806-809 mhz.
I have a BC536, programmed through Sentinat and the RR database.
Question 1: Sherriff has 3 channels in the talk group, but I only ever hear traffic on the mobiles channel 3. Never any traffic on dispatch channel 1 ? Any clue what might be wrong ?
Question 2: FRS traffic. Seem to be getting most of it. In Sentinel there are a list of frees in the 856-859 range. However FCC licenses show a bunch of freqs in the 806 - 809 range that correlate with known FRS stations, that aren't listed in Sentinel. Should they be there ?
Not stupid about scanning, but it has become much more advanced.
Thanks in advance....
Greg
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Greg:
806-809 mhz. are part of the input frequency ranges to 800 mhz. trs. Actually the typical input range is 806-817 mhz.(Region 42). Add 45 mhz. to determine the output frequency or subtract 45 mhz. from the output frequency to determine the input frequency.
In the past I recall seeing selected frequencies in the input range licensed for mobile simplex. Maybe we should be paying more attention to the 806-817 mhz. range for monitoring.
For example, Henrico Co. Sheriff WPMZ405. The authorized emission is "20K0F9W". Here is an extract of the RR FCC Emission Codes section.
"Use of F9W Suffix
Some license application preparers have used the suffix F9W to indicate that multiple different emissions within the specified bandwidth are possible. This simplifies filling information into the FCC 601 form, but does not reflect each specific modulation type. For example, 11K2F9W may indicate that the system toggles between narrowband analog voice and P25 (or some other) digital emission, but not at the same time. A strict interpretation of ITU emissions indicates that the F9W suffix is both analog and digital simultaneously, and is therefore incorrect. A properly completed 601 form should itemize each discrete emission intended so the technologies used may be easily identified.
The exception to using F9W is Harris OpenSky, which has been certificated by the FCC as F9W, although F7W may be better descriptive".
End of RR Quote
Did everybody understand that?....It's a lengthy way of saying it can be whatever emission modes are licensed to the user. Thanks for that clarification. Instead of attempting to parse or dissect the above verbage, let's assume it is the typical emission mode used by the Henrico Co., VA Police Dept.
For the curious here is the FCC License link:
ULS License - PubSafty/SpecEmer/PubSaftyNtlPlan,806-817/851-862MHz,Conv License - WPMZ405 - County of Henrico, Police Division
IAW PUBLIC SAFETY NATIONAL PLAN REGION #42 []
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Here's another one: Pittsylvania Co. WQRI339 E.C.C./Law Enforcement
ULS License - PubSafty/SpecEmer/PubSaftyNtlPlan,806-817/851-862MHz,Conv License - WQRI339 - PITTSYLVANIA COUNTY, VA
Unless I am misreading the frequencies' use, there is one 807 and two 808 mhz. 3 watt mobile frequencies which can be used as simplex tac or possibly by their appropriate base frequencies for reverse frequency relationship comms. The 852 and 853 mhz. frequencies also are used as mobile extenders.
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Last one: Blackburg PD WPQH221
ULS License - PubSafty/SpecEmer/PubSaftyNtlPlan,806-817/851-862MHz,Conv License - WPQH221 - BLACKSBURG, TOWN OF
The license is quite clear.
"90.617 - POLICE DISPATCH AND TACTICAL COMMUNICATIONS. GOV T ENTITY "
Spot checking, unless I am mistaken, there are a couple of simplex frequencies in the 806 mhz. range which probably are for tac comms. Once again "F9W" emission code is used.
So a conclusion can be made that some comms are being missed by those monitors in these aforementioned areas because these lower 800 mhz. frequencies are not being scanned.
This also applies to NOVA and the large trs in use. I didn't research them but Fairfax Co. probably would be largest one to check.
John
W4UVV
