[Amps] Output choke - Calculation

[Carl]

The ones used on most amps is 1 to 1.5mH, 100-300ma

Carl
KM1H


----- Original Message ----- 
From: "Roger (K8RI)" <k8ri at rogerhalstead.com>
To: <amps at contesting.com>
Sent: Thursday, May 17, 2012 4:25 AM
Subject: Re: [Amps] Output choke - Calculation


On 5/17/2012 3:52 AM, Máximo EA1DDO_HK1H wrote:
> Hi all,
>
> Just a quick one.
>
> How to calculate the output choke?
> (I mean, the coil at antenna output to groud, to install in a homebrew 
> amplifier)
It just needs to be a very high resistance at any operating frequency,
bleed static to ground, and hopefully trip the PS out if the plate
blocking cap goes.
The general consensus is that the old 2.5 mH probably would blow open in
such a case?

> I don´t know if it is frecuency related and/or power related.

Neither.  if you are asking about the power output of the amp.
It should have enough current handling capability to cause the PS to
blow a fuse or shut down in case the blocking caps fail.
I don't think I missed anything.
It's only function in an amp is to get the plate voltage from ever
getting to the coax connector and hence to the antenna if the blocking
caps fail.

73

Roger (K8RI)
How to know how many uH is correct? Any software or table to get the
right value? Thank you 73, Maximo - EA1DDO
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