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Old November 30th 05, 03:20 AM posted to rec.radio.scanner
 
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Default 40 Mhz mobile

Looking for recommendations on mobile antenna setup (external) for CHP
frequencies,
40-42Mhz area.


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Old December 1st 05, 05:03 AM posted to rec.radio.scanner
Al Klein
 
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Default 40 Mhz mobile

On 29 Nov 2005 18:20:41 -0800, "
wrote:

Looking for recommendations on mobile antenna setup (external) for CHP
frequencies,
40-42Mhz area.


Trunk or fender mounted whip, full quarter wave. At that frequency
there's no reason not to - it's only 6 feet.
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Old December 1st 05, 02:36 PM posted to rec.radio.scanner
 
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Default 40 Mhz mobile

i bought this and it works great, 18" on the trunk lid

http://cgi.ebay.com/ws/eBayISAPI.dll...m=5815661 001

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Old December 1st 05, 03:05 PM posted to rec.radio.scanner
Dale Parfitt
 
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Default 40 Mhz mobile


wrote in message
ups.com...
i bought this and it works great, 18" on the trunk lid

http://cgi.ebay.com/ws/eBayISAPI.dll...m=5815661 001


The advice of the full quarter wave ( just under 6') is spot on. This will
give you the maximum bandwidth and gain of any moble antenna you could use
at 40 MHz.

The above EBay antenna (even if it were set up for VHF Low, which it does
not appear to be) would be a real compromise in gain and BW.

Dale W4OP


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Old December 5th 05, 02:38 AM posted to rec.radio.scanner
OregonMike
 
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Default 40 Mhz mobile

On Thu, 01 Dec 2005 14:05:23 GMT, "Dale Parfitt"
wrote:


The advice of the full quarter wave ( just under 6') is spot on. This will
give you the maximum bandwidth and gain of any moble antenna you could use
at 40 MHz.



Whereas there's no gain involved with a 1/4 wave vertical per se
(unless referenced to a crap antenna like that on ebay), the 1/4 wave
vertical is "spot on" as Dale mentions. It'll also be resonant on
your desired reception freq. which does matter a lot with unbalanced
systems like that.

The above EBay antenna (even if it were set up for VHF Low, which it does
not appear to be) would be a real compromise in gain and BW.

Dale W4OP


Dale's spot on here as well. When you sacrifice proper antenna length
(still speaking of unbalanced verticals) with tuning networks, you're
going to get a performance hit that is often not worth the trouble or
money.


OM




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Old December 9th 05, 08:49 PM posted to rec.radio.scanner
 
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Default 40 Mhz mobile

Ok, sounds great. I'll go for it.

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Old December 9th 05, 08:51 PM posted to rec.radio.scanner
 
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Default 40 Mhz mobile

Also, I did notice that CHP units have roof mounted 6-footers. They are
very thin and you usually do not notice them unless you really look.
Does anyone know the manufacturer of the CHP auto antennas ?



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