| Author |
Message |
    
Parts_man
Junior Member
Username: Parts_man
Post Number: 32
Registered: 2-2004
| | Posted on Monday, March 22, 2004 - 6:19 pm: | 
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I have a tower with a pipe clamped to it with the rotor mounted on it. The top side of rotor has a 8 foot 1-3/4" fence pipe. Right now there is only a A-99 at the top, but if ups pulls through in a couple of weeks I will have a PDL-2 to mount up there also.
My main question is can I mount the PDL-2 on the mast and leave the vertical where it is? This would leave the upper portion of pdl with vertical between elements, and the lower portion of pdl would have the mast and part of tower also between elements. How much effect would this have on beam?
Any ideas are welcome. Thanks |
Crafter
Advanced Member
Username: Crafter
Post Number: 990
Registered: 12-2002
| | Posted on Monday, March 22, 2004 - 10:42 pm: |
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I have mounted antrons in between beams before with no great noticable effects. We used our beams for DX and our antrons for local talking. I really noticed nothing except I did lose gain on the reflector side of my antron which is understandable, not alot but some. |
Tech808
Moderator
Username: Tech808
Post Number: 1898
Registered: 8-2002
| | Posted on Tuesday, March 23, 2004 - 2:32 am: |
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Not sure if this will help, but I asked Tech833 about mounting my ANTTRON 305 above my Beams and he suggested to mount the Bottom (Load/Base of Antenna) above the TOP of the Tallest element of the Beam.
Tech833 should read this and he can give you the Best Information.
Hope this Help's.
Lon
Tech808 |
Parts_man
Junior Member
Username: Parts_man
Post Number: 33
Registered: 2-2004
| | Posted on Tuesday, March 23, 2004 - 6:07 am: |
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What if I can replace the pole from the tower to rotor to 11' above tower.
Then come out of rotor 11' and place beam about 1' above rotor and vertical on that.
Would rotor in center w/ metal mast in both directions be ok? |
Sitm
Member
Username: Sitm
Post Number: 57
Registered: 1-2004
| | Posted on Tuesday, March 23, 2004 - 11:27 am: |
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I am interested in how your beam works out I have been thinking about getting the one you have. Please let us know through post. |
Parts_man
Junior Member
Username: Parts_man
Post Number: 34
Registered: 2-2004
| | Posted on Tuesday, March 23, 2004 - 6:18 pm: |
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Sitm, I let you know. Found out today the mail is slower than I thought. Probaly be 3 weeks or so before I get it.
Afer more research found that it would be best to just mount pdl and forget about the a-99. It will be best mounted at another location.
Lon, along with not mounting a-99 inside beam, the beam can't be around tower. This creates a problem. Does anyone know where to get a mounting plate for rotor and a thrust bearing. I am using a Rohn 25G. |
Bullet
Intermediate Member
Username: Bullet
Post Number: 296
Registered: 7-2003
| | Posted on Friday, March 26, 2004 - 10:33 pm: |
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i like to "keep em seperated". i think thats a song!
ive got my colinear on one tower and beams on another tower about 2 wavelengths apart.
i dont want my omni's distorting my beams any! |
Tech8541
Moderator
Username: Tech8541
Post Number: 144
Registered: 12-2003
| | Posted on Friday, March 26, 2004 - 11:08 pm: |
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bullet wrote;
i like to "keep em seperated". i think thats a song!
--------------
band is the 'offspring'. so i can now add music likes to the list, which includes military, of why i like you. |
Ozzie
Intermediate Member
Username: Ozzie
Post Number: 167
Registered: 11-2003
| | Posted on Saturday, April 03, 2004 - 4:34 pm: |
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It's always better to mount any vertical above a beam so that the elements of the ebam are clear of the vertical. Reduces any chance of interactin between the antennas.
Now surprisingly an unconnected antenna can be a major source of RFI if a transmitter is operated on the antennas resonant frequency (not always but often enough to be a concern). So no matter how you space the two try to ensure the non used antenna is connected to groundvia a grounding antenna switch. You might not need it BUT you never know. |
Bullet
Intermediate Member
Username: Bullet
Post Number: 312
Registered: 7-2003
| | Posted on Wednesday, April 14, 2004 - 7:14 pm: |
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ozzie good job!
ss8541, cool song! thanks for the help on the cobra 29 i plan on tring that sometime after i get my ts 667v.
you da man.
later
bullet |
