Just as a base-line sort of check,
Hooked up the original Pixie, 7.122 MHz crystal, earbuds, 50 Ohm load,
O'scope across earbuds, Butternut and long wire antennas.
LM-317 adjustable bench supply, Alinco adjustable switcher,? 12.2
Vdc battery (3-cell Ii-ion).? Both adjustables have about 10mV no
load ripple/noise. No noticeable 60/120 ac.
I hear a low level ac hum from both supplies and the battery with no
antenna connected.? It may be from the LM-386 audio amp.? Just
touching the case on the chip makes a big difference.
With Butternut connected, significant increase in noise and heard
contesters in the background.
Adjusting voltage with either supply, there was a definite null in noise
between 11 and 12 V.
The longwire, actually FS meter antenna, no radial, very intense noise
level.? No help connecting to rig grounds.
Sprite should be here later this week.? Anything else that would be
helpful, informative...??
Chuck, W5USJ (ex K2OFN)
ARCI 5422, SKCC 19956
EM22cv, Rains Co., Texas
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Chuck, W5USJ
