[ARC5] What is a "radio range filter"?

[Brian]

As I understand it, the radio range filter is a passive, narrow-pass-band filter that increases the signal-to-noise ratio over a very specific band of audio frequencies, such as would be used in the A-N airfield landing path guidance system. This is not the glide path or slope system, but the azimuthal system. The filter is contained in a cast metal case about 3” x 2” x 2” and has a large operating knob on top.
It was issued ‘after market’ and was not part of the SCR-274-N kit. I have one available, if you’re interested.
73 de Brian, VK2GCE.

On Tuesday, April 26, 2016 10:51 PM, J McVey said:

I was reading the audio operation description on the SCR-274 manual pdf page 28, document page 16 . There, near the end of the first paragraph it say that for single place airplane, the "pilots headphone is plugged into Tel-A though a radio range filter, if used". No nomenclature given!  What is it and what what it's purpose?

I have heard that here was some kind of passive tone filter they used to use to narrow the audio response, but I have never seen such a device. Anybody know about it?
I was wondering if it might serve as a cw filter.
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