I have built amplifiers with out the "choke" or resistor on the output of
the tank. After a key-down, the load cap will sit there
and snap a few times. Discharging the tank circuit. However, the discharge
is not 100 %. There is still voltage left in the tank.
I know this, because I have felt it with my finger........ooowwwwww!
73 to all
Jim W7RY
-----Original Message-----
From: measures <measures@vcnet.com>
To: AMPS <amps@contesting.com>
To: <amps@contesting.com>
Date: Thursday, November 25, 1999 11:54 PM
Subject: Re: [AMPS] 220K resistor vs choke and sound card tone generator
program...
>
>>
>>Hello again...
>>
>>:I have not been paying much attention to this discussion but I did have
>>this thought :about generating and measurement of two tone using a
>>computer with a sound card.
>>
>>In one of my more recent audio mags (glass audio or audio amateur),
>>there's a blurb about a sound card tone generator program which can be
>>down loaded from the net. I'll dig around for the information again...
>>
>>Re: SB-1000 fix
>>I saw the post which mentions replacement of the "output choke" in the
>>tank circuit with a 220K resistor. I'm curious about the reason why and
>>the benefit.
>>
>? It's a DC bleeder path for removing static charge from the antenna.
>The nice thing about a resistor in lieu of a choke is that it is not a
>tuned circuit on some frequency. In the Ugly Amplifier, a 50uH solenoid
>choke provides a DC bleeder path to ground. 50uH was used because it is
>the highest inductance choke that has no resonances inside the HF range.
>// The explanation that such a choke prevents HV from appearing on the
>antenna (in the event that a DC blocker capacitor fails) is yet another
>"old wives' tale" because typical Load capacitors arc at well under
>2000v
>
>cheers
>
>- Rich..., 805.386.3734, www.vcnet.com/measures.
>
>
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>
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