On Thu, Jul 8, 2021 at 09:43 AM, John Cunliffe W7ZQ wrote:
A high pass filter before the optional AGC is recommended. I have? great success with the filter published in older ARRL handbooks since it permits 160m to fully function. I recommend installing it before the AGC since I have found distortions from strong AM station otherwise. (I have a full power AM station less than 2 miles away) Without the filter, broadcast stations overdrive the wide open input of the radio.?
John,
Would you please help me understand why the AGC should be after the BCI?? At least for the kit-projects AGC and BCI it seems to me that it would not really matter.? The AGC takes its level from the audio and then attenuates the RF coming from the antenna.? The fact that the broadcast signal is removed after the AGC should not really matter.? The attenuation is done based on the audio part of the signal that does get through both.
Putting the BCI after the AGC is the way that kit-projects designed the two add ons.
73
Evan
AC9TU
