RadioReference on Facebook   RadioReference on Twitter   RadioReference Blog
 

Go Back   The RadioReference.com Forums > Topic Specific Forums > Antennas and Associated Hardware > Scanner / Receiver Antennas

Scanner / Receiver Antennas For discussion of any type of receiving antenna used by a scanner or receiver base, mobile or handheld.

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
  #1 (permalink)  
Old 03-27-2012, 10:50 PM
Member
   
Join Date: Mar 2012
Location: Ellicottville, NY
Posts: 3
Default Need short mobile scanner antenna with good low band performance

My title pretty much says it all. I have to magnet mount an "all band" antenna to my roof. My criteria are:
-Low band (46 MHZ area) prime concern
-High band (145 MHZ area) secondary concern
-Other frequencies will be listened to as well, but not as critical
-Fairly short (ideally under 20 inches)
-Magnet mount (or NMO / Thread that I an get a magnet mount base for)
-Ideally one I can unscrew from the magnet mount base for parking garages when needed
-Good quality / long lasting / won't corrode (live in north east, winter is hard on equipment)

Suggestions?
Reply With Quote
Sponsored links
  #2 (permalink)  
Old 03-28-2012, 8:08 AM
Rt169Radio's Avatar
Member
  Premium Subscriber
Premium Subscriber
 
Join Date: Aug 2011
Location: Connecticut
Posts: 2,722
Default

Well the only short NMO antenna that I can think of would be the Larsen tri-band antenna with the coverage of 150/450/800 MHz.The antenna is 17 inches tall and is built quite sturdy.
__________________
My Equipment & Bio- http://www.radioreference.com/apps/user/Rt169Radio/bio
Reply With Quote
  #3 (permalink)  
Old 03-28-2012, 8:38 AM
Wiki Admin Emeritus
  Amateur Radio Operator
Amateur Radio
 
Join Date: Jul 2002
Location: Bowie, Md.
Posts: 17,895
Default

A better choice would be the Austin Spectra. Expensive but well worth it. You can cut the top whip with a hacksaw to improve the low-band performance (there's a chart in the wiki for this).

I have it on a heavy duty NMO trunk mount and it works very well. I can hear Baltimore county's 46 mhz fire dispatch on the DC beltway - a distance of about 30 miles. Pretty darn good for a 2 foot whip with coils. It's scratchy, to be sure, but perfectly audible. Just make sure your mount is well grounded - the antenna needs it. A quick check with a cheap VOM will do the job.

HTH...Mike
__________________
links editor, Utility Monitoring Central
HF Forum moderator, RadioReference
Friends don't let friends buy Scancat Lite Plus!
Reply With Quote
  #4 (permalink)  
Old 03-28-2012, 9:25 AM
Member
   
Join Date: Mar 2012
Location: Ellicottville, NY
Posts: 3
Default

Quote:
Originally Posted by Rt169Radio View Post
Well the only short NMO antenna that I can think of would be the Larsen tri-band antenna with the coverage of 150/450/800 MHz.The antenna is 17 inches tall and is built quite sturdy.
That is the antenna I was looking at. My concern is there are no low bands (46 MHZ area) listed for this. Does anybody have any experience with the Larson tri-band and those frequencies?

I do need some even lower frequencies (in the 34 MHZ area) but I have a two way Motorola Radius for most of those that I need.
Reply With Quote
  #5 (permalink)  
Old 03-28-2012, 10:05 AM
Member
  Premium Subscriber
Premium Subscriber
Amateur Radio Operator
Amateur Radio
 
Join Date: Apr 2003
Location: Sand Springs OK
Posts: 650
Default

For $24 plus shipping, you could get a Hustler VHF 1/4-wave (~19") that will meet your needs very well. I have one that receives lowband (44MHZ) very well and will also do VHF-hi and UHF.

Link: AES Price list
Reply With Quote
Sponsored links
        
  #6 (permalink)  
Old 03-28-2012, 4:02 PM
Member
  Premium Subscriber
Premium Subscriber
 
Join Date: Jun 2006
Posts: 3,576
Default

Several people responding are not reading that the OP needs VHF low band and the Austin Spectra is the only antenna currently made that will suit your needs.

The low band performance is somewhat compromised but about as good as it gets for something that size. It comes from the factory tuned to about 33MHz and you need to trim it for higher freqs or the efficiency will fall into the toilet.

I have several Larsen tri-band antennas and they do not cover VHF lo band.
prcguy
Reply With Quote
  #7 (permalink)  
Old 03-28-2012, 9:21 PM
Member
  Premium Subscriber
Premium Subscriber
Amateur Radio Operator
Amateur Radio
 
Join Date: Apr 2003
Location: Sand Springs OK
Posts: 650
Default

Quote:
Originally Posted by prcguy View Post
Several people responding are not reading that the OP needs VHF low band and the Austin Spectra is the only antenna currently made that will suit your needs.
Then we're all equal since you didn't read his ideal length of 20" or less. Anything is going to be a compromise, given the electrical realities of how frequency and length interact. My suggestion was something that met his ideal length requirement that I knew was capable of performing because I had experienced it personally.
Reply With Quote
  #8 (permalink)  
Old 03-28-2012, 9:50 PM
Member
  Premium Subscriber
Premium Subscriber
 
Join Date: Jun 2006
Posts: 3,576
Default

I missed the part about 20" or less, sorry.

OK, I'm really not sorry, so getting back to his VHF lo band needs a Larsen tri-band or a 19" whip is going to be a good 20-30dB down in reception compared to an Austin Spectra within its lo band sweet spot.

I did a series of measurements with the Austin Spectra and other antennas across the 27-512MHz range and have seen how bad VHF lo band reception can be without an antenna that's tuned for that band.
prcguy

Quote:
Originally Posted by N5TWB View Post
Then we're all equal since you didn't read his ideal length of 20" or less. Anything is going to be a compromise, given the electrical realities of how frequency and length interact. My suggestion was something that met his ideal length requirement that I knew was capable of performing because I had experienced it personally.
Reply With Quote
  #9 (permalink)  
Old 03-28-2012, 10:00 PM
RadioDaze's Avatar
Member
  Premium Subscriber
Premium Subscriber
 
Join Date: Oct 2006
Location: Orange County, California, USA
Posts: 1,950
Default

I find that the Comtelco PEXL36 BNX (BNC connector) from RFWiz
Comtelco Portable Rubber Duck Antenna Information Page 1
works very well for its short size, with the caveat that it's not waterproof. And you'll need some array of adapters to get from one of the mounts to an NMO.
__________________
"'Anybody with fewer radios than me is a loser; anyone with more is a lunatic' may be the quote of the year." -datainmotion
Reply With Quote
Sponsored links
  #10 (permalink)  
Old 03-28-2012, 10:46 PM
gewecke's Avatar
Member
  Premium Subscriber
Premium Subscriber
Amateur Radio Operator
Amateur Radio
 
Join Date: Jan 2006
Location: Illinois
Posts: 5,793
Thumbs up

Quote:
Originally Posted by bernie530 View Post
My title pretty much says it all. I have to magnet mount an "all band" antenna to my roof. My criteria are:
-Low band (46 MHZ area) prime concern
-High band (145 MHZ area) secondary concern
-Other frequencies will be listened to as well, but not as critical
-Fairly short (ideally under 20 inches)
-Magnet mount (or NMO / Thread that I an get a magnet mount base for)
-Ideally one I can unscrew from the magnet mount base for parking garages when needed
-Good quality / long lasting / won't corrode (live in north east, winter is hard on equipment)

Suggestions?
Bernie, please keep in mind that almost no magnetic antenna under 20" tall is going to give you satisfactory performance on the vhf low band simply because it's not going to be resonant at that length. Vhf hi band is doable however. Some may give you suggestions, but generally speaking, you'll need a longer antenna for the vhf low band.
The lower in frequency,the longer the antenna needs to be. The vice versa is true for UHF; a short 6" for a quarter wave.


73,
n9zas
__________________
"Whatever doesn't kill you...will make you stronger"!
Reply With Quote
  #11 (permalink)  
Old 03-28-2012, 11:36 PM
Member
  Shack Photos
Shack photos
 
Join Date: Nov 2010
Location: Maquoketa,IA
Posts: 5
Default mobile scanner ant.

Here is link to the one i use for my scanners it works well its 17" long it is a wide band 25-1300Mhz

https://www.scannermaster.com/Wideba.../01-541326.htm
Reply With Quote
  #12 (permalink)  
Old 04-01-2012, 10:31 AM
Member
   
Join Date: Mar 2012
Location: Ellicottville, NY
Posts: 3
Default Mon 52?

There is an Antenna Specialist Mon 52 for sale on eBay. I am wondering if anyone has the original directions for that antenna? Specifically, do I cut it down to perform best at the 46 MHZ range. If so, how much? I am looking for overall height when cut down to the 46 MHZ range. Thanks.
Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -5. The time now is 9:00 AM.


Powered by vBulletin® Version 3.8.2
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
All information here is Copyright 2012 by RadioReference.com LLC and Lindsay C. Blanton III.Ad Management by RedTyger
Copyright 2011 by RadioReference.com LLC Privacy Policy  |  Terms and Conditions