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Coax data
A better picture
CB channel grid
Cordless phones
License-free QRG:s
Meteor showers
NOAA WX channels
Scanning tips
Various PLL circuits
Coax connectors
dBm/dBV/Pwr W/Pwr dBW/RMS/V p-p table





Last modified 2014-04-14
In this area, you will find info on frequencies, hints, tips and other hopefully interesting stuff.

Your IP-number is:

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.

TypeOuter
diam.
Bending
radius
Imp.Vel.Kg/100mpF/m1014283050100144200300400435450500800900100012961500180023002400300050005800600010000
Aircell 55.025500.823.6822.93


6.619.411.3313.4116.53
20.3
21.5727.62
31.0935.7138.6342.63
49.8756.3975.05

112.0
Aircell 77.325500.837.2742.23.43.7
4.526.287.69.0411.2
13.8
14.7219.0
21.5224.8427.0830.0
35.640.88

64.9
Aircom Plus10.855500.8515.0840.9



3.34.5


8.2




14.5


23.0




Andrew C2FP10.1625.4500.8513.078.4


2.53.2
4.95.8


8.8

12.7

16.718.4
21.525



Andrew LDF2-50 3/8"11.1741500.8812.0751.05

1.842.43.424.154.96.067.05
7.517.9510.210.911.5513.114.441618.4
21.428.8


Cellflex LCF 12-5016.27050
22
0.67

1.17
2.16
3.13.8

4.7

6.8

99.911.4
13.2



Cellflex LCF 58-5021.49050
37
0.5

0.88
1.64
2.352.91

3.6

5.3

77.89
10.5



Cellflex LCF 78-502812050
53
0.35

0.62
1.15
1.662.07

2.58

3.8

5.15.76.6
7.7



Cellflex LCF 114-5039.420050
105
0.28

0.49
0.93
1.351.7

2.14

3.2

4.44.95.7
6.8



Cellflex LCF 158-505130050
153
0.21

0.37
0.7
1.031.3

1.65

2.51

3.53.94.6
5.2



Cellflex SCF 14-507.82550
7
1.81

3.2
5.8
8.310.3

12.7

18.4

24.326.931
36



Cellflex SCF 38-5010.22550
12
1.31

2.29
4.2
67.5

9.2

13.3

17.619.422.3
25.9



Cellflex SCF 12-5013.73250
21
1.03

1.8
3.3
4.85.9

7.3

10.6

1415.517.8
20.7



CFD-40010.325.4500.851078.5


2.32.9
4.8



8.8

12.8

16.7

21.9
34


Ecoflex 1010.240500.8513.1771.2


2.844.95.87.3
9
9.612.5
14.216.517.919.9
23.62737
41.5
Ecoflex 1514.670500.8625.8770.86


1.962.813.44.055
6.2
6.78.6
9.811.412.413.8
16.318.725.7
28.8
H-439.8100750.859.1521.2


2.53.7



8.0




14.3


23.7




H-1009.8
500.84
80




4.5



















H-1555.435500.813.8823.03.44.9
6.59.311.2
16.319.019.920.321.526.529.830.934.9
42.5
46.951.6
73.8

H-5009.875500.8113.5821.3


2.94.1



9.3




16.8


24.5




H-100010.375500.8314.080
1.42.0
2.73.94.8


8.5




15.7


23.0




H-2000 Flex10.350500.8314.0801.21.42.0
2.73.94.8
78.28.5

11.912.813.515.7
18.821.823.0
34.8

54
HDF-2005
50





5.8

13



22.8




42.3

55.4




HDF-40010.3
50





2.2

5



8.9




16.8

22




TypeOuter
diam.
Bending
radius
Imp.Vel.Kg/100mpF/m1014283050100144200300400435450500800900100012961500180023002400300050005800600010000
LMR-40010.325.4500.851078.4


2.22.9
4.96


8.9

12.8

16.818.6
22
33


LMR-6001538.1500.872076.6


1.41.8
3.13.8


5.6

8.2

10.912.1
14.3
21.5


RG-1110.350750.6613.967



4.66.9



18.0




30.0








RG-58 M17/28 (1084)4.9525500.663.61014.5


9.915.2
21.6



34.3

53.7




107.5



RG-58/AU4.9525.4500.66
97.85.0


1218
27
41



6975









RG-58/CU5.030500.664.0101
6.28.0
11.015.617.8


33.0
36.144.149.6
65.0


100.0




RG-58/LL4.9525.4500.66
97.8




12.2


24.6




42.7

59.1






RG-58/U4.9525.4500.66
97.83.9


8.913.1
19.0
27.9



51.367.3









RG-596.1530750.665.767




12.0



25.0




33.6








RG-174U2.815500.66
101




30.9



















RG-1882.76500.7
96



15.827.4
36.1
54.9



77.587.9









RG-213U10.3110500.6615.51012.2
3.1
4.46.27.9


15.0




27.5


47.0




RG-214U10.850500.66
1002

3.74.878.510.212.91516
172312.6283133.838
45.8




RG-217U13.8
500.66
971.4


3.34.6
7
10.3




19.3




43



RG-2235.425500.666.0101
6.17.9
11.015.017.6


















RG-316/U2.530500.71.594




26.7
37.946.657.4

60.576.981.786.3
106.4117132.9135.9




Suhner S 12272-0415150500.8219.1821.0


2.03.03.54.05.06.06.66.87.09.01011

15
1922



Suhner Sucofeed 1/2"1670500.882576




2.32.7


4.8




7.8


1214



Suhner Sucofeed 7/8"27.8120500.8759.876.5




1.31.5


2.8




4.8


6.98.0



Suhner Sucofeed 1-1/4"39.5200500.879478




0.851.1


1.9




3.5


5.05.8



Suhner Sucofeed 1-5/8"50300500.8714577.5




0.70.8


1.6




3.0


4.35.1






How to take a better picture

First a disclaimer: I am NOT a professional photographer, and I do not claim to be a hot-shot amateur ditto either, but....

...after seeing hundreds of rig-shots taken by various people, I must say that a brief "how-to" is apropriate here. Quite a lot of pictures are taken point blank, with a flash! Hmm. Imagine that radio's reflective, shiny front panel with a flash, in a straight angle right into it. I'm sorry, but this does NOT make a good picture. If a flash is arranged in this way, you will only end up with a bright over-exposed spot in the middle.

When I want to take a picture, I arrange the radio on a dark surface, facing a window (at a slight angle) during a fairly sunny day, thus NOT using a flash at all. With this arrangement, I get a smooth, even illumination of the radio. Then I power it up to light up any display, LED or lamp. The picture is then taken from a slightly elevated angle to give the picture some degree of perspective. It certainly helps if you use a manual camera where you are in control of exposure timing and aperture settings. Use a small aperture and longer exposure. Use a stand to avoid fuzzy pictures. If your camera has a zoom lens, it's best to back away from the target and zoom it instead to minimize picture distortion. It may take some experimentation but the result is definitely worth the effort.


CB channel grid

NB! Most of the columns in this grid are illegal for CB use in just about every country in the world (with maybe one or two exceptions).
Column D is legal, widespread and also license free in many countries. The UK allows both column D and the unique CB27/81.
Germany also has its own 40 channel allocation plus the regular 40 in column D. The A or "Alpha" channels in column D are normally
NOT allowed for communication as they are reserved for R/C models and baby monitors.

All channels between 28.000-29.700 MHz belong to the 10 m amateur band. Do NOT transmit there without a valid amateur radio license.

Channel-ABCD
CEPT/EU/US
EFGHIJUK
CB27/81
PolandGermanyNew Zealand
125.16525.61526.06526.51526.96527.41527.86528.31528.76529.21529.66527.6012526.96026.56526.330
225.17525.62526.07526.52526.97527.42527.87528.32528.77529.22529.67527.6112526.97026.57526.340
325.18525.63526.08526.53526.98527.43527.88528.33528.78529.23529.68527.6212526.98026.58526.350
3 A25.19525.64526.09526.54526.99527.44527.89528.34528.79529.24529.695-26.990-26.360
425.20525.65526.10526.55527.00527.45527.90528.35528.80529.25529.70527.6312527.00026.59526.370
525.21525.66526.11526.56527.01527.46527.91528.36528.81529.26529.71527.6412527.01026.60526.380
625.22525.67526.12526.57527.02527.47527.92528.37528.82529.27529.72527.6512527.02026.61526.390
725.23525.68526.13526.58527.03527.48527.93528.38528.83529.28529.73527.6612527.03026.62526.400
7 A25.24525.69526.14526.59527.04527.49527.94528.39528.84529.29529.745-27.040-26.410
825.25525.70526.15526.60527.05527.50527.95528.40528.85529.30529.75527.6712527.05026.63526.420
925.26525.71526.16526.61527.06527.51527.96528.41528.86529.31529.76527.6812527.06026.64526.430
1025.27525.72526.17526.62527.07527.52527.97528.42528.87529.32529.77527.6912527.07026.65526.440
1125.28525.73526.18526.63527.08527.53527.98528.43528.88529.33529.78527.7012527.08026.66526.450
11 A25.29525.74526.19526.64526.09527.54527.99528.44528.89529.34529.795-27.090-26.460
1225.30525.75526.20526.65527.10527.55528.00528.45528.90529.35529.80527.7112527.10026.67526.470
1325.31525.76526.21526.66527.11527.56528.01528.46528.91529.36529.81527.7212527.11026.68526.480
1425.32525.77526.22526.67527.12527.57528.02528.47528.92529.37529.82527.7312527.12026.69526.490
1525.33525.78526.23526.68527.13527.58528.03528.48528.93529.38529.83527.7412527.13026.70526.500
15 A25.34525.79526.24526.69527.14527.59528.04528.49528.94529.39529.845-27.140-26.510
1625.35525.80526.25526.70527.15527.60528.05528.50528.95529.40529.85527.7512527.15026.71526.520
1725.36525.81526.26526.71527.16527.61528.06528.51528.96529.41529.86527.7612527.16026.72526.530
1825.37525.82526.27526.72527.17527.62528.07528.52528.97529.42529.87527.7712527.17026.73526.540
1925.38525.83526.28526.73527.18527.63528.08528.53528.98529.43529.88527.7812527.18026.74526.550
19 A25.39525.84526.29526.74527.19527.64528.09528.54528.99529.44529.895-27.190-26.560
2025.40525.85526.30526.75527.20527.65528.10528.55529.00529.45529.90527.7912527.20026.75526.570
2125.41525.86526.31526.76527.21527.66528.11528.56529.01529.46529.91527.8012527.21026.76526.580
2225.42525.87526.32526.77527.22527.67528.12528.57529.02529.47529.92527.8112527.22026.77526.590
2325.45525.90526.35526.80527.25527.70528.15528.60529.05529.50529.95527.8212527.25026.78526.620
2425.43525.88526.33526.78527.23527.68528.13528.58529.03529.48529.93527.8312527.23026.79526.600
2525.44525.89526.34526.79527.24527.69528.14528.59529.04529.49529.94527.8412527.24026.80526.610
2625.46525.91526.36526.81527.26527.71528.16528.61529.06529.51529.96527.8512527.26026.81526.630
2725.47525.92526.37526.82527.27527.72528.17528.62529.07529.52529.97527.8612527.27026.82526.640
2825.48525.93526.38526.83527.28527.73528.18528.63529.08529.53529.98527.8712527.28026.83526.650
2925.49525.94526.39526.84527.29527.74528.19528.64529.09529.54529.99527.8812527.29026.84526.660
3025.50525.95526.40526.85527.30527.75528.20528.65529.10529.55530.00527.8912527.30026.85526.670
3125.51525.96526.41526.86527.31527.76528.21528.66529.11529.56530.01527.9012527.31026.86526.680
3225.52525.97526.42526.87527.32527.77528.22528.67529.12529.57530.02527.9112527.32026.87526.690
3325.53525.98526.43526.88527.33527.78528.23528.68529.13529.58530.03527.9212527.33026.88526.700
3425.54525.99526.44526.89527.34527.79528.24528.69529.14529.59530.04527.9312527.34026.89526.710
3525.55525.00526.45526.90527.35527.80528.25528.70529.15529.60530.05527.9412527.35026.90526.720
3625.56526.01526.46526.91527.36527.81528.26528.71529.16529.61530.06527.9512527.36026.91526.730
3725.57526.02526.47526.92527.37527.82528.27528.72529.17529.62530.07527.9612527.37026.92526.740
3825.58526.03526.48526.93527.38527.83528.28528.73529.18529.63530.08527.9712527.38026.93526.750
3925.59526.04526.49526.94527.39527.84528.29528.74529.19529.64530.09527.9812527.39026.94526.760
4025.60526.05526.50526.95527.40527.85528.30528.75529.20529.65530.10527.9912527.40026.95526.770

International SSB calling frequency:27.555
International SSTV frequency:27.700

Cordless phones

This is a tough one as there are a number of bands, legal in one or more countries while illegal in others. There are also those so called "long range" cordless phones, with
output power of 4 to 5 W or more in seemingly random bands. Legality unknown.

The interesting thing to know about all these bands is, that there are always uninformed or ignorant persons that while going for vacation abroad, albeit without criminal
intent, will buy radio related equipment that may or may not be legal in their own countries. Cordless phones is only one example of this. This may not be very widespread
nowadays, but it has been in the past. So, it may be a good thing to keep an eye on those bands that are not allowed in YOUR particular country.

Older analog FM systems are easy to eavesdrop on, but newer digital systems are harder, and some are virtually impossible to intercept. Some systems utilize spread spectrum
technique, while others may employ spectrum inversion scrambling or digital encryption.

Most systems are low power at milliwatt level, with a range of up to a couple of hundred meters, while the "long range" equipment may reach 10-20 Km or beyond depending
on antenna system etc. Well, you get the idea, your eavesdropping success may vary. And by the way, those really old bands, and even withdrawn bands such as the European
CT-1 band may still have users, so don't forget to put them in your scanning list.

And last but not least; make shure you know your local laws. It may be a crime to intercept cordless phone conversations in your country. You have been warned!

Here are a couple of bands/channels/frequencies to start with. They
are all analog FM unless otherwise stated. Frequencies are in MHz:


European CEPT-countries - CT-1 phones
Maximum 10 mW ERP
Allocated around 1985 or so
Withdrawn 2008-12-31
Ch.#Base TXHandset TX
01959.0125914.0125
02959.0375914.0375
03959.0625914.0625
04959.0875914.0875
05959.1125914.1125
06959.1375914.1375
07959.1625914.1625
08959.1875914.1875
09959.2125914.2125
10959.2375914.2375
11959.2625914.2625
12959.2875914.2875
13959.3125914.3125
14959.3375914.3375
15959.3625914.3625
16959.3875914.3875
17959.4125914.4125
18959.4375914.4375
19959.4625914.4625
20959.4875914.4875
21959.5125914.5125
22959.5375914.5375
23959.5625914.5625
24959.5875914.5875
25959.6125914.6125
26959.6375914.6375
27959.6625914.6625
28959.6875914.6875
29959.7125914.7125
30959.7375914.7375
31959.7625914.7625
32959.7875914.7875
33959.8125914.8125
34959.8375914.8375
35959.8625914.8625
36959.8875914.8875
37959.9125914.9125
38959.9375914.9375
39959.9625914.9625
40959.9875914.9875
England/UK - Allocated in 1983
Ch.#Base TXHandset TX
011.64247.45625
021.66247.46875
031.68247.48125
041.70247.49375
051.72247.50625
061.74247.51875
071.76247.53125 or 47.44375
081.78247.54375
England/UK - Allocated in 1996
Ch.#Base TXHandset TX
0131.037539.9375
0231.062539.9625
0331.087539.9875
0431.112540.0125
0531.137540.0375
0631.162540.0625
0731.187540.0875
0831.212540.1125
England/UK - Unknown allocation year
Longer range phones for rural use
Ch.#Base TXHandset TX
0147.4312577.5125
0247.4187577.5500













New Zealand - Valid in february 2012
1.7/40 and 30/40 MHz: Maximum 160 mW ERP
Base units, 30/72 MHz: Maximum 1 W ERP
Handsets, 30/72 MHz: Maximum 500 mW ERP
Ch.#Base TXHandset TX
0130.07539.775
0230.10039.800
0330.12539.825
0430.15039.850
0530.17539.875
0630.20039.900
0730.22539.925
0830.25039.950
0930.27539.975
1030.30040.000
1130.325 or 1.72540.025
1230.35040.050
1330.375 or 1.74040.075
1430.40040.100
1530.425 or 1.75540.125
1630.45040.150
1730.475 or 1.77040.175
1830.50040.200
1930.525 or 1.78540.225
2030.55040.250
2130.57540.275
2230.60040.300 or 72.800
2330.62540.325 or 72.825
2430.65040.350 or 72.850
2530.67540.375 or 72.875
2630.70040.400 or 72.900
2730.72540.425 or 72.925
2830.75040.450 or 72.950
2930.77540.475 or 72.975


















USA - Unknown allocation year
Base unit: AM
Handset: AM or FM?
Ch.#Base TXHandset TX
01A1.69549.930
06A1.70549.830
13A1.76549.860
19A1.79549.875
25A1.82549.890
27A1.73549.845
USA - Allocated in november 1984
Ch.#Base TXHandset TX
0146.61049.670
0246.63049.845
0346.67049.860
0446.71049.770
0546.73049.875
0646.77049.830
0746.83049.890
0846.87049.930
0946.93049.990
1046.97049.970












USA - Allocated in 1993
Maximum 1 mW ERP
Ch.#Base TXHandset TXCh.#Base TXHandset TX
01902.100926.10031903.000927.000
02902.130926.13032903.030927.030
03902.160926.16033903.060927.060
04902.190926.19034903.090927.090
05902.220926.22035903.120927.120
06902.250926.25036903.150927.150
07902.280926.28037903.180927.180
08902.310926.31038903.210927.210
09902.340926.34039903.240927.240
10902.370926.37040903.270927.270
11902.400926.40041903.300927.300
12902.430926.43042903.330927.330
13902.460926.46043903.360927.360
14902.490926.49044903.390927.390
15902.520926.52045903.420927.420
16902.550926.55046903.450927.450
17902.580926.58047903.480927.480
18902.610926.61048903.510927.510
19902.640926.64049903.540927.540
20902.670926.67050903.570927.570
21902.700926.70051903.600927.600
22902.730926.73052903.630927.630
23902.760926.76053903.660927.660
24902.790926.79054903.690927.690
25902.820926.82055903.720927.720
26902.850926.85056903.750927.750
27902.880926.88057903.780927.780
28902.910926.91058903.810927.810
29902.940926.94059903.840927.840
30902.970926.97060903.870927.870
                 USA - Allocated in june 1995
Ch.#Base TXHandset TX
0143.72048.760
0243.74048.840
0343.82048.860
0443.84048.920
0543.92049.020
0643.96049.080
0744.12049.100
0844.16049.160
0944.18049.200
1044.20049.240
1144.32049.380
1244.36049.360
1344.40049.400
1444.46049.460
1544.48049.500
1646.61049.670
1746.63049.845
1846.67049.860
1946.71049.770
2046.73049.875
2146.77049.830
2246.83049.890
2346.87049.930
2446.93049.990
2546.97049.970





Note: The frequencies in pink are shared with baby monitors!

Various "long range" units have been found in the following bands (base/handset):

140/230 MHz
140/250 MHz
145/230 MHz
382/256 MHz
388/262 MHz
394/268 MHz

There are probably other bands used as well. Those mentioned above are just some examples.


License-free QRG:s

FreeNet is used in Germany. Max 500 mW and built-in, non-removable antenna. Possibly scheduled for withdrawal in 2015.
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/KDR for Sweden. Maximum 2 W ERP and built-in, non-removable antenna
SRD860 for Europe (Not all countries though). Maximum 5 mW ERP and built-in, non-removable antenna
934/81 UK was for use in the UK. A maximum of 8 watts output and 8 element beam. Withdrawn 1998-12-31.
2.4 GHz SRD (2.400 - 2.4835 GHz) is for almost worldwide use. Maximum allowed power output differ between countries.

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

SRBR/KDRQRG in MHz
1444.600
2444.650
3444.800
4444.825
5444.850
New 2011444.875
New 2011444.925
6444.975
PMR446QRG in MHz
1446.00625
2446.01875
3446.03125
4446.04375
5446.05625
6446.06875
7446.08125
8446.09375
FreeNetQRG in MHz
1149.0250
2149.0375
3149.0500
4149.0875
5149.1000
6149.1125
934/81 UKQRG 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 JapanQRG 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
FRSQRG 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
MURSQRG in MHz
1151.820
2151.880
3151.940
4154.570
5154.600
SRD860 Band AQRG in MHz
1-48 (12.5 KHz steps)868.00625-868.59375
SRD860 Band BQRG in MHz
1-40 (12.5 KHz steps)868.70625-869.19375
SRD860 Band C1QRG in MHz
1-10 (25 KHz steps)869.4125-869.6375
SRD860 Band C2QRG in MHz
1-4 (25 KHz steps)869.3125-869.3875
SRD860 Band DQRG in MHz
1-24 (12.5 KHz steps)869.70625-869.99375
Most bands use NFM +/- 5 KHz deviation except PMR446, where +/- 2.5 KHz is used.
There is also Digital Voice on PMR446 and 2.4 GHz SRD
Check out
the related area.



Meteor showers

These are the principal meteor showers and their approximate activity dates.

NameTime period
Quadrantids January 1 - January 5
Lyrids April 16 - April 25
Eta Aquarids April 19 - May 28
Perseids July 17 - August 24
Orionids October 2 - November 7
Northern & southern Taurids October 1 - November 25
Leonids November 14 - November 21
Geminids December 7 - December 17

Meteor ping listening tips

Listen in USB mode about 1 KHz below nominal carrier frequency.

SourceQRG (MHz)Notes
BRAMS meteor beacon in Belgium49.970150 W
GRAVES satellite tracking radar in France143.050Several Megawatts ERP


NOAA WX-channels (USA)

Throughout the US, there are about a 1000 transmitters utilized by NOAA and the National Weather Radio (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:

ChannelQRG in MHz
1162.400
2162.425
3162.450
4162.475
5162.500
6162.525
7162.550
All channels use NFM +/- 5 KHz deviation.



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 a setup consisting of:
  1. An Icom IC-R10 hand scanner
  2. A Watson "Super Searcher" (10-3000 MHz RF finder)
  3. A serial 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 Icom CI-V or 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 Icom/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 1500:- SEK in Sweden. In UK the price is 99 (summer 2000).

The Watson Super Searcher comes with rechargable batteries, a wall 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-hyena.

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).


Various PLL circuits

A work in progress. See also the
components page

AN6040C5121CCI3001CCI3002ECG1198ECG1207ECG1233ECG1254
ECG1255HD42851HD42853KM5624LC7110LC7113LC7120LC7130
LC7131LC7132LC7135LC7136LC7137LC7185M58472PM58473P
M58476MB8719MB8733MB8734MC14568MC145104MC145106MC145107
MC145109MM48141MM55106MM55107MM55108NMM55116MM55126MM55104
MM55107MM55108MN6040MN6040AMSC42502PMSM5807MSM5907NDC40013
NIS7261ANIS7264BPLL01APLL02APLL03APLL08APLL0305APLL2001
PLL2002REC86345SM5104SM5107SM5109SM5118SM5123ASM5124A
SM5125BSM5126ASM5126BTC5080PTC9100TC9102PTC9103PTC9105
TC9106TC9109PTC9119PD858CPD861PD2810CPD2812CPD2814
PD2816PD2824PD2833C





Coax connectors - Assembly guides

Another work in progress...

UG-21 STG A professional N-type, male connector
Suitable for RG-213, Aircom Plus, Ecoflex 10,
H-1000 and H-2000 Flex

UHF Spezial A professional PL-259/UHF-type, male connector
Suitable for RG-213, Aircom Plus, Ecoflex 10,
H-1000 and H-2000 Flex

Deltaohm 1/2" A professional coax connector. (Page 1)
Suitable for 1/2" corrugated coax cable


Deltaohm 1/2" A professional coax connector. (Page 2)
Suitable for 1/2" corrugated coax cable


Spinner RFS - General instructions.
Suitable for 7/8" corrugated coax cable


Teracom 7/8" A professional coax connector. (d0 version)
Suitable for 7/8" corrugated coax cable


Teracom 7/8" A professional coax connector. (e0 version)
Suitable for 7/8" corrugated coax cable



Equivalent/conversion table (over 50 ohms) for dBm / dBV / Power W / Power dBW / V RMS / V peak-peak
and calibrated S-meter readings for below and above 30 MHz, according to IARU Reg. 1 recommendation (1981).

dBmdBVPwr WPwr dBWV RMSV p-pS <30 MHzS >30 MHz
-141-34 dBV7.9 aW-171 dBW20 nV56.3 nV
S 1
-140-33 dBV10 aW-170 dBW22 nV63 nV

-139-32 dBV12 aW-169 dBW25 nV70.8 nV

-138-31 dBV16 aW-168 dBW28 nV79.6 nV

-137-30 dBV20 aW-167 dBW30 nV89.3 nV

-136-29 dBV25 aW-166 dBW35 nV0.1 uV

-135-28 dBV32 aW-165 dBW40 nV0.112 uV
S 2
-134-27 dBV40 aW-164 dBW45 nV0.126 uV

-133-26 dBV50 aW-163 dBW50 nV0.141 uV

-132-25 dBV63 aW-162 dBW56 nV0.159 uV

-131-24 dBV79 aW-161 dBW63 nV0.178 uV

-130-23 dBV0.1 fW-160 dBW71 nV0.2 uV

-129-22 dBV0.13 fW-159 dBW80 nV0.224 uV
S 3
-128-21 dBV0.16 fW-158 dBW89 nV0.251 uV

-127-20 dBV0.2 fW-157 dBW0.1 uV0.282 uV

-126-19 dBV0.25 fW-156 dBW0.112 uV0.317 uV

-125-18 dBV0.32 fW-155 dBW0.125 uV0.356 uV

-124-17 dBV0.4 fW-154 dBW0.14 uV0.399 uV

-123-16 dBV0.5 fW-153 dBW0.16 uV0.447 uV
S 4
-122-15 dBV0.6 fW-152 dBW0.18 uV0.5 uV

-121-14 dBV0.8 fW-151 dBW0.2 uV0.56 uVS 1
-120-13 dBV1 fW-150 dBW0.22 uV0.63 uV

-119-12 dBV1.2 fW-149 dBW0.25 uV0.7 uV

-118-11 dBV1.6 fW-148 dBW0.28 uV0.8 uV

-117-10 dBV2 fW-147 dBW0.3 uV0.89 uV
S 5
-116-9 dBV2.5 fW-146 dBW0.35 uV1 uV

-115-8 dBV3.1 fW-145 dBW0.4 uV1.1 uVS 2
-114-7 dBV3.9 fW-144 dBW0.45 u1.26 uV

-113-6 dBV5 fW-143 dBW0.5 uV1.4 uV

-112-5 dBV6.3 fW-142 dBW0.56 uV1.6 uV

-111-4 dBV7.9 fW-141 dBW0.63 uV1.8 uV
S 6
-110-3 dBV10 fW-140 dBW0.71 uV2 uV

-109-2 dBV13 fW-139 dBW0.8 uV2.24 uVS 3
-108-1 dBV16 fW-138 dBW0.89 uV2.51 uV

-1070 dBV20 fW-137 dBW1 uV2.82 uV

-1061 dBV25 fW-136 dBW1.12 uV3.17 uV

-1052 dBV32 fW-135 dBW1.25 uV3.56 uV
S 7
-1043 dBV40 fW-134 dBW1.41 uV3.99 uV

-1034 dBV50 fW-133 dBW1.59 uV4.47 uVS 4
-1025 dBV63 fW-132 dBW1.78 uV5 uV

-1016 dBV79 fW-131 dBW2 uV5.63 uV

-1007 dBV0.1 pW-130 dBW2.24 uV6.3 uV

-998 dBV0.13 pW-129 dBW2.51 uV7.08 uV
S 8
-989 dBV1.6 pW-128 dBW2.82 uV7.96 uV

-9710 dBV0.2 pW-127 dBW3.16 uV8.93 uVS 5
-9611 dBV0.25 pW-126 dBW3.55 uV10 uV

-9512 dBV0.32 pW-125 dBW4 uV11.2 uV

-9413 dBV0.4 pW-124 dBW4.47 uV12.6 uV

-9314 dBV0.5 pW-123 dBW5.01 uV14.1 uV
S 9
-9215 dBV0.63 pW-122 dBW5.62 uV15.9 uV

-9116 dBV0.79 pW-121 dBW6.31 uV17.8 uVS 6
-9017 dBV1 pW-120 dBW7.06 uV19.9 uV

-8918 dBV1.2 pW-119 dBW8 uV22.4 uV

-8819 dBV1.6 pW-118 dBW8.91 uV25.1 uV

-8720 dBV2 pW-117 dBW10 uV28.2 uV

-8621 dBV2.5 pW-116 dBW11.2 uV31.7 uV

-8522 dBV3.2 pW-115 dBW12.5 uV35.6 uVS 7
-8423 dBV4 pW-114 dBW14.1 uV39.9 uV

-8324 dBV5 pW-113 dBW15.9 uV44.7 uV
S 9+10 dB
-8225 dBV6.3 pW-112 dBW17.8 uV50 uV

-8126 dBV7.9 pW-111 dBW19.9 uV56.3 uV

-8027 dBV10 pW-110 dBW22.4 uV63.2 uV

-7928 dBV12 pW-109 dBW25 uV7.08 uVS 8
-7829 dBV16 pW-108 dBW28.1 uV79.6 uV

-7730 dBV20 pW-107 dBW31.5 uV89.3 uV

-7631 dBV25 pW-106 dBW35.4 uV0.1 mV

-7532 dBV31 pW-105 dBW39.7 uV0.112 mV

-7433 dBV40 pW-104 dBW44.6 uV0.126 mV

-7334 dBV50 pW-103 dBW50 uV0.141 mVS 9S 9+20 dB
-7235 dBV63 pW-102 dBW56 uV0.159 mV

-7136 dBV79 pW-101 dBW63 uV0.178 mV

-7037 dBV0.1 nW-100 dBW70.8 uV0.2 mV

-6938 dBV0.12 nW-99 dBW79.3 uV0.224 mV

-6839 dBV0.16 nW-98 dBW89 uV0.251 mV

-6740 dBV0.2 nW-97 dBW99.8 uV0.282 mV

-6641 dBV0.25 nW-96 dBW0.12 mV0.317 mV

-6542 dBV0.31 nW-95 dBW0.126 mV0.356 mV

-6443 dBV0.4 nW-94 dBW0.141 mV0.399 mV

-6344 dBV0.5 nW-93 dBW0.16 mV0.447 mVS 9+10 dBS 9+30 dB
-6245 dBV0.63 nW-92 dBW0.178 mV0.5 mV

-6146 dBV0.79 nW-91 dBW0.199 mV0.563 mV

-6047 dBV1 nW-90 dBW0.224 mV0.63 mV

-5948 dBV1.2 nW-89 dBW0.25 mV0.708 mV

-5849 dBV1.6 nW-88 dBW0.281 mV0.796 mV

-5750 dBV2 nW-87 dBW0.315 mV0.893 mV

-5651 dBV2.5 nW-86 dBW0.354 mV1 mV

-5552 dBV3.1 nW-85 dBW0.397 mV1.12 mV

-5453 dBV4 nW-84 dBW0.446 mV1.26 mV

-5354 dBV5 nW-83 dBW0.5 mV1.41 mVS 9+20 dBS 9+40 dB
-5255 dBV6.3 nW-82 dBW0.56 mV1.59 mV

-5156 dBV7.9 nW-81 dBW0.63 mV1.78 mV

-5057 dBV10 nW-80 dBW0.707 mV2 mV

-4958 dBV12 nW-79 dBW0.793 mV2.24 mV

-4859 dBV16 nW-78 dBW0.89 mV2.51 mV

-4760 dBV20 nW-77 dBW0.998 mV2.82 mV

-4661 dBV25 nW-76 dBW1.2 mV3.17 mV

-4562 dBV31 nW-75 dBW1.26 mV3.56 mV

-4463 dBV40 nW-74 dBW1.41 mV3.99 mV

-4364 dBV50 nW-73 dBW1.6 mV4.47 mVS 9+30 dBS 9+50 dB
-4265 dBV63 nW-72 dBW1.78 mV5 mV

-4166 dBV79 nW-71 dBW1.99 mV5.63 mV

-4067 dBV0.1 uW-70 dBW2.24 mV6.3 mV

-3968 dBV0.12 uW-69 dBW2.5 mV7.08 mV

-3869 dBV0.16 uW-68 dBW2.81 mV7.96 mV

-3770 dBV0.2 uW-67 dBW3.15 mV8.93 mV

-3671 dBV0.25 uW-66 dBW3.54 mV10 mV

-3572 dBV0.31 uW-65 dBW3.97 mV11.2 mV

-3473 dBV0.4 uW-64 dBW4.46 mV12.6 mV

-3374 dBV0.5 uW-63 dBW5 mV14.1 mVS 9+40 dBS 9+60 dB
-3275 dBV0.63 uW-62 dBW5.6 mV15.9 mV

-3176 dBV0.79 uW-61 dBW6.3 mV17.8 mV

-3077 dBV1 uW-60 dBW7.06 mV19.9 mV

-2978 dBV1.2 uW-59 dBW7.9 mV22.4 mV

-2879 dBV1.6 uW-58 dBW8.9 mV25.1 mV

-2780 dBV2 uW-57 dBW9.98 mV28.2 mV

-2681 dBV2.5 uW-56 dBW12 mV31.7 mV

-2582 dBV3.1 uW-55 dBW12.6 mV35.6 mV

-2483 dBV4 uW-54 dBW14.1 mV39.9 mV

-2384 dBV5 uW-53 dBW16 mV44.7 mVS 9+50 dB
-2285 dBV6.3 uW-52 dBW17.8 mV50 mV

-2186 dBV7.9 uW-51 dBW19.9 mV56.3 mV

-2087 dBV10 uW-50 dBW22.4 mV63 mV

-1988 dBV12 uW-49 dBW25 mV70.8 mV

-1889 dBV16 uW-48 dBW28.1 mV79.6 mV

-1790 dBV20 uW-47 dBW31.5 mV89.3 mV

-1691 dBV25 uW-46 dBW35.4 mV0.1

-1592 dBV31 uW-45 dBW39.7 mV0.112

-1493 dBV40 uW-44 dBW44.6 mV0.126

-1394 dBV50 uW-43 dBW50 mV0.141S 9+60 dB
-1295 dBV63 uW-42 dBW56 mV0.159

-1196 dBV79 uW-41 dBW63 mV0.178

-1097 dBV0.1 mW-40 dBW70.7 mV0.2

-998 dBV0.12 mW-39 dBW79.3 mV0.224

-899 dBV0.16 mW-38 dBW89 mV0.251

-7100 dBV0.2 mW-37 dBW99.8 mV0.282

-6101 dBV0.25 mW-36 dBW0.1200.317

-5102 dBV0.31 mW-35 dBW0.1260.356

-4103 dBV0.4 mW-34 dBW0.1410.399

-3104 dBV0.5 mW-33 dBW0.1580.447

-2105 dBV0.63 mW-32 dBW0.1780.502

-1106 dBV0.79 mW-31 dBW0.1990.563

0107 dBV1 mW-30 dBW0.2240.632

1108 dBV1.25 mW-29 dBW0.2500.708

2109 dBV1.58 mW-28 dBW0.2810.796

3110 dBV1.99 mW-27 dBW0.3150.893

4111 dBV2.51 mW-26 dBW0.3541.002

5112 dBV3.16 mW-25 dBW0.3971.124

6113 dBV3.98 mW-24 dBW0.4461.261

7114 dBV5.01 mW-23 dBW0.5001.415

8115 dBV6.3 mW-22 dBW0.5611.588

9116 dBV7.94 mW-21 dBW0.6301.782

10117 dBV10 mW-20 dBW0.7072.000

11118 dBV12.58 mW-19 dBW0.7932.244

12119 dBV15.84 mW-18 dBW0.8902.517

13120 dBV19.95 mW-17 dBW0.9982.825

14121 dBV25.11 mW-16 dBW1.1203.169

15122 dBV31.62 mW-15 dBW1.2573.556

16123 dBV39.81 mW-14 dBW1.4103.990

17124 dBV50.11 mW-13 dBW1.5834.477

18125 dBV63.09 mW-12 dBW1.7765.023

19126 dBV79.43 mW-11 dBW1.9925.636

20127 dBV100 mW-10 dBW2.2366.324

21128 dBV125.8 mW-9 dBW2.5087.096

22129 dBV158.5 mW-8 dBW2.8157.962

23130 dBV199.5 mW-7 dBW3.1588.933

24131 dBV251.2 mW-6 dBW3.54310.023

25132 dBV316.2 mW-5 dBW3.97611.246

26133 dBV398.1 mW-4 dBW4.46112.619

27134 dBV501.2 mW-3 dBW5.00514.158

28135 dBV630.9 mW-2 dBW5.61615.886

29136 dBV794.3 mW-1 dBW6.30217.825

30137 dBV1 W0 dBW7.07120.000

31138 dBV1.25 W1 dBW7.93322.440

32139 dBV1.58 W2 dBW8.90125.178

33140 dBV1.99 W3 dBW9.98828.250

34141 dBV2.51 W4 dBW11.20631.697

35142 dBV3.16 W5 dBW12.57435.565

36143 dBV3.98 W6 dBW14.10839.905

37144 dBV5.01 W7 dBW15.83044.774

38145 dBV6.31 W8 dBW17.76150.237

39146 dBV7.94 W9 dBW19.92856.367

40147 dBV10 W10 dBW22.36063.245

41148 dBV12.58 W11 dBW25.08970.962

42149 dBV15.84 W12 dBW28.15079.621

43150 dBV19.95 W13 dBW31.58589.336

44151 dBV25.12 W14 dBW35.439100.23

45152 dBV31.62 W15 dBW39.763112.46

46153 dBV39.81 W16 dBW44.615126.19

47154 dBV50.12 W17 dBW50.059141.58

48155 dBV63.09 W18 dBW56.167158.86

49156 dBV79.43 W19 dBW63.020178.25

50157 dBV100 W20 dBW70.710200.00

51158 dBV125.9 W21 dBW79.338224.40

52159 dBV158.5 W22 dBW89.019251.78

53160 dBV199.5 W23 dBW99.881282.50

54161 dBV251.2 W24 dBW112.06316.97

55162 dBV316.2 W25 dBW125.74355.65

56163 dBV398.1 W26 dBW141.08399.05

57164 dBV501.2 W27 dBW158.30447.74

58165 dBV630.9 W28 dBW177.61502.37

59166 dBV794.3 W29 dBW199.28563.67

60167 dBV1000 W30 dBW223.60632.45

61168 dBV1259 W31 dBW250.89709.62

62169 dBV1585 W32 dBW281.50796.21

63170 dBV1995 W33 dBW315.85893.36

64171 dBV2512 W34 dBW354.391002.37

65172 dBV3162 W35 dBW397.631124.68

66173 dBV3981 W36 dBW446.151261.91

67174 dBV5012 W37 dBW500.591415.89

68175 dBV6309 W38 dBW561.671588.65

69176 dBV7943 W39 dBW630.201782.50

70177 dBV10000 W40 dBW707.102000.00


Please note that some numbers have been slightly rounded.