SB401 QUESTION, 21 mhz trap....

[Guy G. Giacopuzzi DDS]

If my memory serves me correctly, the trap was included with the SB-303,
and installed into the 401' as a "mod" during the construction
phase, necessary for tranceive operation.  Evidentally, the 401' (or an
oscillator in the 303'????) had a spur that needed attenuation...But
you'll have to look in a 303' manual to confirm this...As far as I know,
there's no such mod installed when tranceiving with a 300 or 301'...

ggg


Dan Pividal N4VET wrote:
>
> I have a HeathKit 401 transmitter that I am restoring.
> On the MIXER-BANDPASS BOARD I should have a 21MHz. trap.
> The trap and a related capacitor is missing but the transmitter seems to be
> working fine.
> Does anyone know what the trap was for and why would the previous owner, who
> is now a "Silent Key", would have removed it.
> Also, if I need to put the trap back in where would I begin to look for it? My
> manual says it was pre-set at the factory and seems to be a Heath part.
> Looks like it's going to be hard to find.
> Thanks,
> Dan N4VET
> E-MAIL ADDRESS Otakebi at aol.com
>
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