WWV format

SWLing Post reader, George (NJ3H), writes:

I quite often see a spike in the evening on 4996 khz. From the listing, this is suppose to be RWM, in Moscow, a time signal station.

When I listen on remote receivers in Poland and Denmark, I do not hear time pips, but rather just hash.

On my Perseus, I can watch the spike go up and down each second. This makes me think it is caused by WWV. However, the 29th second seems to make the spike move up, even though WWV doesn’t have a pip at second 29. The remote receivers in Europe that I just mentioned do not have any time pips being broadcast. Does WWV cause a signal on 4996?

Can you shed any light on 4996? Should we be able to hear RWM in the Eastern US?

Good question, George, and I’m hoping a reader can shed some light on what you’re seeing on the spectrum display. I’m not sure what could be causing the 29th second spike unless it’s WWV transmitting a sub-audible tone.