, send a message to KRnet-leave at list.krnet.org > please see other KRnet info at http://www.krnet.org/info.html > see http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to change > options --- This email has been checked for viruses by Avast antivirus software. http://www.avast.com
