[ARC5] [Milsurplus] F-90/AIC

[Michael Bittner]

Mike,
Thanks for your help on the F-90 filter.  Your tip on the AN/AIC-8 led me to 
the AM-476C/AIC-10 which confirms that the input and output impedances must 
be 150 Ohms as also indicated by Scott W7SVJ in another reply to my query. 
Your tip also led me to a source for the Mil Spec for the F-90, but they 
want $25 for a copy and then there is no guarantee that the spec will 
include a schematic, so I'm not yet ready to bite on the spec. Thanks, but I 
have no need for the AM-142.
Mike, W6MAB




----- Original Message ----- 
From: "Mike Hanz" <aaf-radio-1 at aafradio.org>
To: "Michael Bittner" <mmab at cox.net>; <milsurplus at mailman.qth.net>
Cc: <arc5 at mailman.qth.net>
Sent: Sunday, June 21, 2015 5:30 AM
Subject: Re: [Milsurplus] F-90/AIC


> On 6/20/2015 10:23 PM, Michael Bittner wrote:
>> Does anyone have, or know a source of, a schematic diagram and input and 
>> output impedances of the F-90/AIC range/beam audio filter?
>>
>> All of its filter elements are contained in a small hermetically sealed 
>> module.  I have several of these modules (they look like a typical mil 
>> spec audio transformer) and would like to put them to use, but I'm not 
>> sure of the pinouts on these modules.
>>   I have one complete F-90/AIC and have tried to reverse engineer it, but 
>> trying to follow the wiring between the filter module and the selector 
>> switch and between the several wafers on the selector switch is worse 
>> than an enigma machine.  And in any case, I don't know the connector 
>> pinouts for the complete unit.  There is plenty of information on the 
>> FL-5 and FL-8 filters on the web, but I find nothing on the F-90.  Help 
>> anyone?
>
> No help on the schematic, but you might look for info on the AN/AIC-8 of 
> which it was a component.
>
> 73,
> Mike
> 


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