FCC Databse

[Tophtoh]

On the FCC database it says a number of things that I am not sure what they mean, if someone could let me know I'd appreciate it.

1. Emission Sequence (Repeater hang time?)
2. ERP (is at 250)
3. Emmision Code?
4. Type first use (A - analog?)
5. Coser?

Thanks

 

[k8tmk]

I can answer a couple of your questions off the top of my head.

ERP stands for Effective Radiated Power. To find ERP, add the gain of the antenna (expressed in dB = decibels) to the output power of the transmitter (usually expressed in watts). For example, an antenna with a gain of 3 dB would double the output power of the transmitter (decibels are logarithmic, so 3 dB works out to be double, not triple). So, if the transmitter put out 100 watts, and the antenna had 3 dB gain, the ERP would be 200 watts. This means that the signal would be received as if the transmitter were actually 200 watts. It's a more accurate way of specifying the reception (or interference) range of the transmitter.

Emission type refers to the type of modulation (AM, FM, etc.). The number indicates the bandwidth of the modulated signal. On your scanner, aircraft uses AM (amplitude modulation) while police, fire, etc. use FM (Frequency Modulation). Interestingly, your television uses both AM and FM. The picture is transmitted in AM and the sound is transmitted in FM, within the same 6 MHz wide channel.

Hope this oversimplified explanation helps.

Randy

 

[nd5y]

The explanation for emission designators is here
http://wireless.fcc.gov/services/ind&bus/licensing/emission.html

COSER is the Co Channel Serial Licensing System, which is how the
US & Canada coodinate frequency use along the border.

Tom

 

[nd5y]

most of the other codes can be found here
http://gullfoss2.fcc.gov/reports/help/allmaps.htm

Which is what you get from the help link on the General Menu Reports web site and click on WTB Land Mobile Data Dictionary.

Tom

 

[Tophtoh]

OK, next question , some frequencies seem to be louder than others, the volume they broadcast at, my sheriff is very loud, a fire dept. in the county I have to turn up all the way to hear, is there anyway for them to control the volume coming off the repeater or... thanks.

 

[nd5y]

That is because some stations use 5 kHz deviation and some are 2.5 kHz deviation (narrow FM).

Tom

 

[jim202]

FCC station class update

most of the other codes can be found here
http://gullfoss2.fcc.gov/reports/help/allmaps.htm

Which is what you get from the help link on the General Menu Reports web site and click on WTB Land Mobile Data Dictionary.

Tom

The FCC has started using FB8 for trunking licenses for the station CLASS. Have seen this on a number of UHF licenses on each of their channels. Not sure just when this was started, but has been in effect for at least a year.

Jim