Frequency Rounding

[K4ASJ]

I Can Put A Frequency In Like 154.9375 And It Will Round To 154.980
Or Such And I Was Wondering If It Rounds It Can You Still Hear The Activity On The Channel You Were Originally Going To Put In There.

Thanks To All That Replies

 

[Mick]

Howdy. If your scanner rounds out 154.9375 to 154.98, you will not be able to hear the radio traffic on 154.9375. If your scanner rounds out 154.9375 to 154.935 or 154.940 you would be able to hear the 154.9375 radio traffic.

 

[MacombMonitor]

I Can Put A Frequency In Like 154.9375 And It Will Round To 154.980
Or Such And I Was Wondering If It Rounds It Can You Still Hear The Activity On The Channel You Were Originally Going To Put In There.

Thanks To All That Replies

What scanner are you using?

 

[n4voxgill]

GRE will not let you enter an invalid frequency, the scanner will round it to a correct frequency. If you check the FCC Part 90 rules for the frequencies you will see there is no 154.9375.

The actual frequencies around that are 154.920, 154.9275, 154.935, 154.9425. So a frequency of 154.9375 would cause interference on 154.935.

I don't see any close frequency in Wayne County. If you are using a close call function, they will frequentyly stop before they get to the center of the frequenccy and show a wrong number.

What agency are you trying to monitor?

 

[Mick]

Howdy! Sure hope he's not in Alaska. They have 154.9375 licensed there under:
WPYG870
ALASKA, STATE OF
5900 EAST TUDOR ROAD
ANCHORAGE, AK 99507
Transmitter Address /Area of Operation:
Transmit Location:
MILE 321 RICHARDSON HIGHWAY
HARDING LAKE, AK
154.7875
154.9375
155.4750
156.1750

GRE will not let you enter an invalid frequency, the scanner will round it to a correct frequency. If you check the FCC Part 90 rules for the frequencies you will see there is no 154.9375.
What agency are you trying to monitor?

 

[n4voxgill]

his info says he is in North Carolina. I doubt if he can hear Alaska.

 

[SIMON11]

Why would it round up as high as 1549.8? Could it be the step frequency that is set? I don't know enough about frequencies just asking.

 

[MississippiPI]

I have Uniden BCT-8 and experienced the same prolem. To make sure I had programmed what I needed, I programmed in exactly what the frequency was, I saw how the scanner rounded it off and I programmed it in the other; either up or down a little--works fine.


Be Safe

 

[MacombMonitor]

The higher-end Uniden scanners allow you to override this problem.

 

[Mick]

Howdy. I was only responding to the post quoted in my message. and included it in the same post.

his info says he is in North Carolina. I doubt if he can hear Alaska.

 

[seamusg]

It would be easier if he responded with the Model of scanner he has, other than that it is all BS.

 

[Voyager]

Howdy! Sure hope he's not in Alaska. They have 154.9375 licensed there under:
WPYG870
ALASKA, STATE OF
5900 EAST TUDOR ROAD
ANCHORAGE, AK 99507
Transmitter Address /Area of Operation:
Transmit Location:
MILE 321 RICHARDSON HIGHWAY
HARDING LAKE, AK
154.7875
154.9375
155.4750
156.1750

Alaska has the 'luxury' of being able to get 'odd' frequencies and 'odd' bandplans that don't meet the FCC's standards since they don't have to worry about neighboring states.

Truth is that 154.9375 MHz (IF that's not an FCC typo) is only 2.5 kHz away from a 'standard' (continental US) frequency of 154.935 MHz, and there isn't a receiver made yet that will work with channel spacing that close. It looks like they are using a 12.5 kHz bandplan in Alaska. Maybe they actually did the math that says you can fit an 11 kHz bandwidth transmitter in a 7.5 kHz bandwidth channel, and it didn't add up to them, so they went with 12.5 kHz channels which WILL acommodate an 11 kHz signal. Maybe not all government is math-challenged!

BUT, don't feel bad. Scanners such as the PRO-96 won't even cover the continental USA bandplan in the FedBand, and that is nationwide.

It also won't cover the 440-450 HAM band in Northern CA that uses 20 kHz channels.

As for rounding 154.9375 MHz to 154.980 MHz, that HAS to be a typo. Nothing rounds that far (42.5 kHz) out (even using 50 or 100 kHz spacing).

Joe M.

 

[basprog]

It also won't cover the 440-450 HAM band in Northern CA that uses 20 kHz channels.
Joe M.

You bring up a good point for those areas using 20khz spacing for the amateur 440 band. With my pro-97 and Pro-99, I never use the built-in search, but use the custom search (6) limits for the 440 band which then defaults to 6.25 khz. It gets me a bit closer to the real freq (depending upon the actual freq) at times which is handy for the weak ones.