Re: [TCML] Tuning vs Interference

["Phillip Slawinski" <pslawinski@xxxxxxxxx>]

Turns out my cable box wasn't dead.  I guess the firmware for the cable card
was just wiped somehow.  It fixed itself eventually.  I wonder if the
interference could be caused by currents induced in the coax?  Or is  it
more likely that this interference is being dumped into the mains?  I've
ordered a 20A RFI filter, hopefully this will help.

On Thu, Jun 19, 2008 at 10:48 PM, Phillip Slawinski <pslawinski@xxxxxxxxx>
wrote:

> My RF ground is 22ga wire run to a drain pipe on the side of the building.
> Probably not the lowest impedance ground available.  Unfortunately I can't
> really do any better than this.  I live on the third floor of an apartment
> building.
>
> It looks like I'm not going to be able to run the TC much longer in this
> apartment :(  Maybe I should build a VTTC
>
> On Thu, Jun 19, 2008 at 10:33 PM, Lau, Gary <Gary.Lau@xxxxxx> wrote:
>
>> If you're referring to radiated RF, I'll guess that interference decreases
>> if a coil is out of tune.  But I'm curious.  What do you use for an RF
>> ground?  The amount of (conducted) RF that is coupled into your mains wiring
>> is directly related to the quality of your RF ground, and this is what may
>> have done in your cable box.  Hearing what you used would be a valuable data
>> point for the rest of us.
>>
>> If I think about it, if a coil is out of tune, the primary energy has
>> trouble getting to the secondary side, so it stands to reason that the
>> oscillating primary will couple through the NST and into the power mains
>> more-so than if it could dump the energy quickly into the secondary.  That's
>> my shoot-from-the-hip analysis, anyway.
>>
>> Regards, Gary Lau
>> MA, USA
>>
>> > -----Original Message-----
>> > From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On
>> > Behalf Of Phillip Slawinski
>> > Sent: Thursday, June 19, 2008 10:37 PM
>> > To: tesla@xxxxxxxxxx
>> > Subject: [TCML] Tuning vs Interference
>> >
>> > Does interference go up or down when the coil is properly in tune?  I
>> bought
>> > a new transformer today (and picked up a freebie).  Anyways, the freebie
>> was
>> > a 15/30 so I'm running that in parallel with my other 15/30.  I have a
>> cap
>> > size that's pretty close to resonant cap size for my transformer.  The
>> caps
>> > are bottle caps so they're pretty terrible.  I hope my losses are all in
>> the
>> > caps, because I'm only getting 12" streamers with a breakout point.
>>  Getting
>> > back to the subject line here ... every time I run the coil the cable
>> box
>> > loses it's authorization.  This used to happen sometimes, but not
>> always.
>> > Now it happens every time.  Does this mean my coil is still out of tune,
>> or
>> > will it be causing massive amounts of interference even when it's in
>> tune?
>> >
>> > P.S.  It would seem that I've fried my cable box :(  It just keeps
>> flashing
>> > "card download"
>>
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>
>
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