Everyone involved with radio transmitters needs some instruments to assess basic antenna functionality. Among these instruments, the best-known and most-used one is the Standing Wave Ratio meter. Some radio amateurs develop a cult for these little gadgets, having them in line all the time and watching the needles bounce while they chat.
Wideband SWR Meter – [Link]
A pair of AD8307 RSSI (Received Signal Strength Indicator) chips are used to produce DC voltages that are proportional to the logarithm of the Forward and Reflected power levels. These DC voltages can then be subtracted in an Op Amp to produce a voltage proportional to SWR which is essentially independent of power level.
SWR Meter – [Link]
LCD SWR Meter presented here meet many simple task using a micro controller, especially, dear to all of us, a PIC!!. This time its PIC16F88. The very basic purpose to make this project is to encourage radio amateurs to build their own High Quality LCD SWR Meter at low price, instead of buying expensive ready made units. [via]
SWR Meter with Pic16F88 – [Link]
LCD SWR Meter presented here meet many simple task using a PIC16F877A micro controller. The very basic purpose to make this project is to encourage radio amateurs to build their own SWR Meter at very low price instead of buying ready made at high prices. [via]
HF 100W LCD PIC16F877A SWR Meter - [Link]
This is a very cool project for all hobbyists.It is a PIC16C71 based 4-digit LED frequency-counter & Volt-meter. Some hard to find parts used in the previous version, which are out of production for some time, has been omitted. A rather early PIC16C71 has also been replaced by 28-pin device PIC16F876. The later is capable of driving 4 digit LED display in multiplexed mode while measuring frequency, power supply voltage as well as handle two analog inputs to display SWR/PWR signal strength in a bargraph manner. There is no need for external LED display driver chip as well as external data EEPROM since it is already implemented in PIC16F876.
50 MHz frequency counter, voltage meter & SWR/PWR indicator - [Link]