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Content preview: >The tank coil reads about 80uH, can I just pad it >down
with more "C" to get to 73kHz or would that mess up the >L/C ratio and thus
lower the loaded "Q" ? Losses will go up four times due to doubling the current
through the coil by circulating currents. So it will be a matter of heat
dissipation. I know an OM who chose this quick and dirty method to extend
a Drake L4B to 160m. It worked but he had to cool the tank coil by a fan.
[...]
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Subject: LF: RE: Decca Experts - Converting Red to Purple ?
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>The tank coil reads about 80uH, can I just pad it=20
>down with more "C" to get to 73kHz or would that mess up the=20
>L/C ratio and thus lower the loaded "Q" ?
Losses will go up four times due to doubling the current through the =
coil
by circulating currents.
So it will be a matter of heat dissipation.
I know an OM who chose this quick and dirty method to extend a Drake L4B =
to
160m.
It worked but he had to cool the tank coil by a fan.
73
Clemens
DL4RAJ=20
>-----Original Message-----
>From: owner-rsgb_lf_group@blacksheep.org=20
>[mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of Warren Ziegler
>Sent: Sunday, August 04, 2013 2:28 AM
>To: rsgb_lf_group
>Subject: LF: Decca Experts - Converting Red to Purple ?
>
>Hello to all of the Decca Navigator experts out there...
>
> I have an unconverted Decca 5501 transmitter which is=20
>marked "Red" - I believe that is 112kHz - would like to run it=20
>on 73kHz. The tank coil reads about 80uH, can I just pad it=20
>down with more "C" to get to 73kHz or would that mess up the=20
>L/C ratio and thus lower the loaded "Q" ?
>
> Another question - anyone have a spare "Purple" Decca on=20
>71kHz that they would consider parting with?
>
>
>
>--=20
>73 Warren K2ORS
> WD2XGJ=20
> WD2XSH/23
> WE2XEB/2
> WE2XGR/1
> WG2XRS/1
>
>
> =20
>E-Mail ist virenfrei.
>Von AVG =FCberpr=FCft - www.avg.de
>Version: 2013.0.3392 / Virendatenbank: 3209/6548 -=20
>Ausgabedatum: 03.08.2013=20
>
>