WSAZ909
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Posts posted by WSAZ909
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5 minutes ago, kidphc said:
It is really no different then cb. Just really the wavelengths. Hence why we jokingly call it uhf cb. Hopefully, it doesn't get as bad.
Yes you can mount two gmrs antennas on the same plane. I would recommend unplugging (antenna port on radio) / turning one off when the other is in use. Rf will still leak into the other radio's finals.
11m/cb is not a damaging harmonic (not even sure if it a harmonic, to lazy to check) of 2m/70/gmrs.
As long as the antennas aren't too close shouldn't be a problem.
My 11/10m antenna is on the rear hatch (driver side of hatch). The 2m/70cm on the hood and the gmrs on the center rear hatch about 3 ft from the cb antenna. Never had problems with it even when using 10m at 50w.
Sent from my SM-S901U using Tapatalk
Looks like I will be using tailgate mounts for separating and reserve the roof plate for GMRS, they are the shorter type ( nmo browning br-176s, and midland mxta-25 ). I will check continuity of each for mounting grounds/connections.
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41 minutes ago, WSAM454 said:
As above, about 2 feet separation would be ideal for UHF freqs, and about 4 feet for VHF. Also, if the antenna(s) all have good solid connections to the body of the vehicle, (not mag mounts!) then the entire vehicle would act as the 'ground plane.' (it does not necessarily need to be an actual 'plane' or metal sheet just below the antenna, although that would be ideal, and why the optimal location for antennas is the vehicle roof!) If the antennas are mounted on separate body panels, (hood and trunk) it is often suggested that they be 'bonded' together. This is usually done by using flexible 3/4"-1" wide braid. for example, running a piece of braid from the hood hinge (or door hinge) to the body of the car; running braid from the trunk/hatch back to the body and not just relying on the hinge to maintain continuity.
Understood, maki sure there is a proper grounding of each antenna for the truck to act as the plain.
As far as the separation/distance is best at 4ft. I have considered mounting GMRS antennas on the roof plate, then a cb and ham antennas on opposite sides at the tailgate.
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To everyone that has pitched in with all the help, thank you! I am a newbie to anything but cb radio, old school.
Can I mount two different gmrs antennas on that same plate and switching out to radio as needed, being are both for the same frequency use?
Then mount a cb antenna on one side of the tailgate and a ham radio antenna to the other side to have all antennas/frequencies separated far enough anyway to alleviate or help with these issues?
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23 minutes ago, WSAM454 said:
If the antennas are mounted on separate body panels, (hood and trunk) it is often suggested that they be 'bonded' together. This is usually done by using flexible 3/4"-1" wide braid. for example, running a piece of braid from the hood hinge (or door hinge) to the body of the car; running braid from the trunk/hatch back to the body and not just relying on the hinge to maintain continuity.
The body of my truck is all aluminum alloy. Finding ground continuity can be a challenge. Could I use some10 awg or 18awg insulated wire to accomplish this?
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4 hours ago, WSAM454 said:
I imagine that the entire plate is something like 8x12 inches in size? If so, you might find that tuning the antennas will be difficult, since being so close to each other they might interact, even though they are on different frequencies. As far as use, I agree with kidphc; I would not be comfortable transmitting 20-40 Watts on one antenna while another radio (even on another band) antenna is so close. Possibly OK if only one radio was on at a time, but I would opt for putting only one antenna on that plate.
Also the cable you show in one photo looks to be a very small diameter. so hopefully it will be a very short run to the radio, since losses will be great.
That cable came with the NMO mount( Midland – MXTA24 Low Profile Antenna Cable with NMO Connector , https://a.co/d/2InzGkf ) It is being changed out for a different mount.
Do you have a nmo mount recommendation! -
3 hours ago, WRYZ926 said:
I totally missed the part about having two antennas. Not enough
. Half a wave length for 70cm band and GMRS is about 12 to 13 inches. Half a wave length of 2m band is around 40 inches. I am running a Comet SBB-1 dual band antenna and a Nagoya UT-72G GMRS antenna on top of my Ford Escape. The antennas are approximately 2 foot apart (full wave length for 70cm/GMRS). I haven't had any issues with that setup. I haven't tried having the antennas any closer than that.
So, with your antenna set up, any bleed over , one into another radio when tx?
A distance of 14”, but on the same plain, would be ok? -
3 hours ago, kidphc said:
Yes, it could. Especially, if the frequencies in use overlap or are harmonics.
Even if they aren't overlapping or harmonics of the same frequency, the fact they are close to each other will effect performance. Rule of thumb is try to keep separation of antennas at least one wavelength apart of the lowest.
You won't really know the effects till you try.
Sent from my SM-S901U using Tapatalk
What would be the least and ideal distance these antennas should be apart on a truck. I do have some optional mounts that can be placed on the fender/tailgate area. But these will not have any plane to work with.
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I’m intending to use this 3rd light antenna/led light mount/plate for many different antennas. (Pics below)
Will this plate work as properly as a flat solid metal plate used as a plain?(as I have heard of folks using a o sheet.
Next…will multiple antenna installed on this plate or a solid plate cause interference or feedback into a different radio in the same vehicle when multiple radio installed are on ion the same vehicle?UPDATE : Radios and antennas to be installed…
Radios being installed:
Radio 1: Abbree AR2520
https://a.aliexpress.com/_mMk93iwAntenna: Diamond Antenna SG-M507 Dual Band 144/430MHz Mobile Antenna
Radio 2: Wounxun KG-1000G-plus v1
Antenna: BROWNING 450MHz-470MHz UHF 3dBd Land Mobile NMO Antenna https://a.co/d/7fqbE76
or
Midland® MXTA25 3DB MicroMobile® Compatible Gain Ghost Antenna – 3.5” Tall with 1.5” Base Diameter – Low Profile GMRS NMO Connection https://a.co/d/jlFHsxJ
UPDATE ON PLATE SIZE
21” left to right
10.25” front to back
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Will a simple on/off toggle switch inline with the positive power wire alive this power draw issue?
Antenna plain…mobile solid or perforated?
in Technical Discussion
Posted · Edited by WSAZ909
I have these for interchangeable for different terrain/areas:
•Midland 5/8 wave mxta-25, 5/8 wave, 3db gain, nmo
•Browning 5/8 wave br-176s, 3db gain(tunable), nmo … not sure on the wave spec
•Midland mxta-26, 6 db gain, (tunable), nmo
probably going to get a 4 or 6” pvc pipe with bottom cap and top screw lid. for storing them in so they don’t receive damage when not in use.
Just received my kg-1000g today. Weather sux today, but hope to get it in truck later this week, run wires power/antenna, and check/tune swr.
I’m probably going to place my ham antenna at the back tailgate, I have left/right side mounts for ham/cb and center the gmrs mount on top of the roof.