Here are some annotated screenshots that show some features of the app as seen on an iPad. This user interface is nearly identical to the interface on a desktop or laptop computer. Click on each image to view full size.
John
The Bell Ringers are a group of active and retired ham employees of the telephone industry, plus some ham friends with a mutual interest. They comprise a non-message network to meet regularly on the air to provide an exchange of communications and continuing fellowship within our area. To visit the Bell Ringers home page, click here
Here are some annotated screenshots that show some features of the app as seen on an iPad. This user interface is nearly identical to the interface on a desktop or laptop computer. Click on each image to view full size.
John
Below you can listen to an MP3 file of audio from my FLEX-3000 transceiver, recorded during the second hour of the RV Service Net. I
edited an 18-minute recording to remove long periods of no
usable signal. I left in a few short segments where a signal was marginal. The result is less than 15 minutes long.
While viewing the 40 m band with my SDRplay receiver I saw a strong ionosonde signal sweeping across the band, as shown in the above screenshot. The top part shows the signal on the panadapter view (horizontal axis is frequency, vertical axis is amplitude). The bottom part shows the waterfall display (horizontal axis is frequency, vertical axis is time, progressing downward). Signal amplitude is represented by brightness. The sweep shows here as a diagonal line. Other stations on the band are operating on fixed frequencies.
Data collected by the ionosondes around the world are publicly available. See my blog posting: Graphs of Maximum Usable Frequency from Ionosonde Data for more information. The collection and analysis of data from ionosondes is managed by the GLOBAL IONOSPHERE RADIO OBSERVATORY.
I captured a video of the SDRplay window that includes a sweep, as seen below. There is no sound in this recording. Normally one hears only a short chirp as the sweep passes through the receiver's audio bandwidth. On this view the 2.8 kHz audio bandwidth is the thin vertical column in the center. Other active signals on the band are seen as the up-and-down white vertical spikes.
W4BXI is using a custom circuit to interface an ordinary foot switch to the TX function of the RCForb client program on his Windows PC. We have observed occasional stuttering in his transmit audio during the first 2 seconds or so after the foot switch is pressed. Today I made a recording of his contact on 40 m, transmitting from W4UOA, with a Virginia station. The full 3.5 minute recording is available below for listening.
You can hear the audio stutter just past at about 2:24 in the recording. Below is a 2-second excerpt from the recording along with a screen capture of the audio waveform that shows several quick drop-outs as received in Baton Rouge.
Additional testing is being arranged to isolate the cause of the drop-outs.
Here are 5 audio clips from the second hour of the 9/24/20 (East-Central-Canada) RV Service Net on 7.191 MHz, recorded from my Flex-3000 transceiver in Baton Rouge. Any long time segments with no readable audio have been shortened or edited out. The stations heard are identified above each audio clip.
John WA5MLF
WU5E checked into the RV Net from South Korea using an Internet remote connection to his Flex-6600 in Tennessee. Below is part of his exchange with net control W4BXI. The audio was recorded by WA5MLF in Baton Rouge on his transceiver.
The figure below shows that WU5E and W4BXI use the Internet to connect to separate transceivers remotely. There is no direct Internet connection between their computers.
Click on any plot to magnify. |