Author Topic: DSA815-TG protecting input (Signal Strength)  (Read 2372 times)

solitaire

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DSA815-TG protecting input (Signal Strength)
« on: January 28, 2013, 09:55:32 AM »
Is there an easy method or another method of checking the signal strength before connecting it up to a spectrum analyser, to avoid any damage with out going to the expense of buying a power meter ? any help would be appreciated..

fpliuzzi

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Re: DSA815-TG protecting input (Signal Strength)
« Reply #1 on: April 18, 2013, 11:37:00 AM »
Hello,
I just stumbled across your post and I thought that the following URL may be of some assistance (if you haven't already purchased an RF meter).

www.qsl.net/n9zia/wireless/appendixF.html#8

There you'll find schematics for building two "LED RF Signal Meters". The first one has a bandwidth of 100MHz - 2.5GHz (uses an AD8313) and the second one is "DC" - 500MHz (uses an AD8307). These meters have indicator LEDs that show RF signal strength levels from -70dBm to +10dBm.

With a 20dB pad added to the signal meter's input I'll be able to tell when the RF level reaches +30dBm, which is the maximum input level for my RF Explorer-3G Combo handheld RF spectrum analyzer (its second input can handle +5dBm max).

I built the 500MHz LED RF signal meter years ago and it has served me well. Now that I've purchased the RF Explorer I'll be building the 100MHz - 2.5GHz version of the meter soon. I plan to use these simple RF meters to pre-test some RF signals before I subject my RF Explorer to a potentially damaging level of signal. The LED RF signal meters use a pair of diodes for some input protection.

Regards,
Frank
« Last Edit: April 18, 2013, 12:55:15 PM by fpliuzzi »