Your 10m rig would have to be VERY frequency stable to pull off 10m to
10GHz.
My 144MHz to 10GHz stuff drifts significantly when moved from shade to
full sun during June.
Maybe not in January?! (GRIN)
--
Nate Duehr, WY0X
Sent from my iPhone
On Jan 23, 2009, at 23:16, kb7dqh@donobi.net wrote:
> Key word here is "commercial"... I have seen a filter design by
> N6CA that
> is narrow enough at 10 Ghz to allow for a 10 meter band IF... and he
> homebrewed a
> 10 Ghz transverter based on his filter design for that IF!
>
> Sooo.... Should be possible to build filters that would knock the LO
> down
> to a dull roar at closer frequencies... likely out of waveguide,
> or lots
> of pipecaps! Getting the shape factor to knock down or kill off the
> LO
> radiation
> on transmit is the key here... and, generally this isn't done
> because of the
> higher losses that may be present in such a "tight" filter design...
> requiring more gain somewhere... but then, microwave frequency
> MMIC's are
> getting cheap
> now, or at least cheaper than they were... so designs can be adjusted
> accordingly...
>
> Eric
> KB7DQH
>
>
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