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





Last modified 2013-03-24
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 are given in millimeters.

TypeOuter
diam.
Bending
radius
Imp.Vel.Kg/100mpF/m1014283050100144200300400435450500800900100012961500180023002400300050005800600010000
Aircell 55.025500.823.6823.0


6.99.811.314.017.3
21.0
21.627.6
31.135.841.045.3
49.860.481.2
90.4123.0
Aircell 77.325500.837.274
3.43.7
4.86.67.9


14.0




26.1


38.0




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 1010.240500.8613.177





4.8


8.9




16.5


23.1




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 Flex10.350500.8314.080
1.42.0
2.73.94.8


8.5

11.912.8
15.7

21.823.0
34.8


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-214U10.8?50??1002

3.7
7
10.2
15

1723
28









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: 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
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, but these 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.



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
TC9106TC9109PTC9119µPD858CµPD861µPD2810CµPD2812CµPD2814
µPD2816µPD2824µPD2833C





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


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 (50 ohms) for
dBm / dBµV / Power W / Power dBW / V RMS / V peak-peak

dBmdBµVPwr WPwr dBWV RMSV p-p
-124-17 dBµV0.4 fW-154 dBW0.14 uV0.4 uV
-123-16 dBµV0.5 fW-153 dBW0.16 uV0.45 uV
-122-15 dBµV0.6 fW-152 dBW0.18 uV0.5 uV
-121-14 dBµV0.8 fW-151 dBW0.2 uV0.56 uV
-120-13 dBµV1 fW-150 dBW0.22 uV0.63 uV
-119-12 dBµV1.2 fW-149 dBW0.25 uV0.7 uV
-118-11 dBµV1.6 fW-148 dBW0.28 uV0.8 uV
-117-10 dBµV2 fW-147 dBW0.3 uV0.89 uV
-116-9 dBµV2.5 fW-146 dBW0.35 uV1 uV
-115-8 dBµV3.1 fW-145 dBW0.4 uV1.1 uV
-114-7 dBµV3.9 fW-144 dBW0.45 u1.26 uV
-113-6 dBµV5 fW-143 dBW0.5 uV1.4 uV
-112-5 dBµV6.3 fW-142 dBW0.56 uV1.6 uV
-111-4 dBµV7.9 fW-141 dBW0.63 uV1.8 uV
-110-3 dBµV10 fW-140 dBW0.71 uV2 uV
-1007 dBµV0.1 pW-130 dBW2.2 uV6.3 uV
-9017 dBµV1 pW-120 dBW7.1 uV19.9 uV
-8027 dBµV10 pW-110 dBW22 uV63.2 uV
-7037 dBµV0.1 nW-100 dBW71 uV0.2 mV
-6047 dBµV1 nW-90 dBW0.224 mV0.63 mV
-5057 dBµV10 nW-80 dBW0.707 mV2 mV
-4067 dBµV0.1 uW-70 dBW2.2 mV6.3 mV
-3077 dBµV1 uW-60 dBW7 mV19.9 mV
-2087 dBµV10 uW-50 dBW22 mV63 mV
-1097 dBµV0.1 mW-40 dBW71 mV200 mV
0107 dBµV1 mW-30 dBW0.2230.632
1108 dBµV1.25 mW-29 dBW0.2500.709
2109 dBµV1.58 mW-28 dBW0.2810.796
3110 dBµV1.99 mW-27 dBW0.3150.893
4111 dBµV2.51 mW-26 dBW0.3541.002
5112 dBµV3.16 mW-25 dBW0.3971.124
6113 dBµV3.98 mW-24 dBW0.4461.261
7114 dBµV5.01 mW-23 dBW0.5001.415
8115 dBµV6.3 mW-22 dBW0.5611.588
9116 dBµV7.94 mW-21 dBW0.6301.782
10117 dBµV10 mW-20 dBW0.7072.000
11118 dBµV12.58 mW-19 dBW0.7932.244
12119 dBµV15.84 mW-18 dBW0.8902.517
13120 dBµV19.95 mW-17 dBW0.9982.825
14121 dBµV25.11 mW-16 dBW1.1203.169
15122 dBµV31.62 mW-15 dBW1.2573.556
16123 dBµV39.81 mW-14 dBW1.4103.990
17124 dBµV50.11 mW-13 dBW1.5834.477
18125 dBµV63.09 mW-12 dBW1.7765.023
19126 dBµV79.43 mW-11 dBW1.9925.636
20127 dBµV100 mW-10 dBW2.2366.324
21128 dBµV125.8 mW-9 dBW2.5087.096
22129 dBµV158.5 mW-8 dBW2.8157.962
23130 dBµV199.5 mW-7 dBW3.1588.933
24131 dBµV251.2 mW-6 dBW3.54310.023
25132 dBµV316.2 mW-5 dBW3.97611.246
26133 dBµV398.1 mW-4 dBW4.46112.619
27134 dBµV501.2 mW-3 dBW5.00514.158
28135 dBµV630.9 mW-2 dBW5.61615.886
29136 dBµV794.3 mW-1 dBW6.30217.825
30137 dBµV1 W0 dBW7.07120.000
31138 dBµV1.25 W1 dBW7.93322.440
32139 dBµV1.58 W2 dBW8.90125.178
33140 dBµV1.99 W3 dBW9.98828.250
34141 dBµV2.51 W4 dBW11.20631.697
35142 dBµV3.16 W5 dBW12.57435.565
36143 dBµV3.98 W6 dBW14.10839.905
37144 dBµV5.01 W7 dBW15.83044.774
38145 dBµV6.31 W8 dBW17.76150.237
39146 dBµV7.94 W9 dBW19.92856.367
40147 dBµV10 W10 dBW22.36063.245
41148 dBµV12.58 W11 dBW25.08970.962
42149 dBµV15.84 W12 dBW28.15079.621
43150 dBµV19.95 W13 dBW31.58589.336
44151 dBµV25.12 W14 dBW35.439100.23
45152 dBµV31.62 W15 dBW39.763112.46
46153 dBµV39.81 W16 dBW44.615126.19
47154 dBµV50.12 W17 dBW50.059141.58
48155 dBµV63.09 W18 dBW56.167158.86
49156 dBµV79.43 W19 dBW63.020178.25
50157 dBµV100 W20 dBW70.710200.00
51158 dBµV125.9 W21 dBW79.338224.40
52159 dBµV158.5 W22 dBW89.019251.78
53160 dBµV199.5 W23 dBW99.881282.50
54161 dBµV251.2 W24 dBW112.06316.97
55162 dBµV316.2 W25 dBW125.74355.65
56163 dBµV398.1 W26 dBW141.08399.05
57164 dBµV501.2 W27 dBW158.30447.74
58165 dBµV630.9 W28 dBW177.61502.37
59166 dBµV794.3 W29 dBW199.28563.67
60167 dBµV1000 W30 dBW223.60632.45
61168 dBµV1259 W31 dBW250.89709.62
62169 dBµV1585 W32 dBW281.50796.21
63170 dBµV1995 W33 dBW315.85893.36
64171 dBµV2512 W34 dBW354.391002.37
65172 dBµV3162 W35 dBW397.631124.68
66173 dBµV3981 W36 dBW446.151261.91
67174 dBµV5012 W37 dBW500.591415.89
68175 dBµV6309 W38 dBW561.671588.65
69176 dBµV7943 W39 dBW630.201782.50
70177 dBµV10000 W40 dBW707.102000.00