|
|
Post by homerbb on Apr 16, 2010 8:48:35 GMT -5
04/14/2010Put this together over the last couple of days. Now I need conditions to try it out. Current SWR: 1.5:1 on ch 40 1.3:1 on ch 19 1.2:1 on ch 1 Put a gamma match on it. I am only 26' up right now, and only 8' above the roof line. I have more work to do on the mast to get it where i want it. We'll have to see what happens next.  04/15/2010I pushed it up a couple feet higher, and mounted the old A99 above it: 
|
|
|
|
Post by Phantom309 on May 11, 2010 20:49:33 GMT -5
I just took down my M103 took it apart and turned it into a 4 element beam. I used copper for the extra element and bought the appropriate pipe for the boom. I didnt even move the gamma match from before when it was a 3 elemtn and I got a match of something like this
ch 1 - 1.5
ch 20- 1.3
ch 40- 1.2
ch 80- 1.1
I was pretty impressed with that and thought I better leave well enough alone. It was harder to tune my 3 element maco than this homemade 4 elemt. What a difference I find in recieve as well as cutting down unwanted intereference.
I tried to upload my pic of my tower but I am having trouble figuring it out. any suggestions?
|
|
|
|
Post by cbrown on May 12, 2010 9:32:42 GMT -5
I just took down my M103 took it apart and turned it into a 4 element beam. I used copper for the extra element and bought the appropriate pipe for the boom. Be careful. Aluminium and copper are dissimilar metals, so you can get galvanic corrosion in the presence of an electrolyte, and these connections can become unstable over time. |
|
|
|
Post by homerbb on May 12, 2010 22:11:00 GMT -5
I just took down my M103 took it apart and turned it into a 4 element beam. I used copper for the extra element and bought the appropriate pipe for the boom. I didnt even move the gamma match from before when it was a 3 elemtn and I got a match of something like this ch 1 - 1.5 ch 20- 1.3 ch 40- 1.2 ch 80- 1.1 I was pretty impressed with that and thought I better leave well enough alone. It was harder to tune my 3 element maco than this homemade 4 elemt. What a difference I find in recieve as well as cutting down unwanted intereference. I tried to upload my pic of my tower but I am having trouble figuring it out. any suggestions? Great job on the antenna remodel. I'm impressed, too. I've considered doing the same with mine, but I have neither the tower nor beefy enough rotor for a 4 element. I don't know much about how the copper and aluminum will interact, but the change seems to be doing you a fine job. As for uploading photos, the only success I've had is to post them elsewhere on the web and link to them here by using the image button above with the web location in between. Try that if you can. |
|
|
|
Post by homerbb on Oct 14, 2010 19:06:15 GMT -5
|
|
Sandbagger
Administrator/The Boss 
Posts: 6,250 
|
Post by Sandbagger on Oct 15, 2010 6:07:52 GMT -5
I've stayed busy scratching my homebrew itch. Here are some things I've done since the 3el Yagi: Nice looking antennas. I'm sure you've found out that there is no "one size beats all" antenna. Each has certain traits which allow it to work better in one circumstance, over a different antenna. But it's a lot of fun experimenting. I just wish I had the time and the real estate to play with antennas. They are very interesting, and the most important part of your station. |
|
|
|
Post by homerbb on Oct 15, 2010 9:33:59 GMT -5
I got tired of climbing up and down on the roof, esp with the wife fussing about it. I built the tip over tower because I like to make different antennas and with it I can swap out an antenna in mere minutes.
You're right. The different models exhibit different characteristics. I was pleasantly surprised by the 1/4 wave GP. And the silly chicken wire antenna tuned out and talked better than I thought it would, and did better sitting on a concrete parking lot than it did on my wooden deck.
The jury is still out on the Qv4k v the horizontal GP 5/8 wave vertical. I am trying to run them both over a two to three week period so as to get a diverse set of conditions for both. Right now I'm liking the 5/8 better.
|
|
|
|
Post by cbrown on Oct 15, 2010 10:14:32 GMT -5
Antenna design is one of the best parts of this hobby.  |
|
|
|
Post by bootymonster on Oct 15, 2010 10:53:08 GMT -5
that's quite a collection of nice looking antennas ....... and home-brewed to boot .
;D
|
|
|
|
Post by homerbb on Oct 15, 2010 11:42:36 GMT -5
And fun, too.
|
|
|
|
Post by cbrown on Oct 25, 2010 8:29:40 GMT -5
Ya, most people forget about antenna design fun. |
|
|
|
Post by spitfire441 on Oct 26, 2010 4:49:53 GMT -5
Nice ! I like to design and brew my own antennas also. I am working on a 7 element wire beam, non rotateable. Just to point down the thoats of the locals. Big signals can be made with just ERP. Going to prove my point, pun intended.
|
|
Sandbagger
Administrator/The Boss
Posts: 6,250
|
Post by Sandbagger on Oct 26, 2010 6:27:08 GMT -5
Nice ! I like to design and brew my own antennas also. I am working on a 7 element wire beam, non rotateable. Just to point down the thoats of the locals. Big signals can be made with just ERP. Going to prove my point, pun intended. I'm waiting with calibrated eyeball glued to the "S" meter for this project..................... |
|
|
|
Post by homerbb on Oct 26, 2010 7:22:13 GMT -5
Nice ! I like to design and brew my own antennas also. I am working on a 7 element wire beam, non rotateable. Just to point down the thoats of the locals. Big signals can be made with just ERP. Going to prove my point, pun intended. I'm SW of you. Which way are you gonna point that thing? |
|
|
|
Post by spitfire441 on Oct 27, 2010 5:15:52 GMT -5
Nice ! I like to design and brew my own antennas also. I am working on a 7 element wire beam, non rotateable. Just to point down the thoats of the locals. Big signals can be made with just ERP. Going to prove my point, pun intended. I'm SW of you. Which way are you gonna point that thing? WSW of me, Right at Douglassville Pa, from Fagleysville PA. |
|
Sandbagger
Administrator/The Boss
Posts: 6,250
|
Post by Sandbagger on Oct 27, 2010 6:48:35 GMT -5
I'm SW of you. Which way are you gonna point that thing? WSW of me, Right at Douglassville Pa, from f*gleysville PA. Mr Spock says that I'm 277.04 degrees from you............ Or slightly north of due west. |
|
|
|
Post by spitfire441 on Oct 28, 2010 5:31:51 GMT -5
WSW of me, Right at Douglassville Pa, from f*gleysville PA. Mr Spock says that I'm 277.04 degrees from you............ Or slightly north of due west. Yea, I ment WNW, anyway can't argue with the logic of Mr Spock. I have 4 of 7 elements assembled....updates to follow. |
|
Sandbagger
Administrator/The Boss
Posts: 6,250
|
Post by Sandbagger on Oct 28, 2010 6:56:01 GMT -5
Mr Spock says that I'm 277.04 degrees from you............ Or slightly north of due west. Yea, I ment WNW, anyway can't argue with the logic of Mr Spock. I have 4 of 7 elements assembled....updates to follow. Ah, you are getting there. Cool. I can't wait to see how well that thing works. You were S9 during the roundup on the Browning's meter last night with the GP, while Brent was S8 on the cophased sticks. We'll see what the homebrew beam does....... |
|
|
|
Post by homerbb on Oct 28, 2010 8:36:48 GMT -5
Well, if he points it at Sandbagger, I likely won't get any of him in here. I've been considering putting up a small permanent wire yagi sloped across the ridges of my roof, one each of four directions that will rotate with a flip of the switch. Just trying to sneak the setup past the wife is the biggest challenge.  |
|
|
|
Post by homerbb on Dec 10, 2010 21:55:07 GMT -5
|
|
