Oddity Ham DMR

[SCPD]

I live in Oklahoma City, Ok. I had HDSDR running tuning 2 meters then I saw a.digital data stream at 143.015 later at 143.075mhz. I thot what is going on here. I fired up DSD+ and heard everyday usual ham radio operator ragchew as casual as usual. Nothing military affiliated about this.

Now my question to the community is why the heck would a repeater trustee allow his repeater to operate outside his or her priviledge? I know for dang sure M.A.R.S. only allows net traffic. I didn't get a cw id nor voice id.

???????[emoji50]

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[djs13pa]

Could be intermod


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[SCPD]

Could be intermod


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Thats another thing I suspected but I checked 70cm 1.25m and 2m. No DMR transmissions. Watched the waterfall for input to see one ham 400kc above repeater output.

I checked DMARC but nothing from OKC. There was a few listed in Oklahoma but outside listening range. It was linked. I heard VK Australia call signs too. hmmm

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[autovon]

Highly doubtful it is ham. Still likely it is an image. Also, there are 2 UHF DMR ham repeaters in the OKC area.

 

[Cognomen]

I didn't get a cw id nor voice id.

Maybe it's a bootleg rptr, and they figure nobody can hear them because they're "digital".

 

[SCPD]

Maybe it's a bootleg rptr, and they figure nobody can hear them because they're "digital".

That's what I am implying. Hence no cw id nor voice id. that would have been heard even if it was intermod or an image of another frequency. I also think the decode wouldnt be as clean if it was intermod or image of another frequency. It may be bootleg.

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[Voyager]

Was there any in-band digital transmission at the time?

Intermod, mixing, images are all possibilities.

It could also be a MARS/CAP repeater that they were using for chatter (happens a lot). Were any callsigns mentioned?

 

[SCPD]

Was there any in-band digital transmission at the time?

Intermod, mixing, images are all possibilities.

It could also be a MARS/CAP repeater that they were using for chatter (happens a lot). Were any callsigns mentioned?

Oh snap! It was image from 443.225mhz. I had no idea there is a 70 cm repeater so strong nearby. RF gain reduced to 14.4db and it's still 15db over 9.

Sorry about that guys.

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[Voyager]

Nothing to be sorry about. It was an interesting issue and you gained experience.

 

[SCPD]

Nothing to be sorry about. It was an interesting issue and you gained experience.

That's the issue of rtlsdr. Waterfall may look clean but check 300mhz higher. I just learnt. Thanks community. You helped me think being adamant asking the same thing. Is it imaging? Well yes it was.

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[SCPD]

Here is the repeater

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[N5TWB]

Glad you sorted it out, learned something from your experience.

 

[autovon]

Most of us have been fooled by the 'image game' a time or two. 10 or 15 years ago I was picking up a repeater around 410 MHz. It kind of sounded like Feds, but very our of place from where I lived. Ended up being an image from the 450 band.