The Defpom Forum, for RadioMods, S&M Software and Music by The Defpom

HomerBB

They look great! Thanks for sharing them.

HomerBB

Because I was asked, the best vertical of those I've made: 1. 1/4 wave Ground Plane : Smaller than many others, light weight, easy to mount, simple to build. Wide-banded, easy match. No matching network required which translates to diminished losses. Potential to handle lots of power because there i...

HomerBB

They are the prongs that the little foil covered board at he back of the main board near the finals is suspended between.

Look here. They will be at the upper center of the picture.

HomerBB

Because someone asked for it: I used two of these: http://i1205.photobucket.com/albums/bb426/Chal_Cirilo/64wave/zplate.jpg and one of these: http://i1205.photobucket.com/albums/bb426/Chal_Cirilo/64wave/081942088196.jpg I straightened the Z plates into L's, and combined them with the mending plate to...

HomerBB

Close up shots of the current matching coil.

HomerBB

Thanks, Animal.
I love this part of the hobby most, and will surely enjoy your photos when you get them up.

HomerBB

I took some much more gradual readings of the antenna in its latest configuration today @ 34' elevation: 29.350----2.0----R24--X4 29.250----2.0----R25--X2 29.150----1.9----R26--X5 29.050----1.8----R28--X8 29.000----1.7----R29--X10 28.950----1.7----R30--X12 28.900----1.7----R32--X12 28,850----1.6----...

HomerBB

Worked on the antenna some more, and not so sure I've noted any improvements from the analyzer standpoint. I put on a cap hat just to see if it made any measurable difference. It has an overall diameter of 14". I had to work at an acceptable shortening length for the antenna vertical, and ended...

HomerBB

Up on the platform working on the antenna again.

HomerBB

I have added the platform to work from to the top of the wooden section. As with all things I do, there is a little at each stage that tells me I have a little more to do. I am going to add some more guys, especially at the top of the wood section, if I'm going to send any time on that platform. I h...

HomerBB

I have a little more work to do on the tower to get it where I want it to be. One more innovation will be an 18" x 30" platform near the top of the wooden section that I can raise when I want to stand up there and work with the antennas, and will fold downward against the side of the tower...

HomerBB

I have made some modifications to the tip over tower that will beef it up. It is now comprised primarily of an ?- beam constructed of treated 2 x 10 x 16' and 2 x 4 marrying them together. Inside the beam I have mounted my 40' push-up so that the bottom of it is 1' above the break-over point. This a...

HomerBB

These readings are on the antenna after I brought it back down to 13' height so I can modify my tip over tower to make it more testing friendly. What we have is several readings of the antenna with the latest matching system as previously posted. The readings are 4 different sets consisting of the ...

HomerBB

http://i1205.photobucket.com/albums/bb426/Chal_Cirilo/64wave/F0168.jpg Taking the readings from within the shack, antenna at 42' height: 28.265 ------------ 2.0 R=61 X=34 27.979 ------------ 1.5 R=49 X=22 27.571 ------------ 1.0 R=45 X=1 27.555 ------------ 1.0 R=46 X=1 27.405 ------------ 1.2 R=49...

HomerBB

Hello, Johno. Fancy meeting you here! I worked on this thing some more today trying to prove to myself it could be done. Here is what I did and the results. First using this coil: http://i1205.photobucket.com/albums/bb426/Chal_Cirilo/64wave/4612/F0166.jpg 2.0 R= 28 X= 21 --------- 28.713 1.5 R= 56 X...

HomerBB

I raised the antenna up 5' to 13' elevation, and as I had suspected, everything went south. Apparently some ground losses were affecting the match, and the appearance of being good was a result of being too near the earth. So I've been working on improvements in mechanics of the antenna, and it's tu...

HomerBB

I decided I wanted to put another 5/8λ Omni in the air before I moved on to other antennas, but decided why not go .64 first and see if I like it. To me it looks really short after working with Sigma IV/Vector 4k antennas. I have to get my photos ready, and post some current results so far with the ...

HomerBB

I was asked by some to break the steps down and add photos for them. This is it. If you want a vertical dipole then: 1. get two 1' pieces of PVC with sufficient diameter to insert an aluminum tube into. Because my materials for this dipole Require I have a taper on each end I am making the lower ins...

HomerBB

Due to questions on various forums I am posting this re the dipole. The one in the above photos over the Yagi was mine, the other I made for a fellow across town who lacked funds for a decent antenna and was using a mobile mag-mount on a window air conditioner. Both of them performed as well as a di...

HomerBB

There has been some repeated interest in homebrewing a suitable dipole for vertical use on several forums and numerous threads. I decided to put this info up so a forum seach could take them directly to this method of getting on the air with an easy to make, pole mountable, rigid version of the vert...

HomerBB

It's up at 37' to the boom, now.
With the 80" spacing on the new aluminum boom, it seems to have smaller beamwidth than it did with spacing at 75", the last spacing.

HomerBB

Cleaned it up a little more:

HomerBB

Today I constructed a reflector and put it on the boom with the driver. Tomorrow I hope to finish it and see how it does. After that we'll see about perhaps making it dual polarity. . .

HomerBB

Well, It went up on its edge:

and then because I already had the director stored behind the shed it grew and appendage:

HomerBB

Some have said it's hard to tell whether the loop is mounted vertical or horizontal. I hope this helps:

Some things are so lovely it almost makes you cry . . .

HomerBB

Alright, now about the way an adjustable whip antenna can be devised from this simple extension. Follow the logic of the photos. If unclear, just ask me. Be aware that the tube length is as needed/desired, and that because the only 102" SS whip on the premises is up in the air as the top sectio...

HomerBB

I have a loop in the attic, but I decided to take a loop outdoors, so I built a 11 meter quad loop and parked it horizontally at 30' elevation. It is only 10' above the roof ridge. Here are some photos of the building process. Just ask if you don't follow the photos. http://i1205.photobucket.com/alb...

HomerBB

As an example, here is an antenna load from Radio Shack that requires a 57" whip and is normally bottom loaded. Putting it on the riser required a shorter whip, but not a direct trade off. The over all length of the antenna with the riser under it is 80". According to the MFJ-209, I have a...

HomerBB

For those who need a riser/extender for whatever purpose, whether to get your mobile antenna coil above your truck cab, or simply to get it higher, one method I've used is as easy as a trip to the local Home Depot for some brass fittings, a 3/8-24 x 1-1/4" bolt, and a tube that is of 5/8" ...

HomerBB

You're welcome, Scott.

The forum offers invaluable information for the hobby in a lot of ways. I count it a privilege to be here.

Charles/Homer

HomerBB

From the beginning I have planned to use a 102" steel whip as the top section of the antenna. I hadn't prepared it yet, so I went with a tube and solid aluminum rod for the upper most section. In these photos you'll see the 102" whip mounted to a fluted 1/2" tube picked up for 50¢ fro...

HomerBB

I appreciate the interest. materials do cost,
but the key is to slowly accumulate pieces from junk yards,
yard sales, etc until you have it all together at low cost.

You take care, too.

HomerBB

Here's the exploded view of the bottom connector setup for the gamma match:

HomerBB

I had reported to some that there seemed to be excessive white noise on the SigmaIV when pre-amp was on. I need to make a correction here. In spite of how embarrassing it can be, I was hearing this whote noise increase on the loop in the attic. I had switched the coaxes on the antenna switch and for...

HomerBB

Should anyone get inspired to try this, the materials are simple. Tubing : start with minimum diameter of 1-1/4" for bottom section and have a finished total length of 28' 7" when all are joined together from largest at bottom to smallest at top. Radials : three or four tubes/rods that are...

HomerBB

As a matter of interest to those looking for a stout way to mount a gamma: As for the bottom of the gamma, what you see there comes from making the mobile antennas. For a person without a true fabrication facility getting a mobile antenna together was not too much a problem, but finding a way to sec...

HomerBB

More Photos: http://i1205.photobucket.com/albums/bb426/Chal_Cirilo/SigmaIV/6164.jpg http://i1205.photobucket.com/albums/bb426/Chal_Cirilo/SigmaIV/6162.jpg http://i1205.photobucket.com/albums/bb426/Chal_Cirilo/SigmaIV/6160.jpg http://i1205.photobucket.com/albums/bb426/Chal_Cirilo/SigmaIV/6159.jpg htt...

HomerBB

I decided to use the materials I had at hand to make another antenna to replace the Qv4k I had traded away for a radio I wanted. I knew I could always make another antenna, and lacked the skills to build a radio. So I did. Here is the Made in the USA SigmaIV :wink: This antenna is built virtually id...

HomerBB

I'd like to know that answer, too.

HomerBB

Will do. I am forgetful, so you can call if I forget. I have to check my work schedule.

HomerBB

Welcome, everyone.
Hope you find what you're looking for here: an opportunity to learn, and to share.

Homer

HomerBB

Try these links: Schematic diagram: http://www.cbtricks.com/radios/alan/alan8001/graphics/Alan%208001.pdf (A8001) http://www.cbtricks.com/radios/superstar/3900/graphics/ss3900_sch.gif (SS3900) http://www.cbtricks.com/radios/galaxy/dx33hml/graphics/dx33hml_sch_main.pdf (Galaxy DX-33) Wiring layout: h...

HomerBB

Welcome to the site, kulaguy, and thanks for your interest in the antenna. Building and using homebrew antennas is the best part of the radio hobby for me. I do it for the pleasure I get from it, but sometimes I also save money. There are several antennas I have built and are now flying over someone...

HomerBB

Use this board number, EPT360014B, to locate info on your rig. It looks like mine except for color - I have gold face - and your power plug is newer. Mine is EPT360010.
I think it's worth saving, if possible.

Come by Rogers Home Depot and see me.

Charles/Homer

HomerBB

A picture of the radio front might help. also, there should be an info tag on the back with some potentially helpful data on it. Additionally, there is an etched board number on the board itself that will tell your relevant info about your model. That number should be EPT3600xxx - with potentially t...

HomerBB

I have the Homebrew Astroplane back up temporarily as I do repairs and upgrades to the tip-over tower. The SWR is still great, and it works a charm. http://i1205.photobucket.com/albums/bb426/Chal_Cirilo/Astroplane/5638.jpg http://i1205.photobucket.com/albums/bb426/Chal_Cirilo/homebrew%20wooden%20tow...

HomerBB

1. Volume On/Off switch. 2. Squelch - lower the noise threshold allowing only the strongest, hopefully clearest, signals through the speaker. 3. RF Gain - limits the receiver's ability to receive more distant signals permitting only stronger nearby signals to be received. 4. Clarifier - on radios eq...

HomerBB

I picked this up today from a friend. It appears to have a channel mod in it (notice the knob on the left side of the radio). I think the anl/nb buttons may be part of the band selection setup. I've had no time today to put a frequency counter on it and figure out the road map for it. http://i1205.p...

HomerBB

The worst has gone by for now, and everything is still standing.
Score:

Storm 1 ------- Qv4k 1

HomerBB

The weather is going nuts again.

Search found 68 matches