Strength Meter
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VINTAGE ARCHER STANDING WAVE BRIDGE AND FIELD STRENGTH INDICATOR $9.99 |
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Royce CB SWR Meter,Field Strength IndicatorModel 2-100 $5.99 |
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ASTATIC SWR / RF / FIELD STRENGTH TEST POWER METER 10W 100W (NEW in box) $20.00 |
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Lafayette SWR & Field Strength Meter Model 99-2537 $10.99 |
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EICO FIELD STRENGTH METER NEW IN BOX RF MONITOR 26 MHz TO 230 MHz CB RADIO $9.99 |
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Astatic PDC2 SWR/RF/Field Strength Meter $24.90 |
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Mura Model CBM-10 SWR CB Field Strength Meter citizen band short wave radio rare $16.99 |
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OLSON SWR & FIELD STRENGTH METER MODEL CB067 cb radio $9.99 |
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MINT IN BOX Royce SWR / PWR / Field Strength Meter $24.95 |
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Recoton Citizens Band SWR And Feild Strength Meter Model CB170C $4.99 |
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Cobra classic design CB radio- RF/signal strength meter $107.79 |
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Micronta Field Strength and SWR Tester # 21-525A $30.00 |
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EICO 715 TRANS / MATCH Power, SWR, Modulation, Field Strength Meter with RF Load $14.99 |
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NOS ~Sears~SWR/Field Strength Meter For CB 2-Way Radio….model 526.35760600 $12.99 |
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Micronta Field Strength & SWR Tester Meter Cat # 21-525B $9.99 |
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MIdland 23-138 SWR Power Field Strength and Modulation Meter Vintage $24.99 |
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COBRA 40 CH. CB RADIO PACKAGE {CB,,SWR/FIELD STRENGTH METER,,,25 FEET COAX $20.00 |
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Kris SWR & Field Strength Meter Model 823-126 Amateur Radio Transmitter $29.95 |
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Cobra classic design CB radio- RF/signal strength meter $107.79 |
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Radio Shack Field Strength SWR Meter Cb/ham Radio $9.99 |
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OPEK SWR-3 SWR & FIELD STRENGTH METER 1.7-150 MHz $27.95 |
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FIELD STRENGTH METER–C.B. MODEL 61–PENN ELECTRONICS $3.99 |
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Vintage Micronta Field Strength and SWR Tester 1990? Radio Shack in original box $19.99 |
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CITIZENS BAND CB SWR FIELD STRENGTH METER CB-170-2 W/ANTENNA BOX COMPLETE WORKS $27.99 |
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2 NOS LIGHTED RF SIGNAL STRENGTH METERS,CB HAM RADIO PARTS,AMPLIFIER,RECEIVER $9.00 |
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Cobra classic design CB radio- RF/signal strength meter $107.79 |
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Citizens Band Recoton SWR/Field Strength Meter – NO RESERVE!!!! $13.50 |
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LaFayette 99-25835 SWR METER & FIELD STRENGTH INDICATOR ANTENNA+MANUAL+PAPERS $24.99 |
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VINTAGE LAFAYETTE SWR & FIELD STRENGTH METER #99-25835 IN BOX $22.99 |
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Bird 43 Relative Field Strength Element 4030 CDI 7610 $159.00 |
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Vanco SWR-1 Field Strength and SWR Meter $9.99 |
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MIDLAND FIELD STRENGTH SWR METER MODEL 23-126 ORIG. BOX,TESTED,WORKS GREAT! $19.95 |
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VINTAGE LAFAYETTE S.W.R. METER & FIELD STRENGTH INDICATOR 99-25835 $17.99 |
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KENWOOD DM-81 DIP METER L/C ANALYZER, ANTENNA ANALYZER, SIGNAL STRENGTH ANALYZER $34.00 |
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CITIZENS BAND SWR AND FIELD STRENGTH METER $19.96 |
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Midland 13-882B CB Radio With Micronta SWR Field Strength Tester Meter Vintage $19.99 |
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Micronta Field Strength and SWR Tester Radio Shack Cat. No. 21-525B $10.00 |
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Recoton CB Citizens Band SWR and Field Strength Meter model CB177C. . Works $28.99 |
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Micronta Field Strength and SWR Tester model # 21-525B $7.95 |
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Radio Shack Field Strength SWR Tester $19.99 |
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Vintage Lafayette No. 99-25835 SWR Meter & Field Strength Meter w/Original Box $35.00 |
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Workman SWR-3P RF Field Strength CB Antenna Meter NEW $22.95 |
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VINTAGE LAFAYETTE SWR & FIELD STRENGTH METER $24.99 |
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NOS Citizens Band CB SWR & Field Strength Meter $32.50 |
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OLD VINTAGE JAPAN PHILMORE FIELD STRENGTH METER ANTENNA FS-45 UNTESTED FREE SHIP $45.00 |
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OLD VINTAGE MIDLAND INTERNATIONAL FIELD STRENGTH METER ANTENNA 23-126 UNTESTED $45.00 |
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Vintage Micronta 21-525B SWR Signal Strength RF Meter HAM Radio $35.00 |
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RPSWR-3C Swr Meter-10w-100w-Set & Field Strength $36.40 |
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ASTATIC SWR / RF / FIELD STRENGTH TEST POWER METER 10W 100W CB ANTENNA RADIO NEW $19.99 |
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VINTAGE MICRONTA # 21-525A FIELD STRENGTH AND SWR TESTER-NEW OLD STOCK $19.99 |
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Siltronics FS-9DX Field Strength SWR Meter $44.99 |
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** Olson SWR/ Field Strength Meter CB-067 $24.99 |
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MIDLAND 23-126 SWR/POWER/FIELD STRENGTH METER – Minty $24.00 |
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New Lodestar FS45 SWR Bridge and Field Strength Meter $45.35 |
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Para Dynamics PDC2 SWR/RF/Field Strength Testmeter $15.00 |
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FIELD STRENGTH INDICATOR & STANDING WAVE BRIDGE P5453 PACE DIVISION, PATHCOM $20.99 |
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Lafayette SWR & Field Strength Meter NO. 99-25835 $20.00 |
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Radio Shack Field Strength SWR Meter Tester 21-523 FREE US Shipping $29.99 |
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Pair Lot of 2 Vintage HAM Radio Field Strength Meters Vanco SWR-3, Olson CB-067 $40.00 |
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SAS Micronta Field Strength & Standing Wave Ratio Meter w/ Owners Manual $15.99 |
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MIDLAND FIELD STRENGTH INDICATOR & STANDING WAVE BRIDGE MODEL 23-126 $9.99 |
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Radio Shack Field Strength / SWR Tester $8.97 |
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OLSON FIELD STRENGTH SWR METER MODEL CB-067 $25.00 |
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MFJ 812B – VHF SWR/Wattmeter plus Field Strength-New $39.85 |
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Micronta Field Strength And SWR Tester by Radio Shack new in box $29.47 |
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VINTAGE BLONDER TONGUE FSM-2 MODEL 4127 STRENGTH METER $254.99 |
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HeathKit Manual: Relative Field Strength Meter HD-1426 copyright 1977 $19.95 |
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Cobra classic design CB radio- RF/signal strength meter $107.79 |
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Citizens Band CB SWR & Field Strength Meter CB-170-2 $15.95 |
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Royce Field Strength & SWR Meter $9.99 |
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Cobra CB RADIO 2 Way Signal STRENGTH Meter Switchable NOISE BLANKER Microphone $112.61 |
The Resistivity Meter, Vital Equipment In A Number Of Industries
The term resistivity refers to the electrical resistance of a material. Put simply this is the amount of resistance a material can put up against an electric current, most measurements are made with a resistance meter. A material that is regarded as being highly resistant impedes the flow of electron greatly; plastic and rubber are both examples of materials with high resistance. On the other hand a low resistant material will allow the flow of electrons freely; examples would be some metals and liquids such as water.
All materials have a specific resistance related to them, however a number of general rules mean that it is not always essential to utilise a resistivity meter. Metals and salt water are particularly conducive to allowing the free flowing of electrons; glass, plastic and rubber are the opposite. Due to the low resistance of metals, these are used for electrical wiring while wires are coated in plastic or rubber to avoid electric shocks and short circuits. In the electrical product industry the resistivity meter is used frequently to test the resistance of wires and electrical components.
Resistivity is not however the same as resistance; it is an equation that takes into account three separate factors. These three factors are resistance, area and length. The resistance is measured in Ohms and in most cases can be found using a table of resistance that contains information on a number of different materials. Area is the area of the wire or piece of material and shows how much space the electrons have to flow. Finally the length gives information on how far the electrons must travel. In terms of mathematics by multiplying the resistance and area and then dividing this number by the length will give the resistivity. Thankfully the resistivity meter does this without the need for a pen and paper.
It is not only the electrical manufacturing industry however that extensively measures resistivity. Surprisingly the mining industry also uses the meter regularly on rock formations. This is because rock formations that have large amounts of metal present in them will conduct the electricity. Hence by measuring resistivity, miners can find deposits more effectively. Subsequently the process of finding metals in the earth is made that less laborious and safer. The processes involve testing on the ground using handheld meter varieties as well a deep drilling that requires a far larger and more powerful resistivity meter.
The two methods of prospecting using electrical resistance are also subdivided into two categories, passive and active. Active prospecting is the process of adding a large electrical charge to the ground and then measuring the strength of the electrical field at a variety of points using electrodes. Passive is different in the way that it measures naturally occurring electrical fields as a result of chemical reactions taking place underground.
It is thanks to the resistivity meter that both of these techniques are deemed a valid way of prospecting for metal deposits in the ground. Apart from the mining industry this technology has helped in electrical manufacturing to build hardier, more effectively designed components and devices. Without the resistivity meter the mining process would be far more dangerous and difficult, and our electrical devices would not be as reliable. It may not be the most exciting of meters, but the impact it has had on a number of disparate industries should not be underestimated.
About the Author
Science and technology expert Thomas Pretty looks at resistivity meter applications in mining and electrical manufacturing.
Pole vault leads Coyotesâ effort at state
By Mark Jones Sports Editor The pole vault has been a strength of the Williston High School girls track and field team all season.
