[Boatanchors] FL-5-F

[D C _Mac_ Macdonald]

Is it a smallish diecast aluminum box with a three-position switch? If so, it's most likely an audio pass and/or reject audio filter centered on 1020 Hz. Used in WW II and Korea vintage military aircraft.
 
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* 73 - Mac, K2GKK/5 * 
* (Since 30 Nov 53) * 
* k2gkk hotmail com * 
* Oklahoma City, OK * 
* USAF & FAA (Ret.) * 
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> From: elespe at lisco.com
> To: boatanchors at mailman.qth.net
> Date: Thu, 14 Aug 2014 20:22:12 -0500
> Subject: [Boatanchors] FL-5-F
> 
> Filter FL-5-F
> Can anyone tell me what it is supposed to be?
> Thanks
> Paul K0UYA