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

[J. Forster]

My understanding of the pattern of a loop alone in free space is a
figure-8 with both nulls in the plane of the loop.

Adding in the sense antenna, degrades one of those nulls, (and possibly
improves the depth of the other) by adding in a roughly omnidirectional
signal.

Is that what you mean?

-John

================




> 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
>>> ______________________________________________________________
>>> ARC5 mailing list
>>> Home: http://mailman.qth.net/mailman/listinfo/arc5
>>> Help: http://mailman.qth.net/mmfaq.htm
>>> Post: mailto:ARC5 at mailman.qth.net
>>>
>>> This list hosted by: http://www.qsl.net
>>> Please help support this email list: http://www.qsl.net/donate.html
>> ______________________________________________________________
>> ARC5 mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/arc5
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:ARC5 at mailman.qth.net
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>>
>>
>
> ______________________________________________________________
> ARC5 mailing list
> Home: http://mailman.qth.net/mailman/listinfo/arc5
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:ARC5 at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>
>