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wingtip vor antenna - SWR Meter

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JLuckey(at)pacbell.net
Guest

Posted: Wed Mar 21, 2012 1:35 pm Post subject: wingtip vor antenna - SWR Meter

Can this radio shack be used for aviation comm radios?



http://www.radioshack.com/product/index.jsp?productId 36239



(at < $40, the price is sure right)



IIRC, CB's are around 27 Mhz & airplane radios operate 118-136 Mhz.  Is that

a problem?





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Float Flyr

Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland

Posted: Wed Mar 21, 2012 2:45 pm Post subject: wingtip vor antenna - SWR Meter

Yes, it is a problem the diodes in this meter are not nearly fast enough to

break the RF (Radio Frequency) of VHF into digital segments needed to

measure SWR.  This unit is usable for frequencies 30 mHz and below.

You may find a serviceable meter on eBay.  If you buy a Bird Wattmeter make

sure the element for 100-250 mHz comes with it.



Noel



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_________________
Noel Loveys
Kitfox III-A
Aerocet 1100 Floats

nuckolls.bob(at)aeroelect
Guest

Posted: Wed Mar 21, 2012 4:09 pm Post subject: wingtip vor antenna - SWR Meter

At 05:42 PM 3/21/2012, you wrote:

  	  Quote: 	
		  --> AeroElectric-List message posted by: "Noel Loveys" <noelloveys(at)yahoo.ca>



 Yes, it is a problem the diodes in this meter are not nearly fast enough to

 break the RF (Radio Frequency) of VHF into digital segments needed to

 measure SWR.  This unit is usable for frequencies 30 mHz and below.

 You may find a serviceable meter on eBay.  If you buy a Bird Wattmeter make

 sure the element for 100-250 mHz comes with it. 	


   The Bird products are the gold standard for

   RF wattmeters. A few months ago we had some

   discussion on the List about the HF SWR

   meters common to CB radio frequencies and

   below. These are not suited to VHF as their

   sampled transmission line is too long with

   respect to a wavelength at the frequencies

   of interest for VHF. They tend to give 'good'

   readings to poor antennas.



   We also had some discussions about this device:



 [img]cid:7.1.0.9.0.20120321190040.01dfbec0(at)aeroelectric.com.0[/img] 



   Which you can get off eBay for about $60 postage paid.



  http://tinyurl.com/7cl4bba 



   I purchased one of these and found it a quite good

   value. Reasonably accurate for power readings down

   into the 100 milliwatt range. 



   The one I have here on my bench is spoken for and

   will be out of here next week . . . but the folks

   offering it on eBay have plenty more. Be sure to

   get two N-Male/BNC-Female adapters.



 [img]cid:7.1.0.9.0.20120321190040.01dfbec0(at)aeroelectric.com.1[/img] 



  http://tinyurl.com/6m7ujmw 



 

   These are about $2.50 each postage paid.



   Bob . . .

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nuckolls.bob(at)aeroelect
Guest

Posted: Thu Mar 22, 2012 1:48 pm Post subject: wingtip vor antenna - SWR Meter

At 01:52 PM 3/22/2012, you wrote:

  	  Quote: 	
		  Reading the page on this meter I assume it is not a good meter for use on RF below 100mHz. 	


   It's accuracy will degrade as you depart the

   manufacturer's specified range of performance.



   If you buy a 'slug' for a Bird wattmeter



 [img]cid:7.1.0.9.0.20120322164307.0467ecc0(at)aeroelectric.com.2[/img] 



   It is characterized for a power level and a

   range of frequencies for which it will meet

   the manufacturer's specs for accuracy.



   The 'Red Dot' SWR meter is simply a power

   meter with a 'fixed slug'.



 

 

   Bob . . .

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