Strange sounds from an Icom R75

sheldonk

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New Knoxville, Ohio
#1
I do hope I am posting this in the right section.

Heard this around 12:30 to 1am on Monday morning July 23 using Ham Radio Deluxe (free) software. 7.074khz, 3.573khz, (all LSB) and a few other frequencies. In the comment section of the software was "FT8 sent:+02 Rcvd: -05." Near the end of the clip you can hear me change from LSB to USB then to CW, etc. but not necessarily in that order. Can someone tell me what I am hearing? Can this be decoded?
Here is a link to the audio via Youtube. (I hope that is acceptable) I am of the opinion that I didn't have my radio tuned to the exact frequency or I may have been in the wrong mode. But I heard it on 160 meters, 80 meters, and 40 meters on several different frequencies.

https://www.youtube.com/watch?v=PvFh2qwxGVM


Thanks
 

krokus

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Jun 9, 2006
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3,576
Location
Southeastern Michigan
#2
I do hope I am posting this in the right section.

Heard this around 12:30 to 1am on Monday morning July 23 using Ham Radio Deluxe (free) software. 7.074khz, 3.573khz, (all LSB) and a few other frequencies. In the comment section of the software was "FT8 sent:+02 Rcvd: -05." Near the end of the clip you can hear me change from LSB to USB then to CW, etc. but not necessarily in that order. Can someone tell me what I am hearing? Can this be decoded?
Here is a link to the audio via Youtube. (I hope that is acceptable) I am of the opinion that I didn't have my radio tuned to the exact frequency or I may have been in the wrong mode. But I heard it on 160 meters, 80 meters, and 40 meters on several different frequencies.

https://www.youtube.com/watch?v=PvFh2qwxGVM


Thanks
Sounds like PSK31, but with a bit of multipath, or even auroral, propagation.

Sent using Tapatalk
 

sheldonk

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New Knoxville, Ohio
#4
Thanks for the replies. I've spent about an hour listening to sound clips on various sites and came up with nothing. Thanks for the software suggestion. I'll give it a try.
 

mm

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Dec 19, 2002
Messages
590
#5
FLDIGI will not decode because that is FT8, transmitted with either wsjt-x or jtdx software.

You can use 2 software programs either WSJT-X or JTDX to decode it with your R75 set to USB, UPPER SIDEBAND mode only.

see wsjt-x, FT8 SUBMODE below.
WSJT-X User Guide

software
https://www.jtdx.tech/en/
or
https://physics.princeton.edu/pulsar/k1jt/wsjtx.html

You will also need an interface such as the SIGNALINK or similar modem.
SignaLink USB Interface

and a NTP clock program.
https://www.meinbergglobal.com/english/sw/ntp.htm#ntp_stable



Some of the exact FT8 HF feq's in MHz all in usb mode are 1.840, 3.573, 7.074, 10.136, 14.074, 18.100, 21.074, 24.915, 28.074, 50.313,

FT8, 2-way contacts are really basic 15 second transmissions with the 15 seconds containing either CQ'S with callsigns or both callsigns and signal strengths along with maiden head grid locators.

Successful contacts are boring and very basic consisting of both station callsigns with a received signal strength report similar to W1JT W1AA R-12, and CONTACTS ending with both stations callsigns an a 73 but there are no real conversation messages transmitted only these fast quick qso messages.
 

sheldonk

Member
Premium Subscriber
Joined
Aug 5, 2007
Messages
14
Location
New Knoxville, Ohio
#7
FLDIGI will not decode because that is FT8, transmitted with either wsjt-x or jtdx software.

You can use 2 software programs either WSJT-X or JTDX to decode it with your R75 set to USB, UPPER SIDEBAND mode only.

see wsjt-x, FT8 SUBMODE below.
WSJT-X User Guide

software
https://www.jtdx.tech/en/
or
https://physics.princeton.edu/pulsar/k1jt/wsjtx.html

You will also need an interface such as the SIGNALINK or similar modem.
SignaLink USB Interface

and a NTP clock program.
https://www.meinbergglobal.com/english/sw/ntp.htm#ntp_stable



Some of the exact FT8 HF feq's in MHz all in usb mode are 1.840, 3.573, 7.074, 10.136, 14.074, 18.100, 21.074, 24.915, 28.074, 50.313,

FT8, 2-way contacts are really basic 15 second transmissions with the 15 seconds containing either CQ'S with callsigns or both callsigns and signal strengths along with maiden head grid locators.

Successful contacts are boring and very basic consisting of both station callsigns with a received signal strength report similar to W1JT W1AA R-12, and CONTACTS ending with both stations callsigns an a 73 but there are no real conversation messages transmitted only these fast quick qso messages.
Might be a little over my head but sounds intriguing. Doesn't hurt to do more research I guess. Not sure if it's worth it though.

Thank you
 
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