Field strength meter
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This document describes how to build a simple field strength meter to test if an antenna or handheld radio is working properly. It recommends using meters from old tape decks, which have good sensitivity. The document also provides instructions on how to use the field strength meter to take readings at monitoring points away from the antenna to test the antenna's performance and how adjustments affect the signal strength.
Field strength meter
- 1. FIELD STRENGTH METER 4S6GGS This simple field strength meter is ideal for testing if your antenna or handheld radio is working. The sensitivity depends on the sensitivity of the meter you use, so try a few www.4s5gs.gayan@gmail.com different meters if you have a few available. I have found that level meters out of old tape decks have good sensitivity. If you are going to buy a meter, get a 1mA (milli-amp) meter.
- 2. FIELD STRENGTH METER This simple field strength meter is ideal for testing if your antenna or handheld radio is working. The sensitivity depends on the sensitivity of the meter you use, so try a few different meters if you have a few available. I have found that level meters out of old tape decks have good sensitivity. If you are going to buy a meter, get a 1mA (milli-amp) meter. 4S6GGS Gayan E mail. 4s5gs.gayan@gmail.com
- 3. FIELD STRENGTH METER 4S6GGS Gayan E mail. 4s5gs.gayan@gmail.com
- 4. FIELD STRENGTH METER To use The length of antenna is not a critical at all. Length = 0.95 x 300/(4 x freq) <= (freq = Mhz) 1. Turn on transmitter and meter; adjust R2 for peak reading. Turn off transmitter. Turn on transmitter (with no audio modulation) and go to your monitor point(s) and take readings. Your monitor point(s) should be many meters/yards away from your antenna, After taking a set of readings, you can experiment with your antenna or transmitter system, then take another set of readings and determine whether your signal strength was increased or diminished. Keep your readings in your book. Make note of whether it’s been dry or rainy in recent days; moist soil might give slightly better propagation. 2. Your meter can measure the low levels of radio frequency (RF) generated by a radio transmitter. You can use these measurements to map the transmitting direction and coverage pattern of your antenna, or to compare your radio and antenna's efficiency before and after an adjustment. You do not need to connect the meter to the antenna or the radio to measure field strength. It takes two people to measure field strength. For an accurate measurement, you will need to map the site around your antenna. Then, while someone presses the radios transmit key, you will need to walk around the site around your antenna with the meter, marking the readings you see. Hints: In addition to the meter, we recommend you use the following items to help you measure field strength: Several photocopies of the template 36 objects such as rocks or weighted pieces of paper 25 feet of rope or strong cord Calculator Pencil Compass Make sure there is at least 25 feet of open space in all directions around your antenna. 4S6GGS Gayan E mail. 4s5gs.gayan@gmail.com
- 5. FIELD STRENGTH METER 4S6GGS Gayan E mail. 4s5gs.gayan@gmail.com
- 6. FIELD STRENGTH METER 4S6GGS Gayan E mail. 4s5gs.gayan@gmail.com
- 7. FIELD STRENGTH METER 4S6GGS Gayan E mail. 4s5gs.gayan@gmail.com
- 8. FIELD STRENGTH METER 4S6GGS Gayan E mail. 4s5gs.gayan@gmail.com