[ARC5] FL-5-C BC-345

[MICHAEL BITTNER]

It's 1020 Hz, the 17th harmonic of 60 Hz.  Back in the day, the power line frequency was used as the reference frequency for the MCW transmissions of LF beacons and 4-course range stations. Does anyone on this list remember how to do a "Fade-90"? Mike, W6MAB


> On May 5, 2020 at 2:55 AM Roy Morgan <k1lky68 at gmail.com> 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
> 
> > 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.
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