[Amps] rf choke on output

[R at contesting.com]

On Mar 27, 2006, at 7:41 AM, Partain, Chuck wrote:

>
> I read some info about the rf choke on the output of the amps to work 
> in case the blocking cap fails.

If the load C is your typical 1500v air variable, and the DC blocker 
cap fails, the load C will act like a protective spark gap, and clamp 
the HV to c. +20v until the mains circuit breaker opens.  However, a 
RFC across the load-C does nothing on RX to bleed static charge off of 
the antenna.

> I see different values listed plus I read in these archives that one 
> can be made from #24 wire???

A high-value resistor that is rated for 1kV or so will safely bleed 
static charge off of the antenna during RX --  if is connected across 
the output RF connector. With this arrangement, the high-value R can 
also serve as the voltage-divider for the diode-detector relative RF 
out circuitry.   The covers-all-bases arrangement is one such bleeder 
resistor across the load C and another one across the RF out spigot.

> can someone shed a little more light on this for me as I do not have 
> one installed...YET!
>
> I see some call for a z-50???
>
> regards
>
> KA1MWP
>
> Chuck Partain
>
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Rich Measures, 805.386.3734, AG6K, www.somis.org