John C'man,
Using a spotter radio is kosher unless it is made from porcine product.
Rabbi Gil

John B,
Over the past few years I've built 4 smd digital dials for various
projects.  I had one around the shack and tried to hook it up to the 59, but
everyplace I checked, detuned the radio.  This was before I had the
schematic.  I tried buffering with the recommended capacitor, but it may
take a fet buffer.  This is about #35 on my to do list.

You don't need a digital frequency meter if you have an old boat anchor
frequency meter.  In aligning a couple of 59s, I didn't feel like rigging up
or calibrating the digital dial, so I connected a coupling ferrite loopstick
to the RF output of my ancient Lafayette T20, a tuber, the analog dial not
to be trusted, and hung a wire out of the R8B's 500 ohm antenna clip, tuned
the Drake to the frequencies of interest with the 500Hz filter enabled and
dialed the T20 until the tone was heard and went from there.  I probably
didn't need the tight filter, but why not?

73 Gil
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