Jump to content

BuyTwoWayRadios.com

Photo

Antenna Bar Mount


  • Please log in to reply
39 replies to this topic

#21 WRAF233

WRAF233

    Advanced Member

  • Members
  • PipPipPip
  • 142 posts
  • LocationNevada
  • GMRS Callsign:WRAF233

Posted 09 January 2020 - 09:54 AM

Great stuff guys.  And an education for offroad stuff to consider.  There are few if any repeaters where I ride so the unity gain sounds like the ticket.  That means I can go with 6" 1/4 wave for all the reasons you guys list.  Typically layman of me to think a taller antenna MUST have better range and performance than a tiny 6".. lol.

 

The NMO connector you list has 17' of RG58 when I need only 6 - 8' and don't want to coil any extra.  Hence the attempt to get a custom built cable.  Still working on that at the Antenna Farm. Not finding an option for NMO on one end and 259 on the other.  There is this:  

https://www.theanten...axrad-mtpm-1157  

and I could get my custom length cable with PL259 on both ends, eh?


WRAF233

NE NV


#22 berkinet

berkinet

    Advanced Member

  • Members
  • PipPipPip
  • 527 posts
  • GMRS Callsign:WQYR510
  • Ham Callsign:WB6TAE

Posted 09 January 2020 - 10:03 AM

...The NMO connector you list has 17' of RG58 when I need only 6 - 8' and don't want to coil any extra.  Hence the attempt to get a custom built cable.  Still working on that at the Antenna Farm. Not finding an option for NMO on one end and 259 on the other. ...

 

If you can get the antenna mount with a shorter cable, I'd buy it. But, the loss from an extra 16 feet of cable is only 1.6db. I wouldn't worry too much about it. 

 

One other thing. NMO is a specification for an antenna mount - the juncture between the antenna and the post it will mount on.  It is not a cable connector. So, what you want is an NMO mount with 1 foot cable terminated with an RG58. Just ask the Antenna Farm if they can chop 16 feet off your cable and solder on a new connector.  But, Is the antenna really only < 1 foot from the antenna?


Everything we hear is an opinion, not a fact. Everything we see is a perspective, not the truth.

-- Marcus Aurelius


#23 WRAF233

WRAF233

    Advanced Member

  • Members
  • PipPipPip
  • 142 posts
  • LocationNevada
  • GMRS Callsign:WRAF233

Posted 09 January 2020 - 10:40 AM

If you can get the antenna mount with a shorter cable, I'd buy it. But, the loss from an extra 16 feet of cable is only 1.6db. I wouldn't worry too much about it. 

 

One other thing. NMO is a specification for an antenna mount - the juncture between the antenna and the post it will mount on.  It is not a cable connector. So, what you want is an NMO mount with 1 foot cable terminated with an RG58. Just ask the Antenna Farm if they can chop 16 feet off your cable and solder on a new connector.  But, Is the antenna really only < 1 foot from the antenna?

No, I need 6 - 8 ft. of cable from antenna to radio.  I'm not worried about the loss but I don't want to roll up a bunch of unneeded cable in the side-by-side.

Will contact the Farm for custom stuff.

 

Thanks.


WRAF233

NE NV


#24 BoxCar

BoxCar

    Advanced Member

  • Members
  • PipPipPip
  • 108 posts
  • LocationArden, NC
  • GMRS Callsign:WRCM737

Posted 09 January 2020 - 10:49 AM

Any local radio shop should also be able to do the work of shortening the cable as well.


  • Elkhunter521, kipandlee and RCM like this

Old and wise infers you were once young and stupid


#25 berkinet

berkinet

    Advanced Member

  • Members
  • PipPipPip
  • 527 posts
  • GMRS Callsign:WQYR510
  • Ham Callsign:WB6TAE

Posted 09 January 2020 - 10:50 AM

No, I need 6 - 8 ft. of cable from antenna to radio.  I'm not worried about the loss but I don't want to roll up a bunch of unneeded cable in the side-by-side.

Will contact the Farm for custom stuff.

 

Oops. I mistook thefor a ".   In the case of eight feet, the loss is minuscule  like 0.8db. But, if there is no place for the coil it is probably a good idea to pay a bit extra to get the right length. BTW, UHF male connectors are among the easiest to attach on your own, if you were interested in having a whack at the cable on your own.


  • Elkhunter521 and RCM like this

Everything we hear is an opinion, not a fact. Everything we see is a perspective, not the truth.

-- Marcus Aurelius


#26 RCM

RCM

    Advanced Member

  • Members
  • PipPipPip
  • 297 posts
  • LocationNorth Alabama
  • GMRS Callsign:WRCM718
  • Ham Callsign:KU4FL

Posted 09 January 2020 - 11:49 AM

Oops. I mistook thefor a ".   In the case of eight feet, the loss is minuscule  like 0.8db. But, if there is no place for the coil it is probably a good idea to pay a bit extra to get the right length. BTW, UHF male connectors are among the easiest to attach on your own, if you were interested in having a whack at the cable on your own.

Connecting to an NMO is even easier, if you can solder at all.



#27 quarterwave

quarterwave

    Advanced Member

  • Members
  • PipPipPip
  • 303 posts
  • LocationOh-io
  • GMRS Callsign:KAF4073
  • Ham Callsign:K8MLO

Posted 09 January 2020 - 07:48 PM

Quarterwave antennae on VHF and UHF were always highly recommended when I ran the radio shop. I could solve alot of problems when I took a gain antenna off and put that little 6" quarter whip on instead. 


  • RCM likes this

#28 RCM

RCM

    Advanced Member

  • Members
  • PipPipPip
  • 297 posts
  • LocationNorth Alabama
  • GMRS Callsign:WRCM718
  • Ham Callsign:KU4FL

Posted 09 January 2020 - 11:06 PM

Quarterwave antennae on VHF and UHF were always highly recommended when I ran the radio shop. I could solve alot of problems when I took a gain antenna off and put that little 6" quarter whip on instead. 

Agreed. If a quarterwave antenna has a problem, you can see it just by looking at it.



#29 WRAF233

WRAF233

    Advanced Member

  • Members
  • PipPipPip
  • 142 posts
  • LocationNevada
  • GMRS Callsign:WRAF233

Posted 14 January 2020 - 09:50 PM

Thinking I'll attach an aluminum (bolt) or steel (weld) 1.5 - 2" angle iron about 13" long to the kayak rack and drill a hole for NMO and antenna.  Should provide a decent ground plane for the quarterwave antenna.


WRAF233

NE NV


#30 kipandlee

kipandlee

    Advanced Member

  • Members
  • PipPipPip
  • 47 posts

Posted 15 January 2020 - 08:36 AM

you can get  no ground plane antennas wouldn't that be easier https://www.theanten...f-antennas-215/  haven't ever used one myself maybe some of the members here have and could  give some advice as to there performance 



#31 WRAF233

WRAF233

    Advanced Member

  • Members
  • PipPipPip
  • 142 posts
  • LocationNevada
  • GMRS Callsign:WRAF233

Posted 15 January 2020 - 09:00 AM

you can get  no ground plane antennas wouldn't that be easier https://www.theanten...f-antennas-215/  haven't ever used one myself maybe some of the members here have and could  give some advice as to there performance 

Pretty much covered earlier in this thread.

 

Thanks.


  • kipandlee likes this

WRAF233

NE NV


#32 WRAF233

WRAF233

    Advanced Member

  • Members
  • PipPipPip
  • 142 posts
  • LocationNevada
  • GMRS Callsign:WRAF233

Posted 28 January 2020 - 10:37 PM

Looking at this to resolve my concerns for a ground plane on UTV side x side.  https://www.theanten...logies-mbc-1649.  The one with SO-239 

 

Instructions say cut radials to 8" for 406 - 512Mhz but using this calculator it comes out to 6.25" or so.  Either way has to be better than little to no GP.

 

I have a good visual on how to install on the kayak rack above the double plastic roof.   And I expect to get some grief on the trail from the non-believers.. beam me up..  but it should hopefully maximize GMRS performance.

 

Critique away please.


WRAF233

NE NV


#33 Jones

Jones

    Advanced Member

  • Members
  • PipPipPip
  • 325 posts
  • GMRS Callsign:WQYM541
  • Ham Callsign:KB0HAW

Posted 29 January 2020 - 10:21 AM

Looking at this to resolve my concerns for a ground plane on UTV side x side.  https://www.theanten...logies-mbc-1649.  The one with SO-239 

 

Instructions say cut radials to 8" for 406 - 512Mhz but using this calculator it comes out to 6.25" or so.  Either way has to be better than little to no GP.

 

I have a good visual on how to install on the kayak rack above the double plastic roof.   And I expect to get some grief on the trail from the non-believers.. beam me up..  but it should hopefully maximize GMRS performance.

 

Critique away please.

No critique needed.  This looks like a great solution for your particular installation.  ...and even fairly in-expensive.

 

As for the radials being longer than the calculated length, keep in mind that an NMO feed point is elevated up from the plane level, thus the plane surface area will need to be slightly longer.  Follow Laird's directions.


  • WRAF233 likes this

#34 mainehazmt

mainehazmt

    Advanced Member

  • Members
  • PipPipPip
  • 171 posts
  • GMRS Callsign:WQNI 696
  • Ham Callsign:KC1DRW

Posted 29 January 2020 - 08:12 PM

There are available NO GROUND antennas. They work fairly good  price is good too    https://www.theanten...rad-muf4502-839

used on on my camper and my utv 



#35 WRAF233

WRAF233

    Advanced Member

  • Members
  • PipPipPip
  • 142 posts
  • LocationNevada
  • GMRS Callsign:WRAF233

Posted 29 January 2020 - 08:43 PM

There are available NO GROUND antennas. They work fairly good  price is good too    https://www.theanten...rad-muf4502-839

used on on my camper and my utv 

 

Yes, that's been discussed.  Seems the 1/4 wave will work best as far as RF goes and has the added benefit of it's 6" length.  The NGP antennas are much longer and would be a pain for overhead clearance on a UTV, would require spring loaded base, etc.  

I'll probably run the 6" on the kayak rack with an extension bracket for starters to see how it works then move to the ground plane listed above if I think it will help. 

The antenna will be on a 2" flat of angle aluminum that is tied to a 1" wide piece of steel, in turn tied to 1.5" steel roll bar.. all above the UTV plastic roof.  Not as complicated as it sounds.

 

Expecting my Kenwood 880 (and a 3170) Friday so will probably get the install done over the weekend.  I'll post pictures if allowed and we can tear into it then.  Nothing will be done that can't be undone or modified (bolts, not welds), and done with stuff I had laying around.


WRAF233

NE NV


#36 RCM

RCM

    Advanced Member

  • Members
  • PipPipPip
  • 297 posts
  • LocationNorth Alabama
  • GMRS Callsign:WRCM718
  • Ham Callsign:KU4FL

Posted 03 February 2020 - 11:04 AM

Looking at this to resolve my concerns for a ground plane on UTV side x side.  https://www.theanten...logies-mbc-1649.  The one with SO-239 

 

Instructions say cut radials to 8" for 406 - 512Mhz but using this calculator it comes out to 6.25" or so.  Either way has to be better than little to no GP.

 

I have a good visual on how to install on the kayak rack above the double plastic roof.   And I expect to get some grief on the trail from the non-believers.. beam me up..  but it should hopefully maximize GMRS performance.

 

Critique away please.

Personally, if I had already bought that I still wouldn't use it on the UTV. I would just save it to use at the house, cabin or whatever. The 13" of angle iron or aluminum will be enough ground plane.



#37 WRAF233

WRAF233

    Advanced Member

  • Members
  • PipPipPip
  • 142 posts
  • LocationNevada
  • GMRS Callsign:WRAF233

Posted 03 February 2020 - 11:32 AM

Personally, if I had already bought that I still wouldn't use it on the UTV. I would just save it to use at the house, cabin or whatever. The 13" of angle iron or aluminum will be enough ground plane.

 

Yup, I've put that one out of my mind for this application.  The installation is complete on the UTV and I think it will be fine. 

Waiting on software and cable to arrive so I can go through and verify programming on the 880 to be sure everything it correct and maybe change some button assignments  (same thing, different hard and software for the 3170 HT).

Hopefully, I won't stumble around too much with the software.

 

Or.. I could move the 880 to my pickup and just use PL259 - SMA jumper for HT in the UTV on the mobile antenna.. I'm actually liking that idea - (attribution for that idea to WREN301).


WRAF233

NE NV


#38 RCM

RCM

    Advanced Member

  • Members
  • PipPipPip
  • 297 posts
  • LocationNorth Alabama
  • GMRS Callsign:WRCM718
  • Ham Callsign:KU4FL

Posted 04 February 2020 - 03:51 PM

Yup, I've put that one out of my mind for this application.  The installation is complete on the UTV and I think it will be fine. 

Waiting on software and cable to arrive so I can go through and verify programming on the 880 to be sure everything it correct and maybe change some button assignments  (same thing, different hard and software for the 3170 HT).

Hopefully, I won't stumble around too much with the software.

 

Or.. I could move the 880 to my pickup and just use PL259 - SMA jumper for HT in the UTV on the mobile antenna.. I'm actually liking that idea - (attribution for that idea to WREN301).

Last TK-880 I bought didn't cost much more than a PL259-SMA adapter. In fact I passed on some just last week that were $15 each.

If I were you I would put the 880 in the UTV, get another one for the truck, and probably a couple more as backups. But that's just how I roll! :D

 

I was actually thinking awhile back that I had several TK-880s. But I started looking for them and could only find one that wasn't already in a vehicle. So I looked around for some cheap ones and bought three more for just over $20 each.

 

You're gonna need two for your repeater! What repeater, you ask? Just wait! :lol:


  • WRAF233 likes this

#39 WRAF233

WRAF233

    Advanced Member

  • Members
  • PipPipPip
  • 142 posts
  • LocationNevada
  • GMRS Callsign:WRAF233

Posted 04 February 2020 - 04:26 PM

Last TK-880 I bought didn't cost much more than a PL259-SMA adapter. In fact I passed on some just last week that were $15 each.

If I were you I would put the 880 in the UTV, get another one for the truck, and probably a couple more as backups. But that's just how I roll! :D

 

I was actually thinking awhile back that I had several TK-880s. But I started looking for them and could only find one that wasn't already in a vehicle. So I looked around for some cheap ones and bought three more for just over $20 each.

 

You're gonna need two for your repeater! What repeater, you ask? Just wait! :lol:

 

I'm skeptical about buying off Ebay but it sounds like lots of folks have good luck there.  Assuming that's where you get them.   I spend the extra to get a 90 day warranty and to be sure it works out of the box.  I have no interest in getting 2 or more to 'make' one good one.  If you find one you're passing on, pass it on to me if from a reputable seller and I'd consider it.. kidding, sort of..

 

Regardless of where I buy, I am leaning toward another 880 in the pickup.  The UTV install turned out well IMO so will see how much use it gets this summer on the trails, etc.

 

Yeah, repeater.  Don't need one at home, there's already two within easy reach of both my HT.  I have a piece of dirt in Montana that would be close to ideal @ 5600', open with no trees or big buildings, looking over a good size town several hundred feet below and a couple valleys that stretch a long way.  Closest repeater to that area is well over 100 mi. LOS and behind a few 10k ft. mountain ranges.  Also happens to be at the junction of two major interstate highways.  But I don't live there, visit a couple times a year only, so it would be more of a GMRS community service, if there's even a GMRS "community" in the area.  Build it and they will come.

..and I know squat about requirements, as in enclosures, tower/pole, batteries with solar I'm assuming would be the ticket.  Maybe I could find someone to maintain it for their group or such.  Anyway..


  • RCM likes this

WRAF233

NE NV


#40 kb2ztx

kb2ztx

    Advanced Member

  • Members
  • PipPipPip
  • 156 posts
  • LocationEast Coast
  • GMRS Callsign:WQLY948
  • Ham Callsign:KB2ZTX

Posted 05 February 2020 - 08:50 AM

Looking at this to resolve my concerns for a ground plane on UTV side x side.  https://www.theanten...logies-mbc-1649.  The one with SO-239 

 

Instructions say cut radials to 8" for 406 - 512Mhz but using this calculator it comes out to 6.25" or so.  Either way has to be better than little to no GP.

 

I have a good visual on how to install on the kayak rack above the double plastic roof.   And I expect to get some grief on the trail from the non-believers.. beam me up..  but it should hopefully maximize GMRS performance.

 

Critique away please.

 

I actually used on of these directly thru the plastic roof of a UTV. It worked well on UHF. Tried similar on a VHF install and while it worked OK, I was  a bit more challenging to install. I run one on my motor home ladder mount now with a quaterwave antenna for my on board repeater. 


  • WRAF233 likes this




0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users