Littleton Mass Light Department frequency change?

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wltrsf
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Location: Rt 495@ Rt2

Littleton Mass Light Department frequency change?

#1 Post by wltrsf » 10 Mar 2018 19:43

Littleton Light no longer uses 48.38. I haven't heard any activity there recently. They are licensed for new frequencies of 900.475 and 939.475 but I have heard nothing there so not sure were they have gone. I have heard Littleton Police Dispatch mention monitoring the Light Dept. radio, so they apparently are out their somewhere. I may have find someone with some inside info.

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garys
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Re: Littleton Mass Light Department frequency change?

#2 Post by garys » 10 Mar 2018 20:15

The output will be on the 939.475 frequency. The Emissions designator is 11K3F1E, which doesn't appear anywhere in the FCC Emissions Designator Table. At least not that I could find. Other 11K designators are analog, so that might be something new.

Try listening for a while and see if anything pops up.

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trp
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Re: Littleton Mass Light Department frequency change?

#3 Post by trp » 11 Mar 2018 06:04

garys wrote:
10 Mar 2018 20:15
...The Emissions designator is 11K3F1E, which doesn't appear anywhere in the FCC Emissions Designator Table. At least not that I could find. Other 11K designators are analog, so that might be something new...
I plugged the 11K3F1E into the Emission Designator Decoder/Search (https://fccid.io/Emissions-Designator/) and the results are as follows:

Bandwidth: 11.3 kHz
Modulation Type: [F] Angle-modulated, straight FM
Modulation Nature: [1] Digital, on-off or quantized, no modulation
Information Type: [E] Telephony, voice, sound broadcasting

The Emissions Designator 11K3F1E signifies a wireless radio which transfers data over a modulated wave using Digital, on-off or quantized, no modulation signal. This signal transmits at a 11.3 kHz [11K3] maximum bandwidth .
trp
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ecps92
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Re: Littleton Mass Light Department frequency change?

#4 Post by ecps92 » 11 Mar 2018 09:16

I've seen modulation listed on many an FCC License where they use P25, so I would start there.
trp wrote:
11 Mar 2018 06:04
garys wrote:
10 Mar 2018 20:15
...The Emissions designator is 11K3F1E, which doesn't appear anywhere in the FCC Emissions Designator Table. At least not that I could find. Other 11K designators are analog, so that might be something new...
I plugged the 11K3F1E into the Emission Designator Decoder/Search (https://fccid.io/Emissions-Designator/) and the results are as follows:

Bandwidth: 11.3 kHz
Modulation Type: [F] Angle-modulated, straight FM
Modulation Nature: [1] Digital, on-off or quantized, no modulation
Information Type: [E] Telephony, voice, sound broadcasting

The Emissions Designator 11K3F1E signifies a wireless radio which transfers data over a modulated wave using Digital, on-off or quantized, no modulation signal. This signal transmits at a 11.3 kHz [11K3] maximum bandwidth .

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garys
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Re: Littleton Mass Light Department frequency change?

#5 Post by garys » 11 Mar 2018 09:41

During my search, I stumbled on a long report about the various radio systems in use in the greater San Antonio, TX area. One of the drawbacks noted for 900 is that there was currently no P25 compatible equipment available. That might have changed, but I'm not sure. The license is for the water/DPW, so I don't know that it's likely they'd buy P25 even if it was available.

P25 designators all seem to start with 8K or 9K.

Other 11K designators are analog, which also seems odd for 900Mhz, although it used to be pretty common in the pre MotoTrbo days.

ecps92 wrote:
11 Mar 2018 09:16
I've seen modulation listed on many an FCC License where they use P25, so I would start there.

That's a nice find, Tom. A secret decoder ring for Emissions Designators. :)
I plugged the 11K3F1E into the Emission Designator Decoder/Search (https://fccid.io/Emissions-Designator/) and the results are as follows:

Bandwidth: 11.3 kHz
Modulation Type: [F] Angle-modulated, straight FM
Modulation Nature: [1] Digital, on-off or quantized, no modulation
Information Type: [E] Telephony, voice, sound broadcasting

The Emissions Designator 11K3F1E signifies a wireless radio which transfers data over a modulated wave using Digital, on-off or quantized, no modulation signal. This signal transmits at a 11.3 kHz [11K3] maximum bandwidth .

wltrsf
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Joined: 29 Aug 2005 19:28
Location: Rt 495@ Rt2

Re: Littleton Mass Light Department frequency change?

#6 Post by wltrsf » 11 Mar 2018 14:31

Thanks for your help, I think my best option is asking a Town employee. I haven't received anything on the frequencies I've listened to yet.

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