|Subject:||Re: [Discuss-gnuradio] Max Output Power from the LFTX|
|Date:||Tue, 06 Jan 2015 20:17:05 +0100|
|User-agent:||Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.3.0|
>Is the input impedance of your scope 1Mohm or 50 ohms?
Yes, it is 1 Mohm,
Well, in that case, your power consideration is not really correct; the LFTX is designed for 50 Ohm load impedance; so, for meaningful measurements, you'd have to measure the voltage over 50 Ohm.
I'm not really sure how much current the opamp on the LFTX is designed to source, but I think adding a 50 Ohm load would reduce the current through the negative feedback resistors R4/R7 (and in turn reduce the bias over R33-R3/R35-R6) , which might change your measurements significantly.
On 01/06/2015 08:09 PM, khalid.el-darymli wrote:
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