Re: Question: Why do you call "AGC" a simple automatic antenna "attenuator" in this forum? #ubitx #ubitxv6


Curt
 

Nice discussion all around. The gain in the ubitx is nicely arranged.

Usually the RF attenuator function in the most sophisticated HF receivers is a maual conrol. Since the ubitx does not use a presmp, I don't require an RF attenuation control.

A radio operator csn adjust also the audio gain. But a little AGC can help here.

The LED/LDR circuit appears to act slightly logarithmic which is useful. It works pleasantly with the ubitx gain distribution. 

A lossy attenuator network at the front of the ubitx would be a bad thing at high part of HF. An experimentor should evaluate sensitivity on 28 Mhz with and without it. Meanehile, leave it out if you don't need it. 

73 curt

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