no, not placing next to it, it would need to be physically connected. for example tie commons of both devices together, then use another wire and small cap as a "probe". one side of the probe can be attached to low impedance of the healthy radio (maybe right before detector). this way healthy tradio will not be loaded much by the "probe" and whatever else probe connects to. actually you may need to attenuate it too (RF output from healthy radio to cap, potentiometer, and another cap to a piece of wire acting as touch probe).
you are right, that was the typo, should be pin24 (AM input).
also the other it can be 19 too (in general input of IF stage is more sensitive to injected signal).
at any rate, if you construct little test probe as described, you are free to probe anywhere on the test subject without fear, there is no risk of damaging anything (actually i should take this back, while any damage is unlikely, i have no experience with this particular IC so theoretically, risk is always there). can you post circuit of your transmitter? if you used something that relies on spark gap then yes, damage is possible. if you did some small battery operated circuit, that would be very unlikely even if you made sort of connections as mentioned here as test probe.
it need to be point before the tuned LC circuit or there will be no way to tell the difference while trying to make any adjustment. general idea is to work backwards and setup one stage at a time, then move to previous one.
note that AGC will work against you, as you tune it better, signal is stronger and AGC will try to compensate by reducing gain. this is meant to preserve signal shape or too strong stations would be amplified too much (clipping destroys the envelope information).
good luck
Last edited by panic mode; Yesterday at 07:36 PM.
jeremy renner justin timberlake engaged bluefin tuna jonestown john dillinger atlanta hawks carlos zambrano
No comments:
Post a Comment
Note: Only a member of this blog may post a comment.