[ARC5] ARN-6 in F-80 and F-86D

[Mike Hanz]

John has it exactly right.  The only other thought that is usually 
appended to an explanation of the sense antenna is that it removes the 
"ambiguity" of the normal figure eight pattern, which would leave you 
wondering which of the diametrically opposed directions indicated 
represent the "real" one.  Unfortunately the desired sharpness of the 
null is sometimes degraded by factors such as time of day, frequency, 
height of reception platform, strength of the station, and probably a 
couple of other elements I don't recall at the moment.  I've experienced 
some pretty broad nulls using a sense antenna with a loop...enough to 
make you scratch your head with wonderment...:-)

Mike  KC4TOS

On 7/3/2013 9:19 AM, jmfranke at cox.net wrote:

> The sense antenna is omnidirectional and the output is combined with the loop antenna output through a phase shift network to provide a cardiod pattern with one sharp null and one broad peak instead of the normal loop antenna figure eight pattern which has two sharp nulls and two peaks.
>
> John  WA4WDL
>
>
> ---- Robert  Eleazer <releazer at earthlink.net> wrote:
>> I have the pilot's manual on the F-80 and it shows the dome for the ARN-6 antenna was mounted in that black radome area are at the upper tip of the nose.  On the F-80A-1 there was a landing light in that spot; the aircraft had a BC-1206 but no ARN-6 or -7.  The T-33 installation was similar to the F-80.
>>
>> In the top of the bubble canopy on the F-80 there was the "sense" antenna for the ARN-6.
>>
>> Just what is a "sense antenna" anyway?
>>
>> On the F-86D the ARN-6 antenna dome was under the canopy aft of the pilot.
>>
>> Wayne
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