[ARC5] FL-5-C BC-345

[Roy Morgan]

I have an FL-5 here, it is working fine, though I have not measured it's peak frequency. 
My FL-5 and LM-20 are just as old as I am!

The radio range beacons, with four courses detected by equal strengths of A and N modulation did use 1200 cps (Hertz) modulation. The good information at K4CHE.com confirms this. The FL-5 (and FL-8) filters were used for the A-N radio range air navigation system. 

But non-directional beacons (NDB's) have Morse ID letters sent with 400 or 1020 cps.  I think US beacons used the 1020 cps frequency and Canadian ones used 400 cps.

 One trick to identify a US and Canadian NDB both on the same carrier frequency was to listen to the modulation side bands with a very narrow receiving filter. 

Roy Morgan
K1LKY Western Mass

> On May 5, 2020, at 1:28 AM, Richard Knoppow <1oldlens1 at ix.netcom.com> wrote:
> 
>    I am pretty sure the frequency is 1200 Hz. These were give aways at surplus stores when I was a kid.