Page 3 of 12 FirstFirst 12345 ... LastLast
Results 21 to 30 of 111

Thread: Virevent & Turbine advanced CP antennas tutorial.

  1. #21
    Hi Hugo great tutorial thanks for posting this awesome job!

    Do you think that theres some issue if one just try to build this design with UT141 (im on 5.8GHz) and just keep the center conductor as "D"?

    I found some issues while tuning but apart from this there is something else that may shouldnt work using semi-rigid coax?

    Thanks in advance!

    Martin

  2. #22
    Shedding light over FPV HugeOne's Avatar
    Join Date
    Mar 2011
    Location
    Canada, Quebec
    Posts
    955
    I don't see any problem apart that the bigger center conductor will shift frequency up a bit.

    -Hugo

  3. #23
    Thanks for your reply Hugo.

    Martin

  4. #24
    Read my mind... FPV ! ecampos's Avatar
    Join Date
    Apr 2011
    Location
    Quebec, CANADA
    Posts
    13
    Here are some pics of my first build of this antenna including also pics of some steps of the building process. It's actually a lot easier to build precisely and get good SWR than a cloverleaf/SPW; i got around 1:25 - 1:3 SWR, not bad for a first build ! My question is, what is the maximum effective gain for it ? Also, i would like to build a turbine, but i can't find the base wires angles... Thanks
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	100_0331.jpg 
Views:	414 
Size:	97.3 KB 
ID:	8307   Click image for larger version. 

Name:	100_0342.jpg 
Views:	413 
Size:	89.2 KB 
ID:	8308   Click image for larger version. 

Name:	100_0335.jpg 
Views:	346 
Size:	87.7 KB 
ID:	8309   Click image for larger version. 

Name:	100_0338.jpg 
Views:	343 
Size:	92.8 KB 
ID:	8310   Click image for larger version. 

Name:	100_0349.jpg 
Views:	400 
Size:	85.5 KB 
ID:	8311   Click image for larger version. 

Name:	100_0357.jpg 
Views:	363 
Size:	90.0 KB 
ID:	8312   Click image for larger version. 

Name:	100_0361.jpg 
Views:	358 
Size:	88.3 KB 
ID:	8313   Click image for larger version. 

Name:	100_0370.jpg 
Views:	362 
Size:	85.8 KB 
ID:	8314   Click image for larger version. 

Name:	100_0376.jpg 
Views:	359 
Size:	86.8 KB 
ID:	8315   Click image for larger version. 

Name:	100_0387.jpg 
Views:	457 
Size:	83.0 KB 
ID:	8316  

    Click image for larger version. 

Name:	100_0404.jpg 
Views:	385 
Size:	87.9 KB 
ID:	8317   Click image for larger version. 

Name:	100_0414.jpg 
Views:	459 
Size:	90.1 KB 
ID:	8318   Click image for larger version. 

Name:	100_0418.jpg 
Views:	469 
Size:	91.6 KB 
ID:	8319  
    Last edited by ecampos; 27th March 2012 at 07:24 AM.

  5. #25
    Shedding light over FPV HugeOne's Avatar
    Join Date
    Mar 2011
    Location
    Canada, Quebec
    Posts
    955
    Nice built ecampos, turbine angle is 45deg. Gain is in the approx 1.2db.

    -Hugo

  6. #26
    could quit if I wanted to volto's Avatar
    Join Date
    Mar 2011
    Location
    Durango, CO
    Posts
    3,095
    Quote Originally Posted by ecampos View Post
    Here are some pics of my first build of this antenna including also pics of some steps of the building process. It's actually a lot easier to build precisely and get good SWR than a cloverleaf/SPW; i got around 1:25 - 1:3 SWR, not bad for a first build ! My question is, what is the maximum effective gain for it ? Also, i would like to build a turbine, but i can't find the base wires angles... Thanks
    Nice build, but with that level of precision, how would you possibly get worse SWR with a cloverleaf?
    Don't steal, the government hates competition.

  7. #27
    Read my mind... FPV ! ecampos's Avatar
    Join Date
    Apr 2011
    Location
    Quebec, CANADA
    Posts
    13
    Quote Originally Posted by volto View Post
    Nice build, but with that level of precision, how would you possibly get worse SWR with a cloverleaf?
    Humm... don't know exactly... Maybe i have some difficulties building that round side of cloverleaf/SPW's lobes. I prefer playing with straigth wires I'll give another try on the cloverleaf tonight...

  8. #28
    Read my mind... FPV ! ecampos's Avatar
    Join Date
    Apr 2011
    Location
    Quebec, CANADA
    Posts
    13
    So, just built my own turbine (1280mhz) and got almost 1.1 SWR !! Thanx again Hugo for this great design I'm hopping if you have the dimensions table for a Windmill using the old build method ? (the one from the virevent/turbine tutorial pdf on the first post of this thread, not the one using a single wire for each leg). Here's some pics of the building process:


  9. #29
    could quit if I wanted to volto's Avatar
    Join Date
    Mar 2011
    Location
    Durango, CO
    Posts
    3,095
    My mind is blown at how strait you get those wires. How in the hell do you get them that strait? Nice work.
    Don't steal, the government hates competition.

  10. #30
    Read my mind... FPV ! ecampos's Avatar
    Join Date
    Apr 2011
    Location
    Quebec, CANADA
    Posts
    13
    Simple, twist them ! Here's my method: I attach one side of a wire to a vice and the other to a low speed drill and i twist the wire while gently pulling the drill towards me (do not apply to much power, as it will thin the wire) After a couple of turns, the wire gets straight... Then, while maintaining the tension on the wire, just cut it and you get a perfectly straight antenna wire ready to get cut and trimmed

    Quote Originally Posted by volto View Post
    My mind is blown at how strait you get those wires. How in the hell do you get them that strait? Nice work.

Similar Threads

  1. Turnstile UHF RX antenna tutorial
    By IBCrazy in forum Video Aerial Systems
    Replies: 444
    Last Post: 11th January 2019, 07:23 AM
  2. 70KM ANTENNA !!!!! ;)
    By sircana in forum Circular Wireless
    Replies: 187
    Last Post: 26th October 2012, 03:21 AM
  3. Replies: 2
    Last Post: 26th December 2011, 12:20 PM
  4. My first two antennas ever
    By MASHTON1138 in forum Video Aerial Systems
    Replies: 4
    Last Post: 1st November 2011, 12:48 PM
  5. Inner workings of a model turbine
    By mike20sm in forum OFF-TOPIC
    Replies: 1
    Last Post: 31st August 2011, 07:18 AM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •