Is it possible to find SWR using just a multimeter? The transmitter is only 500 milliwatts on 446 mHz

[Twiglet]

The transmitter is only 500 milliwatts and operates on 446 mHz.

 

[unclejed613]

no, a multimeter doesn't measure voltage or current past a few kHz. you need a reflectometer (also known more commonly as an SWR meter). plus, at 446MHz, you will need one for the UHF part of the spectrum, a typical HF SWR meter that you would find at a Radio Shack store is not going to work because the directional coupler section is too long, and the diodes have too much junction capacitance.

 

[sagor1]

If you have a proper 446Mhz "detector" or some sort, the voltages can then be read with a volmeter. That is what SWR meters/devices do, they use a detector (forward and reflected each with a diode detector/rectifier) and measure the resultant voltages and display it on the meter.
A meter itself cannot read 446Mhz, it can only read voltages which you have to produce via that "detector".

 

[unclejed613]

you can find instructions and a part list for a suitable reflectometer here: https://vk5ajl.com/projects/swrmeter.php

 

[Twiglet]

Thank you unclejed. Thank you sagor1. The link is great,
So is the suggestion of a receiver of some kind.
I am using my cherished germanium diode as a receiver at this moment. The diode is mounted across a piece of 5 Amp terminal block to provide connection to a £2:50 digital multimeter which I bought from Maplin years ago. A one meter length of bell wire acts as the antenna .
With this, I have been able to get comparative readings which have helped me repair a broken stub antenna.
I do have a proper receiver but do not know how to wire a signal strength meter into it without causing damage to the unit.
Thanks again