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Coax Data
License-Free QRG:s
NOAA WX Channels
Scanning Tips
Scanning Tips Update



Here in the United Kingdom, It is quite legal to publish lists of frequencies, But monitoring anything other than commercial or amateur bands or without permission from the user of the frequency is strictly forbidden. (Apart from the Air Band which although strictly speaking is illegal to listen to, but generally the law tends to turn a blind eye to on this frequency) Therefore, Any frequencies published here should be listened to only if you have a legal entitlement to do so.

Coax data

Loss is in dB/100 m. For example, 100 meters of H-2000 Flex will attenuate a 144 MHz signal with 4.8 dB.
Diameter and bending radius is given in millimeters.

TypeDiam.Bending
radius
Imp.Vel.Kg/100mpF/m1014285010014443512962400
Aircell 77.325500.837.274
3.43.74.86.67.914.026.138.0
Aircom Plus10.855500.8515.0840.9


3.34.58.214.523.0
H-2000 Flex10.350500.8314.080
1.42.02.73.94.88.515.723.0
H-100010.375500.8314.080
1.42.02.73.94.88.515.723.0
H-5009.875500.8113.5821.3

2.94.1
9.316.824.5
H-1009.8
500.84
80



4.5



H-439.8100750.859.1521.2

2.53.7
8.014.323.7
LCF 12-5016.27050?22?0.67
< 1.17
2.16< 3< 4.7< 9< 13
LCF 58-5021.49050?37?0.5
< 0.88
1.64< 2.2< 3.5< 7< 10
LCF 78-502812050?53?0.35
< 0.62
1.15< 1.6< 2.5< 5< 7
RG-2235.425500.666.0101
6.17.911.015.017.6


RG-213U10.3110500.6615.51012.2
3.14.46.27.915.027.547.0
RG-174U2.815500.66
101



30.9



RG-596.1530750.665.767



12.0
25.033.6
RG-58CU5.030500.664.0101
6.28.011.015.617.833.065.0100.0
RG-58 others4.932500.783.282


8.311.0
23.044.8
RG-1110.350750.6613.967


4.66.9
18.030.0


License-free Frequencies:

FRS is for use in the US and Canada.
LPD is for european use, sadly in the middle of our 70 cm ham band! Maximum 10 mW ERP and built-in, non-removable antenna. 69 channels between 433.075-434.775 MHz
LPD Japan or "Mini set". Max 10 mW ERP
MURS is for use in the US. Maximum 2 W ERP
PMR446 is for european use. Maximum 0.5 W ERP and built-in, non-removable antenna
PRS/UHF CB is for Malaysia (14 ch), Australia & New Zealand (40 ch) use. Located in the 477 MHz segment. Max 5 W
SRBR SE Swedish version. Maximum 1 W ERP and built-in, non-removable antenna
934 UK was for use in the UK. A maximum of 8 watts output and 8 element beam. Withdrawn 1998-12-31.

FRS = Family Radio Service, LPD = Low Power Device, MURS = Multi-Use Radio System, PMR = Private Mobile Radio, SRBR = Short Range Bussiness Radio

934 UKFrequency in MHz
1934.0125
2934.0625
3934.1125
4934.1625
5934.2125
6934.2625
7934.3125
8934.3625
9934.4125
10934.4625
11934.5125
12934.5625
13934.6125
14934.6625
15934.7125
16934.7625
17934.8125
18934.8625
19934.9125
20934.9625
LPD JapanFrequency in MHz
1422.0500
2422.0625
3422.0750
4422.0875
5422.1000
6422.1125
7422.1250
8422.1375
9422.1500
10422.1625
11422.1750
H1422.2000
H2422.2125
H3422.2250
H4422.2375
H5422.2500
H6422.2625
H7422.2750
H8422.2875
H9422.3000
FRSFrequency in MHz
1462.5625
2462.5875
3462.6125
4462.6375
5462.6625
6462.6875
7462.7125
8467.5625
9467.5875
10467.6125
11467.6375
12467.6625
13467.6875
14467.7125
MURSFrequency in MHz
1151.820
2151.880
3151.940
4154.570
5154.600
SRBR SEFrequency in MHz
1444.600
2444.650
3444.800
4444.825
5444.850
6444.975
PMR446Frequency in MHz
1446.00625
2446.01875
3446.03125
4446.04375
5446.05625
6446.06875
7446.08125
8446.09375
All channels use NFM.
Check out
the related area.



NOAA WX-channels (USA)

Throughout the US, there are over 900 transmitters utilized by
NOAA and the National Weather Service (NWR). They transmit severe weather warnings (such as tornadoes and stuff) to Specialized receivers. These are either stand-alone units or built-in for example into CB-radios. Of course, transmissions are also easily picked up on virtually any scanner. Locations, callsigns and more can be found at this URL. The frequencies are as follows:

ChannelFrequency in MHz
1162.400
2162.425
3162.450
4162.475
5162.500
6162.525
7162.550
All channels use NFM.



Scanning Tips

Now, this is a subject that could fill up many MB:s of text and pictures, but I will limit this section a little bit and write about some perhaps more uncommon stuff you can do.

I have had a blast snooping the airwaves with my setup consisting of:
  1. An AOR AR-8000 hand scanner
  2. A Watson"Super Searcher"(10-3000 MHz RF finder)
  3. A special cable between the above
The Super Searcher is basically a portable, very sensitive frequency counter, connected to an antenna of your choice. It also has the possibility to "reaction tune" any AOR receiver/scanner to the locked frequency. Got the picture yet? Well this is going to be fun. Take this setup out on the road, preferrably to a main street with a lot of traffic, and BINGO! As soon as there is someone fairly close by, pressing the PTT on his/her transceiver, the Super Searcher locks onto the frequency, passes the frequency information to the AOR receiver and voila! With no effort at all, you can listen to, and start logging those presumably unknown frequencies.

I have also done some snooping from the car. By connecting the Super Searcher to an external antenna, the range of detection will be greater. If you drive around your town with this setup, you'll have frequencies and communications popping up as you pass the transmitters. The range of detection is of course depending on several factors: your antenna, the transmitting antenna, the frequency in question and of course the power output.

There are a few drawbacks too. Being a broadband device, the Super Searcher may be blocked when passing certain strong, wideband transmitters such as aviation radar sites, cellular dittos, broadcasting towers and multiple transmitter clusters. To test this, I hooked up the gear and went to Bromma Airport which is close to home, and parked within a 100 meters from the radar ball. This radar operates just above 1.3 GHz (1300 MHz). The Super Searcher could neither detect the Air-to-ground comm's antennas about 25 meters behind the car, nor my very own 2m/70cm/23cm HT with 300 mW output, 20 cm away. I had to move the HT as close as 8-10 cm from the Super Searcher in order for it to detect my transmission. Talk about blocking! This is however a relatively small problem that in practice won't matter that much. The extremist will buy and connect a megabuck preselector with 2 MHz bandwidth, thus selecting a small portion of the spectrum to be detected (you will miss a lot this way). A better approach would probably be a notch filter for 88-108 MHz and maybe a lowpass filter to block everything above, say 480 MHz.

The other drawback is impossible to remedy. The Super Searcher can not detect and pass the mode of transmission. You will have to set it manually on your radio. This is however a minute problem as most comm's except aviation is done with FM.

There are of course other manufacturers with similar devices offering "reaction tune" such as Optoelectronics, but this one won't cost you an arm and a leg. I had mine for only 89 In UK (in 2005).

The Watson Super Searcher comes with built in rechargable battery, a mains Charger and a telescopic antenna. It also has a bargraph to indicate relative signal strength. It's a fun tech-toy and a must-have for the scanner-user.

Of course, a full featured, megabuck spectrum analyzer will do the job under any circumstances (except reaction tune), no matter what the RF environment looks like, but the huge price for such a device is likely to deter most hobbyists (like me) and, it doesn't easily fit in your pocket!.




Scanning Tips Update

There are many Scanners on the market today that have a system called "Close Call" built-in That will detect a signal up to a few streets away
depending on buildings etc. eliminating the need for a seperate Frequency searcher.

I now use an excellant combination of Uniden/Bearcat Scanners consisting of :
  1. A Uniden UBC-3500XLT (for Walkabout)
  2. A Uniden UBC-800XLT (for Mobile use)
  3. A Uniden UBC-800XLT (for Base use)
Below is example from Uniden.

When using Uniden Scanners, There are 3 different "Close Call" settings:
  1. CC DND (Do Not Disturb)
  2. CC PRI
  3. CC OFF
CC DND (Do Not Disturb) - The scanner checks for a Close Call hit every
2 seconds only if the scanner is not currently stopped on a transmission.
If the scanner is on a transmission the scanner waits until the signal ends
to perform a Close Call check. This prevents breaks in audio during the
Close Call checks.

PRI - Close Call works even if there is a transmission. Checks for a Close Call hit every 2 seconds.

CC OFF - Close Call feature is Switched off.

Not only can they detect the
"Frequency" in use, but also can detect the
"Mode" of the Transmission, and even the
"CTCSS" subtone in use as well.



Other Manufacturers might have the "close call" feature by a different name
and, may or may not have these features included so check before you buy


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