[ARC5] FL-5-C BC-345

[Richard Knoppow]

   I wrote earlier that the frequency was 1200 Hz. Its 1020Hz my 
mind flopped the numbers. I used to hear the crossed loop range 
stations on the 200 to 400 Khz band. Also NDBs a few of which had 
automated weather reports on them. The NDB at Los Angeles 
International with the TWEB on it was LAX then changed call to 
IGD (Inglewood) and LAX moved to another frequency. I have no 
idea of why this was done. The station ID was continuous morse at 
1020Hz.

On 5/4/2020 11:55 PM, Roy Morgan wrote:
> 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
>

-- 
Richard Knoppow
1oldlens1 at ix.netcom.com
WB6KBL