[R-390] R-390/URR Z-503

[Tisha Hayes]

Ref: Rewinding Tables;

It would be great to find rewinding tables for the inductors on both the
'600 and '390/A's.

Yesterday I found a seller (ePay) who is selling bunches of variable
inductors for $1.99 for sets of 5. They have six or seven different sets
(around 30 different inductor cans). With some detail on rewinding the
cores. the lowest value listed is 1.7 uH but I can see how to make that a
bit less to pull it into the range of Z-503. Of course the can does not
match but the guts can be pulled out. As was mentioned earlier for a higher
Q you would want more L than C. Might be interesting to run an existing
Z-503 through a sweep generator to see what the Q/ shape factor is at 455
KHz.
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Ms. Tisha Hayes/ AA4HA
-
Optimist: *The glass is half full.*
Pessimist: *The glass is half empty.*
Engineer: *The glass is not sized correctly AND we need a backup system.*