Jump to content


Photo

Help Improving Simplex Range Needed


Best Answer Corey , 14 March 2019 - 07:20 PM

Hello,  I am in a bit of a pickle today.  I am getting what I believe to be sub-par simplex performance with my new GMRS mobile radios.  Though, I may just be at the limit of the service.  I am hoping someone may have a recommendation or some information for me.

 

I have 2 trucks that I put Midland MXT400's in.  I am using the Midland 6 DB gain antenna.  Both antenna's are hard mounted to the windshield cowl, about 8 inches forward of the windshield and vertical.  The antenna base on one truck is 60 inches off the ground and the other antenna base is 54 inches off the ground. 

 

I have a UHF SWR/Watt meter.  Both vehicles are reading about 1.1:1-1.2:1 and there is zero reflective energy on either setup.

 

With both radios, I can successfully talk to repeaters 20+ miles away and they sound great.  On simplex, in as straight of a line as I can get on any road around here, I can only talk about 2.5 miles with 5 watts scale (3.7 measured).  When I bump the power to the 40 watts scale (35 measured), I don't pick up any more than 25 to 30 yards of more range.

 

I tried buying a couple of magnetic mount antenna bases and put both antenna's in the center of each vehicles roof and gain zero performance.  I also saw about the same forward and ref energy reading as well as SWR.

 

I am a HAM and on 440 (70cm), on a 5 watt hand held, I am getting about 7 miles on a 5 DB gain antenna.  With my 2m/440 setup in my car, I get about 17 miles on 440 simplex with 35 watts.  I am having a hard time believing that the small jump from 440's to 460's is crippling my simplex performance.  Especially since I am able to use repeaters 20+ miles away.

 

Any suggestions?  Is this what I should expect out of this part of the UHF band or am I overlooking something?  I feel like I am probably making a simple mistake and I am just missing it.

 

Thanks in advance for any help.

Marc

 

The MXT400 is narrow band and overall is not a great performer. I get 10 solid miles simplex on the highway using a Motorola XPR 5550 and a 1/4 wave thru mounted in the roof of a 2015 GMC pickup. The MTX400 and others in the lineup have been discussed in the equipment review section of this site.

 

truck3.jpg

Go to the full post


  • Please log in to reply
5 replies to this topic

#1 marcspaz

marcspaz

    Advanced Member

  • Members
  • PipPipPip
  • 192 posts
  • LocationLocation Location

Posted 14 March 2019 - 07:04 PM

Hello,  I am in a bit of a pickle today.  I am getting what I believe to be sub-par simplex performance with my new GMRS mobile radios.  Though, I may just be at the limit of the service.  I am hoping someone may have a recommendation or some information for me.

 

I have 2 trucks that I put Midland MXT400's in.  I am using the Midland 6 DB gain antenna.  Both antenna's are hard mounted to the windshield cowl, about 8 inches forward of the windshield and vertical.  The antenna base on one truck is 60 inches off the ground and the other antenna base is 54 inches off the ground. 

 

I have a UHF SWR/Watt meter.  Both vehicles are reading about 1.1:1-1.2:1 and there is zero reflective energy on either setup.

 

With both radios, I can successfully talk to repeaters 20+ miles away and they sound great.  On simplex, in as straight of a line as I can get on any road around here, I can only talk about 2.5 miles with 5 watts scale (3.7 measured).  When I bump the power to the 40 watts scale (35 measured), I don't pick up any more than 25 to 30 yards of more range.

 

I tried buying a couple of magnetic mount antenna bases and put both antenna's in the center of each vehicles roof and gain zero performance.  I also saw about the same forward and ref energy reading as well as SWR.

 

I am a HAM and on 440 (70cm), on a 5 watt hand held, I am getting about 7 miles on a 5 DB gain antenna.  With my 2m/440 setup in my car, I get about 17 miles on 440 simplex with 35 watts.  I am having a hard time believing that the small jump from 440's to 460's is crippling my simplex performance.  Especially since I am able to use repeaters 20+ miles away.

 

Any suggestions?  Is this what I should expect out of this part of the UHF band or am I overlooking something?  I feel like I am probably making a simple mistake and I am just missing it.

 

Thanks in advance for any help.

Marc



#2 Corey

Corey

    Advanced Member

  • Members
  • PipPipPip
  • 305 posts
  • LocationWisconsin
  • GMRS Callsign:WQVA593
  • Ham Callsign:KD9HCW

Posted 14 March 2019 - 07:20 PM   Best Answer

Hello,  I am in a bit of a pickle today.  I am getting what I believe to be sub-par simplex performance with my new GMRS mobile radios.  Though, I may just be at the limit of the service.  I am hoping someone may have a recommendation or some information for me.

 

I have 2 trucks that I put Midland MXT400's in.  I am using the Midland 6 DB gain antenna.  Both antenna's are hard mounted to the windshield cowl, about 8 inches forward of the windshield and vertical.  The antenna base on one truck is 60 inches off the ground and the other antenna base is 54 inches off the ground. 

 

I have a UHF SWR/Watt meter.  Both vehicles are reading about 1.1:1-1.2:1 and there is zero reflective energy on either setup.

 

With both radios, I can successfully talk to repeaters 20+ miles away and they sound great.  On simplex, in as straight of a line as I can get on any road around here, I can only talk about 2.5 miles with 5 watts scale (3.7 measured).  When I bump the power to the 40 watts scale (35 measured), I don't pick up any more than 25 to 30 yards of more range.

 

I tried buying a couple of magnetic mount antenna bases and put both antenna's in the center of each vehicles roof and gain zero performance.  I also saw about the same forward and ref energy reading as well as SWR.

 

I am a HAM and on 440 (70cm), on a 5 watt hand held, I am getting about 7 miles on a 5 DB gain antenna.  With my 2m/440 setup in my car, I get about 17 miles on 440 simplex with 35 watts.  I am having a hard time believing that the small jump from 440's to 460's is crippling my simplex performance.  Especially since I am able to use repeaters 20+ miles away.

 

Any suggestions?  Is this what I should expect out of this part of the UHF band or am I overlooking something?  I feel like I am probably making a simple mistake and I am just missing it.

 

Thanks in advance for any help.

Marc

 

The MXT400 is narrow band and overall is not a great performer. I get 10 solid miles simplex on the highway using a Motorola XPR 5550 and a 1/4 wave thru mounted in the roof of a 2015 GMC pickup. The MTX400 and others in the lineup have been discussed in the equipment review section of this site.

 

truck3.jpg


  • marcspaz likes this

Just My $.02

 

Corey

 

Midwest GMRS

https://mwgmrs.com


#3 marcspaz

marcspaz

    Advanced Member

  • Members
  • PipPipPip
  • 192 posts
  • LocationLocation Location

Posted 14 March 2019 - 08:27 PM

The MXT400 is narrow band and overall is not a great performer. I get 10 solid miles simplex on the highway using a Motorola XPR 5550 and a 1/4 wave thru mounted in the roof of a 2015 GMC pickup. The MTX400 and others in the lineup have been discussed in the equipment review section of this site.

 

 

 

That's bad news and a serious oversight on my end.  I can't believe I missed that.  Midland micromobile came up in the top 5 recommended GMRS radios is a bunch of online reviews.

 

Is there any options other than selling this radios and buying a pair of widebands?



#4 Corey

Corey

    Advanced Member

  • Members
  • PipPipPip
  • 305 posts
  • LocationWisconsin
  • GMRS Callsign:WQVA593
  • Ham Callsign:KD9HCW

Posted 14 March 2019 - 09:12 PM

That's bad news and a serious oversight on my end.  I can't believe I missed that.  Midland micromobile came up in the top 5 recommended GMRS radios is a bunch of online reviews.

 

Is there any options other than selling this radios and buying a pair of widebands?

 

Not really, you can fight Midland to take them back as others have.


Just My $.02

 

Corey

 

Midwest GMRS

https://mwgmrs.com


#5 Elkhunter521

Elkhunter521

    Advanced Member

  • Members
  • PipPipPip
  • 173 posts
  • LocationWashougal Washington
  • GMRS Callsign:Ask

Posted 14 March 2019 - 11:34 PM

I have 2 Midland MXT radios, (275 & 400). I belive the reason that Midland MXT radios score high on GMRS mobile reviews is there are few, if any other FCC type 95 mobiles out there.
Be vewy vewy quiet.
I'm listening to my wadio!

#6 marcspaz

marcspaz

    Advanced Member

  • Members
  • PipPipPip
  • 192 posts
  • LocationLocation Location

Posted 14 March 2019 - 11:40 PM

Not really, you can fight Midland to take them back as others have.

 

 

I appreciate the info.  Much appreciated.

 

 

I have 2 Midland MXT radios, (275 & 400). I belive the reason that Midland MXT radios score high on GMRS mobile reviews is there are few, if any other FCC type 95 mobiles out there.

 

 

That actually makes a lot of sense.  I appreciate it.






0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users