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Frequency Scanners
Scanners can monitor a variety of things: police, fire, EMS, and even air traffic. Although they can't transmit, they are still very useful.
409 Questions
What are the Fairfield Iowa scanner frequencies?
KQS578 45.56000 2003-05-13 10 0 MO PW FAIRFIELD FAIRFIELD, CITY OF KQS578 45.56000 2003-05-13 1 0 FB PW FAIRFIELD FAIRFIELD, CITY OF WPJN903 154.22000 2001-08-21 1 0 FB PW FAIRFIELD FAIRFIELD, CITY OF WPJN903 154.22000 2001-08-21 25 0 MO PW FAIRFIELD FAIRFIELD, CITY OF WPJN903 154.28000 2001-08-21 1 0 FB PW FAIRFIELD FAIRFIELD, CITY OF WPJN903 154.28000 2001-08-21 25 0 MO PW FAIRFIELD IOWA HOMELAND SECURITY REGION #5 WQER661 4940.00000 2006-03-30 0 0 PA FAIRFIELD IOWA HOMELAND SECURITY REGION #5 WQER661 4940.00000 2006-03-30 0 0 PA IOWA, STATE OF KUV801 154.66500 2002-01-18 1 0 FX1 PW FAIRFIELD IOWA, STATE OF KUV801 154.80000 2002-01-18 1 0 FX1 PW FAIRFIELD IOWA, STATE OF KUV801 155.37000 2002-01-18 1 0 FB PW FAIRFIELD IOWA, STATE OF KUV801 155.56500 2002-01-18 1 0 FB PW FAIRFIELD IOWA, STATE OF KUV801 155.56500 2002-01-18 1 0 FB2 PW FAIRFIELD IOWA, STATE OF KUV801 155.70000 2002-01-18 1 0 FB PW FAIRFIELD IOWA, STATE OF KUV801 155.70000 2002-01-18 1 0 FB2 PW FAIRFIELD IOWA, STATE OF WPWP853 155.98500 2003-01-02 1 0 FX1 PW FAIRFIELD IOWA, STATE OF WPWP853 155.98500 2003-01-02 50 0 MO PW FAIRFIELD IOWA, STATE OF WPMA712 155.98500 2003-11-04 1 0 FB PW FAIRFIELD IOWA, STATE OF KNT66 155.98500 2003-12-03 1 0 FX1 PW FAIRFIELD IOWA, STATE OF WPMA712 156.06000 2003-11-04 1 0 FX1 PW FAIRFIELD IOWA, STATE OF KNT66 156.06000 2003-12-03 1 0 FX1 PW FAIRFIELD IOWA, STATE OF KNT66 156.07500 2003-12-03 1 0 FX1 PW FAIRFIELD IOWA, STATE OF KNT66 156.10500 2003-12-03 1 0 FX1 PW FAIRFIELD IOWA, STATE OF WPMA712 158.89500 2003-11-04 1 0 FX1 PW FAIRFIELD IOWA, STATE OF WPWP853 158.89500 2003-01-02 1 0 FB2C PW FAIRFIELD IOWA, STATE OF KNT66 159.12000 2003-12-03 1 0 FB PW FAIRFIELD IOWA, STATE OF KNT66 159.12000 2003-12-03 1 0 FB2C PW FAIRFIELD IOWA, STATE OF KNT66 159.16500 2003-12-03 1 0 FB2C PW FAIRFIELD IOWA, STATE OF KNT66 159.16500 2003-12-03 1 0 FB PW FAIRFIELD IOWA, STATE OF KNT66 159.18000 2003-12-03 1 0 FB2C PW FAIRFIELD IOWA, STATE OF WPMA712 159.18000 2003-11-04 1 0 FB PW FAIRFIELD IOWA, STATE OF KNT66 159.18000 2003-12-03 1 0 FB PW FAIRFIELD IOWA, STATE OF KNT66 159.19500 2003-12-03 1 0 FB PW FAIRFIELD JEFFERSON COUNTY AREA AMBULANCE COR WQDN678 155.40000 2005-10-11 1 0 FB PW FAIRFIELD JEFFERSON COUNTY AREA AMBULANCE COR WQDN678 155.40000 2005-10-11 25 0 MO PW FAIRFIELD JEFFERSON COUNTY HOSPITAL WPEA560 153.84500 2003-12-31 15 0 MO PW JEFFERSON COUNTY HOSPITAL WPEA560 153.84500 2003-12-31 15 0 MO PW FAIRFIELD JEFFERSON COUNTY HOSPITAL WPEA560 155.20500 2003-12-31 1 0 FB PW JEFFERSON COUNTY HOSPITAL WPEA560 155.20500 2003-12-31 12 0 MO PW JEFFERSON COUNTY HOSPITAL WPEA560 155.20500 2003-12-31 1 0 FB PW FAIRFIELD JEFFERSON COUNTY HOSPITAL WPEA560 155.20500 2003-12-31 12 0 MO PW FAIRFIELD JEFFERSON COUNTY HOSPITAL WPEA560 155.30250 2003-12-31 8 0 MO PW JEFFERSON COUNTY HOSPITAL WPEA560 155.30250 2003-12-31 8 0 MO PW FAIRFIELD JEFFERSON COUNTY HOSPITAL WPEA560 155.34000 2003-12-31 1 0 FB PW JEFFERSON COUNTY HOSPITAL WPEA560 155.34000 2003-12-31 12 0 MO PW JEFFERSON COUNTY HOSPITAL WPEA560 155.34000 2003-12-31 1 0 FB PW FAIRFIELD JEFFERSON COUNTY HOSPITAL WPEA560 155.34000 2003-12-31 12 0 MO PW FAIRFIELD JEFFERSON COUNTY HOSPITAL WPEA560 158.80500 2003-12-31 15 0 MO PW JEFFERSON COUNTY HOSPITAL WPEA560 158.80500 2003-12-31 1 0 FB2 PW JEFFERSON COUNTY HOSPITAL WPEA560 158.80500 2003-12-31 15 0 MO PW FAIRFIELD JEFFERSON COUNTY HOSPITAL WPEA560 158.80500 2003-12-31 1 0 FB2 PW FAIRFIELD JEFFERSON COUNTY HOSPITAL WPEA560 163.24250 2003-12-31 8 0 MO PW JEFFERSON COUNTY HOSPITAL WPEA560 163.24250 2003-12-31 8 0 MO PW FAIRFIELD JEFFERSON COUNTY HOSPITAL WPEA560 163.25000 2003-12-31 1 40 FB PW JEFFERSON COUNTY HOSPITAL WPEA560 163.25000 2003-12-31 1 40 FB PW FAIRFIELD JEFFERSON, COUNTY OF KWM583 151.02500 2004-01-01 1 0 FB2 PW FAIRFIELD JEFFERSON, COUNTY OF KAH677 154.80000 2005-10-12 1 0 FX1 PW JEFFERSON, COUNTY OF KAH677 154.80000 2005-10-12 55 0 MO PW FAIRFIELD JEFFERSON, COUNTY OF KAH677 154.80000 2005-10-12 55 0 MO PW JEFFERSON, COUNTY OF KAH677 154.80000 2005-10-12 1 0 FX1 PW FAIRFIELD JEFFERSON, COUNTY OF KAH677 155.01000 2005-10-12 1 10 FB PW FAIRFIELD JEFFERSON, COUNTY OF KAH677 155.01000 2005-10-12 1 10 FBS PW JEFFERSON, COUNTY OF KAH677 155.01000 2005-10-12 55 0 MO PW FAIRFIELD JEFFERSON, COUNTY OF KAH677 155.01000 2005-10-12 1 10 FB PW JEFFERSON, COUNTY OF KAH677 155.01000 2005-10-12 55 0 MO PW JEFFERSON, COUNTY OF KAH677 155.01000 2005-10-12 1 10 FBS PW FAIRFIELD JEFFERSON, COUNTY OF KAH677 155.05500 2005-10-12 1 100 FB PW FAIRFIELD JEFFERSON, COUNTY OF KAH677 155.05500 2005-10-12 1 100 FB PW JEFFERSON, COUNTY OF KAH677 155.05500 2005-10-12 100 0 MO PW FAIRFIELD JEFFERSON, COUNTY OF KAH677 155.05500 2005-10-12 100 0 MO PW JEFFERSON, COUNTY OF KAH677 155.37000 2005-10-12 1 10 FB PW JEFFERSON, COUNTY OF KAH677 155.37000 2005-10-12 1 10 FB PW FAIRFIELD JEFFERSON, COUNTY OF KAH677 155.47500 2005-10-12 1 10 FBS PW JEFFERSON, COUNTY OF KAH677 155.47500 2005-10-12 1 10 FB PW JEFFERSON, COUNTY OF KAH677 155.47500 2005-10-12 55 0 MO PW FAIRFIELD JEFFERSON, COUNTY OF KAH677 155.47500 2005-10-12 55 0 MO PW JEFFERSON, COUNTY OF KAH677 155.47500 2005-10-12 1 10 FBS PW FAIRFIELD JEFFERSON, COUNTY OF KAH677 155.47500 2005-10-12 1 10 FB PW FAIRFIELD JEFFERSON, COUNTY OF KAH677 155.53500 2005-10-12 1 10 FB PW JEFFERSON, COUNTY OF KAH677 155.53500 2005-10-12 1 10 FB PW FAIRFIELD JEFFERSON, COUNTY OF KAH677 155.85000 2005-10-12 55 0 MO PW FAIRFIELD JEFFERSON, COUNTY OF KAH677 155.85000 2005-10-12 55 0 MO PW JEFFERSON, COUNTY OF KAH677 155.91000 2005-10-12 55 0 MO PW FAIRFIELD JEFFERSON, COUNTY OF KAH677 155.91000 2005-10-12 55 0 MO PW JEFFERSON, COUNTY OF KAH677 155.92500 2005-10-12 55 0 MO PW FAIRFIELD JEFFERSON, COUNTY OF KAH677 155.92500 2005-10-12 55 0 MO PW JEFFERSON, COUNTY OF KWM583 156.24000 2004-01-01 20 0 MO PW FAIRFIELD JEFFERSON, COUNTY OF KWM583 156.24000 2004-01-01 2 0 FX1 PW FAIRFIELD JEFFERSON, COUNTY OF KAH677 458.57500 2005-10-12 15 0 MO PW FAIRFIELD JEFFERSON, COUNTY OF KAH677 458.57500 2005-10-12 15 0 MO PW JEFFERSON, COUNTY OF KAH677 460.10000 2005-10-12 15 0 MO PW FAIRFIELD JEFFERSON, COUNTY OF KAH677 460.10000 2005-10-12 15 0 MO PW JEFFERSON, COUNTY OF KAH677 460.30000 2005-10-12 15 0 MO PW FAIRFIELD JEFFERSON, COUNTY OF KAH677 460.30000 2005-10-12 15 0 MO PW JEFFERSON, COUNTY OF KAH677 465.10000 2005-10-12 15 0 MO PW FAIRFIELD JEFFERSON, COUNTY OF KAH677 465.10000 2005-10-12 15 0 MO PW JEFFERSON, COUNTY OF KAH677 465.30000 2005-10-12 15 0 MO PW FAIRFIELD JEFFERSON, COUNTY OF KAH677 465.30000 2005-10-12 15 0 MO PW JEFFERSON, COUNTY OF KAH677 465.45000 2005-10-12 15 0 MO PW FAIRFIELD JEFFERSON, COUNTY OF KAH677 465.45000 2005-10-12 15 0 MO PW JEFFERSON, COUNTY OF KAH677 465.50000 2005-10-12 15 0 MO PW FAIRFIELD JEFFERSON, COUNTY OF KAH677 465.50000 2005-10-12 15 0 MO PW
KQS578 45.56000 2003-05-13 10 0 MO PW FAIRFIELD FAIRFIELD, CITY OF KQS578 45.56000 2003-05-13 1 0 FB PW FAIRFIELD FAIRFIELD, CITY OF WPJN903 154.22000 2001-08-21 1 0 FB PW FAIRFIELD FAIRFIELD, CITY OF WPJN903 154.22000 2001-08-21 25 0 MO PW FAIRFIELD FAIRFIELD, CITY OF WPJN903 154.28000 2001-08-21 1 0 FB PW FAIRFIELD FAIRFIELD, CITY OF WPJN903 154.28000 2001-08-21 25 0 MO PW FAIRFIELD IOWA HOMELAND SECURITY REGION #5 WQER661 4940.00000 2006-03-30 0 0 PA FAIRFIELD IOWA HOMELAND SECURITY REGION #5 WQER661 4940.00000 2006-03-30 0 0 PA IOWA, STATE OF KUV801 154.66500 2002-01-18 1 0 FX1 PW FAIRFIELD IOWA, STATE OF KUV801 154.80000 2002-01-18 1 0 FX1 PW FAIRFIELD IOWA, STATE OF KUV801 155.37000 2002-01-18 1 0 FB PW FAIRFIELD IOWA, STATE OF KUV801 155.56500 2002-01-18 1 0 FB PW FAIRFIELD IOWA, STATE OF KUV801 155.56500 2002-01-18 1 0 FB2 PW FAIRFIELD IOWA, STATE OF KUV801 155.70000 2002-01-18 1 0 FB PW FAIRFIELD IOWA, STATE OF KUV801 155.70000 2002-01-18 1 0 FB2 PW FAIRFIELD IOWA, STATE OF WPWP853 155.98500 2003-01-02 1 0 FX1 PW FAIRFIELD IOWA, STATE OF WPWP853 155.98500 2003-01-02 50 0 MO PW FAIRFIELD IOWA, STATE OF WPMA712 155.98500 2003-11-04 1 0 FB PW FAIRFIELD IOWA, STATE OF KNT66 155.98500 2003-12-03 1 0 FX1 PW FAIRFIELD IOWA, STATE OF WPMA712 156.06000 2003-11-04 1 0 FX1 PW FAIRFIELD IOWA, STATE OF KNT66 156.06000 2003-12-03 1 0 FX1 PW FAIRFIELD IOWA, STATE OF KNT66 156.07500 2003-12-03 1 0 FX1 PW FAIRFIELD IOWA, STATE OF KNT66 156.10500 2003-12-03 1 0 FX1 PW FAIRFIELD IOWA, STATE OF WPMA712 158.89500 2003-11-04 1 0 FX1 PW FAIRFIELD IOWA, STATE OF WPWP853 158.89500 2003-01-02 1 0 FB2C PW FAIRFIELD IOWA, STATE OF KNT66 159.12000 2003-12-03 1 0 FB PW FAIRFIELD IOWA, STATE OF KNT66 159.12000 2003-12-03 1 0 FB2C PW FAIRFIELD IOWA, STATE OF KNT66 159.16500 2003-12-03 1 0 FB2C PW FAIRFIELD IOWA, STATE OF KNT66 159.16500 2003-12-03 1 0 FB PW FAIRFIELD IOWA, STATE OF KNT66 159.18000 2003-12-03 1 0 FB2C PW FAIRFIELD IOWA, STATE OF WPMA712 159.18000 2003-11-04 1 0 FB PW FAIRFIELD IOWA, STATE OF KNT66 159.18000 2003-12-03 1 0 FB PW FAIRFIELD IOWA, STATE OF KNT66 159.19500 2003-12-03 1 0 FB PW FAIRFIELD JEFFERSON COUNTY AREA AMBULANCE COR WQDN678 155.40000 2005-10-11 1 0 FB PW FAIRFIELD JEFFERSON COUNTY AREA AMBULANCE COR WQDN678 155.40000 2005-10-11 25 0 MO PW FAIRFIELD JEFFERSON COUNTY HOSPITAL WPEA560 153.84500 2003-12-31 15 0 MO PW JEFFERSON COUNTY HOSPITAL WPEA560 153.84500 2003-12-31 15 0 MO PW FAIRFIELD JEFFERSON COUNTY HOSPITAL WPEA560 155.20500 2003-12-31 1 0 FB PW JEFFERSON COUNTY HOSPITAL WPEA560 155.20500 2003-12-31 12 0 MO PW JEFFERSON COUNTY HOSPITAL WPEA560 155.20500 2003-12-31 1 0 FB PW FAIRFIELD JEFFERSON COUNTY HOSPITAL WPEA560 155.20500 2003-12-31 12 0 MO PW FAIRFIELD JEFFERSON COUNTY HOSPITAL WPEA560 155.30250 2003-12-31 8 0 MO PW JEFFERSON COUNTY HOSPITAL WPEA560 155.30250 2003-12-31 8 0 MO PW FAIRFIELD JEFFERSON COUNTY HOSPITAL WPEA560 155.34000 2003-12-31 1 0 FB PW JEFFERSON COUNTY HOSPITAL WPEA560 155.34000 2003-12-31 12 0 MO PW JEFFERSON COUNTY HOSPITAL WPEA560 155.34000 2003-12-31 1 0 FB PW FAIRFIELD JEFFERSON COUNTY HOSPITAL WPEA560 155.34000 2003-12-31 12 0 MO PW FAIRFIELD JEFFERSON COUNTY HOSPITAL WPEA560 158.80500 2003-12-31 15 0 MO PW JEFFERSON COUNTY HOSPITAL WPEA560 158.80500 2003-12-31 1 0 FB2 PW JEFFERSON COUNTY HOSPITAL WPEA560 158.80500 2003-12-31 15 0 MO PW FAIRFIELD JEFFERSON COUNTY HOSPITAL WPEA560 158.80500 2003-12-31 1 0 FB2 PW FAIRFIELD JEFFERSON COUNTY HOSPITAL WPEA560 163.24250 2003-12-31 8 0 MO PW JEFFERSON COUNTY HOSPITAL WPEA560 163.24250 2003-12-31 8 0 MO PW FAIRFIELD JEFFERSON COUNTY HOSPITAL WPEA560 163.25000 2003-12-31 1 40 FB PW JEFFERSON COUNTY HOSPITAL WPEA560 163.25000 2003-12-31 1 40 FB PW FAIRFIELD JEFFERSON, COUNTY OF KWM583 151.02500 2004-01-01 1 0 FB2 PW FAIRFIELD JEFFERSON, COUNTY OF KAH677 154.80000 2005-10-12 1 0 FX1 PW JEFFERSON, COUNTY OF KAH677 154.80000 2005-10-12 55 0 MO PW FAIRFIELD JEFFERSON, COUNTY OF KAH677 154.80000 2005-10-12 55 0 MO PW JEFFERSON, COUNTY OF KAH677 154.80000 2005-10-12 1 0 FX1 PW FAIRFIELD JEFFERSON, COUNTY OF KAH677 155.01000 2005-10-12 1 10 FB PW FAIRFIELD JEFFERSON, COUNTY OF KAH677 155.01000 2005-10-12 1 10 FBS PW JEFFERSON, COUNTY OF KAH677 155.01000 2005-10-12 55 0 MO PW FAIRFIELD JEFFERSON, COUNTY OF KAH677 155.01000 2005-10-12 1 10 FB PW JEFFERSON, COUNTY OF KAH677 155.01000 2005-10-12 55 0 MO PW JEFFERSON, COUNTY OF KAH677 155.01000 2005-10-12 1 10 FBS PW FAIRFIELD JEFFERSON, COUNTY OF KAH677 155.05500 2005-10-12 1 100 FB PW FAIRFIELD JEFFERSON, COUNTY OF KAH677 155.05500 2005-10-12 1 100 FB PW JEFFERSON, COUNTY OF KAH677 155.05500 2005-10-12 100 0 MO PW FAIRFIELD JEFFERSON, COUNTY OF KAH677 155.05500 2005-10-12 100 0 MO PW JEFFERSON, COUNTY OF KAH677 155.37000 2005-10-12 1 10 FB PW JEFFERSON, COUNTY OF KAH677 155.37000 2005-10-12 1 10 FB PW FAIRFIELD JEFFERSON, COUNTY OF KAH677 155.47500 2005-10-12 1 10 FBS PW JEFFERSON, COUNTY OF KAH677 155.47500 2005-10-12 1 10 FB PW JEFFERSON, COUNTY OF KAH677 155.47500 2005-10-12 55 0 MO PW FAIRFIELD JEFFERSON, COUNTY OF KAH677 155.47500 2005-10-12 55 0 MO PW JEFFERSON, COUNTY OF KAH677 155.47500 2005-10-12 1 10 FBS PW FAIRFIELD JEFFERSON, COUNTY OF KAH677 155.47500 2005-10-12 1 10 FB PW FAIRFIELD JEFFERSON, COUNTY OF KAH677 155.53500 2005-10-12 1 10 FB PW JEFFERSON, COUNTY OF KAH677 155.53500 2005-10-12 1 10 FB PW FAIRFIELD JEFFERSON, COUNTY OF KAH677 155.85000 2005-10-12 55 0 MO PW FAIRFIELD JEFFERSON, COUNTY OF KAH677 155.85000 2005-10-12 55 0 MO PW JEFFERSON, COUNTY OF KAH677 155.91000 2005-10-12 55 0 MO PW FAIRFIELD JEFFERSON, COUNTY OF KAH677 155.91000 2005-10-12 55 0 MO PW JEFFERSON, COUNTY OF KAH677 155.92500 2005-10-12 55 0 MO PW FAIRFIELD JEFFERSON, COUNTY OF KAH677 155.92500 2005-10-12 55 0 MO PW JEFFERSON, COUNTY OF KWM583 156.24000 2004-01-01 20 0 MO PW FAIRFIELD JEFFERSON, COUNTY OF KWM583 156.24000 2004-01-01 2 0 FX1 PW FAIRFIELD JEFFERSON, COUNTY OF KAH677 458.57500 2005-10-12 15 0 MO PW FAIRFIELD JEFFERSON, COUNTY OF KAH677 458.57500 2005-10-12 15 0 MO PW JEFFERSON, COUNTY OF KAH677 460.10000 2005-10-12 15 0 MO PW FAIRFIELD JEFFERSON, COUNTY OF KAH677 460.10000 2005-10-12 15 0 MO PW JEFFERSON, COUNTY OF KAH677 460.30000 2005-10-12 15 0 MO PW FAIRFIELD JEFFERSON, COUNTY OF KAH677 460.30000 2005-10-12 15 0 MO PW JEFFERSON, COUNTY OF KAH677 465.10000 2005-10-12 15 0 MO PW FAIRFIELD JEFFERSON, COUNTY OF KAH677 465.10000 2005-10-12 15 0 MO PW JEFFERSON, COUNTY OF KAH677 465.30000 2005-10-12 15 0 MO PW FAIRFIELD JEFFERSON, COUNTY OF KAH677 465.30000 2005-10-12 15 0 MO PW JEFFERSON, COUNTY OF KAH677 465.45000 2005-10-12 15 0 MO PW FAIRFIELD JEFFERSON, COUNTY OF KAH677 465.45000 2005-10-12 15 0 MO PW JEFFERSON, COUNTY OF KAH677 465.50000 2005-10-12 15 0 MO PW FAIRFIELD JEFFERSON, COUNTY OF KAH677 465.50000 2005-10-12 15 0 MO PW
Where can you purchase a bearcat scanner?
One can purchase a Bearcat scanner from many online retailers as well as a few box stores. The box stores that carry this scanner would be Academy, Walmart or Target to name a few.
What are the scanner frequencies for New Ipswich NH 03071 area?
For a comprehensive database of active frequencies and systems in your area, and a lot of other useful scanning information, visit the related link below.
What does squelch mean on airband radios?
The squelch adjustment sets a threshold for the signals/transmissions that you hear -- it lets you listen to actual transmissions without hearing the "dead" noise when a frequency is not active. With the radio on and set to a specific frequency, turn the squelch down until you hear the noise, then turn it up slowly until the noise stops. This will be the ideal squelch/threshold setting for that particular frequency, and you may need to adjust the setting for other frequencies.
Police need codes for your radio scanner where are codes for fire and police for scanner?
the best place to go is radio shack and buy a code book or most radio shacks will give a readout of area codes for free. call them and find out.
What are Beaufort county South Carolina sheriff dept radio frequency for a programmable scanner?
For a comprehensive database of active frequencies in your area, along with a lot of other useful scanning information, visit:
www.RadioReference.com
What are the scanner frequencies for lake okeechobee Florida?
For a comprehensive database of active frequencies and systems in your area, and a lot of other useful scanning information, visit the related link below.
A conventional VOR (CVOR) has three Amplitude Modulated (AM) signals encoded on a VHF carrier:
1) a 30 Hz variable (VAR), which is modulated by the antenna, not the transmitter;
2) a 9960 Hz subcarrier, which is in turn frequency modulated (FM) with a 30 Hz reference (REF) signal;
3) and a voice / identifier channel, which includes 1020 Hz "Morse code" identifiers and aural voice signals.
The 9960 Hz subcarrier and the voice / identifier channel is the same for CVOR and Doppler VOR (DVOR). The explanation for the generation of the VAR signal offered below applies to CVOR. For explanation of the VAR signal of DVOR, see http://wiki.answers.com/Q/Explain%20both%20doppler%20aswell%20as%20convenional%20vor.
The VAR signal is created by spinning a slightly directional antenna at 1800 rpm (30 revolutions per second). The phase of this 30 Hz signal is variable, dependent on the location of the receiver.
To determine VOR bearing, another 30 Hz signal is required. The REF signal is perceived as being the same phase regardless of position of the receiver relative to the VOR.
Here is the problem: the VAR 30 Hz signal is already modulated on the carrier. If the REF 30 Hz signal is modulated onto the carrier without processing, a receiver would find two 30 Hz signals (just one signal if REF and VAR signals are in phase). How would the receiver know which signal is the REF and which is the VAR?
To get around this problem, the VOR takes a 9960 Hz carrier and frequency modulates this carrier with the REF 30 Hz signal. The modulation index is 15, meaning the 9960 carrier has a deviation of 450 Hz (30 Hz times 15). In other words, the subcarrier varies between 9510 Hz to 10410 Hz (9960 +&- 450 Hz). This frequency excursion occurs 30 times per second (30 Hz). The subcarrier signal spectrum does not overlap with the spectra of the VAR or aural signal; therefor it can be amplitude modulated on the RF carrier.
The reason for frequency modulation of the REF signal on the 9960 carrier, as opposed to amplitude modulating the REF signal, is that the AM detector in a VOR receiver would still output two 30 Hz ambiguous signals and a 9960 signal, all summed together.
The VOR instrumentation processor takes the detected VOR signal (called VOR composite video signal (COMP)), and processes the signal as follows:
1) COMP is processed through a low pass filter that preserves 30 Hz to get the VAR signal;
2) COMP is processed through a high pass filter to reject the VAR and aural signals, then an amplitude limiter, and then though an FM detector to get the REF signal. The FM detector could be a discriminator (used in the bad old days), or a phase lock loop (used in modern equipment);
3) COMP is not processed by VOR instrumentation; however it may be filtered to please the listener, i.e. range filter (1020 Hz bandpass), voice filter (200 to 3000 Hz bandpass). VOR bearing (magnetic direction away from the VOR) is simply the phase angle of the VAR signal minus the phase angle of the REF signal.
Why 9960 Hz and not something lower? The baseband spectrum of the whole VOR signal consists of a reasonably narrow 30 Hz signal (VAR), the aural / ident signal (approximately 200 Hz to 3000 Hz), and the 9960 subcarrier (9510 to 10410 Hz). No overlap can be allowed. Also, the receiver has to separate the signals; therefore a significant gap between the signals is provided.
A Doppler VOR varies from a conventional VOR in that the VAR channel is 30 Hz frequency modulated instead of 30 Hz amplitude modulated. The spectrum of the CVOR REF signal is a narrow signal at the RF carrier frequency (fc) (between 108 to 117.95 MHz), and two side bands, one at fc + 30 Hz and the other at fc - 30 Hz. The DVOR REF signal has the same spectrum components as the CVOR REF signal, with the addition of sidebands at (plus and minus) 60 Hz, 90 Hz, 120 Hz ... and on (diminishing in amplitude). The VOR receiver does react to the sidebands at 60 Hz and above because the VAR signal is separated by a low pass filter; therefore it does not matter to the receiver whether the signal comes from a CVOR or DVOR.
What is squelch on a police scanner?
The high frequencies used on scanner channels cross over into the area where there is a lot of random "white noise", a harsh, loud "hiss". Squelch turns the gain down below the hiss, but hopefully not below the signal. It has to be adjusted carefully, otherwise you eliminate the signal along with the noise.
How do you find frequency information for your area?
To find frequency information, check out Policescanners.net. PoliceScanners.net is a resource for the radio community, as well as anyone looking to get involved in the hobby or in need of a scanner as a communications tool. Policescanner.net provides its users with scanner comparisons, a scanner database for every county in the nation, programming options, and other features to help scanner hobbyists decide the best scanner for their location and situation, with just a few simple keystrokes.
Where can you find local police scanner frequencies for Arkansas?
For a comprehensive database of active frequencies in your area, along with a lot of useful scanning information, visit:
www.RadioReference.com
How accurately does a police scanner measure the speed of a vehicle?
Modern police scanners are accurate to with about 3 mph.
Scanner frequency Kentucky Floyd county?
There are several different scanner frequencies for Floyd County in Kentucky. The 911 dispatcher frequency is 154.80000. Law enforcement is 154.81500, 155.31000 or 155.06250.
Dose any out there know how old this radio shack scanner a pro 2018 or how you can get a manual?
The pro 2018 two hundred desktop scanner's manual has a date on it as 2002.
The manual can be found at the Radio Shack website listed as a click able link below in the Related Links section. The manual is in PDF format.
What does a scanner operate similar to?
A scanner operates similarly to a photocopier, as both devices capture physical documents and convert them into a digital format. Like a camera, a scanner uses light to capture images of the document, translating the visual information into data that can be processed and stored on a computer. Additionally, it shares similarities with a fax machine, as it transmits information electronically after scanning.
