gumush 0 Posted July 30, 2010 Report Share Posted July 30, 2010 I bought video tx (1.3ghz) 800mw and another one 1500mw. Is there any way to measure poweroutput is real ? Quote Link to post Share on other sites
Terry 5 Posted July 30, 2010 Report Share Posted July 30, 2010 As a very rough guide measure the power going in and think maybe half is going to be your output power. There are lots of ways to measure RF, if you google it will give you many options. Why do you need to know? Terry Quote Link to post Share on other sites
gumush 0 Posted July 30, 2010 Author Report Share Posted July 30, 2010 I'm curios about quality of units. Quote Link to post Share on other sites
Kilrah 2 Posted July 30, 2010 Report Share Posted July 30, 2010 (edited) If you want a real measurement that is worth something (i.e. gives you info both about power and frequency accuracy), you'll have to find someone with access to a spectrum analyzer (which is a very expensive piece of equipment). The output power vs input power doesn't say anything, from my experience output power can be anywhere between 1/2 to 1/5 of input power depending on design, and especially a TX that is defective or sends spurious everywhere (=bad quality) will still use the same input power. Edited July 30, 2010 by Kilrah Quote Link to post Share on other sites
dalbert02 0 Posted August 3, 2010 Report Share Posted August 3, 2010 I bought video tx (1.3ghz) 800mw and another one 1500mw. Is there any way to measure poweroutput is real ? The cheapest most accurate way would be to find a 'ham' in your area with a bird or coaxial dynamics wattmeter and offer to buy him a 'slug' for the frequency and power you are using. Give him the slug for payment for borrowing his meter. If you are more diy you can rectify the rf feed into a 50 ohm dummy load and measure the voltage to calculate watts. -dave Quote Link to post Share on other sites
kist2001 0 Posted August 6, 2010 Report Share Posted August 6, 2010 (edited) Sorry double post Edited August 7, 2010 by kist2001 Quote Link to post Share on other sites
kist2001 0 Posted August 6, 2010 Report Share Posted August 6, 2010 I have a bird wattmeter which I use to test transmitters output. Unfortunately I only use the 900 Mhz band and have no slug for 1.3. As the previous poster said if you would be willing to buy the slug I could test all your units. Yet a spectrum analyzer would be better as it would tell you RF energy radiated at your specific wanted frequency versus a summation of all power out. My cheap USB spectrum analyzer only works in the 900 Mhz band but has taught me volumes about transmitters I have purchased. The bird wattmeter lets me match antennas to transmitters and see how transmitters are performing. -Ken Quote Link to post Share on other sites
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