Qfh Antenna Copper Tubing

So in my last post i was playing with my rtl sdr with an intel edison.

Qfh antenna copper tubing. Home oh2gvb electronics oh2gvb quadrifilar helical antennas simulation of qhas other qhas i ve built the quadrifilar helical antenna qha or qfh if you prefer has two defining properties. The original 10mm 3 8 inch version was tested in the loft. I already had copper pipe from a very old project to use for this antenna. The actual antenna portion of the pipe is going to be 560mm 22 tall but you will need to put a cap on the top of the pipe and also have some tubing protruding below the antenna portion for mounting.

Qfh introduction matching calculator. The qfh antenna consists of two types of loops in the design. In this video i build a qfa antenna from copper wire a bit of coax and a piece of drain pipe. My homemade qfh antenna make from 3 8 soft copper.

Then generate the template using this website. Aluminum is another possible choice for antenna construction. Here is the link i used to make my qfh antenna. The figure 1 depicts typical qfh antenna designed with larger loop and smaller loop.

Pvc pipe copper wires or thin tubing coaxial cable and bnc connectors are used in its construction. So i decided to build a qfh antenna to ble able to receive noaa apt signals. I arbitrarily picked 3 feet for total size. The default values for 137 5 mhz are good.

Step two is buying materials. Homemade qfh antenna made from copper tubing used for noaa weather satellite images. For this reason large copper wires will heat up significantly along their total length before the required joint is hot enough to properly flow the solder. Simulations dimensions groundplane pictures.

For the top of the antenna you are going to have to drill 4 holes at right angles to one another. I bought 1 and 0 75 pvc but if i was going to do this again i would probably buy 1 5 and 0 5. Of copper which needs to be fitted and soldered together. This helps in noise reduction and elimination of null spots.

These noaa weather satellites broadcast a apt signal with about 5 to 8 watts at 2m band and considering how low this power is it might suprise you that these signals arrive pretty strong at earth surface. Sounds pretty cool but that little antenna that came with your sdr isn t quite cutting it. Pictures of the copper tubing version. This proved to be false economy as just the 10mm elbows and tee cost more than all the the material for the 15mm 1 2 inch job.

This is a problem because copper has an extremely high heat conductivity. Another version of the quadrifilar helix. 1 its radiation pattern is just about as perfectly hemispherical as you will ever find 2 its radiation is just about as perfectly circularly polarized as you will ever find in all directions.