Hi ab cd,
Strangely my actual spider antenna builds for Phillip did not in part agree with the theory ( nothing new there !)
I started in the conventional way by first cutting the radials and the centre driven element to 1/4 lambda (69mm) 69.5mm actual then put the unit in test.
Then I started...
Very useful post ab cd,
Such a popular antenna this one, a good performer and very easy to make.
Interesting as I constructed 2 antennas recently for another Planefinder member Phillip Robinson.
The thread is here
Hi chris VE3ZO, I eventually got things working again by using network config localhost beast port :30005.
I was using loopback 127.0.0.1:30005 which is the prefered way but when i did, my 30053 screen view had no aircraft, just a map.
Hope this helps,
Just a quickie, rebooted and now feeder running 3.3.222 but no data being processed, map view blank, tried setting pi to avr tcp to loopback 127.0.0.1 and 30005, still no joy so far.
Edit , got it working again on localhost :30053 but web view very slow to load on occasions or wont load at all...
Well done on the mast and fanklin, looks good..
Do you have Rhomboid antenna for VHF shown also in the photo
Looks like you enjoy experimenting;)
Franklin has good gain but is also directional.
With traffic being diverted , why not try a standard 1/4 wave spider antenna with low...
Welcome, nice mast setup there.;)
I would presume that the difference in lengths are down to the different connector interfaces used to construct a given antenna.
For example, my humble spider (photo attached) required trimming from the rough 69mm to around 64/65mm for optimum on my site...
I feel your pain Oz.
Another "Crow Experience" further back in this thread..a bit of action over my garden from "Grimreaper" and "Spadger".
There is a population of crows about 200 yards away in some large trees, they have been there for as long as I can remember.
When there is an altercation...
Nice work there with the smaller stuff ab cd, now for the real deal on 7/8 inch.
I think Andrews Heliax went up to 1 and 5/8 diameter with LDF coaxial .
Telephone number money for a 225 mtr drum delivered on a rather large truck.
Velocity Factor, each coaxial has a velocity factor, this should be taken into account when cutting coco the elements to length.
The VF value usually features in antenna element calculators.
In this case though, the intention is to change the makeup of the cable by stripping the braid...
Hi ab cd ,
Yeah , robust cable indeed.
The LDF5-xx series is bigger again,a 7/8 inch diameter,not for the faint of heart or light of wallet !
I would love to see xforce trying to bend that 90 degrees back on itself like he does with his wire tricks, I bet he could do it too !;)
Watch out on the VF with brass tubing on a stripped 50 ohm LMR400 guys,
You could treat yourself and try to make a coco with the mother of coaxials, Andrews Heliax LDF5-75 (a 75 ohm cable for a 75 ohm job),if you can get it..the 50 ohm (LDF5-50) is more popular.
No faffing with tubing as its...
@jepolch , Send a quick email over to Davis RF stating your dielectric diameter size requirements of 0.22 inches (5.8mm), they will have a coax cable for you and they sell by the foot so it wont cost the earth.
They are main agents for Times Microwave, Andrews etc.
Superb service from Davis,I...