A long session on single sideband SSB in the 20 meter amateur band recorded on the morning of June 25, 2017 during Field Day https://en.wikipedia.org/wiki/Field_Day_(amateur_radio) recorded simultaneously with 2 WebSDR receivers, and then synched by ear in a stereo recording using Goldwave. On the left side are signals received by KFS WebSDR HF receiver system on the Pacific coast south of San Francisco, CA http://69.27.184.62:8901/ on the right are signals received at the Web SDR in Milford, Pennsylvania http://k3fef.com:8901/ We hear w7bjn in Eastern Washington heard in Pennsylvania working a "PileUp" of many stations from all over the US during the annual Field Day contest. Stations in the PileUp and interference from other frequencies are heard some in CA, some in PA and some at both sites. Makes for an interesting listening experience. At times someone from the other coast who doesn't seem to realize the frequency is in use starts calling cq as well. A bit of lightning from a storm somewhere in the range of the Pennsylvania receiver can occasionally be heard on the right.
雙接收器 - CM87tj-FN21mh websdr_recording_2017-06-25T15_34_12Z_14260.0kHz USB.wav
聲道：2
類型：wav
ssb、ham-radio、field-day、pileup、shortwave、California、United-states、radio、American、pile-up、qrm、Washington、contest、Pennsylvania、static、USB、noise、20-meters、amateur-radio
SSB、火腿無線電、場天、積累、短波、加州、美態、無線電、美國、積累、契、華盛頓、比賽、賓夕法尼亞、靜態的、USB、噪聲、20米、業餘無線電
資料來源：freesound ( https://freesound.org )