49.7582MHz - Shimanovsk?

I ran `HROFFT' at 0857--1310JST (2357--0410z) on 2002 APR 14 to measure its frequency with meteor scatter propagation. Large number of echoes were recorded at almost the same frequency, about 49.758 12-14MHz.

Next, I will wait for a long echo and measure its more precise frequency.

Number of Echoes

Pictures of HROFFT

On HROFFT

I set the passband of HROFFT to 950--1070Hz (the white line at the frequency scale).

The signal strength of this passband is shown at the bottom of the window. The white horizontal lines are SNR 10, 20, 30dB from the bottom. HROFFT counts the number of `strong' (S/N > 10dB) signals. They are drawn in yellow.

You can see a explanation how to read the picutres of HROFFT
in English or in Japanese.

A free software HROView (written in Japanese) for Windows is very usuful for reading the pictures.

0950--1000 JST

This is not good example. I found that when my computer display was connected to my 1st computer, large noise was recorded.

2002 APR 14 0950JST (RX: 49.7572MHz USB)

7 pings.

The frequency was calibrated at 0958 JST.

1000--1010 JST

2002 APR 14 1000JST (RX: 49.7572MHz USB)

4 clear pings, and a `split' ping (E).

The frequency was calibrated at 0958 JST.

1020--1030 JST

2002 APR 14 1020JST (RX: 49.7572MHz USB)

A very long echo and 7 clear pings

I calibrated the frequency of FT-847 at 0958JST (more than 20min. before) and took a rest for a while... Therefore the `true' frequencies in the list are not so accurate.

1300--1310 JST

2002 APR 14 1300JST (RX: 49.7572MHz USB)

About 10 clear pings.

The frequency was calibrated 1311JST.

TOPEmail to Kunihiko Nakano(c) OCT 28, 2010