RV Service Net Reception at WA5MLF

During the last half-hour of yesterday's RV Service Net the signal from W4UOA was solid at Baton Rouge. The distance from my station to W4UOA is 430 miles.

Below is a screen shot captured at 0751 CDT, while W4BXI was transmitting on 7191 kHz  from W4UOA. Another strong signal can be seen below 7188 kHz.

Click to enlarge view.

A little earlier (0728 CDT) I recorded KB0BH checking into the Net and acknowledged by W4BXI. The recording (click here) was made from my Flex-3000 transceiver in Baton Rouge.

73,
John WA5MLF

SDR Screen Shots of Received Voice Transmissions

During this morning's QSO on 3740 kHz, Jim K4JPM shared his Flex Radio screen via Google Hangout. He had good reception of the lower sideband voice transmissions from W4BXI and W4UOA. The screen shots below show an abnormal property of each signal. Jim activated the peak mode on his receive display to hold the peak value at each frequency over a period of many seconds of voice transmission. The displays show a panadapter view (amplitude vs frequency) on top with a waterfall display (amplitude [brightness] vs frequency and time) below. The light-shaded box on the panadapter indicates the receiver's audio bandwidth setting. Signals outside of this box are not heard in the speakers.

W4BXI signal at K4JPM

Above is the view of W4BXI's signal on Jim's Flex Radio. Click on the image for a full-size view. The notable detail here is the presence of carrier at 3740 kHz (red vertical line). The LSB voice band shows the fairly typical male voice with more energy at the lower audio frequencies.

W4UOA signal at K4JPM

Above is the view of W4UOA's signal on Jim's Flex Radio. Click on the image for a full-size view. Note the presence of energy in the upper sidebands (to the right of the red line).

- John WA5MLF

Spectrum waterfall views on 60 m

During this morning's QSO I captured screen shots of the waterfall display of received signals on my Flex-3000. Below are the views with stations identified, as heard during the 0755 to 0810 CST time frame. (Click on any image for a larger view.)

Above is the display while WA4PTZ was transmitting. The vertical dimension is about 30 seconds of elapsed time. The 60 m channel 1 bandwidth is represented by the gray shading on the top edge. The carrier frequency is marked with a red line. The lighter patches show the received SSB signal level compared with background noise. Some persistent signals (or artifacts) are seen around 5.328 MHz.

Above is the signal display for W4PRE.

Here is the signal view for W4UOA.

Above is a view showing transmissions from KB4XX and W4UOA.

Here is a longer transmission from KB4XX.


For a different view, see the screen shot below from 40 m (7.143 MHz) at about the same time of the previous morning. This shows transmission from KB4PYR with a strong QSO in progress "next door" at 7.140. The yellow and red colors signify much stronger received signals, compared with the 60 m views above.

-- John