Digital signal on 145.800

[Chris Sullivan]

Is anyone else able to hear this signal? It is FM modulated and transmitting at least once or twice every 5 minutes 24 hours a day. I haven't identified the digital protocol yet except that I know it is not AX.25-1200. It is full quieting here.

145.800 is the ISS voice & SSTV frequency, so this transmission. My tower isn't high enough to receive the ISS 24 hours a day so this transmission is non-compliant with the 2m band plan.

73,

Chris

[emcomm YRARC]

Ill do a listen 

Rob Schuetze

Aurora Online Inc.

20521 Centre Street

Mount Albert, ON

L0G 1M0

T: (905) 222-2022

F: (866) 812-7442

W: www.auroraonline.com

r...@auroraonline.com

On Sep 26, 2025, at 8:38 AM, Chris Sullivan <goo...@ve3nrt.net> wrote:

Is anyone else able to hear this signal? It is FM modulated and transmitting at least once or twice every 5 minutes 24 hours a day. I haven't identified the digital protocol yet except that I know it is not AX.25-1200. It is full quieting here.

145.800 is the ISS voice & SSTV frequency, so this transmission. My tower isn't high enough to receive the ISS 24 hours a day so this transmission is non-compliant with the 2m band plan.

73,

Chris

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[csm...@cogeco.ca]

Nothing at all in Ancaster, (FN03AF), and I’m about 800 feet ASL.

 

[Roger Miller]

Yup--loud and clear on a 2 to 4 minute interval---sounds like an automated kerchunk--maybe a repeater kerchunker doesnt know how to program his radio--lets not teach him......

Hug a musician--they never get to dance!!

Regards, Roger  🎷  VE3EZ/VE3ROG

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[Eric Brown]

145.800 does not seem to be registered with TAFL dbase. 

Eric Brown VE3EB 

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[Ron Gibson VE3CGR]

I'm hearing a very clear 1200 baud packet beacon on 145.795. My radio may be off on frequency as it's very scratchy onn 145.800. Probably an APRS beacon hoping to be digied through the ISS.

Ron VE3CGR

On Fri, Sep 26, 2025 at 8:38 AM Chris Sullivan <goo...@ve3nrt.net> wrote:

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[Matthew VE3XYU]

I'm picking it up in east Markham on my mobile. Very scratchy. 

I'll continue listening to it as I head north with the Yaesu AMS mode on, to see if it decodes anything.

Matthew VE3XYU

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[Matthew VE3XYU]

Definitely stronger as I approached Newmarket. Likely not anything Yaesu digital  because my radio switched to FM mode after receiving it the clearest. 

[Chris Sullivan]

I'm trying to put together the tools to analyze it, but so far it looks like some multicarrier digital mode. It is at least 16kHz wide. It started on Sunday at 16:15 and has been continuous since then. 

Thanks for the signal reports. Any more would be helpful. Sounds like an opportunity for a fox hunt.

73,m

Chris

[Brian Waterworth]

It does sound like APRS.  Heard it full quieting, full signal at my qth in Newmarket.  My antenna height is just about 15’ above ground.  

Fired up Direwolf and decoded the following two messages that flip-flopped every few minutes on 145.800MHz:

VA3BAL-7 audio level = 3(1/1)   [NONE]   _|||_____
[0.2] VA3BAL-7>NODES:(UI cmd, p=0)<0xff>BALNOD<0xac><0x82>f<0x84><0x82><0x98><0x02>DXBAL <0xac><0x82>f<0x84><0x82><0x98><0x0e><0xff><0xac><0x82>f<0x84><0x82><0x98><0x1c>WLKBAL<0xac><0x82>f<0x84><0x82><0x98><0x0e><0xff>

VA3BAL-9 audio level = 4(1/0)   [NONE]   ||||_____
[0.1] VA3BAL-9>INFO:va3bal -5 = jnos, -8 = (X)net, -9 = UroNode, -10 = Winlink, IP: 44.135.92.101
Unknown APRS Data Type Indicator "v", normal car (side view)

Regards

Brian

VE3IBW

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[Eric Brown]

Oops! Something is off frequency!

Eric Brown
VE3EB/VE3OIC/VA3OIC
  
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[Chris Sullivan]

Thanks Brian. From my SDR recordings it wasn't decoding as AX.25 because it is off frequency. I was able to get decodes by tuning to 145.806 kHz. That is in the satellite/ISS sub-band. If he's trying to get the ISS APRS channel it's 19 kHz off frequency.

I have sent an email to Doug about it.

73,
Chris

[Eric Brown]

Who gets to tell COARC.

Eric Brown
VE3EB/VE3OIC/VA3OIC
  
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[Joseph Cooper]

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[Chris Sullivan]

Well that adds some pressure to the situation. I've sent a 2nd email to Doug, VE3ATP to try and get this resolved.

73,
Chris

[Eric Brown]

When it rains, it pours.

Eric Brown
VE3EB/VE3OIC/VA3OIC
  
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[Joe Cooper]

145.800 is the downlink amateur radio frequency for the ISS ham repeater and SSTV. This is different than the FM repeater frequencies of 437.800 MHz for the crossband FM repeater downlink (with a 145.990 MHz uplink). The 145.800 frequencies are used by the astronauts to call CQ to ground based hams. They monitor 145.200 for replies. 

On Fri, Sep 26, 2025 at 10:51 AM Joe Cooper <joeineas...@gmail.com> wrote:

I have been monitoring 145.800 and I am hearing a repeated carrier that is off for eight seconds and on for five seconds. I only hear it on SSB/CW mode. I don’t hear anything using AM or FM mode. It’s less than S1 but still clear. It sounds like a channel squatting signal to me. 

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[Joe Cooper]

I have been monitoring 145.800 and I am hearing a repeated carrier that is off for eight seconds and on for five seconds. I only hear it on SSB/CW mode. I don’t hear anything using AM or FM mode. It’s less than S1 but still clear. It sounds like a channel squatting signal to me. 

To view this discussion visit https://groups.google.com/a/yrarc.org/d/msgid/yrarc.group/828016905.891771.1758894940306%40mail.yahoo.com.

[Joe Cooper]

I just checked on 145.200 and I hear the same repeated carrier. I also hear it on 145.240, 145.440, 145.480.