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SWR BRIDGE hows it work????


i have an SMC relative power/swr bridge, with no instructions and i cant understand how to set it, or how it works. anyone else used one??
two meters on it, power and swr.

Last edited by 26fb010, 5/Sep/2009, 2:45 pm
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Re: SWR BRIDGE hows it work????


Is this one of those that requires you to set it & then check SWR ?
If so place the switch onto set or forward or what ever the thing says, rotate knob until needle is on set on the dial & then flick the switch to reflected power, or what ever the thing says.
Give me a cross needle meter anyday.
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Re: SWR BRIDGE hows it work????


there is no switch!! just a rotatable knob.
5/Sep/2009, 6:08 pm Link to this post Send Email to 26fb010   Send PM to 26fb010
 
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Re: SWR BRIDGE hows it work????


Is it a SMC T3-170L? I can find a few for sale, but no infomation about them.
5/Sep/2009, 7:14 pm Link to this post Send Email to crimso   Send PM to crimso
 
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Re: SWR BRIDGE hows it work????


yes thats it, but how do i work it?
it does HF and 2 metres, but no idea how it works!!
12/Sep/2009, 10:18 pm Link to this post Send Email to 26fb010   Send PM to 26fb010
 
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Re: SWR BRIDGE hows it work????


It should have a calibration impedance you set it to to give FSD then unplug and use it without adjusting anything. If you havent got one you can use a 1/4 of coax but its freq relative so will only calibrate at one freq. have you tried a 50 ohm dummy load?
193
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Re: SWR BRIDGE hows it work????


hi john, im not sure were talking about the same thing? there is a power meter on the left and an swr meter on the the right, in the middle is a control knob (variabe), thats it, no forward/reflected power or owt...
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Re: SWR BRIDGE hows it work????


If its got two meters then is it not just forward power on one and reflected on the other. If its relative then when you apply say 10w of rf you make the power meter read 10 and the SWR is then read off the other meter.
What happens when you apply rf and turn the knob? is there a CAL set point on any meter? plug in a dummy load and see what it shows with rf applied.
John
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Re: SWR BRIDGE hows it work????


Maybe you could take a Pic and post it here, then we might be able to help a bit more...

---
26-FB-173 - NumbNut / 26-TM-121 - DingBat / 26-CT-151 - Beelzebub

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Re: SWR BRIDGE hows it work????


With this type of meter you simply apply RF and turn the knob until the PWR meter reads full scale. The SWR can then be read off the other meter - simple and quick to operate.

The calibration position of the knob will vary with power (obviously) but also with frequency. This knob may have a graduated scale, and if so, you could apply a known power at a particular frequency, set the knob to display that power level, note the knob's position and you will then be able to get an idea of other power measurements at that same frequency.

Not very accurate, but can get you by.

---
Andy - 26 FB107
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