[MRCA] Code Wheel

[Mark K3MSB]

Hi Jeep

I have run into the extra dit to indicate a backup transmitter several
times while monitoring NDBs.   Here's a DSP decode of NAS 270 Kc in Chile:

[image: image.png]

I've caught this several times, some with and some without the extra dit.

73 Mark K3MSB


On Sat, Aug 24, 2024 at 2:08 PM Jeep Platt <jeepcomms at outlook.com> wrote:

> Actually,  common item back aways. On each airways NDB, whether Compass
> Locator, L, M, H, or HH power level, there was a keyer unit that had an
> installed code wheel. FAA spares were mechanically set for the station
> ident, typically 3 letters. If the navaid was switched to the back-up
> transmitter, and extra, delayed dit was added. Our ident was SWA (Swan
> Island HH).  The tone ident was impressed on the CW carrier in AM at 1020
> Hz.  Probably typical of all such beacons, aero or marine.
> Jeep K3HVG
>
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