Digital modes or ?

[jjhendo]

I didn't think there was digital modes on FRS/GMRS, but I keep hearing that horrible jackhammer sound on my SDS200 scanner on the GMRS list, like your trying to hear a digital signal on an analog. But this is a digital scanner and I even got the DMR upgrade! Could it be another digital mode? What is going on here??

 

[hill]

Might be on adjacent frequency to GMRS. With scanners being wideband radios many times frequencies near bleed onto it.

With other 462 MHz frequencies being Part 90 you should do a seach of the 462 frequency range.

 

[ecps92]

I didn't think there was digital modes on FRS/GMRS, but I keep hearing that horrible jackhammer sound on my SDS200 scanner on the GMRS list, like your trying to hear a digital signal on an analog. But this is a digital scanner and I even got the DMR upgrade! Could it be another digital mode? What is going on here??

Which specific Freq ? not channel #

 

[belvdr]

I didn't think there was digital modes on FRS/GMRS, but I keep hearing that horrible jackhammer sound on my SDS200 scanner on the GMRS list, like your trying to hear a digital signal on an analog. But this is a digital scanner and I even got the DMR upgrade! Could it be another digital mode? What is going on here??

I get this type of sound frequently on 2m here. I haven't had anyone able to identify it. I'll see if I can get a recording some time and see how it compares.

 

[oldradioguy2010]

When I worked on Land Mobile Raios, there what was called splinter frequency between input and out put repeater freqs.
A over the counter scanner may have a wide
receiver and possibly picking those signals
Food for thought.


DW
swl op
wdx6hwo

 

[MTS2000des]

I get this type of sound frequently on 2m here. I haven't had anyone able to identify it. I'll see if I can get a recording some time and see how it compares.

Could be P25, NXDN, DMR, D-Star or YSF- all of which are permissible on part 97.

 

[ecps92]

When I worked on Land Mobile Raios, there what was called splinter frequency between input and out put repeater freqs.
A over the counter scanner may have a wide
receiver and possibly picking those signals
Food for thought.


DW
swl op
wdx6hwo

Sadly what WE all knew as splinters are now full-use frequencies, all the old 12.5 khz and now even using 6.25 channel spacings

 

[nd5y]

Could be P25, NXDN, DMR, D-Star or YSF- all of which are permissible on part 97.

You forgot M17.

 

[jjhendo]

Which specific Freq ? not channel #

What ever is channel 2 on GMRS, not sure.

 

[jjhendo]

I get this type of sound frequently on 2m here. I haven't had anyone able to identify it. I'll see if I can get a recording some time and see how it compares.

Yeah, its really annoying. Whatever digital mode it may be, I'm not sure why this scanner can't decode it..?

 

[jjhendo]

Could be P25, NXDN, DMR, D-Star or YSF- all of which are permissible on part 97.

Huh. Well I don't have the NXDN upgrade, but it didn't sound like the other NXDN signal noise I get on rail. I would have thought the SDS would hear everything else?

 

[nd5y]

Yeah, its really annoying. Whatever digital mode it may be, I'm not sure why this scanner can't decode it..?

It might be somebody running some protocol other than digital voice that no scanner can decode.

 

[ecps92]

What ever is channel 2 on GMRS, not sure.

channel names, are not always consistent across the many makes/models of two-way GMRS
Knowing the explicit freq is more helpful.

Also the RR DB does not list an AlphaTAG as GMRS 2

General Mobile Radio Service (GMRS) (United States) Scanner Frequencies and Radio Frequency Reference

Scanner Frequencies and Radio Frequency Reference for General Mobile Radio Service (GMRS) (United States)

www.radioreference.com

 

[oldradioguy2010]

I have in my radio, channel 2 as FRS/GMRS as 462.587 mc.
But is that a GMRS frequency or a combo frequency?
From FCC data base.


DW
swl op
wdx6hwo

 

[nd5y]

I have in my radio, channel 2 as FRS/GMRS as 462.587 mc.
But is that a GMRS frequency or a combo frequency?
From FCC data base.

All FRS frequencies are are also GMRS. The only frequencies not shared by both services are the GMRS repeater inputs.

FRS/GMRS combined channel chart - The RadioReference Wiki

wiki.radioreference.com

 

[MUTNAV]

I didn't think there was digital modes on FRS/GMRS, but I keep hearing that horrible jackhammer sound on my SDS200 scanner on the GMRS list, like your trying to hear a digital signal on an analog. But this is a digital scanner and I even got the DMR upgrade! Could it be another digital mode? What is going on here??

I think there were some exceptions for some positioning information like Garmins Rino 120s etc... Although it probably isn't what you're talking about having heard.

 

[oldradioguy2010]

Thank you Tom. That was what I was trying to get at. You said it better.

DW
swl op
wdx6hwo

 

[DeoVindice]

It may be DMR control channel splatter from 462MHz Part 90 users. That has been a major issue in Arizona.

 

[ecps92]

I have in my radio, channel 2 as FRS/GMRS as 462.587 mc.
But is that a GMRS frequency or a combo frequency?
From FCC data base.


DW
swl op
wdx6hwo

Thanks 462.5875 is a simplex GMRS splinter and original FRS only

likely, either someone not following the rules, altho you indicate nothing decodes, so then could be one of the Rhino with GPS (sold for Dog tracking in some areas)

Outside of interference from Part 90 channels, you would have likely already noticed images from other sources

 

[CollinsURG]

It may be an image frequency. Something on another frequency appearing in the IF stage that is a product of the mixer.

Do you have a different scanner or radio that can tune that frequency? Does it also receive it when tuned to the same frequency? If another radio does not receive it. It is most likely an image.