Date: Tue, 18 Dec 2012 09:29:21 +0200
Message-ID: <20121218092921.Horde.h2yZX_rSz0VQ0BtRPVIC2uA@posti.anvianet.fi>
From: phl@netikka.fi
To: rsgb_lf_group@blacksheep.org
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Subject: Re: LF: FT-241A xtals?
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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 <dtsifakis@gmail.com>:

> 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