Hello Dimitrios, LF
Yes, the same thought has been on my mind for a long time now. The
problem is that fundamental X-tals for this frequency band are nearly
unobtainable. I have even tried to custom order some new ones for me
and a couple of friends but never succeeded - the quantities would
need to be much larger for this type of crystals. (They use a
different kind of cut as compared to crystals for say 3500kHz which
can still be ordered custom fairly easily)
Hopefully people with a stash of suitable vintage X-tals will wake up
when the new band opens for real and put some up for sale if they
don't want to use them themselves.
I'd say go for it - I have built a couple of "MO-PA" transmitters for
80/160m, they are really pleasant and rewarding projects with a
distinct sound of their own. This is especially true if you also key
the oscillator.
BR and good luck with the project
Paul-Henrik, OH1LSQ
Quoting Dimitrios Tsifakis <[email protected]>:
Hello lf group,
has anyone made or thought of making a 472 kc transmitter using
vintage FT-241A xtals? I have three or four of these with fundamental
frequencies in the 474 kc to 479 kc range, so I was thinking of making
a traditional 6AG7/807 transmitter, just for the fun of it.
Can't think of a better transmitter for hand keyed CW for that
historic part of the spectrum!
73, Dimitris VK1SV
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