[Milsurplus] Antenna Question

[J. Forster]

Yes. I seem to remember the -B instructions packed w/ the antenna
mentioned drilling holes in the elements to attach the struts.

Thanks,
-John

========

> The manuals says that the AN-147-B was modified with struts and stiffener
> plates and that there was a modification kit to convert the -A essentially
> to
> a -B to prevent damage to the antenna and aircraft due to parts falling
> off
> in flight.  The -B and/or kit are not shown in the 3/44 Operator's Manual
> and are in the 9/44 edition.
>
> In a message dated 8/2/2009 1:28:00 PM Central Daylight Time,
> jfor at quik.com
> writes:
>> There are two Yagi antennas listed for the SCR-729-A and AN/APN-2
>> (Rebecca) systems. They are the AN-148-A and AN-148-B.
>>
>> I believe they are essentially identical, except the -B version has
>> diagonal Bakelite struts to mechanically stiffen the Yagi elements.
>>
>> Does anyone know if that is the reason for the struts and if so, when
>> and
>> why it was done? Was it because of elements breaking off on higher speed
>> aircraft later in the war? I can see that the elements could well fail
>> because of metal fatigue, excited by airflow. The elements are airfoil
>> shaped as I remember.
>>
>
> Robert Downs - Houston
> wa5cab dot com (Web Store)
> MVPA 9480
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