[ARC5] Harvey-Wells AR-3a

[MICHAEL BITTNER]

Eldon,

Thanks for your reply. I have the Airadio and the Sams schematic for it. Very interesting radio with a Twin-T, RC audio rejection filter for 1020 kHz when VOICE is selected, but no bandpass filter for 1020 when RANGE is selected. All the RANGE position does is ground the AGC while all audio comes through, same as when TOWER is selected.

Since the Airadio's chassis layout and coil construction are different from the AR-3A, I just thought there might be some difference in the circuitry.

73, Mike

> On August 26, 2020 at 12:16 PM elden meyer via ARC5 <arc5 at mailman.qth.net> wrote:
> 
>     Good Morning Mike,
> 
>     You might look at the Airadio model SU-41D light aircraft receiver. 
> 
>     Information is available at: 
>     https://www.radiomuseum.org/r/airadio_su_41d.html https://www.radiomuseum.org/r/airadio_su_41d.html    
> 
>     This also uses 1.4 volt loctal tubes. Gain is controlled by adjusting 
>     the screen voltage, and audio filtering by an RC network. 
> 
>     Elden 
> 
> 
> 
> 




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