[ARC5] TCS 50-Ohm Matching Configurations.

[Bob kb8tq]

Hi

You can model the output several ways. Two common ones are  a low Z in series with an inductance or a high Z
in parallel with the inductance. Either way, a cap in series is what’s needed.  The inductance is what matters.

Bob

> On May 11, 2018, at 9:34 AM, Brian Clarke <brianclarke01 at optusnet.com.au> wrote:
> 
> Hello Bob,
> 
> What you describe is Power Transmission and Distribution, not Maximum Power as per the Jacobi theorem. Agreed.
> So, you want the output impedance of the TCS to look like, say, 0.5 Ohm. Putting a capacitor in series is only part of the story.
> 
> 73 de Brian, VK2GCE.
> 
> On Friday, 11 May 2018 11:22 PM, Bob said:
> 
> Hi
> 
> Like most tube radios, the TCS matches the output tube to an antenna load. It only has
> an “output impedance” in a vague sort of way. You don’t want to “match” the load and 
> burn up half the power in the transmitter’s 50 ohm source. You want to deliver as much
> power to the load ( and burn up as little in the transmitter) as possible. 
> 
> The only real way to work out what the matching circuit will do is to take a look at what
> it was designed for. They ran them into electrically short wire antennas. Whatever a short
> wire (whip or horizontal) presents as a load, that was the target. You can match them with
> a capacitor because that is what the “intended” load looked like ….
> 
> Bob
> 
>