| Author |
Message |
    
Milky
New member
Username: Milky
Post Number: 1
Registered: 5-2004
| | Posted on Thursday, April 07, 2005 - 2:36 pm: | 
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I AM BIULDINGMY FIRST BEAM. ANM-104. THE FIRST DIRECTOR ELEMENT IS ONLY 4-5 INCHES FROM THE MAST PIPE IS THIS CORRECT?ALSO WITH THE ANT. ON THE FLAT SIDE 8 FEET OF THE GROUND MY SWR IS 1.5 ON 40AND 1.5 ON 1. SWR ON MY IMAX IS 1.1 TO 1.2
THE INSRUCTIONS SAY THE SWR WILL DROP ON THE M-104 WHEN YOU TURN IT VERTICAL AND PUT IT IN THE AIR IS THIS TRUE ,HOW MUCH WILL IT DROP,DO I NEED TO TRY TO GET IT LOWER BEFORE PUTTING IT ON THE TOWER? MY TOWER IS 60 FEET WITH 10 FEET OF MAST PIPE COMMING OUT OF THE TOWER. ANY HELP WOULD BE GREATLY APPRECIATED!! THANKS |
Kj7gs
Junior Member
Username: Kj7gs
Post Number: 23
Registered: 12-2004
| | Posted on Thursday, April 07, 2005 - 8:25 pm: |
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Try placing the beam vertically toward the sky(director at the top) and see if your readings change at all. Don't know if it will match what you get when it's up in the air, but I've seen a couple of hams do it that way before putting their beams up on the tower. Proximity to ground has a definite effect on impedance. You may have to make some final adjustments at 60 feet. Be safe... |
Milky
New member
Username: Milky
Post Number: 2
Registered: 5-2004
| | Posted on Thursday, April 07, 2005 - 10:43 pm: |
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THANKS FOR THE INFO. I DID SOME MORE TUNNING THIS AFTERNOON AND GOT IT TO 1.2 ON THE FLAT SIDE. WERE GOING TO PUT IT UP THIS SATURDAY, SO I WILL LET YOU KNOW WHAT HAPPENS. THANKS
AKA SEAHAWK 722 N.C. |
Scrapiron63
Advanced Member
Username: Scrapiron63
Post Number: 817
Registered: 12-2001
| | Posted on Thursday, April 07, 2005 - 11:14 pm: |
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Milky I have my tower on a hinge plate. With the tower raised off the ground a few feet, I put the vertical beam on the mast with the side of the beam toward the ground, maybe clearing the ground about 6 feet, just so I can reach the gamma match. I set the swr as low as possible like this, and it always stays the same or goes a little lower when I raise the tower up. This works for me anyway. scrapiron |
Marconi
Intermediate Member
Username: Marconi
Post Number: 422
Registered: 11-2001
| | Posted on Friday, April 08, 2005 - 12:19 am: |
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Sounds a little close to me. I think the instructions say set the boom to mast plate in the center of the boom. After you set the elements as instructed maybe the driver will be a bit farther from the mast than the first director, but I believe 4"-5" is a bit close. Main thing is that when you hold the beam at this plate that the antenna appears to be in balance and not heavy on one end or the other.
From my quick check it looks like the driver will sit about 34" from the mast and the first director will sit about 11" from the mast on the other side. This is an optimized design setting for this antenna and the spacing will not appear balanced along the boom.
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Allagator
Advanced Member
Username: Allagator
Post Number: 568
Registered: 9-2002
| | Posted on Friday, April 08, 2005 - 5:40 pm: |
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Milky if you plan on running the M104 and the I-max on the same tower you mite want to rethink things !!!
but i have run a M104C for a few years now and i set mine up the same way but i had a 10 foot test tower and i could stand on top of the truck and work on the beam from there , but turning it up to the vert would cause it to hit the tower ! so i kept mine flat and run my Gatorod off the side of my tower for local talking !
Hope this helps !!!!
Allagator !
CEF115 |
Dx431
Senior Member
Username: Dx431
Post Number: 1003
Registered: 2-2002
| | Posted on Friday, April 08, 2005 - 9:18 pm: |
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Gator, whats wrong with running the Imax and the 104 on the same tower??? I've got a M103 and an A99 on the same tower and have no problems.
Would you care to elabarate???
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Allagator
Advanced Member
Username: Allagator
Post Number: 569
Registered: 9-2002
| | Posted on Saturday, April 09, 2005 - 9:26 am: |
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DX if they are both vet they wont work to well togeather but if the beam is flat it will work just fine !
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Road_warrior
Intermediate Member
Username: Road_warrior
Post Number: 465
Registered: 7-2004
| | Posted on Saturday, April 09, 2005 - 1:19 pm: |
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I agree with Gator: If beam is mounted
on tower verticle, another antenna should
be mounted separate.
If beam is mounted Horz Flat side then
another antenna can be mounted above it
on tower. YEP, YEP
JIM/ PA/ CEF 375 |
Dx431
Senior Member
Username: Dx431
Post Number: 1004
Registered: 2-2002
| | Posted on Saturday, April 09, 2005 - 1:29 pm: |
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Are you talkin from experience or is this theory?
Just curiuos, I haven't tried it. I have heard of verticles above MoonRakers and Quads that worked well, but not above a 3 or 4 element verticle beam. |
Road_warrior
Intermediate Member
Username: Road_warrior
Post Number: 466
Registered: 7-2004
| | Posted on Saturday, April 09, 2005 - 7:34 pm: |
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I have mounted a Imax above a flat side
beam./ Never tried mounting it above a
verticle positioned beam./ Has to throw
something out of whack./ So, this is
theory. LOL...
JIM/ PA/ CEF 375 |
Milky
New member
Username: Milky
Post Number: 3
Registered: 5-2004
| | Posted on Sunday, April 10, 2005 - 1:04 am: |
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JUST AN UPDATE
GOT IT IN THE AIR. I LOVE IT. BAD NEWS. NEXT WEEK ILL HAVE TO TAKE IT BACK DOWN THE SWR IS 1.1 ON 1 AND 1.9 ON 40 BUT SHOULD BE AN EASY FIX [CROSS YOUR FINGERS] THANKS FOOR THE HELP. I THINK IM HOOKED ON THE BEAM!!!!
SEAHAWK 722 N.C. |
Road_warrior
Intermediate Member
Username: Road_warrior
Post Number: 469
Registered: 7-2004
| | Posted on Sunday, April 10, 2005 - 10:22 pm: |
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Hi Milky,
Let me know how you make out... Thanks
Jim/ PA/ CEF 375 |
Dx431
Senior Member
Username: Dx431
Post Number: 1008
Registered: 2-2002
| | Posted on Sunday, April 10, 2005 - 11:30 pm: |
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Kewl!
How did ya mount it? Verticle or Horizontal? |
Milky
New member
Username: Milky
Post Number: 4
Registered: 5-2004
| | Posted on Monday, April 11, 2005 - 12:09 pm: |
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IT IS MOUNTED VERTICAL. THE REJECTION IS AWESOME ON THE CORNERS!!! QUESTION? WITH SWR BEING HIGHER ON 40 THE GAMMA MATCH SHOULD BE SHORTENED
WRIGHT? GOING TO TRY TO GET TO IT THIS WEEKEND OR NEXT I WILL LET YOU KNOW WHAT HAPPENS |
Milky
New member
Username: Milky
Post Number: 5
Registered: 5-2004
| | Posted on Monday, April 11, 2005 - 12:12 pm: |
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ALSO THE IMAX IS 70 FEET UP IN A PINE TREE. I HAVE ALWAYS HEARD THATWHEN A BEAM IS MOUNTED VERTICAL DONT MOUNT YOUR GROUND PLANE ON TOP SO IM GOING TO LEAVE IT IN THE PINE TREE.THANKS FOR THE HELP |
Road_warrior
Intermediate Member
Username: Road_warrior
Post Number: 477
Registered: 7-2004
| | Posted on Wednesday, April 13, 2005 - 3:19 pm: |
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Keep us posted on the Maco 104 performance.
I have to help a friend mount one
here soon. His is going on a 50 foot
tower.
JIM/ PA/ CEF 375 |
Milky
New member
Username: Milky
Post Number: 8
Registered: 5-2004
| | Posted on Monday, August 08, 2005 - 1:05 pm: |
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I AM FINALLY STARTING BACK TO WORK ON MY BEAM. I CANT GET THE SWR DOWN ON CHANELS 20-40 ADJUSTING THE GAMAMATCH. WILL SHORTNING THE DRIVER ELEMENT HELP? THE BEAM IS BACK ON THE GROUND NOW. I AM GOING TO DOUBLE CHECK ALL MY MEASUREMENTS. I HAVE BEEN USING IT ON CHANNELS 1-20 WITH GOOD SWR EVEN WITH MY SB220 ON THE SWR IS GOOD . BUT APPLY POWER ON 20-40 SWR GOES FROM ABOUT 1.8-1.9 TO A 3 !!!!!!!!! ANY HELP WOULD BE GREAT. WITH SAME RADIO AND AMP ON IMAX IT IS FLAT. I HAVE JUST BEEN FLUSTERED WITH IT.
SEAHAWK 722 NC |
