Electronics > RF, Microwave, Ham Radio

High isolation LNA for the HF band direct conversion receiver

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Gerhard_dk4xp:
?? I do not understand the question.

In the mean time I have found a pic of the preselector.

szszjdb:
Hi, dk4xp,

Many Thanks!

I just want to make sure the linear output level of LNA is within the margin of the following quadrature detector and the ADC.  If the P1dB of the LNA is too low , the 2nd and 3rd distortion component might degrade the IIP3 performance. If it is too high, more current drain. 

Best Regards & 73,
James

A.Z.:
I can't still understand if you are on some kind of assigment or whatever, not willing to give offence, but sincerely... at times you seem to be a skilled EE and the second later you look like a total newbie, now, while there's nothing wrong with that (ok almost), it seems like you start by reading a question from someone else and then get down to being cluessless, again not willing to offend, but sincerely, to me, it doesn't look like the kind of "walk the talk" kind of behaviour, then, by the way, I'm just another newbie here, so I may be totally wrong

szszjdb:
Hi,  A.Z.,
Many thanks for your help!

Yes I am not familiar with the LNA and willing to have more advice on the design.  Sorry to make you confuse.

From the testing these day, I found many cross modulation and intermodulation distortion when I switch on the LNA in the 10m band in the afternoon. It seems a lot of modification needed, the BPF and the LNA.

Best Regards & 73,
James

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