10-01-2012, 07:40 PM
Hi Steve,
I am able to peak the 1st IF. I'm having trouble with the 2nd Detector and 2nd IF. I'm using an Eico 324 which has been calibrated using a radio. I then checked a few other radio stations to see how well it tracked across the frequency band range and noticed some error.
Since I don't have a frequency counter yet, I took some data points of the frequency error across the Standard Broadcast band and plotted it on an excel spread sheet to give me a guestimate of offset for 460kHz, (about 7kHz offset). I set the 324 accordingly and did an alignment.
I would think even if the reference frequency was off a bit there would be enough adjustment in the trim caps to peak the output voltage.
John
I am able to peak the 1st IF. I'm having trouble with the 2nd Detector and 2nd IF. I'm using an Eico 324 which has been calibrated using a radio. I then checked a few other radio stations to see how well it tracked across the frequency band range and noticed some error.
Since I don't have a frequency counter yet, I took some data points of the frequency error across the Standard Broadcast band and plotted it on an excel spread sheet to give me a guestimate of offset for 460kHz, (about 7kHz offset). I set the 324 accordingly and did an alignment.
I would think even if the reference frequency was off a bit there would be enough adjustment in the trim caps to peak the output voltage.
John
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